WO2010091969A1

WO2010091969A1 - Lily of the valley-type fragrance compositions

Info

Publication number: WO2010091969A1
Application number: PCT/EP2010/051145
Authority: WO
Inventors: Wolfgang Krause; Francis Bocris
Original assignee: Basf Se
Priority date: 2009-02-13
Filing date: 2010-02-01
Publication date: 2010-08-19

Abstract

The present invention relates to perfume compositions of the lily of the valley type comprising a) 2-methyl-3-(3-tert.-butylphenyl)propanal and b) 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol and c) optionally one or more additional fragrance substance(s) and d) optionally one or more diluent(s). The present invention further relates to a method for producing a perfumed product or article as well as perfumed or aromatized articles comprising the fragrance compositions of the present invention.

Description

Lily of the Valley-type Fragrance Compositions

The present invention relates to fragrance compositions of the lily of the valley comprising 2-methyl-3-(3-tert.-butylphenyl)propanal (meta-tert.-butyl-alpha-methyldihydro- cinnamaldehyde) and 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol. The present invention further relates to a method for producing a perfumed product or article as well as perfumed or aromatized articles comprising the fragrance compositions of the present invention.

Lily of the valley- or muguet-type fragrances are widely used and accepted in a large variety of consumer products such as for example detergents of all kind, washing soaps and hygiene and cosmetic products of all kinds. Blends or mixtures of those lily of the valley- or muguet-type fragrances (hereinafter referred to as "fragrance compositions") often contain the synthetic compound 2-methyl-3-(4-tert.-butylphenyl)propanal of formula (I)

also known under the tradenames Lysmeral® (BASF SE), Lilial® (Givaudan SA) and Lilestralis® (Innospec Inc.). Some of those product may also contain the meta- substituted isomer 2-methyl-3-(3-tert.-butylphenyl)propanal (CAS Registry Number 62518-65-4) of formula (II)

In addition to this, mixtures of the two isomers are commercially available under the tradename Mefloral® (Innospec Inc.).

Due to more recent results and concerns about the allergenic and toxicologic potential of para-substituted dihydrocinnamaldehyde derivatives such as, for example, the compound of formula (I), there is a constant need for safe alternatives with fragrance characteristics very similar to those already accepted and expected by the consumer.

EP 0 045 571 relates to process for the production of 3-(meta- or para-alkylphenyl) propanals. More specifically mixtures of meta and para-isomers containing 50 to 97% of the para-isomer of 3-(tert.-butylphenyl)-2-methylpropanal are disclosed. JP 02238097 discloses perfume compositions containing m-tert.-butyl-alpha- methyldihydrocinnamaldehyde (2-methyl-3-(3-tert.-butylphenyl)propanal) with a lily of the valley-tone in a quantity of about 0.1 to 95 wt%, and preferably from about 1 to 20 wt%, based on the total amount of the blended fragrance composition. Exemplary perfume compositions contain m-tert.-butyl-alpha-methyldihydrocinnamaldehyde as such or together with its para-isomer. Furthermore, a process for the preparation of m- tert.-butyl-alpha-methyldihydrocinnamaldehyde starting from meta-tert. -butyl benz- aldehyde is described.

JP 2000-319684 discloses a composition for perfume which contains 3,7-dimethyl-1- octene-3-ol and/or 3, 7-dimethyl-1-octene-3-acetate. An exemplary composition having lilac-like aroma contained among other ingredients 35 w.t.% of m-tertiary-butyl-alpha- methyl dihydrocinnamaldehyde and 5 w.t.% 3,7-dimethyl-1-octene-3-ol.

It was an object of the present invention to provide suitable fragrances or fragrance compositions with similar, preferable exchangeable fragrance characteristics as those of known lily of the valley- or muguet-type fragrances, especially of para-substituted dihydrocinnamaldehyde derivatives such as for example 2-methyl-3-(4-tert- butylphenyl)propanal. The fragrances or fragrance compositions should be readily ac- cessible in technical quantities under economically favorable conditions.

The problem was surprisingly solved by the provision of a fragrance composition comprising

a) 2-methyl-3-(3-tert.-butylphenyl)propanal and b) 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol and c) optionally one or more additional fragrance substance(s) and d) optionally one or more diluent(s).

It was surprisingly found that the fragrance compositions of the present invention are very well suited as replacements for the established lily of the valley- or muguet-type fragrances of the para-substituted dihydrocinnamaldehyde type, especially of 2-methyl- 3-(4-tert.-butylphenyl)propanal of formula (II).

It was furthermore found that the combination of the known fragrances 2-methyl-3-(3- tert.-butylphenyl)propanal and 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol results in an unexpected synergistic effect. It was surprisingly found that the readily available 2- isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol enhances the fragrance characteristics of 2- methyl-3-(3-tert.-butylphenyl)propanal so that only minor amount of the meta- substituted dihydrocinamaldehyde of formula (II) are necessary to evoke an odour very similar to that of its para-substituted isomer of formula (I) (2-methyl-3-(4-tert.- butylphenyl)propanal). The fragrance compositions of the present invention comprise at least organoleptic active quantities of 2-methyl-3-(3-tert.-butylphenyl)propanal of formula (II)

as component a) and at least organoleptically active quantities of 2-isobutyl-4-methyl- tetrahydro-2H-pyran-4-ol (CAS Registry Number 63500-71-0) of formula

as component b).

For the purposes of the present invention the compound 2-methyl-3-(3-tert.- butylphenyl)propanal of formula (II) may, if desired, be used in optically active form or in another preferred embodiment in form of a racemic mixture. The compound 2- isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol of formula (III) may advantageously be used in form of a mixture of the respective diastereomers (cis/trans) both either in optically active or preferably in racemic form. 2-lsobutyl-4-methyl-tetrahydro-2H-pyran-4-ol of formula (III) is commercially available, e.g. under the trade names Florol® (Firmenich SA) and Florosa® (Givaudan SA) in form of diasteromeric mixtures and may be used as such. 2-Methyl-3-(3-tert.-butylphenyl)propanal of formula (II) may be synthesized in pure form, e.g. according to the route as described in JP 02238097 starting from meta- tert. -butyl benzaldehyde

The fragrance compositions of the present invention may also optionally comprise as component or components c) one or more additional fragrance substance(s). The fragrance compositions of the present invention may also optionally comprise as component or components d) one or more diluent(s). Furthermore, the fragrance compositions of the present invention may also optionally comprise further constituents known to those of skill in the art as common ingredients in fragrance compositions.

Examples of additional fragrance substances c) with which the fragrance compositions of the present invention can be combined advantageously can be found for example in S. Arctander, Perfume and Flavor Materials, Vol. I and 11 , Montclair, N. J., 1969, self- published, or in K. Bauer, D. Garbe and H. Surburg, Common Fragrance and Flavor Materials, 4th Edition, Wiley-VCH, Weinheim 2001. The fragrance compositions of the present invention can be combined with one or more individual fragrance substances known to those of skill in the art as additional fragrance substance c) or o as an additional component to be combined or mixed with the finished fragrance composition, comprising but not limited to, for example, fragrances selected from the following groups:

of hydrocarbons, such as, for example, 3-carene; alpha-pinene; beta-pinene; alpha- terpinene; gamma-terpinene; p-cymene; bisabolene; camphene; caryophyllene; cedrene; farnesene; limonene; longifolene; myrcene; ocimene; valencene; (E,Z)-1 ,3,5- undecatriene; styrene; diphenylmethane;

of aliphatic alcohols, such as, for example, hexanol; octanol; 3-octanol; 2,6- dimethylheptan-2-ol; 2-methyl-2-heptanol, 2-methyl-2-octanol; (E)-2-hexenol; (E)- and (Z)-3-hexenol; 1-octen-3-ol; mixture of 3,4,5,6,6-pentamethyl-3/4-hepten-2-ol and 3,5,6,6-tetramethyl-4-methylene heptan-2-ol; (E,Z)-2,6-nonadienol; 3,7-dimethyl-7- methoxyoctan-2-ol; 9-decenol; 10-undecenol; 4-methyl-3-decen-5-ol;

of aliphatic aldehydes and acetals thereof, such as, for example, hexanal; heptanal; octanal; nonanal; decanal; undecanal; dodecanal; tridecanal; 2-methyloctanal; 2- methylnonanal; (E)-2-hexenal; (Z)-4-heptenal; 2,6-dimethyl-5-heptenal; 10-undecenal; (E)-4-decenal; 2-dodecenal; 2,6,10-trimethyl-9-undecenal; 2,6,10-trimethyl-5,9- undecadienal;heptanal diethyl acetal; 1 ,1-dimethoxy-2,2,5-trimethyl-4-hexene; citro- nellyl oxyacetaldehyde; 1-(1-methoxypropoxy)-(E/Z)-3-hexene;

of aliphatic ketones and oximes thereof, such as, for example, 2-heptanone; 2- octanone; 3-octanone; 2-nonanone; 5-methyl-3-heptanone; 5-methyl-3-heptanone oxime; 2,4,4,7-tetramethyl-6-octen-3-one; 6-methyl-5-hepten-2-one;

of aliphatic sulfur-containing compounds, such as, for example, 3-methylthiohexanol; 3- methylthiohexyl acetate; 3-mercaptohexanol; 3-mercaptohexyl acetate; 3- mercaptohexylbutyrate; 3-acetylthiohexyl acetate; l-menthene-8-thiol;

of aliphatic nitriles, such as, for example, 2-nonenenitrile; 2-undecenenitrile; 2- tridecenenitrile; 3,12-tridecadienenitrile; 3,7-dimethyl-2,6-octadienenitrile; 3,7-dimethyl- 6-octenenitrile; 3,7-dimethyl-octanenitrile;

of esters of aliphatic carboxylic acids, such as, for example, (E)- and (Z)-3-hexenyl formate; ethyl acetoacetate; isoamyl acetate; hexyl acetate; 3,5,5-trimethylhexyl acetate; 3-methyl-2-butenyl acetate; (E)-2-hexenyl acetate; (E)- and (Z)-3-hexenyl acetate; octyl acetate; 3-octyl acetate; 1-octen-3-yl acetate; ethyl butyrate; butyl butyrate; isoamyl butyrate; hexyl butyrate; (E)- and (Z)-3-hexenyl isobutyrate; hexyl crotonate; ethyl is- ovalerate; ethyl-2-methylpentanoate; ethyl hexanoate; allyl hexanoate; ethyl hep- tanoate; allyl heptanoate; ethyl octanoate; ethyl-(E,Z)-2,4-decadienoate; methyl-2- octynoate; methyl-2-nonynoate; allyl-2-isoamyloxyacetate; methyl-3,7-dimethyl-2,6- octadienoate; 4-methyl-2-pentyl crotonate;

of acyclic terpene alcohols, such as, for example, citronellol; geraniol; nerol; linalool; lavandulol; nerolidol; farnesol; tetrahydrolinalool; tetrahydrogeraniol; 3,7-dimethyl- octan-1 ,7-diol; 2,6-dimethyl-7-octen-2-ol; 2,6-dimethyloctan-2-ol; 2-methyl-6- methylene-7-octen-2-ol; 2,6-dimethyl-5,7-octadien-2-ol; 2,6-dimethyl-3,5-octadien-2-ol; 3,7-dimethyl-4,6-octadien-3-ol; 3,7-dimethyl-1 ,5,7-octatrien-3-ol; 2,6-dimethyl-2,5,7- octatrien-1-ol; and formates, acetates, propionates, isobutyrates, butyrates, isovaler- ates, pentanoates, hexanoates, crotonates, tiglinates and 3-methyl-2-butenoat.es thereof;

of acyclic terpene aldehydes and ketones, such as, for example, geranial; neral; citron- ellal; 7-hydroxy-3,7-dimethyloctanal; 7-methoxy-3,7-dimethyloctanal; 2,6,10-trimethyl-9- undecenal; geranylacetone; and the dimethyl and diethyl acetals of geranial, neral, 7- hydroxy-3,7-dimethyloctanal;

of cyclic terpene alcohols, such as, for example, menthol; isopulegol; alpha-terpineol; terpinenol-4; menthan-8-ol; menthan-1-ol; menthan-7-ol; borneol; isoborneol; linalool oxide; nopol; cedrol; ambrinol; vetiverol; guaiol; and formates, acetates, propionates, isobutyrates, butyrates, isovalerates, pentanoates, hexanoates, crotonates, tiglinates and 3-methyl-2-butenoat.es thereof;

of cyclic terpene aldehydes and ketones, such as, for example, menthone; isomen- thone; 8-mercaptomenthan-3-one; carvone; camphor; fenchone; alpha-ionone; beta- ionone; alpha-n-methylionone; beta-n-methylionone; alpha-isomethylionone; beta- isomethylionone; alpha-irone; alphadamascone; beta-damascone; beta-damascenone; deltadamascone; gamma-damascone; 1 -(2,4,4-trimethyl-2-cyclohexen-1 -yl)-2-buten-1 - one; 1 ,3,4,6,7,8a-hexahydro-1 ,1 ,5,5-tetramethyl-2H-2,4a-methanonaphthalen-8(5H)- one; 2-methyl-4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2-butenal; nootkatone; dihydro- nootkatone; 4,6,8-megastigmatrien-3-one; alpha-sinensal; beta-sinensal; acetylated cedarwood oil (methyl cedryl ketone);

of cyclic alcohols, such as, for example, 4-tert-butylcyclohexanol; 3,3,5- trimethylcyclohexanol; 3 -isocamphylcyclohexanol; 2,6,9-trimethyl-Z2,Z5,E9- cyclododecatrien-1-ol, 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol;

of cycloaliphatic alcohols, such as, for example, alpha-3,3-trimethyl- cyclohexylmethanol; 1-(4-isopropylcyclohexyl)ethanol; 2-methyl-4-(2,2,3-trimethyl-3- cyclopent-1 -yl)butanol; 2-methyl-4-(2,2,3-trimethyl-3-cyclopent-1 -yl)-2-buten-1 -ol; 2- ethyl-4-(2,2,3-trimethyl-3-cyclopent-1 -yl)-2-buten-1 -ol; 3-methyl-5-(2,2,3-trimethyl-3- cyclopent-1 -yl)-pentan-2-ol; 3-methyl-5-(2,2,3-trimethyl-3-cyclopent-1 -yl)-4-penten-2-ol; 3,3-dimethyl-5-(2,2,3-trimethyl-3-cyclopent-1 -yl)-4-penten-2-ol; 1 -(2,2,6-trimethyl- cyclohexyl)pentan-3-ol; 1 -(2,2,6-trimethylcyclohexyl)hexan-3-ol; 4-isopropyl- cyclohexylmethanol;

of cyclic and cycloaliphatic ethers, such as, for example, cineol; cedryl methyl ether; cyclododecyl methylether; 1 ,1-dimethoxycyclododecane; (ethoxymethoxy)cyclodo- decane; alpha-cedrene epoxide; 3a,6,6,9a-tetramethyldodecahydronaphtho[2,1- b]furan; 3a-ethyl-6,6,9a-trimethyldodecahydronaphtho[2,1-b]furan; 1 ,5,9-trimethyl-13- oxabicyclo[10.1.0]trideca-4,8-diene; rose oxide; 2-(2,4-dimethyl-3-cyclohexen-1-yl)-5- methyl-5-(1 -methylpropyl)-1 ,3-dioxane;

of cyclic and macrocyclic ketones, such as, for example, 4-tert-butylcyclohexanone;

2,2,5-trimethyl-5-pentylcyclopentanone; 2-heptylcyclopentanone; 2-pentylcyclopentan- one; 2-hydroxy-3-methyl-2-cyclopenten-1-one; 3-methyl-cis-2-penten-1-yl-2- cyclopenten-1 -one; 3-methyl-2-pentyl-2-cyclopenten-1 -one; 3-methyl-4- cyclopentadecenone; 3-methyl-5-cyclopentadecenone; 3-methylcyclopentadecanone;

4-(1 -ethoxyvinyl )-3,3,5,5-tetramethylcyclohexanone; 4-tert-pentylcyclohexanone; 5- cyclohexadecen-1-one; 6,7-dihydro-1 ,1 ,2,3,3-pentamethyl-4(5H)-indanone; 8- cyclohexadecen-1-one; 9-cycloheptadecen-1-one; cyclopentadecanone; cyclohexa- decanone;

of cycloaliphatic aldehydes, such as, for example, 2,4-dimethyl-3-cyclohexenecarb- aldehyde; 2-methyl-4-(2,2,6-trimethylcyclohexen-1-yl)-2-butenal; 4-(4-hydroxy-4- methylpentyl)-3-cyclohexenecarbaldehyde; 4-(4-methyl-3-penten-1 -yl)-3-cyclohexene- carbaldehyde;

of cycloaliphatic ketones, such as, for example, 1-(3,3-dimethylcyclohexyl)-4-penten-1- one; 2,2-dimethyl-1 -(2,4-dimethyl-3-cyclohexen-1 -yl)-1 -propanone; 1 -(5,5-dimethyl-1 - cyclohexen-1 -yl)-4-penten-1 -one; 2,3,8,8-tetramethyl-1 ,2,3,4,5,6,7,8-octahydro-2- naphthalenyl methyl ketone; methyl^^J O-trimethyl^^^-cyclododecatrienyl ketone; tert-butyl-(2,4-dimethyl-3-cyclohexen-1 -yl) ketone;

of esters of cyclic alcohols such as, for example, 2-tert-butylcyclohexyl acetate; 4-tert- butylcyclohexyl acetate; 2-tert-pentylcyclohexyl acetate; 4-tert-pentylcyclohexyl acetate; 3,3,5-trimethylcyclohexyl acetate; decahydro-2-naphthyl acetate; 2-cyclopentyl- cyclopentyl crotonate; 3-pentyltetrahydro-2H-pyran-4-yl acetate; decahydro-2,5,5,8a- tetramethyl-2-naphthyl acetate; 4,7-methano-3a,4,5,6,7,7a-hexahydro-5 or 6-indenyl acetate; 4,7-methano-3a,4,5,6,7,7a-hexahydro-5 or 6-indenyl propionate; 4,7-methano- 3a,4,5,6,7,7a-hexahydro-5 or 6-indenyl isobutyrate; 4,7-methanooctahydro-5 or 6- indenyl acetate; of esters of cycloaliphatic alcohols such as, for example, 1 -cyclohexylethyl crotonate;

of esters of cycloaliphatic carboxylic acids, such as, for example, allyl-3-cyclohexyl propionate; allyl cyclohexyloxyacetate; cis- and trans-methyl dihydrojasmonate; cis- and trans-methyl jasmonate; methyl 2-hexyl-3-oxocyclopentanecarboxylate; ethyl-2- ethyl-6,6-dimethyl-2-cyclohexenecarboxylate; ethyl-2,3,6,6-tetramethyl-2- cyclohexenecarboxylate; ethyl-2-methyl-1 ,3-dioxolane-2-acetate;

of araliphatic alcohols, such as, for example, benzyl alcohol; 1-phenylethyl alcohol; 2- phenylethyl alcohol; 3-phenylpropanol; 2-phenylpropanol; 2-phenoxyethanol; 2,2- dimethyl-3-phenylpropanol; 2,2-dimethyl-3-(3-methylphenyl)propanol; 1 ,1 -dimethyl-2- phenylethyl alcohol; 1 ,1-dimethyl-3-phenylpropanol; 1-ethyl-1-methyl-3-phenylpropanol; 2-methyl-5-phenylpentanol; 3-methyl-5-phenylpentanol; 3-phenyl-2-propen-1-ol; 4- methoxybenzylalcohol; 1 -(4-isopropylphenyl)ethanol;

of esters of araliphatic alcohols and aliphatic carboxylic acids, such as, for example, benzyl acetate; benzyl propionate; benzyl isobutyrate; benzyl isovalerate; 2-phenylethyl acetate; 2-phenylethyl propionate; 2-phenylethyl isobutyrate; 2-phenylethyl isovalerate; 1-phenylethyl acetate; alpha-trichloromethylbenzyl acetate; alpha, alpha- dimethylphenylethyl acetate; alpha, alpha-dimethylphenylethyl butyrate; cinnamyl acetate; 2-phenoxyethyl isobutyrate; 4-methoxybenzyl acetate;

of araliphatic ethers, such as, for example, 2-phenylethyl methyl ether; 2-phenylethyl isoamyl ether; 2-phenylethyl-1-ethoxyethyl ether; phenylacetaldehyde dimethyl acetal; phenylacetaldehyde diethyl acetal; hydratropaldehyde dimethyl acetal; phenylacetaldehyde glycerol acetal; 2,4,6-trimethyl-4-phenyl-1 ,3-dioxane; 4,4a,5,9b-tetrahydro- indeno[1 ,2-d]-m-dioxin; 4,4a,5,9b-tetrahydro-2,4-dimethylindeno[1 ,2-d]-m-dioxin;

of aromatic and araliphatic aldehydes, such as, for example, benzaldehyde; phenylacetaldehyde; 3-phenylpropanal; hydratropaldehyde; 3-(3-lsopropyl- phenyl)butanal, 4-methylbenzaldehyde; 4-methylphenylacetaldehyde; 3-(4- ethylphenyl)-2,2-dimethylpropanal; 2-methyl-3-(4-isopropylphenyl)propanal; 2-methyl- 3-(4-isobutylphenyl)propanal; 3-(4-tert-butylphenyl)propanal; cinnamaldehyde; alpha- butylcinnamaldehyde; alpha-amylcinnamaldehyde; silvial; alpha-hexylcinnamaldehyde; 3-methyl-5-phenylpentanal; 4-methoxybenzaldehyde; 4-hydroxy-3- methoxybenzaldehyde; 4-hydroxy-3-ethoxybenzaldehyde; 3,4- methylenedioxybenzaldehyde; 3,4-dimethoxybenzaldehyde; 2-methyl-3-(4- methoxyphenyl)propanal; 2-methyl-3-(4-methylenedioxyphenyl)propanal;

of aromatic and araliphatic ketones, such as, for example, acetophenone; 4- methylacetophenone; 4-methoxyacetophenone; 4-tert-butyl-2,6-dimethylacetophenone; 4-phenyl-2-butanone; 4-(4-hydroxyphenyl)-2-butanone; 1-(2-naphthalenyl)ethanone; 2- benzofuranyl ethanone; (3-methyl-2-benzofuranyl)ethanone; benzophenone; 1 ,1 ,2,3,3,6-hexamethyl-5-indanyl methyl ketone; 6-tert-butyl-1 ,1-dimethyl-4-indanyl methyl ketone; 1-[2,3-dihydro-1 ,1 ,2,6-tetramethyl-3-(1-methylethyl)-1 H-5- indenyl]ethanone; 5',6',7',8'-tetrahydro-3',5',5',6',8',8'-hexamethyl-2-acetonaphthone;

of aromatic and araliphatic carboxylic acids and esters thereof, such as, for example, benzoic acid; phenylacetic acid; methyl benzoate; ethyl benzoate; hexyl benzoate; benzyl benzoate; methyl phenylacetate; ethyl phenylacetate; geranyl phenylacetate; pheuylethyl phenylacetate; methyl cinnamate; ethyl cinnamate; benzyl cinnamate; phenylethyl cinnamate; cinnamyl cinnamate; allyl phenoxyacetate; methyl salicylate; isoamyl salicylate; hexyl salicylate; cyclohexyl salicylate; cis-3-hexenyl salicylate; benzyl salicylate; phenylethyl salicylate; methyl-2,4-dihydroxy-3,6-dimethylbenzoate; ethyl- 3-phenylglycidate; ethyl-3-methyl-3-phenylglycidate;

of nitrogen-containing aromatic compounds, such as, for example, 2,4,6-trinitro-1 ,3- dimethyl-5-tert-butylbenzene; 3,5-dinitro-2,6-dimethyl-4-tert-butylacetophenone; cin- namonitrile; 3-methyl-5-phenyl-2-pentenenitrile; 3-methyl-5-phenyl pentanenitrile; methyl anthranilate; methyl-N-methylanthranilate; Schiff bases of methyl anthranilate with 7-hydroxy-3,7-dimethyloctanal; 2-methyl-3-(4-tert-butylphenyl)propanal or 2,4- dimethyl-S-cyclohexenecarbaldehyde; 6-isopropylquinoline; 6-isobutylquinoline; 6-sec- butylquinoline; 2-(3-phenylpropyl)pyridine; indole; skatole; 2-methoxy-3- isopropylpyrazine; 2-isobutyl-3-methoxypyrazine;

of phenols, phenyl ethers and phenyl esters, such as, for example, estragole; anethole; eugenol; eugenyl, methyl ether; isoeugenol; isoeugenyl methyl ether; thymol; carvacrol; diphenyl ether; beta-naphthyl methyl ether; beta-naphthyl ethyl ether; beta-naphthyl isobutyl ether; 1 ,4-dimethoxybenzene; eugenyl acetate; 2-methoxy-4-methylphenol; 2- ethoxy-5-(1-propenyl)phenol; p-cresyl phenylacetate;

of heterocyclic compounds, such as, for example, 2,5-dimethyl-4-hydroxy-2H-furan-3- one; 2-ethyl-4-hydroxy-5-methyl-2H-furan-3-one; 3-hydroxy-2-methyl-4H-pyran-4- one; 2-ethyl-3-hydroxy-4H-pyran-4-one;

of lactones, such as, for example, 1 ,4-octanolide; 3-methyl- 1.4-octanolide; 1 ,4- nonanolide; 1 ,4-decanolide; 8-decen-1 ,4-olide; 1 ,4-undecanolide; 1 ,4-dodecanolide; 1 ,5-decanolide; 1 ,5-dodecanolide; 4-methyl-1 ,4-decanolide; 1 ,15-pentadecanolide; cis- and trans-1 1 -pentadecen-1 ,15-olide; cis- and trans-12-pentadecen-1 ,15-olide;1 ,16- hexadecanolide; 9-hexadecen-1 ,16-olide; 10-oxa-1 ,16-hexadecanolide; 1 1-oxa-1 ,16- hexadecanolide; 12-oxa-1 ,16-hexadecanolide; ethylene-1 ,12-dodecanedioate; ethyl- ene-1 ,13-tridecanedioate; coumarin; 2,3-dihydrocoumarin; octahydrocoumarin. Preferred fragrance substances c) according to the present invention are those, selected from the group of fragrance compounds consisting of 7-hydroxy-3,7- dimethyloctanal; 3,7-dimethyl-octan-1 ,7-diol; 4-isopropyl-cyclohexylmethanol; limo- nene; hexanol; octanol; 3-octanol; 2,6-dimethylheptan-2-ol; 2-methyl-2-heptanol; 2- methyl-2-octanol; (E)-2-hexenol; (E)- and (Z)-3-hexenol; 3,7-dimethyl-6-octenenitrile; 3,7-dimethyl-octanenitrile; (E)- and (Z)-3-hexenyl formate; (E)- and (Z)-3-hexenyl acetate; octyl acetate; citronellol; geraniol; nerol; linalool; lavandulol; nerolidol; farnesol; tetrahydrolinalool; tetrahydrogeraniol; 2,6-dimethyl-7-octen-2-ol; 2,6-dimethyloctan-2-ol; 2-methyl-6-methylene-7-octen-2-ol; 2,6-dimethyl-5,7-octadien-2-ol; 2,6-dimethyl-3,5- octadien-2-ol; 3,7-dimethyl-4,6-octadien-3-ol; 3,7-dimethyl-1 ,5,7-octatrien-3-ol; 2,6- dimethyl-2,5,7-octatrien-1-ol; geranial; neral; citronellal; 7-methoxy-3,7-dimethyloctanal; 2,6,10-trimethyl-9-undecenal; geranylacetone; and the dimethyl and diethyl acetals of geranial, neral, 7-hydroxy-3,7-dimethyloctanal; menthol; isopulegol; alpha-terpineol; terpinenol-4; menthan-8-ol; menthan-1-ol; menthan-7-ol; borneol; isoborneol; linalool oxide; nopol; cedrol; ambrinol; vetiverol; guaiol; and formates, acetates, propionates, isobutyrates, butyrates, isovalerates, pentanoates, hexanoates, crotonates, tiglinates and 3-methyl-2-butenoat.es thereof; menthone; carvone; camphor; fenchone; alpha- ionone; beta-ionone; alpha-n-methylionone; beta-n-methylionone; alpha- isomethylionone; beta-isomethylionone; alpha-irone; alpha-damascone; beta- damascone; beta-damascenone; delta-damascone; gamma-damascone; 1 -(2,4,4- trimethyl-2-cyclohexen-1-yl)-2-buten-1-one; 1 , 3, 4,6,7, 8a-hexahydro-1 , 1 ,5,5- tetramethyl-2H-2,4a-methanonaphthalen-8(5H)-one; 2-methyl-4-(2,6,6-trimethyl-1- cyclohexen-1-yl)-2-butenal; nootkatone; dihydro-nootkatone; 4,6,8-megastigmatrien-3- one; alpha-sinensal; beta-sinensal; acetylated cedarwood oil (methyl cedryl ketone); 4- tert-butylcyclohexanol; 3,3,5-trimethylcyclohexanol; 3 -isocamphylcyclohexanol; alpha- 3,3-trimethyl-cyclohexylmethanol; 1 -(4-isopropylcyclohexyl)ethanol; 2-methyl-4-(2,2,3- trimethyl-3-cyclopent-1 -yl)butanol; 2-methyl-4-(2,2,3-trimethyl-3-cyclopent-1 -yl)-2- buten-1-ol; 2-ethyl-4-(2,2,3-trimethyl-3-cyclopent-1-yl)-2-buten-1-ol; 3-methyl-5-(2,2,3- trimethyl-3-cyclopent-1 -yl)-pentan-2-ol; 3-methyl-5-(2,2,3-trimethyl-3-cyclopent-1 -yl)-4- penten-2-ol; 3,3-dimethyl-5-(2,2,3-trimethyl-3-cyclopent-1-yl)-4-penten-2-ol; 1 -(2,2,6- trimethyl-cyclohexyl)pentan-3-ol; 1 -(2,2,6-trimethylcyclohexyl)hexan-3-ol; 4-tert- butylcyclohexanone; 2,2,5-trimethyl-5-pentylcyclopentanone; 2-heptylcyclopentanone; 2-pentylcyclopentan-one; 2-hydroxy-3-methyl-2-cyclopenten-1 -one; 3-methyl-cis-2- penten-1 -yl-2-cyclopenten-1 -one; 3-methyl-2-pentyl-2-cyclopenten-1 -one; 3-methyl-4- cyclopentadecenone; 3-methyl-5-cyclopentadecenone; 3-methylcyclopentadecanone; 4-(1 -ethoxyvinyl )-3,3,5,5-tetramethylcyclohexanone; 4-tert-pentylcyclohexanone; 5- cyclohexadecen-1-one; 6,7-dihydro-1 ,1 ,2,3,3-pentamethyl-4(5H)-indanone; 8- cyclohexadecen-1-one; 9-cycloheptadecen-1-one; cyclopentadecanone; cyclohexa- decanone; 2,4-dimethyl-3-cyclohexenecarb-aldehyde; 2-methyl-4-(2,2,6- trimethylcyclohexen-1 -yl)-2-butenal; 4-(4-hydroxy-4-methylpentyl)-3- cyclohexenecarbaldehyde; 4-(4-methyl-3-penten-1 -yl)-3-cyclohexene-carbaldehyde; 1 - (3,3-dimethylcyclohexyl)-4-penten-1 -one; 2,2-dimethyl-1 -(2,4-dimethyl-3-cyclohexen-1 - yl)-1 -propanone; 1 -(5,5-dimethyl-1 -cyclohexen-1 -yl)-4-penten-1 -one; 2,3,8,8- tetramethyl-1 , 2, 3,4,5,6, 7,8-octahydro-2-naphthalenyl methyl ketone; methyl-2,6,10- trimethyl-2,5,9-cyclododecatrienyl ketone; tert-butyl-(2,4-dimethyl-3-cyclohexen-1 -yl) ketone; 2-tert-butylcyclohexyl acetate; 4-tert-butylcyclohexyl acetate; 2-tert- pentylcyclohexyl acetate; 4-tert-pentylcyclohexyl acetate; 3,3,5-trimethylcyclohexyl acetate; decahydro-2-naphthyl acetate; 2-cyclopentyl-cyclopentyl crotonate; 3- pentyltetrahydro-2H-pyran-4-yl acetate; decahydro-2,5,5,8a-tetramethyl-2-naphthyl acetate; 4,7-methano-3a,4,5,6,7,7a-hexahydro-5 or 6-indenyl acetate; 4,7-methano- 3a,4,5,6,7,7a-hexahydro-5 or 6-indenyl propionate; 4,7-methano-3a,4,5,6,7,7a- hexahydro-5 or 6-indenyl isobutyrate; 4,7-methanooctahydro-5 or 6-indenyl acetate; benzyl alcohol; 1-phenylethyl alcohol; 2-phenylethyl alcohol; 3-phenylpropanol; 2- phenylpropanol; 2-phenoxyethanol; 2,2-dimethyl-3-phenylpropanol; 2,2-dimethyl-3-(3- methylphenyl)propanol; 1 ,1 -dimethyl-2-phenylethyl alcohol; 1 ,1-dimethyl-3- phenylpropanol; 1-ethyl-1-methyl-3-phenylpropanol; 2-methyl-5-phenylpentanol; 3- methyl-5-phenylpentanol; 3-phenyl-2-propen-1-ol; 4-methoxybenzylalcohol; 1-(4- isopropylphenyl)ethanol; benzyl acetate; benzyl propionate; benzyl isobutyrate; benzyl isovalerate; 2-phenylethyl acetate; 2-phenylethyl propionate; benzaldehyde; phenylacetaldehyde; 3-phenylpropanal; hydratropaldehyde; 4-methylbenzaldehyde; 4- methylphenylacetaldehyde; 3-(4-ethylphenyl)-2,2-dimethylpropanal; 2-methyl-3-(4- isopropylphenyl)propanal; 2-methyl-3-(4-isobutylphenyl)propanal; 3-(4-tert- butylphenyl)propanal; cinnamaldehyde; alpha-butylcinnamaldehyde; alpha- amylcinnamaldehyde; alpha-hexylcinnamaldehyde; 3-methyl-5-phenylpentanal; 4- methoxybenzaldehyde; 4-hydroxy-3-methoxybenzaldehyde; 4-hydroxy-3- ethoxybenzaldehyde; 3,4-methylenedioxybenzaldehyde; 3,4-dimethoxybenzaldehyde; 2-methyl-3-(4-methoxyphenyl)propanal; 2-methyl-3-(4-methylenedioxyphenyl)propanal; acetophenone; 4-methylacetophenone; 4-methoxyacetophenone; 4-tert-butyl-2,6- dimethylacetophenone; 4-phenyl-2-butanone; 4-(4-hydroxyphenyl)-2-butanone; 1-(2- naphthalenyl)ethanone; 2-benzofuranyl ethanone; (3-methyl-2-benzofuranyl)ethanone; benzophenone; 1 ,1 ,2,3,3,6-hexamethyl-5-indanyl methyl ketone; 6-tert-butyl-1 ,1- dimethyl-4-indanyl methyl ketone; 1-[2,3-dihydro-1 ,1 ,2,6-tetramethyl-3-(1-methylethyl)- 1 H-5-indenyl]ethanone; estragole; anethole; eugenol; iso-eugenol; thymol; 1 ,4- octanolide; 3-methyl- 1.4-octanolide; 1 ,4-nonanolide; 1 ,4-decanolide; 8-decen-1 ,4- olide; 1 ,4-undecanolide; 1 ,4-dodecanolide; 1 ,5-decanolide; 1 ,5-dodecanolide; 4-methyl- 1 ,4-decanolide; 1 ,15-pentadecanolide; cis- and trans- 1 1 -pentadecen-1 ,15-olide; cis- and trans-12-pentadecen-1 ,15-olide;1 ,16-hexadecanolide; 9-hexadecen-1 ,16-olide; 10-oxa-1 ,16-hexadecanolide; 11 -oxa-1 ,16-hexadecanolide; 12-oxa-1 ,16- hexadecanolide; ethylene-1 ,12-dodecanedioate; ethylene-1 ,13-tridecanedioate; cou- marin; 2,3-dihydrocoumarin and octahydrocoumarin.

In a preferred embodiment the fragrance compositions of the present invention comprise diastereomers of 2-isobutyl-4-methyl-tetradydro-2H-pyran-4-ol of formula (III) with at least 70% of the cis form. In a more preferred embodiment the fragrance composi- tions of the present invention comprise diastereomers of 2-isobutyl-4-methyl- tetrahydro-2H-pyran-4-ol of formula (III) having 70-80% of the cis form and 30-20% of the trans form.

In a preferred embodiment the fragrance compositions of the present invention comprise one or more, usually 1 to 20, preferably 1 to 10, more preferably 1 to 8, more preferably 1 to 6, more preferably 1 to 5, more preferably 1 to 4, even more preferably 1 to 3 and most preferably 1 or 2 additional fragrance substances selected from the group of fragrance listed above, whereas the fragrance substances 7-hydroxy-3,7- dimethyloctanal, 2,6-dimethylheptan-2-ol, 3,7-dimethyl-octan-1 ,7-diol and 4-isopropyl- cyclohexylmethanol are particularly preferred fragrance substances c) comprised by the fragrance compositions of the present invention.

Particularly preferred fragrance compositions in one embodiment of the present inven- tion are those comprising 7-hydroxy-3,7-dimethyloctanal (Hydroxycitronellal, CAS Registry Number 107-75-5) of formula (IV)

as additional fragrance substance c).

Further particularly preferred fragrance compositions of the present invention are those comprising 4-isopropyl-cyclohexylmethanol (4-(1 -methylethyl)-cyclohexanemethanol, CAS Registry Number 13828-37-0) of formula (V)

as additional fragrance substance c). The compounds 7-hydroxy-3,7-dimethyloctanal of formula (IV) and 4-isopropyl-cyclohexylmethanol of formula (V) are known and com- mercially widely available e.g. as Mayol® (Firmenich SA), Meijiff ™ (International Flavors & Fragrances Inc.) or may be synthesized by known methods.

Further particularly preferred fragrance compositions of the present invention are those comprising 2,6-dimethylheptan-2-ol (CAS Registry Number 13254-34-7) of formula (Vl)

(Vl) as additional fragrance substance c).

Further particularly preferred fragrance compositions of the present invention are those comprising 3,7-dimethyl-octan-1 ,7-diol (Hydroxycitronellol; CAS Registry Number 107- 74-4) of formula (VII)

as additional fragrance substance c).

In a particularly preferred embodiment the fragrance compositions of the present invention comprise or consist of the components a) 2-methyl-3-(3-tert.-butylphenyl)propanal and b) 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol and c) 7-hydroxy-3,7-dimethyloctanal and/or 4-isopropyl-cyclohexylmethanol and optionally one or more additional fragrance substance(s) and d) optionally one or more diluent(s).

In another preferred embodiment the fragrance compositions of the present invention comprise or consist of the components a) 2-methyl-3-(3-tert.-butylphenyl)propanal and b) 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol and c) 7-hydroxy-3,7-dimethyloctanal and 4-isopropyl-cyclohexylmethanol and optionally one or more additional fragrance substance(s) and d) optionally one or more diluent(s).

In yet another more preferred embodiment the fragrance compositions of the present invention comprise or consist of the components a) 2-methyl-3-(3-tert.-butylphenyl)propanal and b) 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol and c) 7-hydroxy-3,7-dimethyloctanal and optionally one or more additional fragrance substance(s) and d) optionally one or more diluent(s).

In yet another even more preferred embodiment the fragrance compositions of the present invention comprise or consist of the components a) 2-methyl-3-(3-tert.-butylphenyl)propanal and b) 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol and c) 7-hydroxy-3,7-dimethyloctanal and 3,7-dimethyl-octan-1 ,7-diol and optionally one or more additional fragrance substance(s) and d) optionally one or more diluent(s).

In yet another preferred embodiment the fragrance compositions of the present invention comprise or consist of the components a) 2-methyl-3-(3-tert.-butylphenyl)propanal and b) 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol and c) 7-hydroxy-3,7-dimethyloctanal and 2,6-dimethylheptan-2-ol and optionally one or more additional fragrance substance(s) and d) optionally one or more diluent(s).

In yet another preferred embodiment the fragrance compositions of the present inven- tion comprise or consist of the components a) 2-methyl-3-(3-tert.-butylphenyl)propanal and b) 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol as mixture of diastereomers (cis/trans is 70-80/30-20) and c) 2,6-dimethylheptan-2-ol and optionally one or more additional fragrance sub- stance(s) and d) optionally one or more diluent(s).

For the purposes of the above-mentioned preferred embodiments the term "additional fragrance substances" means one or more, usually 1 to 20, preferably 1 to 10, more preferably 1 to 8, more preferably 1 to 6, more preferably 1 to 5, more preferably 1 to 4, even more preferably 1 to 3 and most preferably 1 or 2 additional fragrance substances selected from the group of fragrance substances c) listed above other than 7-hydroxy- 3,7-dimethyloctanal and 4-isopropyl-cyclohexylmethanol.

In the fragrance compositions according to the present invention the weight-based ratio of the total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal to the total amount of 2- isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol may generally be varied within a broad range. Preferably the weight-based ratio of the total amount of 2-methyl-3-(3-tert.- butylphenyl)propanal to the total amount of 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4- ol in the finished fragrance composition ranges from about 1 :1 to about 1 :100, more preferably from 1 :2 to 1 :50, more preferably from 1 :3 to 1 :30, more preferably from 1 :4 to 1 :20, more preferably from 1 :5 to 1 :20 and most preferably from 1 :7,5 to 1 :15.

In the preferred fragrance compositions according to the present invention comprising 2,6-dimethylheptan-2-ol as additional fragrance substance the weight-based ratio of the total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal to the total amount of 2,6- dimethylheptan-2-ol may also generally be varied within a broad range. Preferably the weight-based ratio of the total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal to the total amount of 2,6-dimethylheptan-2-ol in the finished fragrance composition ranges from about 20:1 to about 1 :1 , more preferably from 15:1 to 1 :1 , more preferably from 10:1 to 1 :1 , and most preferably from 5:1 to 1 :1.

In the preferred fragrance compositions according to the present invention comprising 3,7-dimethyl-octan-1 ,7-diol as additional fragrance substance the weight-based ratio of the total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal to the total amount of 3,7- dimethyl-octan-1 ,7-diol may also generally be varied within a broad range. Preferably the weight-based ratio of the total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal to the total amount of 3,7-dimethyl-octan-1 ,7-diol in the finished fragrance composition ranges from about 1 :20 to about 1 :1 , more preferably from 10:1 to 1 :1 , more preferably from 7:1 to 1 :1 , and most preferably from 5:1 to 1 :1.

In the preferred fragrance compositions according to the present invention comprising 7-hydroxy-3,7-dimethyloctanal as additional fragrance substance c) the weight-based ratio of the total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal to the total amount of 7-hydroxy-3,7-dimethyloctanal may also generally be varied within a broad range. Preferably the weight-based ratio of the total amount of 2-methyl-3-(3-tert- butylphenyl)propanal to the total amount of 7-hydroxy-3,7-dimethyloctanal in the finished fragrance composition ranges from about 10:1 to about 1 :10, more preferably from 7,5:1 to 1 :7,5, more preferably from 5:1 to 1 :5 and most preferably from 2,5:1 to 1 :2,5.

In the preferred fragrance compositions according to the present invention comprising 4-isopropyl-cyclohexylmethanol as additional fragrance substance c) the weight-based ratio of the total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal to the total amount of 4-isopropyl-cyclohexylmethanol may also generally be varied within a broad range. Preferably the weight-based ratio of the total amount of 2-methyl-3-(3-tert.- butylphenyl)propanal to the total amount of 4-isopropyl-cyclohexylmethanol in the finished fragrance composition ranges from about 10:1 to about 1 :1 , more preferably from 7,5:1 to 1 :1 , more preferably from 5:1 to 1 :1 , more preferably from 2,5:1 to 1 :1 and most preferably from 2:1 to 1 :1.

The fragrance composition according to the present invention comprise at least or- ganoleptically active quantities of the named ingredients 2-methyl-3-(3-tert.- butylphenyl)propanal and 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol and, if present, of the optional further fragrance substances 7-hydroxy-3,7-dimethyloctanal and/or 4- isopropyl-cyclohexylmethanol and, if present of the optional further fragrance sub- stances, preferably 2, 6-dimethylheptan-2-ol and/or 3,7-dimethyl-octan-1 ,7-diol. The term "organoleptically active amount" as used herein means an amount sufficient to stimulate an olfactorial impression in a human being, especially the olfactorial impression of a typical lily of the valley- or muguet-type scent.

In the case of the fragrance substances of the present invention, especially in the case of 2-methyl-3-(3-tert.-butylphenyl)propanal and 2-isobutyl-4-methyl-tetrahydro-2H- pyran-4-ol and 7-hydroxy-3,7-dimethyloctanal and 4-isopropyl-cyclohexylmethanol generally only minor amounts or concentrations are necessary to generate the desired lily of the valley- or muguet-type fragrance.

The absolute content of the named ingredients 2-methyl-3-(3-tert.-butylphenyl)propanal and 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol and, if present, of the optional further fragrance substances 7-hydroxy-3,7-dimethyloctanal and/or 4-isopropyl-cyclohexylmethanol and, if present of the optional further fragrance substances, preferably 2,6- dimethylheptan-2-ol and 3,7-dimethyl-octan-1 ,7-diol, in the fragrance compositions of the present invention, based on the total amount of the fragrance composition, may be varied within broad ranges.

Preferred compositions of the present invention comprise or consist of, based on the total amount of the finished composition, a total amount of 2-methyl-3-(3-tert.- butylphenyl)propanal in the range from about 0,1 to 50 wt.%, preferably from 0,1 to 30 wt. %, more preferably from 0,1 to 20 wt.%, more preferably from 0,1 to 15 wt.%, more preferably from 0,2 to 10 wt.%, even more preferably from 0,5 to 10 wt.% and most preferably in the range from 1 to 5 wt.%.

Preferred compositions of the present invention comprise or consist of, based on the total amount of the finished composition, a total amount of 2-isobutyl-4-methyl- tetrahydro-2H-pyran-4-ol in the range from about 0,1 to 90 wt.%, preferably from 1 to 70 wt.%, more preferably from 5 to 50 wt.%, more preferably from 10 to 50 wt.%, even more preferably from 10 to 40 wt.% and most preferably in the range from 20 to 30 wt.%.

Those preferred compositions of the present invention comprising 7-hydroxy-3,7- dimethyloctanal comprise or consist of, based on the total amount of the finished composition, a total amount of 7-hydroxy-3,7-dimethyloctanal in the range of up to 30 wt.%, preferably from 0,1 to 30 wt.%, more preferably from 0,5 to 25 wt.%, more preferably from 1 to 20 wt.%, even more preferably from 1 to 10 wt.% and most preferably in the range from 2 to 4 wt.%.

In many cases only small amounts of 4-isopropyl-cyclohexylmethanol, if at all, are nec- essary to optimize the desired lily of the valley- or muguet-type scent of the fragrance compositions of the present invention into direction of identity with Lysmeral®. Those preferred compositions of the present invention comprising 4-isopropyl- cyclohexylmethanol comprise or consist of, based on the total amount of the finished composition, a total amount of 4-isopropyl-cyclohexylmethanol in the range of up to 30 wt. %, preferably from 0,01 to 30 wt.%, more preferably from 0,1 to 20 wt.%, more preferably from 0,1 to 10 wt.%, even more preferably from 0,1 to 5 wt.% and most pref- erably in the range from 0,1 to 2,5 or even to 1 wt.%.

The perfume compositions of the present invention do preferably not contain significant amounts of 2-methyl-3-(4-tert.-butylphenyl)propanal (the para-substituted compound of formula (I)). Preferably the weight-based ratio of 2-methyl-3-(3-tert. - butylphenyl)propanal to 2-methyl-3-(4-tert.-butylphenyl)propanal, if present at all, in the finished perfume composition ranges from over 10000:1 or higher to 50:1 , preferably from 10000:1 to 100:1.

In a particularly preferred embodiment the fragrance compositions of the present inven- tion comprise, based on the total amount of the finished composition, a total amount of 2-methyl-3-(4-tert.-butylphenyl)propanal of 1 wt.% or less, preferably of 0,5 wt.% or less, more preferably of 0,1 wt.% or less, more preferably of 0,05 wt.% or less and most preferably of 0,01 wt.% or less. In a even more preferred embodiment the fragrance compositions of the present invention are substantially free of 2-methyl-3-(4- tert.-butylphenyl)propanal of formula (I), meaning that it comprises based on the total amount of the finished composition, a total amount of 2-methyl-3-(4-tert.-butylphenyl) propanal of 0,005 wt.% or less, preferably of 0,001 wt.% or less.

The fragrance compositions of the present invention may optionally comprise as com- ponent d) one or more diluent(s). The expression "one or more diluent(s)" means that one diluent or a mixture of two or more diluents may be present in fragrance compositions. The term "diluent" means a substance known to those of skill in the art as a suiable solvent for perfume or fragrance compositions such as, e.g. an alcohol such as ethanol or isopropanol and/or a polyol or an ether derived thereof such as diethylene glycol monoethyl ether, glycerol, propylene glycol, 1 ,2-butylene glycol, dipropylene glycol, diethyl phthalate, triethyl citrate, isopropyl myristate, dialkyl esters of 1 ,2- cyclohexanedicarboxylic acid, especially 1 ,2-cyclohexanedicarboxylic acid diisononyl ester (Hexamoll® DINCH, BASF SE) or and the like. Therefore, particularly preferred fragrance compositions according to the present invention comprise one or more dilu- ent(s) d) selected from the group consisting of diethylene glycol monoethyl ether, glycerol, propylene glycol, 1 ,2-butylene glycol, dipropylene glycol, diethyl phthalate, triethyl citrate, isopropyl myristate and dialkyl esters of 1 ,2-cyclohexanedicarboxylic acid, especially 1 ,2-cyclohexanedicarboxylic acid diisononyl ester.

The components of the fragrance compositions according to the present invention, namely 2-methyl-3-(3-tert.-butylphenyl)propanal and 2-isobutyl-4-methyl-tetrahydro-2H- pyran-4-ol and, if present, of the optional further fragrance substances 7-hydroxy-3,7- dimethyloctanal and/or 4-isopropyl-cyclohexylmethanol and, if present other optional further fragrance substances, preferably 2, 6-dimethylheptan-2-ol and/or 3, 7-dimethyl- octan-1 ,7-diol as well as the diluent(s), if present, may be blended or mixed by conventional techniques known to those of skill in the art.

Exemplary fragrance compositions according to the present invention may comprise, based on the total amount of the composition, e.g.:

2-Methyl-3-(3-tert.-butylphenyl)propanal: 1 - 20 wt.% 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol: 10 - 69 wt.%

7-Hydroxy-3,7-dimethyloctanal: 0 - 10 wt.%

4-lsopropyl-cyclohexylmethanol : 0 - 1 wt.%

Diluent: 0 - 89 wt.%

or more preferred:

2-Methyl-3-(3-tert.-butylphenyl)propanal: 1 - 5 wt.%

2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol: 10 - 50 wt.%

7-Hydroxy-3,7-dimethyloctanal: 1 - 10 wt.% 4-lsopropyl-cyclohexylmethanol : 0 - 1 wt.%

Diluent: 34 - 88 wt.%

or even more preferred:

2-Methyl-3-(3-tert.-butylphenyl)propanal: 2 - 3 wt.%

2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol: 20 - 30 wt.%

7-Hydroxy-3,7-dimethyloctanal: 2 - 7 wt.%

4-lsopropyl-cyclohexylmethanol : 0 - 1 wt.%

Diluent: 59 - 76 wt.%.

Particularly preferred fragrance compositions according to the present invention may comprise, based on the total amount of the composition, e.g.

2-Methyl-3-(3-tert.-butylphenyl)propanal: 1 - 5 wt.% 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol: 10 - 50 wt.%

7-Hydroxy-3,7-dimethyloctanal: 1 - 10 wt.%

2,6-dimethylheptan-2-ol 0 - 2 wt.%

3,7-dimethyl-octan-1 ,7-diol 5 - 50 wt.%

4-lsopropyl-cyclohexylmethanol : 0 - 1 wt.% Diluent: 34 - 88 wt.%

or even more preferred 2-Methyl-3-(3-tert.-butylphenyl)propanal: 1 - 5 wt.% 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol: 10 - 30 wt.%

7-Hydroxy-3,7-dimethyloctanal: 2 - 7 wt.% 2,6-dimethylheptan-2-ol 0 - 1 wt.%

3,7-dimethyl-octan-1 ,7-diol 5 - 25 wt.%

4-lsopropyl-cyclohexylmethanol : 0 - 1 wt.%

Diluent: 34 - 88 wt.%

The fragrance compositions of the present invention can also be combined with extracts of natural raw materials such as essential oils, concretes, absolutes, resins, resi- noids, balsams, tinctures and the like known to those of skill in the art, comprising but not limited to, for example:

Ambergris tincture; amyris oil; angelica seed oil; angelica root oil; aniseed oil; valerian oil; basil oil; treemoss absolute; bay oil; mugwort oil; benzoin resin; bergamot oil; beeswax absolute; birch tar oil; bitter almond oil; savory oil; buchu leaf oil; cabreuva oil; cade oil; calamus oil; camphor oil; cananga oil; cardamom oil; cascarilla oil; cassia oil; cassie absolute; castoreum absolute; cedar leaf oil; cedarwood oil; cistus oil; citronella oil; citrus oil; copaiba balsam; copaiba balsam oil; coriander oil; costus root oil; cumin oil; cypress oil; davana oil; dill weed oil; dill seed oil; eau de brouts absolute; oakmoss absolute; elemi oil; tarragon oil; eucalyptus citriodora oil; eucalyptus oil; fennel oil; spruce needle oil; galbanum oil; galbanum resin; geranium oil; grapefruit oil; guaiac wood oil; gurjun balsam; gurjun balsam oil; helichrysum absolute; helichrysum oil; ginger oil; iris root absolute; iris root oil; jasmine absolute; calamus oil; camomile blue oil; camomile Roman oil; carrot seed oil; cascarilla oil; pine needle oil; spearmint oil; caraway oil; labdanum oil; labdanum absolute; labdanum resin; lavandin absolute; lavandin oil; lavender absolute; lavender oil; lemongrass oil; lovage oil; distilled lime oil; pressed lime oil; linaloe oil; litsea cubeba oil; bayleaf oil; mace oil; marjoram oil; mandarin oil; massoi bark oil; mimosa absolute; musk seed oil; musk tincture; clary sage oil; nutmeg oil; myrrh absolute; myrrh oil; myrtle oil; clove leaf oil; clove flower oil; neroli oil; oliba- num absolute; olibanum oil; opopanax oil; orange flower absolute; orange oil; origanum oil; palmarosa oil; patchouli oil; perilla oil; Peru balsam oil; parsley leaf oil; parsley seed oil; petitgrain oil; peppermint oil; pepper oil; pimento oil; pine oil; pennyroyal oil; rose absolute; rosewood oil; rose oil; rosemary oil; Dalmatian sage oil; Spanish sage oil; sandalwood oil; celery seed oil; spike lavender oil; star anise oil; styrax oil; tagetes oil; fir needle oil; tea-tree oil; turpentine oil; thyme oil; tolu balsam; tonka absolute; tube- rose absolute; vanilla extract; violet leaf absolute; verbena oil; vetiver oil; juniper beny oil; cognac oil; wormwood oil; wintergreen oil; ylang-ylang oil; hyssop oil; civet abso- lute; cinnamon leaf oil; cinnamon bark oil and fractions thereof, or ingredients isolated therefrom.

The fragrance compositions of the present invention can also be combined with anti- oxidants (stabilizers) known to those of skill in the art, comprising but not limited to, for example:

phenolic antioxidants such as sodium salicylate, 2,4-dihydroxybenzophenone, 2,6-di-t- butyl-p-cresol, butylated hydroxyanisole (BHA), 2,6-di-t-butyl-4-methylphenol (BHT), 2,6-di-t-butyl-4-ethylphenol, stearyl-fl-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, propyl 3,4,5-trihydroxybenzoate, hydroquinone, and catechol;

bisphenolic antioxidants such as 2,2'-methylenebis(4-methyl-6-t-butylphenol), 2,2'- methylenebis(4-ethyl-6-t-butylphenol), 4,4'-thiobis(3-methyl-6-t-butylphenol), 4,4'- butylidenebis(3-methyl-6-t-butylpheol) 3,9-bis[l,l-dimethyl-2-[fl-(3-t-butyl-4-hydroxy-5- methylphenyl)propionyloxy]ethyl]2,4,8,IO-tetraoxaspyrro[5,5]undecane, and 4,4'-(2,3- dimethyltetramethylene)dipyrrocatechol;

high-molecular phenolic antioxidants such as 1 ,1 ,3-tris(2-methyl-4-hydroxy-5-t- butylphenyl)butane, 1 ,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl) benzene, tetrakis-[methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl)propionate]methane, bis[3,3'- bis-(4'-hydroxy-3'-t-butylpheny1 )butyric acid]glycol ester, 1 ,3,5-tris(3',5'-di-t-butyl-4'- hydroxybenzyl)-s-triazine-2,4,6-(1 H,3H,5H)trione, and alpha-tocopherol; tocotrienols and their esters;

alcoholic antioxidants such as erythorbic acid, sodium erythorbat and isopropyl citrate; as well as ascorbic acid and its esters, especially ascorbyl palmitate;

and other anti-oxidants such as N-aspartylphenylalanin alkyl ester, eugenol oi- soeugenol, quercetin7,4-dimethoxy-5-hydroxy-flavone, gallic acid, chlorogenic acid, dihydro-norguajaretic acid (NDGA), caffeic acid.

Further, the fragrance compositions of the present invention may contain the usual amounts of fixatives known to those of skill in the art. Preferred fixative for the use in the fragrance compositions of the present invention include but are not limited to sandalwood, ambra products, polycyclic, macrocyclic and alicyclic substances like Am- brox® (Firmenich SA), Galaxolide® (Int. Flavors & Fragrances Inc.), Tonalide, Exalto- lide® (Firmenich SA), Habanolide® (Firmenich SA) und Helvetolide® (Firmenich SA).

The fragrance compositions of the present invention can also comprise encapsulating substances like cyclodextrines; chelating and complexing agents like EDTA or citric acid. The fragrance compositions of the present invention may advantageously used for em- parting and/or enhancing an odor or flavor of a product or article of all kind with a lily of the valley- or muguet-type note or with a syringa-type note, a magnolia-type note, a cyclamen-type note or a hyacinth-type note, preferably with a lily of the valley- or muguet-type note. A further embodiment of the present invention therefore relates to a method for emparting and/or enhancing an odor or flavor of a product or article with a lily of the valley- or muguet-type note or with a syringa-type note, a magnolia-type note, a cyclamen-type note, a hyacinth-type note or a lilac-type note, preferably with a lily of the valley- or muguet-type note, comprising bringing into contact or mixing with or adding to said product or article an organoleptically active quantity of a fragrance composition according to the present invention whereas the term "organoleptically active quantity" has the meaning as defined above. The fragrance compositions of the present invention may be used or applied in every suited form e.g. in pure form or in form of dilutions or mixtures as well as in microencapsulated form.

Therefore, a further embodiment of the present invention relates to a method for producing a perfumed product or article comprising bringing into contact or mixing with or adding to said product or article an organoleptically active quantity of the fragrance composition according to the present invention.

In yet a further embodiment the present invention relates to a perfumed or aromatized product or article comprising an organoleptically active quantity of the fragrance composition according to the present invention as hereinbefore described. The perfumed or aromatized articles or products accessible by the present invention may be a perfumed or aromatized article of manufacture of all kind. Preferred aromatized or perfumed articles or products comprise, but are not limited to, e.g. perfumes, detergents and washing soaps, both liquid and solid and toilet articles of all kinds. Preferred perfumed or aromatized articles according to the present invention are selected from the group con- sisting of extracts, eaux de parfum, eaux de toilette, after-shave lotions, eaux de Cologne, pre-shave products, splash colognes, perfumed refreshing tissues, acidic, alkaline and neutral cleaning products, textile fresheners, ironing aids, liquid detergents, powder detergents, fabric preconditioners, fabric softeners, washing soaps, washing tablets, disinfectants, surface disinfectants, air purifiers, aerosol sprays, waxes and polishes, body care products, hand creams and lotions, foot creams and lotions, depilatory creams and lotions, after-shave creams and lotions, tanning creams and lotions, treatment cosmetic products, hair care products, deodorants and antiperspirants, decorative cosmetic products, candles, lamp oils, incense sticks, insecticides, repellents and propellants.

The following examples illustrate the present invention without, however, limiting it in any way: Example 1 : Fragrance composition 1 :

Fragrance composition 1 has an intense and harmonious lily of the valley note indistinguishable from the fragrance characteristics of pure 2-methyl-3-(4-tert.-butylphenyl) propanal (Lysmeral®, BASF SE).

Example 2: Fragrance composition 2:

Fragrance composition 2 has an intense and harmonious lily of the valley note indistinguishable from the fragrance characteristics of pure 2-methyl-3-(4-tert.-butylphenyl) propanal (Lysmeral®, BASF SE).

Example 3: Fragrance Composition 3:

Fragrance composition 3 has an intense and harmonious lily of the valley note similar to that of Fragrance Compositions 1 and 2 with stronger characteristics and slight green floral note compared to pure 2-methyl-3-(4-tert.-butylphenyl)propanal (Lys- meral®, BASF SE).

Example 4: Fragrance Composition 4:

Fragrance composition 4 has an intense and harmonious lily of the valley note similar to that of pure 2-methyl-3-(4-tert.-butylphenyl)propanal (Lysmeral®, BASF SE) with stronger impact.

Example 5: Fragrance Composition 5:

Fragrance composition 5 has an intense and harmonious lily of the valley note similar to that of pure 2-methyl-3-(4-tert.-butylphenyl)propanal (Lysmeral®, BASF SE) with markedly stronger impact and a slightly green floral note. Example 6: Fragrance Composition 6:

Fragrance composition 6 has an intense and lily of the valley note similar to that of pure 2-methyl-3-(4-tert.-butylphenyl)propanal (Lysmeral®, BASF SE) with a greener, floral note.

Example 7: Fragrance Composition 7:

Fragrance composition 7 has an intense and lily of the valley note similar to that of pure 2-methyl-3-(4-tert.-butylphenyl)propanal (Lysmeral®, BASF SE) with a slightly more floral impact, very elegant and rounded-up.

Example 8: Fragrance Composition 8:

Fragrance composition 8 has an intense and harmonious lily of the valley note similar to that of pure 2-methyl-3-(4-tert.-butylphenyl)propanal (Lysmeral®, BASF SE). It is considered to be a very good equivalent in applications such as detergents, home care and laundry products and soaps.

Example 9: Fragrance Composition :

Fragrance composition 9 represents a very refined and well-balanced lily of the valley profile very similar to that of pure 2-methyl-3-(4-tert.-butylphenyl)propanal (Lysmeral®, BASF SE). It is considered to be a perfect substitute in all kinds of application, particularly in fine fragrance compositions.

Example 10: Fragrance Composition :

Fragrance composition 10 also represents a very refined and well-balanced lily of the valley profile, very similar to that of pure 2-methyl-3-(4-tert.-butylphenyl)propanal (Lysmeral®, BASF SE). It is considered to be a little bit milder and harmonious than com- position 9. It is a perfect Lysmeral® substitute in all kinds of applications. Example 1 1 : Fragrance Composition :

Fragrance composition 1 1 also represents a very refined and rounded-up lily of the valley profile, very similar to that of pure 2-methyl-3-(4-tert.-butylphenyl)propanal (Lys- meral®, BASF SE). It is considered to be a little bit milder and floral than composition 9. It is a perfect Lysmeral® substitute in all kinds of applications.

Example 12: Fragrance Composition :

Fragrance composition 12 also represents a very refined and well-balanced lily of the valley profile, very similar to that of pure 2-methyl-3-(4-tert.-butylphenyl)propanal (Lys- meral®, BASF SE). It is considered to be a perfect substitute in all kinds of application, particularly in fine fragrance compositions.

Claims

Claims:

1. A fragrance composition comprising

2. A fragrance composition according to claim 1 , comprising 7-hydroxy-3,7- dimethyloctanal as additional fragrance substance c).

3. A fragrance composition according to claim 1 or 2, comprising 4-isopropyl- cyclohexylmethanol as additional fragrance substance c).

4. A fragrance composition according to any of claims 1 to 3, comprising 2,6- dimethylheptan-2-ol as additional fragrance substance c).

5. A fragrance composition according to any of claims 1 to 4, comprising 3,7- dimethyl-octan-1 ,7-diol as additional fragrance substance c).

6. A fragrance composition according to any of claims 1 to 5, wherein the weight- based ratio of the total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal to the total amount of 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol ranges from 1 :3 to 1 :30.

7. A fragrance composition according to any of claims 2 to 6, wherein the weight- based ratio of the total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal to the total amount of 7-hydroxy-3,7-dimethyloctanal in the fragrance composi- tion ranges from 10:1 to 1 :10.

8. A fragrance composition according to any of claim 3 to 7, wherein the weight- based ratio of the total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal to the total amount of 4-isopropyl-cyclohexylmethanol in the fragrance composi- tion ranges from 5: 1 to 1 : 1.

9. A fragrance composition according to any of claim 4 to 8, wherein the weight- based ratio of the total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal to the total amount of 2,6-dimethylheptan-2-ol in the finished fragrance composi- tion ranges from about 20:1 to about 1 :1.

10. A fragrance composition according to any of claim 5 to 9, wherein the weight- based ratio of the total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal to the total amount of 3,7-dimethyl-octan-1 ,7-diol in the finished fragrance composition ranges from about 1 :20 to about 1 :1.

1 1. A fragrance composition according to any of claims 1 to 10, wherein the fragrance composition comprises, based on the total amount of the composition, a total amount of 2-methyl-3-(3-tert.-butylphenyl)propanal in the range from 0,1 to 30 wt.%.

12. A fragrance composition according to any of claims 1 to 1 1 , wherein the fragrance composition comprises, based on the total amount of the composition, a total amount of 2-isobutyl-4-methyl-tetrahydro-2H-pyran-4-ol in the range from 1 to 70 wt. %.

13. A fragrance composition according to any of claims 1 to 12, wherein the fragrance composition comprises, based on the total amount of the composition, a total amount of 2-methyl-3-(4-tert.-butylphenyl)propanal of 1 wt.% or less.

14. A fragrance composition according to any of claims 1 to 13, wherein the fragrance composition is substantially free of 2-methyl-3-(4-tert.- butylphenyl)propanal.

15. A fragrance composition according to any of claims 1 to 14, wherein the fra- grance compositions comprises one or more diluents selected from the group consisting of diethylene glycol monoethyl ether, glycerol, propylene glycol, 1 ,2-butylene glycol, dipropylene glycol, diethyl phthalate, triethyl citrate and isopropyl myristate and dialkyl esters of 1 ,2-cyclohexanedicarboxylic acid, especially 1 ,2-cyclohexanedicarboxylic acid diisononyl ester.

16. A method for emparting and/or enhancing an odor or flavor of a product or article with a lily of the valley- or muguet-type note, a syringa-type note, a magnolia-type note, a cyclamen-type note, a hyacinth-type note or a lilac-type note comprising bringing into contact or mixing with or adding to said product or ar- tide an organoleptically active quantity of a fragrance composition according to any of claims 1 to 15.

17. A method for producing a perfumed product or article comprising bringing into contact or mixing with or adding to said product or article an organoleptically active quantity of the fragrance composition according to any of claim 1 to 15.

18. A perfumed or aromatized product or article comprising an organoleptically active quantity of the fragrance composition according to any of claim 1 to 15.

19. A perfumed article or product according to claim 18, wherein the article or product is selected from the group consisting of perfume extracts, eaux de parfum, eaux de toilette, after-shave lotions, eaux de Cologne, pre-shave products, splash colognes, perfumed refreshing tissues, acidic, alkaline and neutral cleaning products, textile fresheners, ironing aids, liquid detergents, powder detergents, fabric preconditioners, fabric softeners, washing soaps, washing tablets, disinfectants, surface disinfectants, air purifiers, aerosol sprays, waxes and polishes, body care products, hand creams and lotions, foot creams and lotions, depilatory creams and lotions, treatment cosmetic products, after-shave creams and lotions, tanning creams and lotions, hair care products, deodorants and antiperspirants, decorative cosmetic products, candles, lamp oils, incense sticks, insecticides, repellents and propellants.