EP0573460A1 - Herbicidal pyrones - Google Patents

Abstract

Compounds of formula (I) and / or tautomeric forms thereof, wherein A represents a C1-C3 alkylene or C1-C3 alkenylene group optionally replaced by 1 to 4 C1-C3 alkyl substituents; X represents O, S, SO, SO2, NR10 or an individual bond; R1 represents H or a group of a number of specified groups, or M; R2 represents C1-C6 alkyl or a group of a number of other specified groups; R3 and R4 independently represent H or C1-C4 alkyl; R5 and R6 independently represent H, C1-C4 alkyl or a group of a number of other specified groups optionally replaced as specified, or optionally replaced by substituents including R12 to R23 as specified; or R5 and R6 with the carbon to which they are attached form a ring of a specified number of carbocyclic or heterocyclic rings optionally replaced as specified, where one of the ring carbon atoms may be a carbonyl group or its dimethyl, diethyl or ketal group d 'ethylene or propylene corresponding; R7, R8 and R9 independently represent H, or a group of a specified number of groups, provided that when both R5 and R6 independently represent C1-C4 alkyl, C2-C4 alkenyl, C2-C6 alkylthioalkyl, C1- haloalkyl C4, C2-C4 haloalkenyl or C3-C6 cycloalkyl optionally replaced by specified substituents, or when R5 and R6 together form an optionally substituted saturated or unsaturated carbocyclic or heterocyclic ring, then at least R7 and / or R8 and / or R9 represent a benzenesulfonyl, benzoyl, benzyl, benzyloxy, pyridyl, phenoxy, phenylthio or phenylamino group optionally substituted or phenyl replaced by 1 to 3 substituents chosen from the group consisting of halogen, C1-C4 alkyl, C1-C4 alkoxy and CF3; R10 represents H, C1-C4 alkyl or phenyl optionally substituted as specified; M represents Li +, Na +, K +, NH4 +, or N (R11) 4+ where R11 represents C1-C4 alkyl. The invention also relates to herbicidal and plant growth compounds containing them,

Description

HERBICIDAL PYRONES

The present invention relates to organic compounds having herbicidal properties and plant growth regulating properties; to herbicidal compositions and processes utilising such compounds and to plant growth regulating compositions and processes utilising such compositions.

The use of certain cyclohexane-l,3-dione derivatives as grass herbicides is known in the art. Thus, for example, the compendium "Agricultural Chemicals - Book II Herbicides 1983-84 Revision" (W.T. Thomson Editor, Thomson Publications, California U.S.A.) describes the cyclohexane-l,3-dione derivatives known

commercially as Alloxydim sodium

(methyl-3-[1-(allyloxyimino)butyl]-4-hydroxy-6,6-dimethyl-2-oxocyclohex-3-ene carboxylate), Cycloproxydim ((E,E)-2[1[1-[(3-chloro-2-propenyl)oxy]imino]butyl]-5- [2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one), and Sethoxydim

(2-[1-(ethoxyimino)butyl]-5-[2-ethylthio]propyl-3-hydroxy-2-cyclohexen-l-one) as selective post-emergent herbicides. Alloxydim and Sethoxydim have been disclosed Australian Patent No. 464,655 and Australian Patent Application No. 35314/78 respectively.

Australian Patent No 560,716 (Watson et al, Application No 27196/84) in the name of ICI Australia Limited, published 22 November 1984, discloses herbicidal compounds of the formula:

wherein

R is substituted phenyl; R¹ is H, alkyl, alkenyl, alkynyl, alkoxyalkyl, alkylthioalkyl, alkylsulfonyl, alkoxy, allcylthio, acyl, (un)substituted phenylalkyl or PhSO₂ ;

R² is alkyl, alkenyl, haloalkenyl, alkynyl, haloalkynyl,

haloalkyl, alkoxyalkyl, alkylthioalkyl or (un)substituted phenylalkyl; and

R³ is alkyl, fluoroalkyl, alkenyl, alkynyl, or phenyl.

Watson et al teach that tetrahydropyran-2,4-dione derivatives which are substituted in the 6-position with a substituted phenyl group exhibit particularly useful herbicidal activity.

United States patent No 4,008,067 (issued February 15, 1977) in the name of Hirono et al discloses herbicidal oxacyclohexane derivatives of the formula:

wherein:

R¹ is lower alkyl;

R² is lower alkyl, lower alkenyl or lower alkynyl;

A is

wherein

R³ is H or lower alkyl;

R⁴ is lower alkyl or phenyl; or

R³ forms cycloalkylene of 4 to 5 carbon atoms by combining with R⁴ ;

OR

wherein

R⁵ and R⁷ are selected from the group consisting of H and lower alkyl; R⁶ is lower alkyl;

OR

wherein

R⁸ is H or lower alkyl; and

R⁹ is lower alkyl.

The above compounds are substituted in the 5 and/ or 6- positions of the pyran rin g by one or two alkyl groups

International patent application PCT/AU87/00236, filed July 27, 1987 (International Patent Publication WO 8800945) in the name of the present applicants and corresponding to Australian patent application No 77583/87, European patent application No 87904820, Japanese patent application No 504 646 and United States Patent No. 4,939,278, describes herbicidal pyrones of the formula:

wherein, in part,

R¹ is H;

R² is substituted alkyl wherein the alkyl group is substituted by optionally substituted phenyl and optionally substituted heterocycle;

R³ is alkyl;

R⁴ and R⁵ together with the carbon to which they are attached form a substituted or unsubstituted saturated or partially saturated heterocyclic or carbocyclic ring containing 3 or more ring atoms; etc. This is only a brief listing of the relevant groups. The last mentioned spirocyclic analogues are stated as being a preferred subgenus. Further preferred are compounds in which R¹ is H, R² is alkyl, alkenyl or haloalke (specifically ethyl, allyl, 2-chloroallyl and 3-chloroallyI) and R³ is ethyl or n-propyi. WO 8800945 at Tables 1-4 lists 91 individual spirocyclic compounds, all with R² as ethyl, allyl or chloroallyl only. At page 23A the specification teaches that "The compounds of the invention are substantially more effective against

monocotyledonous plants or grass species than against dicotyledonous plants or broad-leaved species.". Although it is also stated on pages 23A and 25 of this specification that "certain of the compounds show selective herbicidal activity against wild grasses in monocotyledonous crop species and hence may be used for selective control of wild grass in graminaceous crops", the application emphasises th e use of the disclosed compounds for control of grass weeds in broadleaf crops without damage to the broadleaf crop.

International patent application PCT/AU89/00191 also in the name of the present applicants, describes herbicidal pyrones that are similar to those described in

WO8800945, but which have an additional substituent, R⁶, on the pyrone ring. The compounds described in PCT7AU89/00191 are of the general formula:

wherein the substituted groups R¹ to R⁵ are similar to those described in WO

8800945, and,

R⁶ is selected from alkyl, alkoxy, alkylthio, halogen or substituted alkyl wherein the alkyl group is substituted with a substituent selected from the group consisting of alkoxy, alkylthio or halogen. Preferred values for the oxime capping group R² are alkyl, alkenyl, alkynyl and haloalkenyi; specifically preferred are ethyl, propargyl, allyl, 2-chloroallyl and

3-chloroallyl. This specification states "certain of the compounds of Formula 2 may be used for selective control of wild grass in graminaceous crops." However there is no specific mention of which compounds or of usefulness on rice crops.

The specification of PCT/AU89/00191 includes 15 examples relating to spirocyclic derivatives, but the oxime capping groups shown are restricted to ethyl, allyl or chloro allyl.

International Patent Application PCT/AU91/00019 also by the present applicants claims a series of compounds with selectivity for weed grasses in rice wherein the capping group R² is :

wherein R⁷, R⁸ and R⁹ are independentiy H, halogen, C₁-C₄ alkyl, C₁-C,₄ alkoxy, C₁-C₄ alkylthio, C₁-C₄ alkylsulfinyl, C₁-C₄ alkylsulfonyl,

C₁-C₄ haloalkyl, C₁-C₄ haloalkoxy, nitro, cyano, C₁-C₄ alkoxycarbonyl, C₁-C₄ alkylaminocarbonyl, C₂-C₆ dialkylaminocarbonyl, aminocarbonyl, phenyl, amino, C₁-C₄ alkylamino, or C₁-C₄ dialkylamino.

We have discovered that compounds similar to those described in International Patent Application WO 8800945, PCT/AU89/00191 and PCT/AU91/00019 in which R² includes a phenyl group itself substituted with an optionally substituted phenyl group which is linked either directly or via a small group, for example by a

methylene, oxy or thio bridge, are highly active and more selective pre-emergent and/or post-emergent herbicides or plant growth regulators which are particularly useful for controlling certain grass weeds in dryland and paddy rice. Accordingly, the invention provides a compound of Formula (1):

wherein

A is a C₁-C₃ alkylene or C₁-C₃ alkenylene group optionally substituted with 1-4

C₁-C₃ alkyl substituents;

X is O, S, SO, SO₂, NR¹⁰ or a single bond;

R¹ is H, C₁-C₄ alkyl, C₁-C₄ alkenyl, C₂-C₄ alkynyl, C₅-C₆ cycloalkyl, C₅-C₆

cycloalkenyl, C₁-C₄ alkylcarbonyl, phenylcarbonyl, phenyl optionally substituted with 1-3 substituents selected from the group consisting of halogen, C₁-C₄ alkyl,

C₁-C₄ alkoxy, C₁-C₄ alkylthio, nitro, cyano, C₁-C₄ haloalkyl, amino, and C₁-C₄ haloalkoxy, C₁-C₄ alkylsulfonyl, benzenesulfonyl, C₁-C₄ alkylcarbonyl, C₂-C₈ alkoxyalkyl, C₂-C₈ alkylthioalkyl, C₇-C₁₀ phenylalkyl or M; R² is C₁-C₆ alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl, C₁-C₄ haloalkyl, C₁-C₄ alkylthio, C₆ cycloalkyl, C₁-C₄ cycloalkenyl, phenyl optionally substituted with 1-3 substituents selected from the group consisting of halogen, C₁-C₄ alkyl, C₁-C₄ alkylthio, nitro, cyano, C₁-C₄ haloalkyl, amino, and C₁-C₄ haloalkoxy, C₁-C₄ alkoxyalkyl, C₂-C₈ alkylthioalkyl, or C₁-C₄ alkyl substituted with a substituent selected from the group consisting of phenyl, phenoxy and thiophenoxy where the aromatic ring of said substituents may be substituted with 1-3 substituents selected from halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄ alkylthio, nitro, cyano, amino, C₁-C₄ haloalkyl and C₁-C₄ haloalkoxy; R³ and R⁴ are independently H or C₁-C₄ alkyl;

R⁵ and R⁶ are independently H, C₁-C₄ alkyl, C₂-C₄ alkenyl, C₂-C₆ alkylthioalkyl, C₁-C₄ haloalkyl, C₂-C₄ haloalkenyi or C₃-C₆ cycloalkyl wherein the alkyl, alkenyl and cycloalkyl groups are optionally substituted with 1-3 substituents selected from the group consisting of OR¹², NR¹³R¹⁴, NR¹⁵C(O)(C₁-C₄ alkyl), NR¹⁸SO₂C₁-C₄ alkyl), NR²¹C(O)(C₁-C₄ alkyl), C(OR¹⁶)(OR¹⁷)R²²,

C(SR¹⁹)(SR²⁰)R²³, C₁-C₄ alkoxycarbonyl and phenyl which may be substituted with a substituent selected from halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄ alkylthio, nitro, cyano, C₁-C₄ haloalkyl and C₁-C₄ haloalkoxy;

OR

R⁵ and R⁶ together with the carbon to which they are attached form a fully

saturated or an unsaturated 3- to 7-membered carbocyclic ring, or a fully saturated or an unsaturated 5- to 7-membered heterocyclic ring containing 1-3 heteroatoms selected from the group consisting of 0-3 nitrogen, 0-2 oxygen and 0-2 sulfur atoms; said ring may be substituted with 1-4 substituents selected from the group consisting of halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₂-C₄ alkenyl, C₂-C₄ alkynyl, C₁-C₄ alkylcarbonyl, C₁-C₄ alkoxy, C₁-C₄ alkylthio, C₁-C₄ alkoxycarbonyl, -COOH, C₂-C₈ alkoxyalkyl, C₂-C₈ alkylthioalkyl, and phenyl which is optionally substituted with a substituent selected from halogen, C₁-C₄ alkoxy, C₁-C₄ alkylthio, C₁-C₄ haloalkyl, nitro, cyano and C₁-C₄ haloalkoxy; one of the carbon atoms of said ring may be in the form of a carbonyl group or its corresponding dimethyl, diethyl or ethylene or propylene ketal;

R⁷, R⁸ and R⁹ are independentiy H, halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄

alkylthio, C₁-C₄ alkylsulfinyl, C₁-C₄ alkylsulfonyl, C₁-C₄ haloalkyl, C₁-C₄ haloalkoxy, nitro, cyano, C₁-C₄ alkoxycarbonyl, C₁-C₄ alkylaminocarbonyl,

C₂-C₆ dialkylaminocarbonyl, aminocarbonyl; amino; C₁-C₄ alkylamino, C₂-C₆ alkylamino; or benzenesulfonyl, benzoyl, benzyl, benzyloxy, pyridyl, phenoxy, phenylthio, phenylamino or phenyl group said group optionally substituted wit 1-3 substituents selected from the group consisting of halogen, C₁-C₄ alkyl,

C₁-C₄ alkoxy, and CF₃;

provided that when both R⁵ and R⁶ are independentiy C₁-C₄ alkyl, C₂-C₄ alkenyl,

C₂-C₆ alkylthioalkyl, C₁-C₄ haloalkyl, C₂-C₄ haloalkenyi or C₃-C₆ cycloalkyl optionally substituted with a substituent selected from the group consisting of C₁-C₄ alkoxycarbonyl and phenyl which may be substituted with a substitue selected from halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄ alkylthio, nitro, cyan

C₁-C₄ haloalkyl and C₁-C₄ haloalkoxy, or when R⁵ and R⁶ together form an optionally substituted saturated or unsaturated carbocyclic or heterocyclic ri then at least one of R⁷, R⁸, or R⁹ is an optionally substituted benzenesulfonyl, benzoyl, benzyl, benzyloxy, pyridyl, phenoxy, phenylthio or phenylamino gro or at least one of R⁷, R⁸ or R⁹ is phenyl substituted with 1-3 substituents selected from the group consisting of halogen, C₁-C₄ alkyl, C₁-C₄ alkyl, C₁-C₄ alkoxy and CF₃, R¹⁰ is H, C₁-C₄ alkyl or phenyl optionally substituted with 1-3 substituents select from the group consisting of halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄ alkylt

C₁-C₄ haloalkyl and C₁-C₄ haloalkoxy; M is Li⁺, Na⁺, K⁺, NH₄ ⁺ or N(R¹¹)₄ ⁺ where R¹¹ is C₁-C₄ alkyl;

R¹² is H, C₁-C₄ alkyl, C(O)(C₁-C₄ alkyl)or CO₂(C_C-C₄ alkyl);

R¹³, R¹⁵, R¹⁸, R²¹, R²² and R²³ are independentiy H or C₁-C₃ alkyl;

R¹⁴, R¹⁶, R¹⁷, R¹⁹ and R²⁰ are independentiy C₁-C₃ alkyl;

R¹⁶ and R¹⁷ taken together may be -(CH₂)₂- or -(CH₂)₂-; and

R¹⁹ and R²⁰ taken together may be -(CH₂)₂- or -(CH₂)₃-.

In the above definitions, the term "alkyl", used either alone or in compound words such as "alkylthio" or "haloalkyl", denotes straight chain or branched alkyl, e.g. meth ethyl, n-propyl, isopropyl or the different butyl, pentyl or hexyl isomers;

Alkoxy denotes methoxy, ethoxy, n-propoxy, isopropyloxy, and the different butyloxy isomers.

Alkenyl denotes straight chain or branched alkenes, e.g. vinyl,

1-propenyl, 2-propenyl, 3-propenyl, etc.

Alkynyl denotes straight chain or branched alkynes, e.g., ethynyl, 1-propynyl, 2-propynyl, and the different butynyl isomers.

Alkylsulfonyl denotes methylsulfonyl, ethylsulfonyl, propylsulfonyl, and the different butylsulfonyl isomers.

Alkylthio, alkylsulfinyl, alkylamino, etc. are defined in an analogous manner.

Cycloalkyl denotes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl. The term "halogen", either alone or in compound words such as "haloalkyl", denotes fluorine, chlorine, bromine or iodine. Further, when used in compound words such as "haloalkyl" said alkyl may be partially halogenated or fully substituted with halogen atoms which may be the same or different. Examples of haloalkyl include CH₂CH₂ CF₂CF₃ and CH₂CHFCl.

Alkylcarbonyl denotes acetyl, propionyl, and the different butyryl isomers.

Alkoxycarbonyl denotes methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, and the different butoxycarbonyl isomers.

The total number of carbon atoms in a substituent group is indicated by the C_i-C_j prefix where i and j are numbers from 1 to 10. For example, C₁-C₄ alkylthioalkyl would designate -CH₂SCH₃ -CH₂SC₂H₅ -CH₂CH₂SCH₃ or -CH(CH₃)SCH₃, and C₂-C₅ alkoxyalkyl would represent -CH₂OCH₃ through to -(CH₂)₄OCH₃ or -CH₂O(CH₂)₃CH₃ and the various structural isomers embraced therein.

Alkylene denotes methyene (-CH₂-), ethylene (-CH₂CH₂-), propylene and butylene; alkenylene denotes -CH= CHCH₂-, -CH = CHCH₂CH₂-, and -CH₂CH=CHCH₂-. It should be recognized that when R¹ is hydrogen the compounds of the invention may undergo tautomerisation. All tautomeric forms are included in the scope of this invention. Preferred groups of compounds of general Formula (1), for reasons including ease synthesis and greater herbicidal efficacy, include the following:

(1) Compounds of Formula (1) wherein

R¹ is H or M; and

R² is C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₂-C₄ alkenyl or C₂-C₄ alkynyl .

(2) Compounds of 1 above wherein

A is C₁-C₄ alkylene or C₁-C₄ alkenylene optionally substituted with CH₃ or QH₅;

R⁷, R⁸ and R⁹ are independently H, CI, Br, F, C₁-C₃ alkyl, C₁-C₃ alkoxy, C₁-C₃ alkylthio, C₁-C₄ haloalkyl, C₁-C₄ haloalkoxy, nitro, cyano or C₁-C₃

alkoxycarbonyl; or benzenesulfonyl, benzoyl, benzyl, benzyloxy, phenoxy, phenyl, phenylthio or phenylamino optionally substituted with 1-3 substituent selected from the group consisting of halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, or

CF₃;

provided that at least one of R⁷, R⁸, or R⁹ is an optionally substituted benzenesulfonyl, benzoyl, benzyl, benzyloxy, phenoxy, phenyl, phenylthio or phenylamino group; and

R¹⁰ is H or CH₃

(3) Compounds of 2 above wherein X is O

(4) Compounds of 2 above wherein X is S, SO or SO₂.

(5) Compounds of 2 above wherein X is NR¹⁰.

(6) Compounds of 2 above wherein X is a single bond. (7) Compounds of 6 above wherein:

A is -CH₂-, -CH₂CH₂- or -CH₂CH = CH- ;

R¹ is H, Li+, Na+, or K+; R² is CH₃, QH₅, n-C₃H₇ or n-QH₉ ;

R³ and R⁴ are independentiy H, CH₃ or QH₅ ; and

R⁷, R⁸ and R⁹ are independentiy H, CI, Br, F, CH₃, QH₅, OCH₃, OC₂H₅, SCH₃, SC₂H₅, CF₃, CHF₂, CF₂CF₃, OCHF₂, OCF₃, OCH₂CF₃, NO₂, CN CO₂CH₃, Ph, SO₂Ph, COPh, CH₂Ph, OCH₂Ph, OPh, SPh,

NHPh or N(Me)Ph provided that at least one of R⁷, R⁸, or R⁹ is an optionally substituted benzenesulfonyl, benzoyl, benzyl, benzyloxy, phenoxy, phenyl, phenylthio or phenylamino group. (8) Compounds of 6 above wherein R⁵ and R⁶ are independently C₁-C₄ alkyl, C₂-C₄ alkenyl, C₂-C₄ alkynyl, C₁-C₄ alkylthio or C₂-C₆

alkylthioalkyl.

(9) Compoimds of 6 above wherein R5 and R⁶ together with the carbon to which they are attached form a saturated or unsaturated 5-, 6- or

7-membered carbocyclic ring which is optionally substituted with 1-4 CH₃ groups.

(10) Compounds of 9 above wherein

A is -CH₂-, -CH₂CH₂- or CH₂CH = CH- ;

R¹ is H, Li + , Na+ or K+;

R² is CH₃, C₂H₅, n-QH₇ or n-C₄H₉;

R³ and R⁴ are independentiy H or CH₃; and

R⁷, R⁸ and R⁹ are independentiy H, CI, Br, F, CH₃, QH₅, OCH₃, OC₂H₅, SCH₃, SC₂H₅, CF₃, CHF_Z CF₂CF₃, OCHF_2, OCF₃, OCH₂CF₃,

NO₂, CN, CO₂CH₃, Ph, SO₂Ph, COPh, CH₂Ph, OCH₂Ph, OPh, SPh, NHPh or N(Me)Ph provided that at least one of R⁷, R⁸, or R⁹ is an optionally substituted benzenesulfonyl, benzoyl, benzyl, benzyloxy, phenoxy, phenyl, phenylthio or phenylamino group.

(11) Compounds of 6 above wherein R⁵ and R⁶ together with the carbon to which they are attached form a saturated or unsaturated 5-, 6- or 7-membered heterocyclic ring

containing 1-2 heteroatoms selected from the group consisting of 0-2 nitrogen, 0-1 oxygen and 0-2 sulfur atoms; said ring is optionally

substituted with 1-4 CH₃ groups.

(12) Compounds of 11 above wherein

A is -CH₂-, -CH₂CH₂- or -CH₂CH = CH- ;

R¹ is H, Li+, Na+ or K+;

R² is CH₃ C₂H₅, n-QH₇ or n-QH₉;

R³ and R⁴ are independently H, CH₃ or QH₅ ; and

R⁷, R⁸ and R⁹ are independentiy H, CI, Br, F, CH₃, QH₅, OCH₃, OQH₅, SCH₃, SC₂H₅, CF₃, CHF_2, CF₂CF₃, OCHF_2, OCF₃, OCH₂CF₃, NO_2, CN, CO₂CH₃, Ph, SO₂Ph, COPh, CH₂Ph, OCH₂Ph, OPh, SPh, NHPh or N(Me)Ph provided that at least one of R⁷, R⁸, or R⁹ is an optionally substituted benzenesulfonyl, benzoyl, benzyl, benzyloxy, phenoxy, phenyl, phenylthio or phenylamino group.

Specifically preferred, for reasons of greatest herbicidal efficacy, greatest selectivity rice and/or most favorable ease of synthesis are:

9-hydroxy-8-[ 1-((3-(phenoxy)phenyl)methoxyimino)butyl]-6-oxaspiro[4,5]dec-8-en-7-one, which has the formula;

8-[ 1-((4-(4-fluorophenyl)phenyl)methoxyimino)butyl]-9-hydroxy-6- oxaspiro[4.5]dec-8-en-7-one, which has the formula;

9-hydroxy-8-[ 1-((4-(phenyl)phenyl)methoxyimino)butyl]-6-oxaspiro[4.5]dec-8-en-7-one, which has the formula;

6,6-dimethyl-4-hydroxy-3-(1-((4-(phenyl)phenyl)methoxyimino)butyl)pyranyone, which has the formula;

and 6,6-dimethyl3-(1-((4-(4-fluorophenyl)phenyl)methoxyimino)butyl)-4-hydroxypyran-2-one, which has the formula;

Specific examples of compounds of the invention of Formula (1) include those compounds detailed in Tables 1-4 below. Unless otherwise specified in the Tables is taken to be a single bond.

The compounds of the invention may be prepared by a method similar to that disclosed in WO8800945, with appropriate alteration of starting reagents. For example, the compounds of the invention may be prepared from the dianion of an acetoacetate ester by condensation with an appropriate ketone(cf. Hukin,S.N., and Weller, L. Can J Chem, 1974, 52, 2157) followed by cyclization with or without intermediate hydrolysis to novel tetrahydro-2H.-pyran-2,4-diones. The pyrandiones or their tautomeric 4-hydroxy-5,6-dihydro-2H-pyran-2-one equivalents can also be obtained by customary methods described in the literature. The 6,6-disubstituted pyran-2,4-diones thus obtained may be acylated on oxygen and the enol esters isomerized (Fries rearrangement) to give novel C-substituted products. The

C-acylated derivatives may be reacted with O-substituted hydroxylamines which may in turn be generated in situ from appropriate precursors, to afford derivatives of the general Formula(1) wherein R¹ is hydrogen. Compounds of the invention of Formula(l) wherein R¹ is not hydrogen may be prepared by standard synthetic procedures. For example, compounds of the invention of Formula(l) wherein R¹ is is an organic or inorganic cation may be prepared fro compounds of the invention of Formula(1) wherein R¹ is hydrogen by reacting these latter compounds with an appropriate inorganic or organic base.

Esterification of the vinylogous acid in compounds of the invention of Formula(1) wherein R¹ is hydrogen provides further herbicidal and growth regulating derivatives.

The general procedure for preparation of Compounds of the Invention is described in detail in the following section.

Geπeral Procedure for Preparation of Compounds of the Invention

(a) Synthesis of the Pyran-2,4-diones

To a stirred solution of the sodium salt of an (alkyl) acetoacetate ester [ca. 55 mmol, either preformed or made in situ from the (alkyl) acetoacetate ester ( 55 mmol) and sodium hydride (55 mmol) according to the method of Huckin, S.N., and Weiler, L., Can. J. Chem., 1974, 52, 2157] in dry tetrahydrofuran (50 ml) under nitrogen and cooled to 0 °C, was added dropwise a solution of n-butyllithium (21.2 ml, 2.6M in hexane, 55 mmol). After 1 h the mixture was treated with an appropriate ketone (50 mmol) (solid ketones were dissolved in tetrahydrofuran prior to addition ) and left stirring at 0 °C for 120 min before being quenched with methanol (2.4 ml, 60 mmol). After addition of further methanol (20 ml) and water (10 ml) [and in certain instances acid] the mixture was boiled for ca.30 min then diluted further with water (40ml) and concentrated (to ca. 40 ml) at reduced pressure. Upon cooling and addition of water (ca. 150 ml) the mixture was extracted with ether (2 x 100 ml). The ether extracts were washed with water (50 ml); and the combined aqueous phases were acidified to pH 1-2 with cone, hydrochloric acid and extracted with ether (100 ml). (At this stage of some reactions a first crop of the pyrandione crystallized from the ether solution and was recovered by filtration.) The ether solution was then evaporated and the residual water removed from the product mixture by azeotropic distillation with ethanol/benzene and then with benzene. The residue was either chromatographed (SiO₂, dichloromethane) or, in some instances, crystallization of the pyrandione was achieved by diluting a concentrated benzene solution (ca. 20 ml) of the residue cautiously with cyclohexane to a faint turbidity, and then stirring vigorously. When crystallization ensued, the mixture was cautiously diluted with more cyclohexane (ca. 20 ml) and stirred for a further 4 h, after which the precipitate was collected and washed with cyclohexane/benzene (4:1) to afford the pyrandione . Method B

A solution of n-butyllithium (45 ml, 2.45M in hexane, 110 mmol) was added to a stirred solution of diisopropylamine (15.6 ml, 111 mmol) in tetrahydrofuran (50 ml maintained at 0 °C under argon. The stirring was continued for 15 min at room temperature; the mixture was then chilled in ice. The (alkyl) acetoacetate ester(52 mmol) was then added and the resultant mixture stirred at 0 °C for 30 min whereupon an appropriate ketone (50 mmol dissolved in the minimum quantity of tetrahydrofuran to form a homogeneous solution) was added and stirring continued for an additional 90 min (or until the reaction mixture paled to light orange or yellow) before quenching with methanol (4.8 ml, 120 mmol). The reaction mixture was then worked up as in Method A to give the pyrandione.

(b) Acylation of Pyrandiones

To a stirred solution of the pyrandione (6.10 mmol) and DBU

[1,8-diazabicyclo(5.4.0)-7-undecene](0.99g, 6.5 mmol) in toluene (20ml) at 0 °C was added an appropriate acyl chloride (6.6 mmol) and the mixture stirred at 0 °C for 2 then at room temperature for 24 h. Dilution with water (50 ml) and toluene (30 ml and shaking the mixture gave an organic phase which was quickly washed with 5% hydrochloric acid, dried (sodium sulf ate) and evaporated in vacua The residue and 4-dimethylaminopyridine (40 mg, 0.3 mmol) were heated under reflux in toluene (10 ml) for 3 h (or until thin layer chromatography showed that the reaction was complete) and then the toluene was removed in vacua and the residue

chromatographed [SiO₂, dichloromethane:light petroleum (b.p. 40-60C): ethyl acetate (4:4:1)] to give the C-acylated compound.

(c) Qximation of Acylated Compounds. A mixture of the C-acylated compound (3.75 mmol), the appropriate O-substitued hydroxylamine hydrochloride (4.00 mmol), triethylamine (0.41 g, 4.0 mmol) and methanol (5 ml) was stirred at room temperature for 48 h, then poured into water (50 ml). Acidification of the mixture to pH 4 with 5M hydrochloric acid, extraction with diethyl ether or ethyl acetate (2 x 50 ml), evaporation of the organic phase and chromatography [SiO₂, dichloromethane or dichloromethanerlight petroleum (b.p. 40-60C):ethyl acetate (4:4:1)] of the residue then afforded examples of compounds of the invention (1).

Activity of Compounds of the invention

Test results indicate that the compounds of this invention are highly active

pre-emergent and/or post-emergent herbicides or plant growth regulants. These compounds are particularly useful for controlling certain grass and broadleaf weeds dryland and paddy rice ( Oryza sativa), examples of which include, but are not limited to, Indica and Japonica varieties of the crop. Many of the compounds of this invention are especially useful for the control of selected grass weeds, such as barnyardgrass (Echinochloa crusgalli), in paddy rice.

At the appropriate application rates, these compounds also have utility for

broad-spectrum pre- and/or post-emergence weed control in areas where control of all vegetation is required. Alternatively, these compounds are useful to regulate pla nt growth.

Rates of application for compounds of this invention are determined by a number of factors. These factors include formulation selection, method of application, amount of vegetation present, growing conditions, etc. In general, the subject compounds should be applied at rates of 0.05 to 10 kg/ha with a preferred rate range of 0.1 to 2 kg/h One skilled in the art can easily determine application rates necessary for the desired level of weed control.

Compounds of this invention may be used alone or in combination with other commercial herbicides, insecticides or fungicides. A list of such commercial compounds is given in Appendix A of PCT/AU91/00019 which is incorporated herein by reference. Accordingly, in yet a further embodiment, the invention provides a herbicidal composition comprising a mixture of at least one herbicidal compound of Formula (1) as hereinbefore defined with at least one other herbicide. still further embodiment, the invention provides a met-hod for regulatihe the growth of a plant comprising applying to the plant, to the seed of the plant, or to growth medium of the plant an effective amount of a compound of Formula (1) as hereinbefore defined.

Rates of application of these compounds can be influenced by many factors of the environment and should be determined under actual use conditions. Weed grasses in graminaceous crops can normally be killed when treated at a rate of from less than 0.1 to about 20 kg active ingredient/ha.

The compounds of this invention can be mixed with fungicides, bactericides, acaricides, nematicides, insecticides, or other biologically active compounds in order to achieve desired results with a minimum expenditure of time, effort and material. Amounts of these biologically active materials added for each part by weight of the composition of this invention may vary from 0.05 to 25 parts by weight. Suitable agents of this type are well-known to those skilled in the art.

Formulation

Useful formulation of the compounds within the scope of this invention can be prepared in conventional ways. They include dusts, granules, pellets, solutions, emulsions, wettable powders, emulsifiable concentrates and the like. Many of these may be applied directly. Sprayable formulations can be extended in suitable media and used at spray volumes of from one litre to several hundred litres per hectare. High strength compositions are primarily used as intermediates for further formulations. The formulations, broadly, contain about 1% to 99% by weight of active ingredients(s) and at least one of (a) about 0.1% to 20% surfactants(s) and about 5% to 99% solid or liquid inert diluent(s). More specifically, they will contain these ingredients in the following approximate proportions:

Percent by Weight

Active

Ingredient Diluents(s) Surfactant(s)

Wettable Powders 20-90 0-74 1-10

Oil Suspensions, Emulsions, 5-50 40-95 0-15

Solutions (including Emulsifiable

Concentrates)

Aqueous Suspensions 10-50 40-84 1-20

Dusts 1-25 70-99 0-5

Granules and Pellets 1-95 5-99 0-15

High Strength Compositions 90-99 0-10 0-2

Lower or higher levels of active ingredients can, of course, be present depending on the intended use and die physical properties of the compound. Higher ratios of surfactant to active ingredient are sometimes desirable and are achieved by incorporation into the formulation of by tank mixing. The compositions may be in the form of dusting powders or granules comprisi the active ingredient and a solid diluent or carrier therefor, for example, kaolin, bentonite, kieselguhr, dolomite, calcium carbonate, talc, powdered magnesia, Fuller's earth, gypsum, Hewitt's earth, diatomaceous earth, and China clay. The compositions may also be in the form of dispersible powders or grains comprising a wetting agent to facilitate the dispersion in liquids of the powder or grains which may contain also solid diluents, fillers and suspending agents.

Typical solid diluents are described in Watkins, et al., "Handbook of Insecticide Dust Diluents and Carriers", 2nd Ed., Dorland Books, Caldwell, NJ. The more absorptive diluents are preferred for the wettable powders and the denser ones for dusts. All formulations can contain minor amounts of additives to reduce foam, caking, corrosion, microbiological growth, etc. Compositions for dressing seed, for example, may contain an agent (for example a mineral oil) for assisting the adhesion of the composition to the seed.

The aqueous dispersions or emulsions may be prepared by dissolving the active ingredient(s) in an organic solvent optionally containing wetting, dispersing or emulsifying agent(s) and then adding the mixture to water which may also contain wetting, dispersing or emulsifying agent(s). Suitable solvents are acetone, ethylene dichloride, isopropyl alcohol, propylene glycol, diacetone alcohol, toluene, kerosene, methylnaphthalene, the xylenes and trichloroethylene amongst others. Solubility under 0.1% is preferred for suspension concentrates; solution concentrates are preferably stable against phase separation at 0 °C. "McCutcheon's Detergents and Emulsifiers Annual", MC Publishing Corp., Ridgewood, N.J., as well as Sisely and Wood, "Encyclopedia of Surface Active Agents", Chemical Publishing Co., Inc., New York, 1964, list surfactants and recommended uses.

The methods of making such compositions are well known. Solutions are prepared by simply mixing the ingredients. Fine solid compositions are made by blending and, usually, grinding as in a hammer or fluid energy mill. Suspensions ar e prepared by wet milling (see, for example, Littler, U.S. Pat. No. 3,060,084). Granules and pellets may be made by spraying the active material upon preformed granular carriers or by agglomeration techniques.

The synthesis of the compounds of the invention is further illustrated by the descriptions in the following examples.

Example 1 (Compound 1.32)

Preparation of 9-hydrcoxy-8-[1-(3-(phenroxy)phenyl)methoxyimino)butyl ]-6- oxaspiro[45]dec-8-en-7-one.

To a mixture of O-(3-(phenoxy)phenyl)methyl hydroxylamine hydrochloride (0.63g) and triethylamine (0.25g) in ethanol (10.0 ml) stirred at 20'C was added

8-butyryl-6-oxaspiro[4.5]dec-7,9-dione (0.48 g). After 24 hours at 20'C the mixture diluted with water (100 ml), acidified to pH 3 with 5 N hydrochloric acid and extracted with diethyl ether. Evaporation of the organic phase and chromatography the residue over silica gel gave the product (0.41 g) as a pale yellow oil,

1H n.m.r. δ (CDCl₃) 0.97, broad t, J 7 Hz, CH₃; 1.2-2.4, m, 10 H, cyclopentyl and CH₂CH₃; 2.65, s, COCH₂ 2.94, broad t, J 8Hz, CH₂CH₂CH₃; 4.98, s, OCH₂ and 7.0-7.5, s, aromatic H.

Other compounds of the invention were prepared by the general method given abo they were characterised by their proton nmr spectra and by melting point (if solid). Physical data for selected compounds is given below. compound 131 pale yellow oil, ¹H n.m.r. δ (CDCl₃) 1.12, t, J7Hz. CH₃; 1.4-22, m, cyclopent H; 2.65, s, COCH₂; 2.9, q, J7Hz, CH₂CH₃; 4.98, s, OCH₂ and 6.9-7.4, m, ArH

compound 1.33 colourless oil, ¹H n.m.r. δ (CDCl₃) 0.92, t, J7Hz. CH₂CH₃; 1.15, d, J6Hz,

CHCH₃; 1.3-2.1, m, cyclopent H and CH₂CH₂CH₃; 2.42, q, J6Hz; CHCH₃; 2.85-3.2, m, CH₂CH₂CH₃; 4.98, s, OCH₂ and 6.8-7.4, m, ArH

compound 1.34 pale yellow oil, ¹H n.m.r. δ (CDCl₃) 0.95, t, J7Hz. CH₃; 1.4-2.2, m, cyclopent H and CH₂CH₂CH₃; 2.64, s, COCH₂; 2.96, q, J7Hz, CH₂CH₃; 4.98, s, OCH₂ and 7.0-7.5, m, ArH compound 152 yellow oil, ¹H n.m.r. δ (CDCI₃) 0.92, t, J7Hz. d^CH₃; 1.15, d, J6Hz,

CHCH₃; 1.2-2.0, m, cyclohex H and CH₂ CH₂2.40, q, J6Hz; CHCH₃; 2.87, t, J7Hz, CH₂CH₂CH₃; 4.88, s, OCH₂ and 6.8-7.3, m, ArH

compound 156 pale yellow oil, ¹H nsa.r. δ (CD Cl₃) 0.92, t, J7Hz. CH₂CH₃; 1.1-2.1, m, cyclohept H and CH₂CH₂CH₃; 2.51, s, OCH₂; 2.91, t, J7Hz, CH₂CH₂CH₃; 4.88, s, OCH₂ and 6.8-7.4 m, ArH

compound 159 m. p. 70, ¹H n.m.r. δ (CDCl₃) 0.93, t, J7Hz. CH₃; 12-2.0, m, cyclopent H and CH₂CH₂CH₃; 2.65, s, COCH₂; 2.93, q, J7Hz, CH₂CH₂CH₃; 5.06, s, OCH₂ and 72-7.7, m, ArH compound 1.63 pale yellow oil, -Η n_m.r. δ (CDC1₃) 0.88, t, J7Hz. CH₃; 13-2.1, m, cyclopent H and CH₂CH₃; 2.62, s, COCH₂; 2.92, q, J7Hz, CH₂CH₂CH₃; 5.02, s, OCH₂ and 6.9-7.7, m, ArH

compound 1.66 pale yellow oil ¹H n.m.r. δ (CDCl₃) 0.94, t, J7Hz. CH₃; 1.5-2.1, m, cyclopent H and CH₂CH₃; 2.62, s, COCH₂; 2.94, q, J7Hz, CH₂CH₂CH₃; 5.08, s, OCH₂ and 7.1-7.7, m, ArH

compound 1.70 m.p. 100, ¹H n.m.r. δ (CDCl₃) 0.83, t, J7Hz. CH₃; 13-2.1, m, cyclopent and CH₂CH₃; 2.62, s, COCH₂; 2.94, q, J7Hz, CH₂CH₂CH₃; 5.14, s, OCH₂ and 6.7-7.6, m, ArH compound 1.77 colourless oil, ¹H n.m.r. δ (CDCI₃) 0.80-1.1, m, 2xCH₃; 12-2.2, m, cyclopent H and CH₂CH₂CH₃; 2.61, s, COCH-,; 2.94, q, J7Hz, CH₂CH₂CH₃; 5.06, s, OCH₂ and 6.9-7.4 m, ArH

compound 1.79 pale yellow oil, ¹H n.m.r. δ (CDCl₃) 0.92, t, J7Hz. CH₂CH₃; 1.14, d, J6H

CHCH₃; 13-2.1, m, cyclopent H and CH₂CH₂CH₃; 236, q, J6Hz; CHCH₃; 2.80-3.15, m, CH₂CH₂CH₃; 5.06, s, OCH₂ and 7.2-7.7, m, ArH

compound 1.80 m. p. 69, ¹H n.m.r. δ (CDCl₃) 0.97, t, J7Hz. CH₂CH₃; 125, d, J6Hz,

CHCH₃; 1.4-2.1, m, cyclopent H and CH₂CH₂CH₃ 2.42, q, J6Hz; CHCH₃; 2.85-3.1, m, CH₂CH₂CH₃; 5.05, s, OCH, and 7.1-7.65, m, ArH

compound 1.89 m. p. 109, ¹H n.m.r. δ (CDCl₃) 0.92, t, J7Hz. CH₂CH₃; 1.2, s, 2xCH₃;

13-2.0, m, cyclopent H and CH₂CH₂CH₃; 3.0, t, J7Hz, CH₂CH₂CH₃; 5.08, s, OCH₂ and 7.0-7.7, m, ArH compound 1.95 pale yellow oil, ¹H n.m.r. v(CDCl₃) 0.8-1.1, m, CH₂CH₃ and CHCH₃;

1.4-23, m, cyclopent H, CH₂CH₂CH₃ and CHCH₃; 2.85-3.2, m, CH₂CH₂CH₃; 5.07, s, OCH₂ and

72-7.8, m, ArH

compound 1.97 m. p. 57, ¹H n.m.r. δ (CDCl₃) 0.8-1.1, m, CH₂CH₃ and CHCH₃; 13-2.1, cyclohex H, CH₂CH₂CH₃ and CHCH₃; 2.68, s, COCH₂; 3.0, t, J7Hz, CH₂CH₂CH₃; 5.08, s, OC^ and 6.9-7.7, m, ArH

compound 1.98 m. p. 61, ¹H n.m.r. δ (CDCl₃) 0.%, t, J7Hz. CH₃; 1.1-2.0, m, cydcΛex H and CH₂CH₂CH₃; 2-52, s, COCH₂; 3.0, q, J7Hz, CH₂CH₂CH₃; 5.03, s, OCH₂ and 72-7.7, m, ArH compound 1.99 m. p.107, ¹H n.m.r. δ (CDCl₃) 0.8-1.1, m, CH₂CH₃ and CHCH₃; 12-2 cyclohex H, C^CI^C^ and CHCH₃; 2.50, s, COCH₂; 2.97, t, J7Hz, CH_jCl^C^; 5.05, s, OCH*,

72-7.7, m, ArH

compound 1.100 m. p. 78, ¹H n.m.r. δ (CDCl₃) 0.95, t, J7Hz. CH₃; 1.1-2.0, m, cyclohex and CH₂CH₂CH₃. 2.53, s, COCH₂; 3.04, q, J7Hz, CH₂CH₂CH₃; 5.06, s, OCH₂ and 6.9-7.7, m, ArH compound 1.111 pale yellow oil, ¹H n.m.r. δ (CDCl₃) 0.96, t, J7Hz. CH₃; 12-2.0, m, cyclohept H and CH₂CH₂CH₃; 2.51, broad s, COCH_2; 2.98, t, J7Hz, CH₂CH₂CH₃; 5-03, s- OCH₂ and

6.9-7.7, m, ArH

compound 1.112 colorless oil, ¹H n.m.r. δ (CDCl₃) 0.98, t, J7Hz. CH₂CH₂CH₃; 1.16, d, J6Hz, CHCH₃;13-2.1, m, cyclohept H and CH₂CH₂CH₃; 2.41, q, J6Hz, CHCH₃; 2.98, t, J7Hz, CH₂CH₂CH₃; 5.09, s, OCH₂ and 7.3-7.8, m, ArH

compound 1.113 pale yellow oil, ¹H n.m.r. δ (CDCl₃) 0.96, t, J7Hz. CH₃; 1.2-2.1, m, cyclohept H and CH₂CH₂CH₃; 2.51, broad s, COCH₂; 2.98, q, J7Hz, CH₂CH₂CH₃; 5.03, s, OCH₂ an 6.9-7.7, m, ArH

compound 3.16 colourless oil, ¹H n.m.r. δ (CDCl₃) 0.92, t, J7Hz. CH₃; 1.46s, 2xCH₃; 23 s, COCH₂; 2.95, q, J7Hz, CH₂CH₂CH₃; 5.02, s, OCI₂ and 6.9-7.4, m, ArH

compound 3.25 m. p. 61, 1H n.m.r. δ (CDCl₃) 0.95, t, J7Hz. CH₃; 1.44, s, 2xCH₃; 1.6-2. m, cyclopent H and CH₂CH₃; 2.56, s, COCH₂; 3.0, q, J7Hz, CH₂CH₂CH₃; 4.8, broad s, OCH; 5.02, s, OCH₂ and 6.8-7.4, m, ArH

compound 3.64 pale yellow oil, ¹H n.m.r. δ (CDCl₃) 0.94, t, J7Hz. CH₃; 0.97, s, 3xCH₃;

1.4-3.1, m, CH₂CH₂CH₃ and COCH₂; 5.06, s, OCH₂ and 7.2-7.7, m, ArH

compound 3.66 m.p. 96, ¹H n.m.r. δ (CDCl₃) 0.91, t, J7Hz. CH₃; 1.42, s, 2xCH₃; 1.4-1.8,

CH₂CH₃; 2.51, s, COCH₂; 3.02, q, J7Hz, CH₂CH₂CH₃; 5.04, s, OCH₂ and 7.3-7.7, m, ArH compound 3.67 pale yellow oil ¹H n.m.r. δ (CDCl₃) 0.98, t, J7Hz. CH₃; 1.42, s, 2xCH₃; 1.4-1.8, m, CH₂CH₃; 232, s, COCH₂; 3.02, q, J7Hz, CH₂CH₂CH₃; 5.08, s, OCH₂ and 7.3-7.7, m, ArH compound 3.74 m.p. 82, ¹H n.m.r. δ (CDCl₃) 0.94, t, J7Hz,. CH₃; 1.44, s, 2xCH₃

1.4-1.7, m, CH₂CH₃; 235, s, COCH₂; 2.98, q, J7Hz, CH₂CH₂CH₃; 5.06, s, OCH₂ and 7.0-7.6, m, ArH compound 3.77 pale yellow oil ¹H n.m.r. δ (CDCl₃) 0.97, t, J7Hz. CH₃; 1.42, s, 2xCH₃;

1.4-1.8, m, CH₂CH₃; 233, s, COCH₂; 2.98, q, J7Hz, CH₂CH₂CH₃; 5.08, s, OCH₂ and 7.4-83, m, ArH compound 3.80 m.p. 97, ¹H n.m.r. δ (CDCl₃) 0.86, t, J7Hz. CH₃; 1.45, s, 2xCH₃; 1.4-1.8,

CH₂CH₃; 2.58, s, COCH₂;; 2.95, q, J7Hz, CH₂CH₂CH₃; 5.12, s, OCH₂ and 6.8-7.7, m, ArH. and compound 3.82 m.p. 82, ¹H n.m.r. δ (CDCl₃) 0.98, t, J7Hz,. CH₃; 131, s, CH₃; 134, m,

CH₂CH₃; 2.3-3.1, m, COCH₂ and CH₂CH₂CH₃; 5.02, s, OCH₂ and 7.3-7.7, m, ArH compound 3.84 colourless oil, ¹H n.m.r. δ (CDCl₃) 0.8-1.0, 2t, J7Hz, J7Hz,. 2xCH₃; 1.27, s,

CH₃; 1.4-1.8, m, CH₂CH₃ and CH₂C H₂CH₃ ; 22-2.7, m, COCH₂; 2.97, q, J7Hz, CK₂CH₂CH₃; 5.06, s, OCH₂ and 7.2-7.7, m, ArH

compound 3.94 pale yellow oil, ¹H n.m.r. δ (CDCl₃) 0.8-1.1, m,. CH₂CH₂CH₃ and CH(CH₃₎₂; 13, s, CH₃; 1.53, q, J7Hz, CH₂CH₂CH₃; 1.93, q, J7Hz, CH(CH₃₎₂; 22-3.2, m, COCH₂ and CH₂CH₂CΑ^ 5.07, s, OCH₂ and 73-7.7, m, ArH

compound 3.103 pale yellow oil., ^lH n_m.r. δ (CDα₃) 0.98, t, J7Hz. CH₃; 1.07, d, J6Hz,

CHCH₃; 13, 1.42, s, s, , s, 2xCH₃; 13-1.8, m, CH-_jCH_jO-iy, 23, q, J8Hz, CHCH₃; 3.03, t, J7Hz, CH₂ ^CH₂CH₃; 5.05, s, OCH₂ and 7.0-7.7, m, ArH

compound 3.104 m. p. 57, ¹H n.m.r. δ (CDCl₃) 0.97, t, J7Hz. CH₃; 1.13, 137, s, s, 4xCH₃;

13-1.8, m, CH₂CH₂CH₃. 3.02, t, J7Hz, CH₂CH₂CH₃; 5.06, s, OCH₂ and 6.9-7.7, m, ArH

compound 3.122 pale yellow oil, 1H n_m.r. δ (CDCl₃) 0.9, t,. J7Hz, CH₂CH₂CH₃; 1.35, s,

CH₃; 1.45-1.7, q, J7Hz, CH₂CH₂CH₃; 2.2-3.1, m, CH₂CH₂CH₃; and COCH₂; 3.53, s, 2xOCH₃; 42, s, CH; 5.08, s, OCH, and 7.3-7.7, m, ArH

compound 3.123 colourless oil, ¹H n.m.r. δ (CDCI₃) 0.95, t, J7Hz. CH₂CH₂CH₃; 136, s,

CH₃; 1.45-1.7, q, J7Hz, CH₂CH₂CH₃; 2.2-3.1, m, CH₂CH₂CH₃ and COCH₂; 33, s, 2xOCH₃; 4.18, s, CH; 5.03, s, OCH₂ and 6.9-7.7, m, ArH

compound 3.124 pale yellow oil, ¹H n.m.r. δ (CDCl₃) 0.91, t, J7Hz. CH₂CH₂CH₃; 1.41, s

CH₃; 1.4-1.7, q, J7Hz, CH₂CH₂CH₃; 2.2-3.1, m, CH₂CH₂CH₃ d COCH₂; 332, s, 2xOCH₃; 4.17, s, C 4.98, s, OCH₂ and 6.9-7.5, m, ArH

compound 4.10 pale yellow oil, ^lH njn.r. δ (CDCl₃) 0.96, t, J7Hz. CH₂CH₃; 12-32, m,

CH₂CH₂CH₃ and hetero H; 5.0, s, OCH₂ and 7.2-7.7, m, ArH

compound 4.11 pale yellow oil, ^lH n_m.r. δ (CDCl₃) 0.91, t, J7Hz. CH₂CH₃; 13-32, m,

CH₂CH₂CH₃ and hetero H; 5.04, s, OCH₂ and 6.9-7.7, m, ArH

compound 4.20 pale yellow oil, ¹H n.m.r. δ (CDCl₃) 0.93, t, J7Hz. CH₂CH₃; 12-32, m,

CH₂CH₂CH₃ and hetero H ; 4.96, s, OCH₂ and 6.7-7.5, m, ArH

compound 424 m.p. 114, ¹H n_m.r. δ (CDCl₃) 0.96, t, J7Hz. CH₂CH₃; 13-33, m,

CH₂CH₂CH₃ and hetero H; 5.08, s, OCH₂ and 7.2-7.7, m, ArH

compound 4.30 m. p. 85, ¹H n.m.r. δ (CDCl₃) 0.92, t, J7Hz. CH₂CH₃; 1.2-32, m,

CH₂CH₂CH₃ and hetero H; 5.02, s, OCH₂ and 6.9-7.6, m, ArH

Barnyard grass is one of the most difficult grasses to eliminate from rice crops because of its similarity to rice, currentiy available herbicides do not have satisfacto selectively for barnyard grass in rice crops. To demonstrate the effectiveness of compounds of Formula (1) of the present invention as selective herbicidal agents fo the control of weeds in rice crops, compoimds of Formulae 1.32 and 1.59 of Table 1 were applied to barnyard grass and rice. Compounds according to US 4008067 (Hirono et. al.), and AU560716 (27196/84) (Watson et al ), were also applied to Barnyard grass and rice for comparative purposes. The herbicidal data are shown in Table 4. In this table 0 signifies no effect and 10 signifies plant dead.

As can be seen from Table 4 compounds according to the present invention are clearly superior to prior art compounds at providing selective weed control in rice crops.

Table 4 Comparison of Compounds of this Invention with known compounds

Herbicidal Rating at 0.4 Kg/ Ha

Compound (scale of 0-10, where 10 indicates plant dead)

post-emergent pre-emergent barnyard rice barnyard rice

grass grass 1.32 10 0 10 0

1.59 10 3 10 0

A 9 9 9 6

B 10 9 10 9

C 0 5 0 0

Disclosure of Hirono et al ;

A: 8-(1-allyloxyaminobutylidine)-6,10-dioxaspiro[4.5]decene-7,9-dione

B : 9-(1-allyloxyaminobutylidine)-7,11-dioxaspiro[5.5]-4- methylundecene-8,10-dione

Disclosure of Watson et al;

C: 3-(1-allyloxyiminobutyl)-6-(4-chlorophenyl)-4-hydroxypyran-2-one To further demonstrate the effectiveness of compounds of Formula (1) of the pr invention as herbicidal agents, compounds of Formula (1) listed in Tables 1-4 we applied to bamyardgrass and rice post-emergent at 0.1 kg/hectare and 0.4 kg/hec The herbicidal data are shown in Table 5 In the table 0 signifies no effect and 10 signifies plant dead. As can be seen the compounds of Formula (1) selectively control barnyardgrass in rice.

Table 5

Compound Bamyardgrass Rice Barnyardgrass Rice tables 1-4 (0.1 Kg/Ha) (0.4 Kg/Ha)

1.32 9 0 10 0

1.33 4 0 8 1

1.34 9 3 10 1

1.52 3 1 9 2

1.56 8 0 10 1

1.58 8 4 9 5

1.59 9 1 10 3

1.63 10 1 10 1

1.77 5 0 10 2

1.95 6 0 10 3

1.99 1 0 10 0

1.111 9 0 10 1

1.113 10 2 10 3

3.16 6 0 10 2

3.66 6 0 9 2

3.67 9 0 9 1

3.74 2 0 10 5

3.82 ft 0 7 0

3.94 6 0 10 3

3.122 9 0 10 2

3.124 8 1 10 2

3.127 9 1 10 1

4.10 10 0 10 0

4.11 10 2 10 4

4.24 9 0 10 1

4.30 9 2 10 2

Claims

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:

1. Compounds of the formula (1) and isomeric and/or tautomeric forms thereof:

wherein

A is a C₁-C₃ alkylene or C₁-C₄ alkenylene group optionally substituted with 1-4 C₁-C₃ alkyl substituents;

X is O, S, SO, SO₂, NR¹⁰ or a single bond;

R¹ is H, C₁-C₄ alkyl, C₁-C₄ alkenyl, C₂-C₄ alkynyl, C₅-C₆ cycloalkyl, C₅-C₆ cycloalkeny C_j-C,, alkylcarbonyl, phenylcarbonyl, phenyl optionally substituted with 1-3 substituents selected from the group consisting of halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄ alkylthio, nitro, cyano, C₁-C₄ haloalkyl, amino, and CfQ, haloalko

C₁-C₄ alkylsulfonyl, benzenesulfonyl, C₁-C₄ alkylcarbonyl, C₂-C₈ alkoxyalkyl, C₂-C₈ alkylthioalkyl, C₁-C₁₀ phenylalkyl or M;

R² is C₁-C₄ alkyl, C₁-C₄ alkenyl, C₂-C₆ alkynyl, C₁-C₄ haloalkyl, C₁-C₄ alkylthio, C₁-C₄ cycloalkyl, C₅-C₆ cycloalkenyl, phenyl optionally substituted with 1-3 substituents selected from the group consisting of halogen, C₁-C₄ alkyl, C₁-C₄ alkylthio, nitro, cyano, C₁-C₄ haloalkyl, amino, and C₁-C₄ haloalkoxy, C₂-C₈ alkoxyalkyl, C₂-C₈ alkylthioalkyl, or C₁-C₄ alkyl substituted with a substituent selected from the grou consisting of phenyl, phenoxy and thiophenoxy wherein the aromatic ring of said substituents may be substituted with 1-3 substituents selected from halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄ alkylthio, nitro, cyano, amino, C₁-C₄ haloalkyl and C₁-C₄ haloalkoxy;

R³ and R⁴ are independently H or C₁-C₄ alkyl; R⁵ and R* are independently H, C₁-C₄ alkyl, C₁-C₄ alkenyl, C₁-C₄ alkylthioalkyl,

C₁-C₄ haloalkyl, C₁-C₄ haloalkenyi or C₁-C₄ cycloalkyl wherein the alkyl, alkeny and cycloalkyl groups are optionally substituted with 1-3 substituents selected the group consisting of OR¹², NR¹³R¹⁴, NR¹⁵C(O)(C₁-C₄ alkyl), NR¹⁸SO₂C₁-C₄ alkyl), NR²¹C(O)(C₁-C₄ alkyl), C(OR¹⁶)(OR¹⁷)R²², C(SR¹⁹)(SR²⁰)R²³, C₁-C₄ alkoxycarbonyl and phenyl which may be substituted with a substituent selected from halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄ alkylthio, nitro, cyano, C₁-C₄ haloalkyl and C₁-C₄ haloalkoxy;

OR

R⁵ and R⁶ together with the carbon to which they are attached form a fully

saturated or an unsaturated 3- to 7-membered carbocyclic ring, or a fully satura or an unsaturated 5- to 7-membered heterocyclic ring containing 1-3 heteroato selected from the group consisting of 0-3 nitrogen, 0-2 oxygen and 0-2 sulfur atoms; said ring may be substituted with 1-4 substituents selected from the grou consisting of halogen, C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₂-C₄ alkenyl, C₂-C₄ alkynyl,

C₁-C₄ alkylcarbonyl, C₁-C₄ alkoxy, C₁-C₄ alkylthio, C₁-C₄ alkoxycarbonyl, -COOH

C₂-C₈ alkoxyalkyl, C₂-C₈ alkylthioalkyl, and phenyl which is optionally substitute with a substituent selected from halogen, C₁-C₄ alkoxy, C₁-C₄ alkylthio, C₁-C₄ haloalkyl, nitro, cyano and C₁-C₄ haloalkoxy; one of the carbon atoms of said ri may be in the form of a carbonyl group or its corresponding dimethyl, diethyl or ethylene or propylene ketal;

R⁷, R⁸ and R⁹ are independently H, halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄

alkylthio, C₁-C₄ alkylsulfinyl, C₁-C₄ alkylsulfonyl, C₁-C₄ haloalkyl, C₁-C₄ haloalkoxy, nitro, cyano, C₁-C₄ alkoxycarbonyl, C₁-C₄ alkylaminocarbonyl, C₂-C₆ dialkylaminocarbonyl, aminocarbonyl; amino; C₁-C₄ alkylamino, C₂-C₆ alkylamin or benzenesulfonyl, benzoyl, benzyl, benzyloxy, pyridyl, phenoxy, phenylthio, phenylamino or phenyl group said group optionally substituted with 1-3 substituents selected from the group consisting of halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, and CF₃; provided that when both R⁵ and R⁶ are independentiy C₁-C₄ alkyl, C₁-C₄ alkenyl,

C₂-C₆ alkylthioalkyl, C₁-C₄ haloalkyl, C₂-C₄ haloalkenyi or C₃-C₆ cycloalkyl optionally substituted with a substituent selected from the group consisting of

C₁-C₄ alkoxycarbonyl and phenyl which may be substituted with a substituent selected from halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₁-C₄ alkylthio, nitro, cyano,

C₁-C₄ haloalkyl and C₁-C₄ haloalkoxy, or when R⁵ and R⁶ together form an optionally substituted saturated or unsaturated carbocyclic or heterocyclic ring then at least one of R⁷, R⁸, or R⁹ is an optionally substituted benzenesulfonyl, benzoyl, benzyl, benzyloxy, pyridyl, phenoxy, phenylthio or phenylamino group, or at least one of R⁷, R⁸ or R⁹ is phenyl substituted with 1-3 substituents selected from the group consisting of halogen, C₁-C₄ alkyl,

C₁-C₄ alkyl, C₁-C₄ alkoxy and CF₃;.

R¹⁰ is H, C₁-C₄ alkyl or phenyl optionally substituted with 1-3 substituents selected from the group consisting of halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy,

C₁-C₄ alkylthio, C₁-C₄ haloalkyl and C₁-C₄ haloalkoxy;

M is Li⁺, Na⁺, K⁺, NH₄ ⁺, or N(R ¹¹)₄ ⁺ where R¹¹ is C₁-C₄ alkyl;

R¹² is H, C₁-C₄ alkyl, C(O)(C₁-C₄ alkyl)or CO₂(C₁-C₄ alkyl);

R¹³, R¹⁵, R¹⁸, R²¹, R²² and R²³ are independentiy H or C₁-C₄ alkyl;

R¹⁴, R¹⁶, R¹⁷, R¹⁹ and R²⁰ are independentiy C₁-C₄ alkyl;

R¹⁶ and R¹⁷ taken together may be -(CH₂)₂- or -(CH₂)₃-; and

R¹⁹ and R²⁰ taken together may be -(CH₂)₂- or -(CH₂)₃-.

2. Compounds of formula (1) characterised in that

R¹ is H or M; and

R² is C₁-C₄ alkyl, C₁-C₄ haloalkyl, C₁-C₄ alkenyl or C₂-C₄ alkynyl .

3. Compounds as claimed in Claim 2, characterised in that

A is C₁-C₄ alkylene or C₁-C₄ alkenylene optionally substituted with CH₃ or C₂H₅

R⁷, R⁸ and R⁹ are independentiy H, CI, Br, F, C₁-C₃ alkyl, C₁-C₃ alkoxy, C₁-C₄ alkylthio, C₁-C₃ haloalkyl, C₁-C₃ haloalkoxy, nitro, cyano or C₁-C₄ alkoxycarbon or benzenesulfonyl, benzoyl, benzyl, benzyloxy, phenoxy, phenylthio or phenylamino optionally substituted with 1-3 substituents selected from the gro consisting of halogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, or CF₃;

provided that at least one of R⁷, R⁸, or R⁹ is an optionally substituted benzenesulfonyl, benzoyl, benzyl, benzyloxy, phenoxy, phenyl, phenylthio or phenylamino group; and

R¹⁰ is H or CH₃.

4. Compounds as claimed in Claim 3, characterised in that X is O.

5. Compounds as claimed in Claim 3, characterised in that X is S, SO or SO₂.

6. Compounds as claimed in Claim 3, characterised in that X is NR¹⁰, as defined Claim 1.

7. Compounds as claimed in Claim 3, characterised in that X is a single bond.

8. Compounds as claimed in Claim 7, characterised in

A is -CH₂-, -CH₂CH₂- or -CH₂CH = CH- ;

R¹ is H, Li+, Na+, or K+;

R² is CH₃, QH₅, n- C₂H₇ or n- C₄H₉ ;

R³ and R⁴ are independentiy H, CH₃ or C₂H₅ ; and

R⁷, R⁸ and R⁹ are independentiy H, CI, Br, F, CH₃, QH₅, OCH₃, OQH₅,

SCH₃, SC₂H₅, CF₃, CHF₂, CF₂CF₃, OCHF₂, OCF₃, OCH₂CF₃, NO₂, CN

CO₂CH₃, Ph, SO₂Ph, COPh, CH₂Ph, OCH₂Ph, OPh, SPh, NHPh or N(Me)Ph provided that at least one of R⁷, R⁸, or R⁹ is an optionally substituted benzenesulfonyl, benzoyl, benzyl, benzyloxy, phenoxy, phenyl, phenylthio or phenylamino group.

9. Compounds as claimed in Claim 7, characterised in that R⁵ and R⁶ are

independentiy C₁-C₄ alkyl, C₂-C₄ alkenyl, C₂-C₄ alkynyl, C₁-C₄ alkylthio or

C₂-C₆ alkylthioalkyl.

10. Compounds as claimed in Claim 7, characterised in that R⁵ and R⁶ together with the carbon to which they are attached form a saturated or unsaturated 5-, 6- or 7-membered carbocyclic ring which is optionally substituted with 1-4 CH₃ groups.

11. Compounds as claimed in Claim 10, characterised in that

A is -CH₂-, -CH₂CH₂- or CH₂CH = CH- ;

R¹ is H, Li + , Na+ or K+ ;

R² is CH₃, QH₅, n-QH₇ or n-QH₉;

R³ and R⁴ are independentiy H or CH₃; and

R⁷, R⁸ and R⁹ are independentiy H, CI, Br, F, CH₃, QH₅, OCH₃, OC₂H₅,

SCH₃, SC₂H₅, CF₃, CHF₂ CF₂CF₃, OCHF₂, OCF₃, OCH₂CF₃, NO₂, CN,

CO₂CH₃, Ph, SO₂Ph, COPh, CH₂Ph, OCH₂Ph, OPh, SPh, NHPh or N(Me)Ph provided that at least one of R⁷, R⁸, or R⁹ is an optionally substituted

benzenesulfonyl, benzoyl, benzyl, benzyloxy, phenoxy, phenyl, phenylthio or phenylamino group.

12. Compounds as claimed in Claim 7, characterised in that

R⁵ and R⁶ together with the carbon to which they are attached form a

saturated or unsaturated 5-, 6- or 7-membered heterocyclic ring containing 1-2 heteroatoms selected from the group consisting of 0-2 nitrogen, 0-1 oxygen and 0-2 sulfur atoms; said ring is optionally substituted with 1-4 CH₃ groups.

13. Compounds as claimed in Claim 12, characterised in that

A is -CH₂-, -CH₂CH₂- or -CH₂CH = CH- ;

R¹ is H, Li + , Na+ or K+ ;

R² is CH₃ C₂H₅, n-C₃H₇ or n-QH₉;

R³ and R⁴ are independently H, CH₃ or QH₅ ; and

R⁷, R⁸ and R⁹ are independently H, CI, Br, F, CH₃, QH₅, OCH₃, OC₂H₅, SCH₃, SC₂H₅, CF₃, CHF₂, CF₂CF₃, OCHF₂, OCF₃, OCH₂CF₃, NO₂, CN, CO₂CH₃, Ph,

SO₂Ph, COPh, CH₂Ph, OCH₂Ph, OPh, SPh, NHPh or N(Me)Ph provided that at least one of R⁷, R⁸, or R⁹ is an optionally substituted benzenesulfonyl, benzoyl benzyl, benzyloxy, phenoxy, phenyl, phenylthio or phenylamino group.

14. 9-hydroxy-8-[ 1-((3-(phenoxy)phenyl)methoxyimino)butyl]-6- oxaspiro[4.5]dec-8-en-7-one.

15. 8-[ 1-((4-(4-fluorophenyl)phenyl)methoxyimino)butyl]-9-hydroxy-6- oxaspiro[4.5]dec-8-en-7-one.

16. 9-hydroxy-8-[ 1-((4-(phenyl)phenyl)methoxyimino)butyl]-6- oxaspiro[4.5]dec-8-en-7-one.

17. 6,6-dimethyl-4-hydroxy-3-(l-((4-(phenyl)phenyl)methoxyimino)butyl)pyran-2- one.

18. 6,6-dimethyl3-(l-((4-(4-fluorophenyl)phenyl)methoxyimino)butyl)-4- hydroxypyran-2-one.

19. Any one of the compounds listed in the foregoing of Tables 1 to 4.

20. A plant growth inhibiting, plant damaging, or plant killing composition characterised in that it comprises a compound of formula (1), as defined in Claim 1 and an inert carrier therefor.

21. A method for regulating the growth of a plant, characterised in that there applied to the plant, to the seed of the plant, or to the growth medium of the plant, an effective amount of a compound of formula (1), as defined in Claim 1.

22. A method for selectively inhibiting, damaging or killing weed grasses in a broad-leaf crop, characterised in that there is applied to the crop or its locus an effective amount of a compound of formula (1), as defined in Claim 1.

23. A herbicidal composition characterised in that it comprises a compound formula (1), as defined in Claim 1, and at least one other herbicide.

24. A plant growth regulating composition characterised in that it comprises compound of formula (1), as defined in Claim 1, and an inert carrier therefor.

25. The use of a compound of formula (1) as herbicide or plant growth regulator.