WO2000044732A1 - Process for the preparation of 4,4'-bis(2-benzoxazolyl)stilbenes - Google Patents
Process for the preparation of 4,4'-bis(2-benzoxazolyl)stilbenes Download PDFInfo
- Publication number
- WO2000044732A1 WO2000044732A1 PCT/EP2000/000277 EP0000277W WO0044732A1 WO 2000044732 A1 WO2000044732 A1 WO 2000044732A1 EP 0000277 W EP0000277 W EP 0000277W WO 0044732 A1 WO0044732 A1 WO 0044732A1
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- WIPO (PCT)
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- compound
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D263/00—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings
- C07D263/52—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings condensed with carbocyclic rings or ring systems
- C07D263/62—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings condensed with carbocyclic rings or ring systems having two or more ring systems containing condensed 1,3-oxazole rings
- C07D263/64—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings condensed with carbocyclic rings or ring systems having two or more ring systems containing condensed 1,3-oxazole rings linked in positions 2 and 2' by chains containing six-membered aromatic rings or ring systems containing such rings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/35—Heterocyclic compounds having nitrogen in the ring having also oxygen in the ring
- C08K5/353—Five-membered rings
Definitions
- the present invention relates to the preparation of 4,4'-bis(2-benzoxazolyl)stilbenes and to the use of these compounds as optical brighteners in polymeric materials.
- the compound of formula (5) is then reacted with a strong base to give the compound of formula (1).
- the compound of formula (4) is then reacted by ring-closure to give the compound of formula (5). That compound (5) is then reacted with a strong base to give the compound of formula (1).
- R ⁇ is hydrogen; C C 8 alkyl; -CO 2 R 2 ; -NHCOR 2 or -OR 2 ; and
- R 2 is C r C 4 alkyl.
- CrOjAlkyl and C C 8 alkyl are straight-chain or branched alkyl radicals, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, amyl, isoamyl, tert-amyl, hexyl, heptyl, octyl or isooctyl.
- novel process of preparation preferably relates to compounds of formula (1), wherein R T is hydrogen; or CrC 5 alkyl.
- reaction of the 4-(chloromethyl)benzoyl chloride (compound of formula (2)) with the un- substituted or substituted 2-aminophenol (compound of formula (3)) to the 2-[4-(chlorome- thyl)phenyl]benzoxazole (compound of formula (5), 1 st step of process (a)) can be carried out in different solvents and by addition of different condensing agents.
- Suitable solvents are organic solvents which are inert under the given reaction conditions.
- Suitable solvents are, for example, aromatic and aliphatic hydrocarbons, such as nitrobenzene, chlorobenzene, o-dichlorobenzene, 1 ,2,3-trimethylbenzene, toluene, xylene, xylene isomer mixtures, tetrahydronaphthalene, ⁇ -chloronaphthalene, acetylene tetrachloride, ethylene dichloride or polyphosphoric acid, and the like.
- Suitable condensing agents are preferably boric acid, polyphosphoric acid, sulfuric acid or toluenesulfonic acid.
- the reaction can be carried out in a wide temperature range from 80 to 200, preferably from 100 to 150°C.
- the reaction is preferably carried out at the boiling temperature of the respective solvent used.
- the reaction is preferably continued until the HCI-evolution is finished.
- the reaction mixture is then allowed to cool to room temperature, after which the condensing agent is added and the mixture is refluxed until the elimination of water is complete.
- the compound of formula (5) is worked up in customary manner by distilling the solvent and suspending the residue for a prolonged period of time, usually over 6 to 24 hours, in a suitable suspension agent, for example sodium hydrogencarbonate solution.
- a suitable suspension agent for example sodium hydrogencarbonate solution.
- the residue is then collected by filtration, washed with water and dried under vacuum at elevated temperature.
- the reaction of the 4-(chloromethyl)benzoyl chloride with the unsubstituted or substituted 2- aminophenol (compound of formula (3)) to the N-(2-hydroxyphenyl)-4-(chloromethyl)benz- amide (compound of formula (4); 1 st step of process (b)) is preferably carried out in N,N-di- methylacetamide.
- the product is precipitated by addition of water.
- the ring-closure reaction to give the compound of formula (5) (2 nd step of process (b)) is then carried out by elimination of water in one of the above-mentioned inert organic solvents and condensing agents, preferably in p-xylene and p-toluenesulfonic acid.
- the preparation of the stilbene end products of formula (1) is preferably carried out in an anhydrous, aprotic, polar solvent, preferably in NMP, DMA, DMF or DMSO.
- Dimethylform- amide (DMF) is very particularly preferred.
- the dimerisation is carried out under alkaline conditions by addition of sodium hydroxide, potassium hydroxide or alcoholates, which are usually added in two- to four-fold excess, based on the chloromethyl compound.
- the alkali hydroxide is usually added in powder form.
- the reaction is usually carried out at room temperature until the entire amount of the organically bound chlorine is reacted.
- the reaction usually takes from 6 to 12 hours.
- the reaction mixture is acidified with an acid, for example with an anhydrous organic acid, such as glacial acetic acid or, preferably, with a HCI/H 2 O mixture.
- an acid for example with an anhydrous organic acid, such as glacial acetic acid or, preferably, with a HCI/H 2 O mixture.
- the reaction mixture is heated to boiling to dissolve the by-products and is then subjected to hot suction filtration.
- the product is then washed with solvents and water until no chloride ions can be found anymore in the washing water. After drying, the analytically pure stilbene compound is obtained.
- the compounds of formula (1 ) are very suitable for use as optical brighteners for organic polymeric materials. Accordingly, this invention also relates to a process for optically brightening organic polymers, which comprises admixing at least one compound of formula (1 ) to these materials.
- Suitable polymers are in particular polyesters derived from dicarboxylic acids and dialcohols and/or from hydroxycarboxylic acids or from the corresponding lactones, for example polyethylene terephthalate (PET), polybutylene terephthalate, poly-1 ,4-dimethylolcyclohexane terephthalate, polyhydroxybenzoate, and block-polyether-esters derived from polyethers containing hydroxyl terminal groups; as well as polyesters modified with polycarbonates or MBS.
- PET polyethylene terephthalate
- polybutylene terephthalate poly-1 ,4-dimethylolcyclohexane terephthalate
- polyhydroxybenzoate polyhydroxybenzoate
- block-polyether-esters derived from polyethers containing hydroxyl terminal groups
- the amount of the optical brightener of formula (1) added depends on the respective substrate used and on its envisaged end use. Sufficient amounts are usually from 0.01 to 5 % by weight, preferably from 0.01 to 3 % by weight, based on the polymer to be brightened. According to this invention, suitable polymers are in particular those comprising 0.01 to 5 % by weight, preferably 0.01 to 3 % by weight, of at least one compound of formula (1).
- the compounds of formula (1 ) and possible further additives are added to the polymers in the spinning mass, i.e. before or while the polymers are being moulded, for example by blending in powder form or by addition to the melt or solution of the polymer.
- the polymers stabilised in this manner can be used in a very wide range of forms, for example as fibres, foils, filaments, profiles, hollow articles or sheets.
- a 350 ml sulfonation flask is charged with 80 ml of DMF, and 8.9 g (0.03 mol) of the compound of formula (102) are then added under nitrogen. At 15 to 20°C, 4.2 g (0.075 mol) of potassium hydroxide are added. The reaction mixture turns somewhat dark and is stirred for 1 h at 15 to 20°C and then heated for 1 h to 35 to 40°C. The reaction mixture is adjusted to pH 3 with 20 ml of HCI/water (1 :1 mixture). A yellow precipitate is obtained which is subjected to filtration, washed with methanol and water and then dried under vacuum at 80°C.
- a 750 ml sulfonation flask is charged with 250 ml of xylene and 92.25 g (0.75 mol) of 2- amino-p-cresol. 144.58 g (0.765 mol) of 4-(chloromethyl)-benzoyl chloride are then added dropwise over 1 h. This mixture is heated to 90°C, slight evolution of HCI taking place. Upon heating the mixture to 110°C, the evolution of HCI becomes stronger and then stops after about 2 h.
- the structure corresponds to the NMR analysis.
- a 350 ml sulfonation flask is charged with 80 ml of DMF. 4.45 g (0.015 mol) of the compound of formula (102) and 3.86 g (0.015 mol) of the compound of formula (105) are added thereto under nitrogen and are dissolved at 40°C. The solution is cooled to 15 to 20°C and charged with 8.4 g (0.075 mol) of potassium tertiary butylate. The solution turns dark and is stirred for 1 h at 15 to 20°C. The pH is adjusted to 3 with 15 ml of water/HCI (1:1 mixture). A yellow precipitate is obtained which is subjected to filtration and washed with methanol and finally with water. The product is then dried under vacuum at 80°C.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000595988A JP2002535393A (en) | 1999-01-27 | 2000-01-15 | Method for producing 4,4'-bis (2-benzoxazolyl) stilbene |
AU25417/00A AU2541700A (en) | 1999-01-27 | 2000-01-15 | Process for the preparation of 4,4'-bis(2-benzoxazolyl)stilbenes |
EP00903579A EP1153018A1 (en) | 1999-01-27 | 2000-01-15 | Process for the preparation of 4,4'-bis(2-benzoxazolyl)stilbenes |
KR1020017009331A KR20010101674A (en) | 1999-01-27 | 2000-01-15 | Process for the preparation of 4,4'-bis(2-benzoxazolyl)stilbenes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99810067 | 1999-01-27 | ||
EP99810067.1 | 1999-01-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000044732A1 true WO2000044732A1 (en) | 2000-08-03 |
Family
ID=8242652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/000277 WO2000044732A1 (en) | 1999-01-27 | 2000-01-15 | Process for the preparation of 4,4'-bis(2-benzoxazolyl)stilbenes |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1153018A1 (en) |
JP (1) | JP2002535393A (en) |
KR (1) | KR20010101674A (en) |
CN (1) | CN1337954A (en) |
AU (1) | AU2541700A (en) |
WO (1) | WO2000044732A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8740997B2 (en) | 2010-05-18 | 2014-06-03 | Milliken & Company | Optical brighteners and compositions comprising the same |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6202492B2 (en) * | 2012-08-03 | 2017-09-27 | 東レ・ファインケミカル株式会社 | Method for producing dinitro compound |
CN112794827A (en) * | 2020-12-31 | 2021-05-14 | 杭州劲瑞新材料有限公司 | High-weather-resistance and aging-resistance grafted dibenzoxazole stilbene type fluorescent whitening agent and preparation method thereof |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1063797A (en) * | 1963-11-14 | 1967-03-30 | Ciba Ltd | Bis-oxazolyl-stilbene compounds and process for their manufacture |
DE2044991A1 (en) * | 1970-09-11 | 1972-03-16 | Farbenfabriken Bayer Ag, 5090 Leverkusen | Coumarin dyes - made by aldol condensn for colouring synthetic fibres, films, paints, plastics, etc |
DE2756883A1 (en) * | 1976-12-23 | 1978-06-29 | Ciba Geigy Ag | NEW BENZOXAZOLE COMPOUNDS |
EP0116942A1 (en) * | 1983-02-18 | 1984-08-29 | Hoechst Aktiengesellschaft | Method to prepare 4,4'-bis-benz-ox(thi, -imid)-azol-2-yl stilbenes |
-
2000
- 2000-01-15 AU AU25417/00A patent/AU2541700A/en not_active Abandoned
- 2000-01-15 CN CN00803137A patent/CN1337954A/en active Pending
- 2000-01-15 WO PCT/EP2000/000277 patent/WO2000044732A1/en not_active Application Discontinuation
- 2000-01-15 KR KR1020017009331A patent/KR20010101674A/en not_active Application Discontinuation
- 2000-01-15 EP EP00903579A patent/EP1153018A1/en not_active Withdrawn
- 2000-01-15 JP JP2000595988A patent/JP2002535393A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1063797A (en) * | 1963-11-14 | 1967-03-30 | Ciba Ltd | Bis-oxazolyl-stilbene compounds and process for their manufacture |
DE2044991A1 (en) * | 1970-09-11 | 1972-03-16 | Farbenfabriken Bayer Ag, 5090 Leverkusen | Coumarin dyes - made by aldol condensn for colouring synthetic fibres, films, paints, plastics, etc |
DE2756883A1 (en) * | 1976-12-23 | 1978-06-29 | Ciba Geigy Ag | NEW BENZOXAZOLE COMPOUNDS |
EP0116942A1 (en) * | 1983-02-18 | 1984-08-29 | Hoechst Aktiengesellschaft | Method to prepare 4,4'-bis-benz-ox(thi, -imid)-azol-2-yl stilbenes |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8740997B2 (en) | 2010-05-18 | 2014-06-03 | Milliken & Company | Optical brighteners and compositions comprising the same |
Also Published As
Publication number | Publication date |
---|---|
JP2002535393A (en) | 2002-10-22 |
AU2541700A (en) | 2000-08-18 |
KR20010101674A (en) | 2001-11-14 |
EP1153018A1 (en) | 2001-11-14 |
CN1337954A (en) | 2002-02-27 |
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