IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0825150
(1992-01-24)
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발명자
/ 주소 |
- Patil Deepak R. (Orangeburg SC) Choudhury Azfar A. (Orangeburg SC) Kadkhodayan Abbas (Orangeburg SC)
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출원인 / 주소 |
- Ethyl Corporation (Richmond VA 02)
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인용정보 |
피인용 횟수 :
7 인용 특허 :
0 |
초록
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A method for racemizing an optically active carboxylic acid, or ester thereof, of the formula: [Figure] I where R1 is hydrogen or C1 to C6 linear or branched alkyl; R2, R3 and R4 are different and are hydrogen or C1 to C6 linear or branched alkyl, C1 to C6 linear or branched haloalkyl, aralkyl, cycl
A method for racemizing an optically active carboxylic acid, or ester thereof, of the formula: [Figure] I where R1 is hydrogen or C1 to C6 linear or branched alkyl; R2, R3 and R4 are different and are hydrogen or C1 to C6 linear or branched alkyl, C1 to C6 linear or branched haloalkyl, aralkyl, cycloalkyl, alkyl substituted cycloalkyl, C6 to C10 aryl, C1 to C6 linear or branched alkoxy, C6 to C10 aryloxy, C1 to C6 alkylthio, C2 to C8 cycloalkylthio, C6 to C10 arylthio, C6 to C10 arylcarbonyl, C4 to C8 cycloalkenyl, trifluoromethyl, halo, C4 to C5 heteroaryl, C10 to C14 aryl, or biphenyl unsubstituted or substituted with methyl or halo, comprising heating said optically active carboxylic acid or ester thereof in the presence of water at a temperature of from about 75°C. to about 200°C. in the presence of a catalytically effective amount of an aliphatic, aromatic or mixed aliphatic and aromatic tertiary amine for a time sufficient to racemize said carboxylic acid or ester thereof.
대표청구항
▼
A method for racemizing an optically active carboxylic acid, or ester thereof, of the formula: [Figure] I where R1 is hydrogen or C1 to C6 linear or branched alkyl; R2, R3 and R4 are different and are hydrogen or C1 to C6 linear or branched alkyl, C1 to C6 linear or branched haloalkyl, aralkyl, cycl
A method for racemizing an optically active carboxylic acid, or ester thereof, of the formula: [Figure] I where R1 is hydrogen or C1 to C6 linear or branched alkyl; R2, R3 and R4 are different and are hydrogen or C1 to C6 linear or branched alkyl, C1 to C6 linear or branched haloalkyl, aralkyl, cycloalkyl, alkyl substituted cycloalkyl, C1 to C6 linear or branched alkoxy, C6 to C10 aryloxy, C1 to C6 alkylthio, C2 to C8 cycloalkylthio, C6 to C10 arylthio, C6 to C10 arylcarbonyl, C4 to C8 cycloalkenyl, trifluoromethyl, halo, C4 to C5 heteroaryl, or C6 to C14 aryl, comprising heating an aqueous solution of said optically active carboxylic acid or ester thereof at a temperature of from about 75°C. to about 200°C. in the presence of a catalytically effective amount of an aliphatic, aromatic or mixed aliphatic and aromatic tertiary amine for a time sufficient to racemize said carboxylic acid or ester thereof.
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