EP0102066A1
Expired / Lapsed
EP
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Process for preparing 2-cyclopentenone esters
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1983-08-25
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Granted: —
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Expires: 2003-08-25
Abstract
Abstract Described are 2-cyclopentenone esters of the formula: wherein R' is hydrogen, lower alkyl or lower alkenyl, R 2 is lower alkyl, lower alkenyl, lower alkynyl, cycloalkyl, cycloalkenyl or substituted or unsubstituted aryl and R 3 is hydrogen or lower alkyl. They are prepared in high yields by reacting the corresponding racemic or optically active 4-cyclopentenone of the formula: wherein R 1 and R 2 are each as defined above and R is hydrogen or an acyl group with at least one lower aliphatic carboxylic acid and/or its metal- and/or amine salt.
Inventors
- 👤 Masayoshi Minai
- 👤 Tadashi Katsura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:07
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/10; C07C67/08; C07C67/28; C07C67/293; C07C2601/00; C07C2601/06; C07C2601/10; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
87 words
A process for preparing 2-cyclopentenone esters of the formula: wherein R 1 is hydrogen, lower alkyl or lower alkenyl, R 2 is lower alkyl, lower alkenyl, lower alkynyl, cycloalkyl, cycloalkenyl or substituted or unsubstituted aryl and R 3 is hydrogen or lower alkyl, which comprises reacting a racemic or optically active 4-cyclopentenone of the formula: wherein R 1 and R 2 are each as defined above and R is hydrogen or an acyl group with at least one lower aliphatic carboxylic acid and/or its metal-and/or amine salt.
Claim 2
Dependent Claim
87 words
A process for preparing 2-cyclopentenone esters of the formula: wherein R 1 is hydrogen, lower alkyl or lower alkenyl, R 2 is lower alkyl, lower alkenyl, lower alkynyl, cycloalkyl, cycloalkenyl or substituted or unsubstituted aryl and R 3 is hydrogen or lower alkyl, which comprises reacting a racemic or optically active 4-cyclopentenone of the formula: wherein R 1 and R 2 are each as defined above and R is hydrogen or an acyl group with at least one lower aliphatic carboxylic acid and/or its metal-and/or amine salt.
Claim 3
Dependent Claim
21 words
The process according to claim 1, wherein at least one lower aliphatic acid and its metal salt are used in combination.
Claim 4
Dependent Claim
29 words
The process according to claim 1 or 2, wherein the lower aliphatic carboxylic acid is one chosen from formic acid, acetic acid, propionic acid, butyric acid and valeric acid.
Claim 5
Dependent Claim
34 words
The process according to claim 1 or 2, wherein the metal salt of the lower aliphatic carboxylic acid is one chosen from lithium, sodium, potassium, calcium, copper, zinc, palladium, lead, tin and manganese salts.
Claim 6
Dependent Claim
27 words
The process according to claim 1, wherein the amine salt of the lower aliphatic carboxylic acid is one chosen from trimethylamine, triethylamine, pyridine and picolic acid salts.
Claim 7
Dependent Claim
15 words
The process according to claim 1, wherein the reaction temperature is from 30 to 160°C.
References Cited (Backward Citations)
US4229592A
Cited
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