JPS5788142A - Preparation of cyclopentenolone compound - Google Patents
Preparation of cyclopentenolone compoundInfo
- Publication number
- JPS5788142A JPS5788142A JP16437280A JP16437280A JPS5788142A JP S5788142 A JPS5788142 A JP S5788142A JP 16437280 A JP16437280 A JP 16437280A JP 16437280 A JP16437280 A JP 16437280A JP S5788142 A JPS5788142 A JP S5788142A
- Authority
- JP
- Japan
- Prior art keywords
- compound
- methyl
- water
- aqueous solvent
- formulai
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: To prepare the titled compound useful as an intermediate of pesticides and pharmaceuticals, in a short time, in high yield without producing by-products, by using a specific compound such as 4-hydroxy-4-methyl-5-allyl-2-cyclopentenone as a raw material, and heating in an aqueous solvent.
CONSTITUTION: The objective compound of formula III is prepared from the compound of formulaI(R1 is ≤6C alkyl, alkenyl, alkynyl or group of formula II; R2 is H, methyl or halogen) e.g. 4-hydroxy-4-methyl-5-propargyl-2-cyclopentenone, by heating the compound in an aqueous solvent pref. at 150W200°C. The aqueous solvent is water, or an aqueous mixture of a water-insoluble organic solvent such as toluene or a water-soluble organic solvent such as acetone, and its amount is 0.5W100 times weight, pref. 5W40 times weight of the compound of formulaI.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16437280A JPS5788142A (en) | 1980-11-20 | 1980-11-20 | Preparation of cyclopentenolone compound |
US06/256,570 US4347386A (en) | 1980-04-30 | 1981-04-22 | Process for preparing cyclopentenolones |
HU111681A HU188043B (en) | 1980-04-30 | 1981-04-29 | Process for producing cyclopentenolene derivatives |
DK190981A DK151796C (en) | 1980-04-30 | 1981-04-29 | PROCEDURE FOR THE PREPARATION OF CYCLOPENTENOLONS |
DE8181103288T DE3161108D1 (en) | 1980-04-30 | 1981-04-30 | Process for preparing cyclopentenolones |
EP19810103288 EP0039089B1 (en) | 1980-04-30 | 1981-04-30 | Process for preparing cyclopentenolones |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16437280A JPS5788142A (en) | 1980-11-20 | 1980-11-20 | Preparation of cyclopentenolone compound |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5788142A true JPS5788142A (en) | 1982-06-01 |
JPS6254416B2 JPS6254416B2 (en) | 1987-11-14 |
Family
ID=15791878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16437280A Granted JPS5788142A (en) | 1980-04-30 | 1980-11-20 | Preparation of cyclopentenolone compound |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5788142A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0080671A1 (en) * | 1981-11-19 | 1983-06-08 | Sumitomo Chemical Company, Limited | 4-Cyclopentenones and their production |
JPS59144729A (en) * | 1983-02-03 | 1984-08-18 | Sumitomo Chem Co Ltd | Preparation of optically active 4-hydroxy-2- cyclopentenones |
JPH05246931A (en) * | 1992-11-30 | 1993-09-24 | Sumitomo Chem Co Ltd | Production of optically active 4-hydroxy-2-cyclopentenones |
-
1980
- 1980-11-20 JP JP16437280A patent/JPS5788142A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0080671A1 (en) * | 1981-11-19 | 1983-06-08 | Sumitomo Chemical Company, Limited | 4-Cyclopentenones and their production |
JPS59144729A (en) * | 1983-02-03 | 1984-08-18 | Sumitomo Chem Co Ltd | Preparation of optically active 4-hydroxy-2- cyclopentenones |
JPH05246931A (en) * | 1992-11-30 | 1993-09-24 | Sumitomo Chem Co Ltd | Production of optically active 4-hydroxy-2-cyclopentenones |
Also Published As
Publication number | Publication date |
---|---|
JPS6254416B2 (en) | 1987-11-14 |
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