JPS5557535A - Preparation of delta-ketocarboxylic acid - Google Patents
Preparation of delta-ketocarboxylic acidInfo
- Publication number
- JPS5557535A JPS5557535A JP12953678A JP12953678A JPS5557535A JP S5557535 A JPS5557535 A JP S5557535A JP 12953678 A JP12953678 A JP 12953678A JP 12953678 A JP12953678 A JP 12953678A JP S5557535 A JPS5557535 A JP S5557535A
- Authority
- JP
- Japan
- Prior art keywords
- water
- calcium hydroxide
- cyclohexanedione
- geranyl
- formulas
- 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.)
- Pending
Links
Abstract
PURPOSE: To obtain the title substances at low cost and in high yield, by the ring- closure of 2-geranyl-1,3-cyclohexanedione in the presence of water and calcium hydroxide.
CONSTITUTION: By the ring-closure of 2-geranyl-1,3-cyclohexanedione having three kinds of isomers of formulas I, II and III, in the presence of water and calcium hydroxide, δ-ketocarboxylic acids of formulas IV, V and VI corresponding to the raw materials are obtained. Less than 500mol of water (preferably 25W200mol) and 0.5W5mol of calcium hydroxide (preferably 0.5W1mol) are used to 1mol of the raw materials. The reaction temperature is 80W150°C (preferably 90W110°C) and the reaction time is 9W12hr. Since δ-ketocarboxylic acids are obtained in the form of calcium salts, they are made free by the addition of a strong acid such as hydrochloric acid or sulfuric acid, and then separated from water layer with ether, etc.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12953678A JPS5557535A (en) | 1978-10-23 | 1978-10-23 | Preparation of delta-ketocarboxylic acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12953678A JPS5557535A (en) | 1978-10-23 | 1978-10-23 | Preparation of delta-ketocarboxylic acid |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5557535A true JPS5557535A (en) | 1980-04-28 |
Family
ID=15011939
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12953678A Pending JPS5557535A (en) | 1978-10-23 | 1978-10-23 | Preparation of delta-ketocarboxylic acid |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5557535A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8960377B2 (en) | 2007-03-29 | 2015-02-24 | Otis Elevator Company | Non-linear spring isolation device |
-
1978
- 1978-10-23 JP JP12953678A patent/JPS5557535A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8960377B2 (en) | 2007-03-29 | 2015-02-24 | Otis Elevator Company | Non-linear spring isolation device |
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