GB653679A - Improvements in or relating to the production of compounds having vitamin a activity - Google Patents
Improvements in or relating to the production of compounds having vitamin a activityInfo
- Publication number
- GB653679A GB653679A GB1706/48A GB170648A GB653679A GB 653679 A GB653679 A GB 653679A GB 1706/48 A GB1706/48 A GB 1706/48A GB 170648 A GB170648 A GB 170648A GB 653679 A GB653679 A GB 653679A
- Authority
- GB
- United Kingdom
- Prior art keywords
- benzene
- acid
- hydrogenation
- dehydration
- effected
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C403/00—Derivatives of cyclohexane or of a cyclohexene or of cyclohexadiene, having a side-chain containing an acyclic unsaturated part of at least four carbon atoms, this part being directly attached to the cyclohexane or cyclohexene or cyclohexadiene rings, e.g. vitamin A, beta-carotene, beta-ionone
- C07C403/06—Derivatives of cyclohexane or of a cyclohexene or of cyclohexadiene, having a side-chain containing an acyclic unsaturated part of at least four carbon atoms, this part being directly attached to the cyclohexane or cyclohexene or cyclohexadiene rings, e.g. vitamin A, beta-carotene, beta-ionone having side-chains substituted by singly-bound oxygen atoms
- C07C403/10—Derivatives of cyclohexane or of a cyclohexene or of cyclohexadiene, having a side-chain containing an acyclic unsaturated part of at least four carbon atoms, this part being directly attached to the cyclohexane or cyclohexene or cyclohexadiene rings, e.g. vitamin A, beta-carotene, beta-ionone having side-chains substituted by singly-bound oxygen atoms by etherified hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2601/00—Systems containing only non-condensed rings
- C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
- C07C2601/16—Systems containing only non-condensed rings with a six-membered ring the ring being unsaturated
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Compounds having vitamin A activity are obtained by subjecting a compound of the formula <FORM:0653679/IV (b)/1> to hydrogenation to produce a compound of the formula <FORM:0653679/IV (b)/2> which is subjected to alkali isomerization and if desired dehydrated. Preferably the hydrogenation is effected catalytically using a poisoned Raney nickel catalyst and the alkali isomerization is effected by treating the hydrogenated compound with a strongly alkaline substance such as sodium hydroxide, a sodium alkoxide in alcohol, or a quaternary ammonium hydroxide. Dehydration may be effected using benzoyl chloride in pyridine, acetyl chloride in dimethyl aniline, glacial acetic acid, glacial acetic acid and potassium acetate, toluenesulphonic acid in benzene, oxalic acid in benzene, glacial acetic acid in benzene, catalytic quantities of iodine in benzene and phenyl isocyanate in benzene. Detailed examples are given. The Specification as open to inspection under Sect. 91 comprises the steps of hydrogenation, dehydration, and acid or alkali isomerization in any desired order but excludes these steps in the order of hydrogenation, acid isomerization and dehydration. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US653679XA | 1947-10-03 | 1947-10-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB653679A true GB653679A (en) | 1951-05-23 |
Family
ID=22062222
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1706/48A Expired GB653679A (en) | 1947-10-03 | 1948-01-20 | Improvements in or relating to the production of compounds having vitamin a activity |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB653679A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1027661B (en) * | 1954-04-22 | 1958-04-10 | Eastman Kodak Co | Process for the production of vitamin A-aldehyde from 3, 7-dioxyvitamin A-aldehyde acetals |
-
1948
- 1948-01-20 GB GB1706/48A patent/GB653679A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1027661B (en) * | 1954-04-22 | 1958-04-10 | Eastman Kodak Co | Process for the production of vitamin A-aldehyde from 3, 7-dioxyvitamin A-aldehyde acetals |
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