DE2439860

1452012 Isomerizing vitamin A compounds F HOFFMANN-LA ROCHE & CO AG 20 Aug 1974 [21 Aug 1973] 36568/74 Heading C2V Vitamin A compounds and derivatives are isomerized by contact with palladium compounds other than palladium phthalocyanin and palladium compounds containing cyanide groups. The vita...

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Hauptverfasser:	WAGNER, HANS PETER., ITINGEN, STOLLER, HANSJOERG., REINACH
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY HUMAN NECESSITIES HYGIENE MEDICAL OR VETERINARY SCIENCE METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES THEIR RELEVANT APPARATUS TRANSPORTING
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Zusammenfassung:	1452012 Isomerizing vitamin A compounds F HOFFMANN-LA ROCHE & CO AG 20 Aug 1974 [21 Aug 1973] 36568/74 Heading C2V Vitamin A compounds and derivatives are isomerized by contact with palladium compounds other than palladium phthalocyanin and palladium compounds containing cyanide groups. The vitamin A compounds are those of formula where X is -CHO, -CH 2 OH, -COOH, -CH(R) 2 , -CH 2 OR1, -COOR2, -CONHR3 or -CON(R3) 2 , R being an alkoxy group or two R's together are an alkylenedioxy group, R1 being an alkanoyl or aroyl group, R2 being an alkyl, aryl or aralkyl group and R3 a hydrogen atom or an alkyl, aryl or aralkyl group. The isomerization may be carried out by heating in a solvent a mixture of the vitamin A compound and the palladium compound. In examples 9- cis, 11-cis and all-trans isomers of vitamin A acetate and aldehyde are isomerized with various palladium compounds.