METHOD FOR PRODUCING VITAMIN A ACETATE

The present invention relates to a process for preparing vitamin A acetate by reacting beta-vinylionol with triphenylphosphine in the presence of sulfuric acid in a solvent mixture consisting of 60 to 80% by weight methanol, 10 to 20% by weight water and 10 to 20% by weight aliphatic, cyclic or arom...

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Bibliographic Details
Main Authors EXNER KAI MICHAEL, LAAS HARALD, MASSONNE KLEMENS, SZARVAS LASZLO, GLAS DETLEV
Format Patent
LanguageEnglish
Published 12.02.2009
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
APPARATUS THEREFOR
CHEMISTRY
GENERAL METHODS OF ORGANIC CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:The present invention relates to a process for preparing vitamin A acetate by reacting beta-vinylionol with triphenylphosphine in the presence of sulfuric acid in a solvent mixture consisting of 60 to 80% by weight methanol, 10 to 20% by weight water and 10 to 20% by weight aliphatic, cyclic or aromatic hydrocarbons having 5 to 8 carbon atoms to give beta-ionylideneethyltriphenylphosphonium salts and subsequent Wittig reaction with 4-acetoxy-2-methylbut-2-enal.
Bibliography:Application Number: US20080255460