Method for producing vitamin a acetate

Details Method for producing vitamin a acetate Method for producing vitamin a acetate

C - Chemistry, Metallurgy

07

C

C07C 403/20 (2006.01) C07C 67/293 (2006.01)

Patent

CA 2546307

The invention relates to a method for producing vitamin A acetate by reacting .beta.-vinyl ionol with triphenylphosphine in the presence of sulphuric acid in a solvent mixture consisting of between 60 and 80 % methanol, between 10 and 20 % water and between 10 and 20 wt. % aliphatic, cyclic or aromatic hydrocarbons with between 5 and 8 atoms, in order to obtain .beta.-ionylidene ethyltriphenyl phosphonium salts and then by a subsequent Wittig reaction using 4-acetoxy-2-methyl-but-2-enal.

L'invention concerne un procédé servant à produire de l'acétate de vitamine A par réaction de .szlig.-vinyl-ionol avec de la triphénylphosphine en présence d'acide sulfurique dans un mélange de solvants constitué de 60 à 80 % en poids de méthanol, de 10 à 20 % en poids d'eau et de 10 à 20 % en poids d'hydrocarbures aliphatiques, cycliques ou aromatiques ayant 5 à 8 atomes de carbone, pour obtenir des sels de .szlig.-ionylidène-éthyltriphénylphosphonium, puis par réaction de Wittig consécutive avec du 4-acétoxy-2-méthyl-but-2-énal.

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