Process for the preparation of vitamin E
AssigneeAventis Animal Nutrition S.A.
InventorsJildaz Dhainaut, Thierry Durand
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Abstract
The invention concerns a novel method for preparing vitamin E. More particularly, it concerns a novel method for the condensation of Arimethylhydroquinone and isophytol.
Claims11
Process for the condensation of a phytol with trimethylhydroquinone in a polar solvent of the ester type and in the presence of a Bronsted acid and of a zinc halide, characterized in that the reaction is carried out in the presence of an amount of water of between 0.7 molar eq. and 2 molar eq. with respect to the number of moles of zinc halide used and in the presence of an amount of zinc halide of greater than 0.3 molar equivalent with respect to the phytol.
Process according to any one of the preceding claims, characterized in that an organic acid, and preferably acetic acid, is added to the reaction medium.
Process for the preparation of α-tocopherol acetate, characterized in that the α-tocopherol is brought into contact with acetic anhydride in the presence of an inorganic acid chosen from sulphuric acid or phosphoric acid or in the presence of an alkaline acetate and in the absence of any solvent.
Dependencies are inferred from the claim text.