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Helmut Nickels

Walter Rebafka

Alfred Hackenberger

Fatty acid esters of ascorbic acid are prepared by a process in which a homogeneous mixture of

Preparation of fatty acid esters of ascorbic acid

Process for the preparation of unsaturated alcohols and/or esters thereof by reacting conjugated dienes with water and/or aqueous carboxylic acid solutions in the presence of a macroporous acid ion exchanger and suitable solvents. The diene has the general formula I ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 are hydrogen or a methyl group and R.sup.2 also can represent an aliphatic hydrocarbon radical having 2 to 6 carbon atoms which may contain a double bond which is not in a conjugated position relative to the double bonds of the diene, and preferably R.sup.1 and R.sup.3 each represent groups CH.sub.3 or CH.sub.2 --CH.sub.3. Said diene is reacted in a homogeneous or quasi-homogeneous phase in the presence of said macroporous acid ion exchanger.

Process for the preparation of unsaturated alcohols and/or esters thereof

C.sub.1 -C.sub.20 -alkyl gallates are prepared by reacting tannin-containing material with the corresponding alcohol R--OH and a strong acid.

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Mutterstadt, Germany

Helmut Nickels