Rhone-Poulenc Nutrition Animale

Adisseo France Sas

Aventis Animal Nutrition S.a.

Pierre Meilland

Jean-Erick Ancel

Hugues Bienayme

Intermediate compounds which can be used in the preparation of phytone and Vitamin E, a process for the preparation thereof, and a process for the preparation of phytone and Vitamin E from these intermediate compounds.

Intermediates for use in the preparation of vitamin E

The invention relates to a process for making vitamin A from ethynyl-retro-&agr;-ionol using an allene acetate as intermediate.

Method for preparing vitamin A

A process for the preparation of substituted phenols, in particular, the condensation of phenols having one or more alkyl substituents with a butadiene derivative comprising at least six carbon atoms, in particular myrcene and/or .beta.-springene is disclosed. The cyclization, in the form of chromans, of the products obtained during this condensation and their hydrogenation in order to prepare vitamin E is also disclosed.

Process for the preparation of substituted phenols

The present invention relates to novel intermediates for the preparation of vitamin A and carotenoids corresponding to the formula (II): ##STR1## in which A represents a hydrogen or an alkyl, alkenyl or alkoxy group containing 1 to 4 carbon atoms, and X represents a carbon atom, and to a process for their preparation and their use, and further relates to compounds for preparing intermediates of formula (II) corresponding to the formula (III): ##STR2## in which R represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkylcarbonyl, alkenylcarbonyl, alkoxyalkyl or alkoxyalkenyl group in which the alkyl groups have 1 to 10 carbon atoms and the alkenyl groups have 2 to 10 carbon atoms, each of said groups being linear or branched and each being substituted or unsubstituted.

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Chaponost, France

Pierre Meilland