Unilever Patent Holdings B.v.

Quest International B.v.

Keith Robert Motion

Christopher P Newman

Stephen D Watkins

Angela Janousek

Stephen E Meakins

Hydroxy alkyl amides of dicarboxylic acids and their use in cosmetic

Process for preparing an alkyl substituted tetralin or indane by reacting a benzyl alcohol with an alkene having 4-7 carbon atoms under the influence of a Lewis acid catalyst. The product can be further reacted with an acyl halide or alkylene epoxide without prior isolated from the initial reaction mixture.

Process for the preparation of alkyl substituted tetralins and indanes

The invention relates to a process for the conversion of 8-hydroxymenthenes into 8-hydroxycymenes by reacting the 8-hydroxymenthenes in the liquid phase in the presence of a dehydrogenation catalyst, e.g. palladium and a hydrogen acceptor e.g. mesityl oxide. The process is preferably carried out at 80.degree.-150.degree. C. and in the presence of base. The process is particularly suitable for converting 8-hydroxy-p-menth-1-ene into 8-hydroxy-p-cymene. The reaction products are of value as intermediates in the preparation of fragrance chemicals.

Cymenol preparation by transfer dehydrogenation

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Hythe, United Kingdom

Keith Robert Motion