Dragoco Gerberding & Co. Gmbh

Ludwig Tumbrink

Ernst-Joachim Brunke

4,4,7-trimethyl-3,4,7,8-tetrahydro-2(6H)-naphthalen-one is obtained by an elimination reaction from 3-oxo-.alpha.-ionol by way of direct addition thereof to a solution of a protonic acid in an inert solvent at an elevated temperature, or following its conversion into a low-carbon alkyl ester, particularly acetate, by way of the treatment of the latter, preferably with sodium acetate, in a polar non-protonic solvent at 150.degree.14 300.degree. C., wherein the output can be increased by raising the temperature of reaction. The product of the process is suitable, in pure form or as mixed with simultaneously produced 3,5,5-trimethyl-4-butenylidene-cyclo-hex-2-en-1-one, as an odiferous substance or as a fragrant substance for foods and tobacco.

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Hoxter, Germany

Ludwig Tumbrink