Cyclohexene derivatives and their preparation

Details Cyclohexene derivatives and their preparation Cyclohexene derivatives and their preparation

C - Chemistry, Metallurgy

07

C

260/395, 260/567

C07C 43/303 (2006.01) C07C 43/30 (2006.01)

Patent

CA 1111055

ABSTRACT OF THE DISCLOSURE: 1-[3-Methyl-3,5,5-trialkoxy-pent- -1-yn-1-yl]-2,6-dimethyl-cyclohex-1-enes, which may or may not be methyl-substituted in the 2- and/or 6-position, are obtained by reacting the corresponding 1-[3-methyl-but-1-yn-3-en-1-vl]- -2,6-dimethyl-cyclohex-1-enes with orthoformic acid esters in the presence of acid condensing agents. The new comoounds provide a new method of access to the compounds of carotinoid chemistry, especially to vitamin A, which avoids the conventional expensive synthesis via phosphorus ylide compounds.

301179

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