Preparation of polyene-aldehydes

Details Preparation of polyene-aldehydes Preparation of polyene-aldehydes

C - Chemistry, Metallurgy

07

D

260/565, 260/395

C07D 319/06 (2006.01) C07C 175/00 (1980.01)

Patent

CA 1120937

O.Z. 0050/033537 PREPARATION OF POLYENE-ALDEHYDES Abstract of the Disclosure: A process for the prepara- tion of polyene-aldehydes, derived from 2,6-dimethyl- 2,4,6,8-nonatetraen-1-al by substitution in the 9-posi- tion, by means of the Wittig ylide synthesis. The process is based on the observation, contrary to all expectation, that on reacting 2,6-dimethyl-octa-2,4,6- triene-l,8-dial with an equimolar amount of an ylide, it is exclusively the 8-al group of the dialdehyde which reacts. This specificity of the reaction is of par- ticular importance for the preparation of the food dye .beta.-apo-8'-carotinal.

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