Acetic Acid → 1-(2,5-Dimethoxyphenyl)-2-methyl-4-phenyl-1-butene

Participants

Reaction Steps

A solution of n-butyl lithium (29 ml. of 2.2 M) is added dropwise to 2,5-dimethoxybenzyl triphenylphosphonium bromide (31.5 g.) in tetrahydrofuran (200 ml.) with stirring and the resulting deep red solution is stirred for one-half hour. Benzyl acetone (9.4 g.) is added dropwise and the reaction mixture stirred for 12 hours. It is then adjusted to pH 7 by addition of acetic acid and concentrated under reduced pressure. The residue is extracted with methylene chloride and the extract evaporated to give crude 1-(2,5-dimethoxyphenyl)-2-methyl-4-phenyl-1-butene as an oil. It is purified by chromatography on silica gel and elution with benzene.

Provenance & Evidence