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The 3,5-dimethoxybenzyl triphenylphosphonium bromide is prepared by refluxing a mixture of 3,5-dimethoxybenzyl bromide (12 g.) and triphenylphosphine (14.2 g.) in acetonitrile (200 ml.) for one hour. The reaction mixture is then cooled and the crystalline product recovered by filtration, washed with ether and dried (20 g.); m.p. 269°-270° C.

1. temperatureby refluxing
2. temperatureThe reaction mixture is then cooled
3. filtrationthe crystalline product recovered by filtration
4. washwashed with ether
5. customdried (20 g.)