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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 1 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.)