1,8-Diazabicyclo(5.4.0)undec-7-ene → Benzyl 2-[4-(2-methoxyphenyl)-1-butenyl]phenyl ether

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Following a procedure similar to that described in the first part of Preparation 3, the whole of the 3-(2-methoxyphenyl)propanal prepared as described above, 1.65 g of 2-benzyloxybenzyltriphenylphosphonium chloride (prepared as described in Preparation 1) and 1.01 g of 1,8-diazabicyclo[5,4,0]undec-7-ene were reacted in 30 ml of acetonitrile. The crude product, extracted as described in Preparation 3, was purified by column chromatography through silica gel, using a 9:1 by volume mixture of hexane and ethyl acetate as the eluent, to give 0.98 g of benzyl 2-[4-(2-methoxyphenyl)-1-butenyl]phenyl ether as a colorless oil.

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