Pyridine → 4'-Cyano-4-biphenylyl n-heptyl carbonate

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Reaction Steps

0.976 G. of 4'-cyano-4-hydroxy-biphenyl are dissolved in 10 ml. of absolute pyridine and reacted with 1.07 g. of chloroformic acid n-heptyl ester as in Example 1. The 1.8 g. of yellow oil obtained according to the procedure described in Example 1 is dissolved in benzene and chromatographed on 90 g. of silica gel. Benzene elutes 1.782 g. of colorless crystals which are recrystallized from ether-hexane up to constant melting point and clearing point. The pure 4'-cyano-4-biphenylyl n-heptyl carbonate obtained melts at 50.2°-50.5° and has a clearing point of 65.2°. UV (EtOH): ε 270 = 25900.

Provenance & Evidence