关键词: 苯甲醛 P, 维蒂希反应, 苄基, 立体化学, 二苯基膦, 二苯代乙烯 P

The stereochem. of the Wittig reaction of benzylidenealkyldiphenylphosphoranes with substituted benzaldehydes was studied. Experimental results showed that the products alkenes were mainly of the E-type, and the E-selectivity was dependent upon the ylide structures, reaction conditions and the polarity of the substituents of the aromatic aldehydes. The logarithms of the E/Z ratio were found to have a linear relationship with the const of the substituents (s).

Key words: BENZALDEHYDE P, WITTIG REACTION, BENZYL GROUP, STEREOCHEMISTRY, DIPHENYLPHOSPHINE, DIPHENYLETHYLENE P