E-isomer Z-isomer a Reagents: method A ArCHO, ZnClz in AczO; method B,(a) n-BuLi, MesSiC1,(b) n-BuLi, ArCHO, H+. as it allows the preparation of both the (E)-(8 and 11) and (2)-benzylidene (9, 10, and 13) derivatives. This method entailed the preparation of the organosilane, by forming an anion of the tetrahydr~ quinolinel~ with n-butyllithium followed by reaction with trimethylsilyl chloride. l8 The silane was then reacted with another ...
