PREPARATION OF NEW CARBOSILANE DENDRIMERS CARRYING MESOGENIC GROUPS

A series of new carbosilane dendrimers was prepared by repeating a com bination of hydrosilation and allylation on a core molecule, triallylp henylsilane. Subsequent hydroboration and oxidation of the dendrimers gave the polyol derivatives, which were treated with a mesogenic molec ule, 6-(4-cyanobiphenyl-4-oxy)hexanoyl chloride, to give new carbosila ne dendrimers carrying mesogenic groups. It was found that the all car bosilane dendrimers exhibited liquid crystal phases. The effects of th e dendrimer generations on the ranges of liquid crystal temperatures w ere investigated.