NEW SYNTHESIS, THERMAL-PROPERTIES AND TEXTURES OF CHOLESTERIC L-1,4-PHENYLENECARBONYLOXY-1,4-PHENYLENECARBONYL], PTOBEE

Liquid crystal xy(1,2-butene)oxycarbonyl-1,4-phenyleneoxycarbonyl 1,3- phenylenecarbonyloxy-1,4-phenylenecarbonyl], PTOBEE, has been synthesi zed in a different way than the previously reported nematic and it has been obtained as cholesteric, although synthesized from a racemic mix ture of the 1,2-butanediol involved. Stereoselective solubilization of one enantiomer during its decantation in toluene, at the reaction tem perature, explains why this chiral polymer phase appears. Evidence of this could be precisely obtained when a white solid recrystallized wit hin the same toluene after the filtration of the polymer, being identi fied as (-) PTOBEE with a value of [alpha](589)(25) = -2.33 [0.0056 mo l/l, toluene].