Abstract
A select number of 4-alkyl and alkoxyphenyl-4′-acyloxybenzoates and phenylthio-benzoates of the type
A comparison of the mesomorphic properties of the esters with X = RCO2 with those when Y = OCOR’ showed only small differences in these two isomeric series. The types of mesophases which were enhanced were the same in both series. Monotropic smectic B phases seemed more prevalent when Y = OCOR’ than when X = RCO2, possibly due to lower crystallization temperatures. Melting and clearing temperatures did not vary appreciably in these two series nor from those observed when X and Y are alkyl or alkoxy groups.