The Synthesis and Properties ofP-, P′- Disubstituted Phenyl Thiolbenzoates:

A class of nematic liquid crystals, the p-, p′- Disubstituted phenyl thiolbenzoates, I, are reportyed. The phenyl thiolbenzoates have higher melting points and higher clearing points than the oxygen analog phenylbenzoates. This increased nematic stability affords the formulation of liquid crystalline systems with high clearing points. The phenyl thiolbenzoates were synthesized by condensation of a benzoyl chloride and thiophenol. The thiophenols were prepared by the alkaline hydrolysis of the corresponding xanthate esters. The results indicate that the phenyl thiolbenzates show good potential for use in field effect display devices.