96157-22-1Relevant academic research and scientific papers
Liqiud Crystal Materials with Sulfur Atoms Incorporated in the Principal Structure III. Trans and Cis Isomers of New Liquid Crystal Material: 2-(p-Substituted phenyl)-5-alkyl-1,3-dithianes
Haramoto, Yuichiro,Kamogawa, Hiroyoshi
, p. 477 - 480 (1985)
Trans and cis isomers of 2,5-disubstituted 1,3-dithianes were synthesized by the acid-catalyzed thioacetalization of p-substituted benzaldehydes and dithiols.The results of identifications of trans and cis isomers made by means of 13C NMR chemical shifts indicate that the isomerism occurred at the 5 position in the 1,3-dithiane ring.Benzaldehydes with electrondonating p-substituents produced less cis isomers than that with the cyano group, which seems to indicate the establishment of an equilibrium in the formation reaction between trans and cis isomers.Several electro-optic properties of trans- and cis-2-(p-cyanophenyl)5-alkyl-1,3-dithianes were determined by using them as a dopant of mixture of liquid crystals.Mixture added with trans isomers was superior to that added with cis isomers in several points.
