92974-23-7Relevant 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 (2007/10/02)
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.
LIQUID CRYSTAL MATERIALS WITH SULFUR ATOMS INCORPORATED IN THE PRINCIPAL STRUCTURE: 1. NEW LIQUID CRYSTAL COMPOUNDS WITH 1,3-DITHIANE RING.
Haramoto,Nobe,Kamogawa
, p. 1966 - 1969 (2007/10/02)
2-(p-Substituted phenyl)-5-alkyl-1,3-dithianes, new liquid crystals, were synthesized by the thioacetalization of the corresponding aldehydes and dithiols. These compounds have characteristic supercooling states, exhibit monotropic liquid crystal phases even in the case of long terminal alkyl substituents. The mesomorphic characteristics of these compounds were different from those of the corresponding 1,3-dioxanes, this must originate in the difference in the molecular width caused by the difference in the atomic volume between sulfur and oxygen.
