The Catalytic Isomerization of Terminal Carbon–Carbon Double Bonds in Liquid Crystalline Polyesters at Hydrosilation with 1-(1′-Arylethoxy)-1,1,3,3-Tetramethyl Disiloxanes

Abstract

In the present article, we report on the synthesis and investigation of the hydrosilylation of liquid crystalline compounds with terminal carbon–carbon double bonds in aliphatic tails mediated by complexes of rhodium (I) and platinum (II). New liquid crystalline compounds based on terephthaloyl-bis-4-oxybenzoate with terminal carbon-carbon double bonds in aliphatic tails were synthesized. The introduction in aliphatic tails of polar and light polarizible fragments lead to a decrease of mesomorphogenic ability-resulting compounds. The hydrosilylation of liquid crystalline compounds with terminal carbon-carbon double bonds in aliphatic tails with 1-(1′-arylethoxy)-1,1,3,3-tetramethyl disiloxanes mediated by complexes of rhodium (I) and platinum (II) was investigated. The main process in these conditions was the isomerization of olefin fragments.

Keywords:

• Dialkenyl terephthaloyl-bis-4-oxybenzoates
• hydrosilylation
• isomerization of olefins

Acknowledgments

This work was made with the support of RFBR (grant 06-08-00195-a).