Process for obtaining cholesteric liquid crystals by...

C - Chemistry – Metallurgy – 09 – K

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C09K 19/38 (2006.01) C07B 57/00 (2006.01) C08G 63/60 (2006.01)

Patent

CA 2278568

Process for synthesizing polymers +, PTOBEE (C26H20O8)n and PTOBDME (C34H36O8)n, with the addition of acid dichloride and DL-treo-1,2-butanediol in Cl-naphtalene and DL-1,2-dodecanediol with diphenyl oxide, respectively, by passing them through a nitrogen stream at room temperature, heating the mixture, settling in toluene the mixture and filtering. In the resulting settling toluene, the polymer precipitates the enantiomer (-) PTOBEE. The compounds obtained are of the cholesteric liquid crystal type, obtained by stereoselective recrystallization in toluene.

L'invention concerne un procédé par lequel les polymères +, le PTOBEE (C¿26?H¿20?O¿8?)¿n? et le PTOBDME (C¿34?H¿36?0¿8?)¿n?, sont synthétisés avec l'ajout respectif de dichlorure d'acide et DL-treo-1,2-butanediol en Cl-naphtalène et DL-1,2-dodécanediol avec l'oxyde de diphényle respectivement. Le procédé consiste à les passer par un courant d'azote à température ambiante, à chauffer le mélange, à élutrier en toluène le mélange filtré et à le filtrer. Le toluène résultant de l'élutriation du polymère permet de confirmer la structure de l'énantiomère (-) PTOBEE. Les composés ainsi obtenus sont du type cristal liquide cholestérique, obtenus par recristallisation stéréosélective en toluène.

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