✦ LIBER ✦

A method for reproducible preparation of chiral polysiloxanes with regular repeat units as stationary phases for capillary gas chromatography

✍ Scribed by Abe, Iwao ;Nishiyama, Takako ;Frank, Hartmut

Publisher: John Wiley and Sons
Year: 1994
Tongue: English
Weight: 540 KB
Volume: 17
Category: Article
ISSN: 0935-6304
DOI: 10.1002/jhrc.1240170103

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✦ Synopsis

Abstract

Trifluoroethyl ester‐functionalized polysiloxanes can be prepared by block condensation of 3‐dichloromethylsilyl‐2‐methylpropionic acid 2′,2′,2′‐trifluoroethyl ester with 1,5‐bis(diethylamino)hexamethyltrisiloxane or with disodium tetramethyldisiloxane‐1,3‐diolate. The functionalized polysiloxanes may serve as supports for a variety of selector groups; for instance, nucleophilic displacements with L‐valine‐t‐butylamide or L‐α‐naphthylethylamine lead to chiral polysiloxanes in high yields and with high reproducibility. Imidazole accelerates the rate of nucleophilic displacement. Capillary columns coated with such chiral polysiloxanes exhibit high enantioselectivity and thermostability.

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