A study of the thermal racemisation of (-)-3,3-diphenyl-2-(t-butyl) oxaziridine and (-)-1-chloro-2,2-diphenylaziridine in several nematic solvents using a microscopic technique

Gian Piero Spada, Anna Tampieri, Giovanni Gottarelli, Irene Moretti, Giovanni Torre

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

The thermal racemisation of (-)-3,3-diphenyl-2-(t-butyl)oxaziridine [(-)-(1)] and (-)-1-chloro-2,2diphenylaziridine [(-)-(R)-(2)] in nematic liquid-crystal (LC) solvents has been followed directly on a thermostatic microscopic stage by measuring the variations in time of the diameters of the Grandjean-Cano disclination circles, which are associated with the induced cholesteric structure. With respect to isotropic solvents, the nematic phases exert relevant influences on the process, affecting both the activation enthalpy and entropy. Although the two variations partially compensate, the first-order rate constants are smaller in the nematic solvents.

Original languageEnglish (US)
Pages (from-to)513-516
Number of pages4
JournalJournal of the Chemical Society, Perkin Transactions 2
Issue number5
DOIs
StatePublished - 1989

ASJC Scopus subject areas

  • Chemistry(all)

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