Conformational analysis of 2,3-disubstituted 1,4-dithianes by NMR spectroscopy and MMX calculationsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The conformer populations for trans- and cis-2,3-disubstituted 1,4-dithianes have been determined by 1H and 13C NMR spectroscopy and calculated by molecular mechanics (MMX). The CH2X-substituents demonstrate the strong preference for axial position. The remarkable difference originating from intramolecular steric interactions has been observed between two trans-dialkyl derivatives: the trans-2,3-dimethyl-1,4-dithiane is predominantly equatorial whereas trans-2,3-dipropyl-1,4-dithiane prefers diaxial conformation. The properties of cis-2,3-dipropyl-1,4-dithiane are also unusual: its ring interconversion is unexpectedly slow.