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The Structures of 4- and 5-Substituted Δ4-Thiazolin-2-ones
Cornwell, Stephen P.,Kaye, Perry T.,Kent, Alexander G.,Meakins, G. Denis
, p. 2340 - 2343 (2007/10/02)
In order to establish the structures of compounds described as Δ4-thiazolin-2-ones ten sets of heterocycles (each comprising a 4- or 5-substituted Δ4-thiazolin-2-one, the N-methyl derivative, and the corresponding 2-methoxythiazole) have been examined by i.r., u.v., and 1H and 13C n.m.r. spectrometry.The i.r. results established that in solution the parent compounds exist entirely or predominantly as the 2-oxo-forms.This conclusion is supported by the 1H n.m.r. evidence, but the u.v. and 13C n.m.r. data do not give a clear distinction between the possible 2-oxo- and 2-hydroxy-structures.
