Spectroscopic identification of 3-substituted 4-methoxycarbonyl-1,3-thiazolidine(or -oxazolidine)-2-thiones and 2-substituted thio-4-methoxycarbonyl-.DELTA.2-1,3-thiazolines(or -oxazolines).

Abstract

rac-4-Methoxycarbonyl-Δ2-1, 3-thiazolines 2a-z and rac-4-methoxycarbony1-1, 3-thiazoline-2-thiones 3a, d-t were examined by carbon-13 and proton nuclear magnetic resonance and ultraviolet spectroscopic methods to provide a basis for spectroscopic identification of Δ2-1, 3-oxazolines and 1, 3-oxazolidine-2-thiones. X-Ray structural analysis of 3-(4'-bromobenzy1)-2-thioxo-1, 3-thiazolidine-4-carboxylic acid 4n was also carried out.