1,4-Thiomorpholines: Part Ⅴ—2D NMR studies on alkyl 6-aroyl-3,5-diaryl-1,4-thiomorpholine-1,1-dioxide-2-carboxylates. Revised proton and carbon chemical shift assignments

摘要

A study of ~1H-~(13)C COSY spectral data of alkyl 6-aroyl-3, 5-diaryl-1, 4-thiomorpholine-1, 1 -dioxide-2-carboxy-lates (1) leads to the revision in the previously assigned proton resonances. Solvent induced conformational changes of methyl 6-aroyl-3,5-diphenyl-1,4-thiomor-pholine-1,1-dioxide-2-carboxylate (4) have been found to vary gradually with the variation in the ratio of solvents.