1H NMR spectral studies of some 2,6-diaryl-4-aminothianes

H-1 NMR spectra have been recorded for 4-amino-r(2), t(6)-diphenylthiane 5, three c(4)-amino-r(2), c(6)-diarylthianes 6a-8a and three t(4)-amino-r(2), c(6)-diarylthianes 6b-8b at 270 MHz. The various proton-proton coupling constants and chemical shifts have been determined. Analysis of the vicinal coupling constants suggests compounds 5, 6a-8a and 6b-8b largely exist in chair conformation. In 5 the amino group prefers to be equatorial.