2-and 3-Phenylthionaphthens

Abstract

The product obtained from 3-(1'-cyclohexenyl)thionaphthen (I) by dehydrogenation with sulphur at 240-250 °C is shown to be 2-phenylthionaphthen rather than 3-phenyl-thionaphthen (II) as assumed by Schuetz and Ciporin (1958a, 1958b). The dissimilarity of the ultraviolet absorption spectra of 2- and 3-phenylthionaphthens is discussed.