“…These authors found that when compound XXVII was subjected to heat, it decomposed to give the thione and ethylene sulfide, and also noted that when R was CH3 or COOCüHs, decomposition occurred more readily. It was therefore assumed that the reaction with O. PHENYL AZIDE Schónberg and Urban (193) found that although azides do not react with ketones, they react quite readily with thiones to form Schiff's bases. The following Schiff's bases were obtained by reacting the azide with the thione: Schónberg (172) reported that when fluorene was fused with diaryl thiones, hydrogen sulfide was evolved, and the biphenylenediarylethylenes were formed.…”