Reductive rearrangements of the retrobenzilic acid type induced by Lewis acids—IX

Add time:08/01/2019    Source:sciencedirect.com

5,5-Diphenyl-2,4-thiazolidinedithione (3a), when refluxed with anhydrous AlCl3 in toluene, is desulfurated and rearranged to 4,5-diphenyl-4-thiazoline-2-thione (4). Neither 2,2-diphenyl-1,4,2H- benzothiazine-3(4H)-thione (5b) nor its S-Me derivative (6 are changed on similar treatment.

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