Abstract
Reaction of some selected benzoic acid hydrazides 1a–c with phosphorus decasulfide P4S10 in dry pyridine afforded some novel pyridine solvate of 1,3,4,2‐thiadiazaphospholes 2a–c. Similarly, treatment of their corresponding hydrazones 3a–c toward phosphorus decasulfide under the same reaction conditions gave the corresponding thio‐analog 4 and 1,3,2‐benzoxazaphosphinine and benzodiazaphosphinine pyridine solvates 5a,b, respectively. Treatment of (thio)semicarbazides and their corresponding (thio)semicarbazones with phosphorus decasulfide in dry pyridine yielded the novel 1,2,4,3‐triazaphospholidines 6a,b, and 1,3,2‐diazaphosphetidines 8a,b, respectively. Moreover, cyclization of (thio)carbohydrazides and their mono‐(thio)carbohydrazones with phosphorus decasulfide produced 1,2,4,3‐triazaphospholidines 9a,b and 11a,b, respectively. The structures of these products were confirmed from analytical and spectral data.
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