Poly-sulfur-nitrogen heterocycles via sulfur chlorides and nitrogen reagents

The family of poly-sulfur-nitrogen heterocycles includes highly stable arom atic compounds that display physicochemical properties with relevance in th e design of new materials, especially those relating to molecular conductor s and magnets. The interesting characteristics found in many of these heter ocycles have led to the development of modern synthetic methods that are th e subject of this review. Heterocycles such as 1,2,3- and 1,2,5-thiadiazole s, 1,2,3- and 1,3,2-dithiazoles, 1,2,3,5-dithiadiazoles, thiatriazines, tri thiadiazines, dithia(and trithia)diazepines, trithiatriazepines, dithia(and trithia)tetrazozines, and fused systems are most commonly synthesized from tetrasulfur tetranitride and organic substrates (alkynes, diazomethanes), and from sulfenyl chlorides, sulfur or disulfur dichlorides and nitrogen co ntaining reagents such as bis(trimethylsilyl)surfurdiimide, trimethylsilyl azide, trisilylated amidines, N-imidoylamidines, hydrazones, oximes, and am ines.