Disulfur Monoxide S2O

Within the sulfur sub-group, there are two main types of oxides, the dioxides X 02 (X = S, Se, Te, Po) and the trioxides X Os (X = S, Se, Te). In addition, sulfur also forms disulfur monoxide, S2O. Transient XO species are known in the gaseous phase for S, Se, and Te. Polonium forms a black monoxide PoO. 

The coordination chemistry of NS (thionitrosyl), thiazate (NSO ), disulfidothionitrate (SsN"), sulfur monoxide (SO), disulfur monoxide (S2O), SO2, DMSO, thiosulfate, sulfite, and thiourea ligands is extensive. " Scheme 23 illustrates their coordination modes and some of the complexes that can be generated. 

Thiophene 1-oxides can also react with sulfur compounds through Diels-Alder reactions to afford the corresponding sulfur-containing cycloaddition products. For example, disulfur monoxide (S2O) can undergo a yn-Jt-face-selective Diels-Alder reaction with 3,4-di-tert-butylthiophene 1-oxide, leading to the sulfur-containing product 47 (Scheme 43) [47, 48]. 

---