Heterocyclothiazenes containing phosphorus III or other p-block elements

2 Heterocyclothiazenes containing phosphorus(III) or other p-block elements 

The eight-membered rings 13.14 normally adopt boat conformations in the solid state with short S=N bond distances (1.51-1.52 A) that are typical of sulfur diimides. There are no transannular S S contacts. The sole exception is the antimony derivative BuSb(NSN)2Sb Bu, which is a planar eight-membered ring. 

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