Four-membered Rings containing Sulphur and Silicon or Germanium

12 Four-membered Rings containing Sulphur and Silicon or Germanium 

3 DiethyI-2,4-dimethyl-3-siIathietan is prepared from divinyl sulphide by its reaction with diethylsilane. Tetramethyl-2,4-disila-l,3-dithietan disproportionates with octamethyl-l,4-dithia-2,3,5,6-tetrasilacyclohexane to give hexamethyl-1,3-dithia-2,4,5-trisilacyclopentane.  

2-Diethyl-2-germathietan has been proposed as an intermediate in the reaction of thiiran with diethylgermylene.  

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