General Preparatory Strategies For cyclo-sulfur Allotropes
Two methods exist for the preparation of the cyclo-sulfur allotropes. One of the methods, which is most famous for preparing hexasulfur, is to react hydrogen polysulfides with polysulfur dichloride:
- H2Sx + SyCl2 → cyclo-Sx+y + 2 HCl
Another strategy uses titanocene pentasulfide as a source of the S52- unit. This complex is easily made from polysulfide solutions:
- 2 + (C5H5)2TiCl2 → (C5H5)2TiS5 + 2 NH4Cl
Then the resulting pentasulfur-titanocene complex is allowed to react with polysulfur dichloride to give the desired cyclo-sulfur in the series:
- (C5H5)2TiS5 + SyCl2 → cyclo-Sy+5 + (C5H5)2TiCl2
Read more about this topic: Allotropes Of Sulfur
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