Ring Compounds with P and

Compounds with rings built from P and S atoms are found amongst the phosphorus sulphides (Chapter 4.3), cyclometaphosphorothioates (9.492), thiono-phosphine sulphides (Table 9.6), and the P2S6 and P2Si anions (Table 9.5). Some other compounds having P-S rings are the reaction products from trifluoromethylphosphine and sulphur (9.613), and the products from reactions (9.614) [24]. 

A six-membered ring of P and S atoms is obtained in reaction (9.615), while four- and six-mem-bered rings are obtainable from P4S3 (9.616), and a three-membered ring is produced in Equation 9.617. 

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