CONTRIBUTIONS TO THE CHEMISTRY OF PHOSPHO RUS .231. LI3P7S3 AND LI2HP7S2 - THE FIRST SULFIDO HEPTAPHOSPHANES(3)

The novel sulfide heptaphosphanes(3) Li3P7S3 (1) and Li2HP7S2 (2) have been obtained by the reaction of Li3P7 with sulfur in tetrahydrofuran under suitable conditions. The compounds 1 and 2 are also formed from LiP5 and sulfur and are only stable in solution below room temperatur e. According to a complete analysis of the P-31[H-1]-NMR spectra, in e ach case, the sulfur atoms are bonded as sulfide groups exocyclically to the heptaphosphanortricyclene skeleton. Compound 2 reacts with chlo ro(trimethyl)silane or acetylacetone at one of the two sulfide groups while compound 1 does not form any product with retention of the P-7(3 ) framework.