PHOSPHORUS-RICH PHOSPHORUS SULFIDE CAGE COMPOUNDS - NUCLEAR-MAGNETIC-RESONANCE EVIDENCE FOR COMPOUNDS WITH P5S2 OR P6S SKELETONS

Cage compounds P5S2R (R = H, NMePh, PPh2, SPh, Cl, Br or I) and two in vertomers Of P6SI2 have been identified as phosphorus-rich analogues O f P4S3, in which a mu-PR or two mu-PI groups replace bridging sulfur. P5S2I may be made as a mixture with P4S3 and alpha-P4S3I2 by heating r ed phosphorus with sulfur and iodine to 260-degrees-C, or by reaction of P4, S8 and I2 in CS2, when the isomers Of P6SI2 are also present. P 5S2(PPh2) is formed as a byproduct in the preparation of alpha-P4S3(PP h2)I from alpha-P4S3I2 and Ph2PH. The new compounds were characterised in solution by full analysis of their P-31 NMR spectra.