Abstract
The reaction of 4,5-dimethyl-2-phenylphosphinine with sulfur in boiling benzene in the presence of N-methylimidazole as a catalyst first yields a P-sulfide. This monosulfide further reacts with sulfur to give a diphosphinine trisulfide and a diphosphinine tetrasulfide. The X-ray crystal structure analysis of the trisulfide has been carried out. The two head-to-tail 1,6-dihydrophosphinine rings are connected by PSC and PC links, thus forming a central 1,2,4-thiadiphospholane heterocycle. The PC bridge is weak [1.881(3) A] and sulfur can insert into it to give the symmetrical tetrasulfide with two PSC bridges.
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