Transition-metal-substituted diphposphenes. 10. Reaction of the diphosphenyl complex (h5-C5Me5)(CO)2FeP:PAr (Ar = 2,4,6-tert-Bu3C6H2) with sulfur and selenium. Preparation and x-ray structure analysis of the first phosphinidene(thioxo)phosphoranyl complex (h5-C5Me5)(CO)2FeP(S):PAr.
The reaction of (h5-C5Me5)(CO)2FeP:PR [R = 2,4,6-(Me3C)3C6H2] with S and Se in THF at 20 Deg afforded the novel complexes (h5-C5Me5)(CO)2FeP(:E):PR with a ligand formally derived from the metaphosphite ion PO2-. Only the S deriv. appeared to be stable at ambient temp., whereas the Se compd. in soln. slowly rearranged to the selenadiphosphiranyl complex I. The structure of the S deriv. was established by a single-crystal x-ray diffraction study.
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