Shuttling P3 from Niobium to Rhodium: The Synthesis and Use of Ph3SnP3(C6H8) as a P3 Synthon

摘要

Seeking new methods for phosphorus incorporation directly from its molecular elemental form, P4, we have begun to focus on cyclo-P3 complexes as a versatile class of intermediates. Although it is well-documented that a common result of P4 activation by transition metal complexes is replacement of a single vertex of the P4 tetrahedron by an ML_n fragment, such cyclo-P3 complexes were not recognized for their potential as phosphorus transfer agents until recently. Accordingly, anionic cyclo-P3 complexes of niobium have been shown to serve as sources of P3~(3-) upon stoichiometric treatment with suitable tripositive electrophiles, including acid chlorides, leading to triphosphabutadiene intermediates, or AsCl3, leading to AsP3.