Herbert DE, Miller AD, Ozerov OV. Phosphorus(III) cations supported by a PNP pincer ligand and sub-stoichiometric generation of P4 from thermolysis of a nickel insertion product.
Chemistry 2012;
18:7696-704. [PMID:
22628166 DOI:
10.1002/chem.201103981]
[Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Indexed: 11/05/2022]
Abstract
Neutral, mono-, and dicationic phosphorus(III) compounds are accessible with a supporting PNP pincer ligand (PNP = [4-Me-2-iPr(2)P-C(6)H(3))(2)N]). Reaction of (PNP)H with PCl(3) and nBu(3)N furnished (PNP)PCl(2) (1), which displays a highly temperature-dependent structure in solution. Synthesis and characterization by NMR spectroscopy and X-ray crystallography of Cl/Br-scrambled derivatives, a monocationic derivative [(PNP)PCl][HCB(11)H(11)] (4), and the dicationic derivatives [(PNP)P][OTf](2) (5), [(PNP)P][B(C(6)F(5))(4)](2) (6), [(PNP)P][B(12)Cl(12)] (7) established that 1 not only undergoes several fluxional processes in solution but also possesses a temperature-dependent ground state structure. Reaction of 1 with a Ni(0) source initially leads to a phosphine-phosphinidene complex, followed by thermal generation of P(4).
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