ja802080m_si_004.cif (31.77 kB)

P2 Addition to Terminal Phosphide MP Triple Bonds: A Rational Synthesis of cyclo-P3 Complexes

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posted on 23.07.2008, 00:00 by Nicholas A. Piro, Christopher C. Cummins
The diphosphaazide complex (Mes*NPP)Nb(N[Np]Ar)3 (Mes* = 2,4,6-tri-tert-butylphenyl, Np = neopentyl, Ar = 3,5-Me2C6H3), 1, has previously been reported to lose the P2 unit upon gentle heating, to form (Mes*N)Nb(N[Np]Ar)3, 2. The first-order activation parameters for this process have been estimated here using an Eyring analysis to have the values ΔH = 19.6(2) kcal/mol and ΔS = −14.2(5) eu. The eliminated P2 unit can be transferred to the terminal phosphide complexes PM(N[iPr]Ar)3, 3-M (M = Mo, W), and [PNb(N[Np]Ar)3], 3-Nb, to give the cyclo-P3 complexes (P3)M(N[iPr]Ar)3 and [(P3)Nb(N[Np]Ar)3]. These reactions represent the formal addition of a PP triple bond across a MP triple bond and are the first efficient transfers of the P2 unit to substrates present in stoichiometric quantities. The related complex (OC)5W(Mes*NPP)Nb(N[Np]Ar)3, 1-W(CO)5, was used to transfer the (P2)W(CO)5 unit in an analogous manner to the substrates 3-M (M = Mo, W, Nb) as well as to [(OC)5WPNb(N[Np]Ar)3]. The rate constants for the fragmentation of 1 and 1-W(CO)5 were unchanged in the presence of the terminal phosphide 3-Mo, supporting the hypothesis that molecular P2 and (P2)W(CO)5, respectively, are reactive intermediates. In a reaction related to the combination of PP and MP triple bonds, the phosphaalkyne AdCP (Ad = 1-adamantyl) was observed to react with 3-Mo to generate the cyclo-CP2 complex (AdCP2)Mo(N[iPr]Ar)3. Reactions of the electrophiles Ph3SnCl, Mes*NPCl, and AdC(O)Cl with the anionic, nucleophilic complexes [(OC)5W(P3)Nb(N[Np]Ar)3] and [{(OC)5W}2(P3)Nb(N[Np]Ar)3] yielded coordinated η2-triphosphirene ligands. The Mes*NPW(CO)5 group of one such product engages in a fluxional ring-migration process, according to NMR spectroscopic data. The structures of (OC)5W(P3)W(N[iPr]Ar)3, [(Et2O)Na][{(OC)5W}2(P3)Nb(N[Np]Ar)3], (AdCP2)Mo(N[iPr]Ar)3, (OC)5W(Ph3SnP3)Nb(N[Np]Ar)3, Mes*NP(W(CO)5)P3Nb(N[Np]Ar)3, and {(OC)5W}2AdC(O)P3Nb(N[Np]Ar)3, as determined by X-ray crystallography, are discussed in detail.