Combined Experimental/Computational Study of Iridium and Palladium Hydride PP(O)P Pincer Complexes
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The diphosphine–phosphine oxide {[o-iPr2P(C6H4)]2P(O)H} (1) has been prepared, and its coordination to Ir and Pd has been explored. Using [IrCl(cyclooctene)2]2, the pincer hydride complex {(o-iPr2PC6H4)2P(O)]IrHCl} (2) is readily obtained by phosphine-assisted P(O)–H bond activation. Coordination of CO to Ir affords the corresponding octahedral complex {(o-iPr2PC6H4)2P(O)]IrHCl(CO)} (3) as a single stereoisomer. The electronic properties of the PP(O)P ligand have been compared with those of related PEP frameworks on the basis of νCO stretching frequencies. Treatment of 1 with [Pd(PtBu3)2] gives the palladium hydride complex {(o-iPr2PC6H4)2P(O)]PdH} (4). The mechanism of P(O)–H bond activation at Pd has been investigated computationally. Complex 4 reacts with methyl acrylate at room temperature, giving {(o-iPr2PC6H4)2P(O)]PdCH(Me)CO2Me} (7) as the result of regioselective insertion into the Pd–H bond.
