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- W2051237405 abstract "The dinuclear complex (RPh[NPN]Ta)2(μ-H)4 (where RPh[NPN] = [RP(CH2SiMe2NPh)2] and R = Ph, Cy) shows remarkable reactivity with molecular nitrogen, producing the side-on end-on bound dinitrogen complex (RPh[NPN]Ta)2(μ-η1:η2-N2)(μ-H)2. This tantalum tetrahydride also promotes other small molecule activation. Addition of secondary phosphines HPR‘2 (R‘ = Ph, Cy) to (RPh[NPN]Ta)2(μ-H)4 accesses trihydride phosphide systems (RPh[NPN]Ta)2(μ-H)3(μ-PR‘2). Addition of primary phosphines H2PR‘ ‘ (R‘ ‘ = Cy, Ad) gives bridging phosphinidene tantalum complexes (RPh[NPN]Ta)2(μ-H)2(μ-PR‘ ‘). Molecular structures as determined by X-ray crystallography for the complexes (PhPh[NPN]Ta)2(μ-H)3(μ-PCy2) and (CyPh[NPN]Ta)2(μ-H)2(μ-PAd) are presented. Isotopic labeling studies offer mechanistic insights into the reactivity of this tetrahydride system. Reaction of Cy2PH with (CyPh[NPN]Ta)2(μ-D)4, for instance, gives solely the monohydride dideuteride complex (CyPh[NPN]Ta)2(μ-H)(μ-D)2(μ-PCy2). This labeling study indicates that D2 loss forms the reactive species, (CyPh[NPN]Ta)2(μ-D)2, which promotes small molecule activation. Addition of CyPH2 to (CyPh[NPN]Ta)2(μ-D)4 gives a series of isotopomers, with an average composition of 0.67 H and 1.33 D, supporting a 1,2-H2 elimination step to form the tantalum phosphinidenes. These results are tied into the general reactivity of (RPh[NPN]Ta)2(μ-H)4." @default.
- W2051237405 created "2016-06-24" @default.
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- W2051237405 date "2005-03-01" @default.
- W2051237405 modified "2023-09-23" @default.
- W2051237405 title "Addition of Primary and Secondary Phosphines to Dinuclear Tantalum Hydrides: Synthesis of Phosphides and Phosphinidenes via P−H Bond Activation" @default.
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- W2051237405 doi "https://doi.org/10.1021/om0490076" @default.
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