Dimethylphenylphosphine , reductive

TaCl593 reacted with metallic sodium in neat trimethylphosphine to give the phosphinocarbene tantalum complexes 100 and 101, respectively. These reactions are the first examples of double activation of coordinated trimethylphosphine via oxidative cleavage of a substituent methyl C-H bond. A similar process was also observed in the reduction of tantalum pentabrom-ide with magnesium turnings in the presence of dimethylphenylphosphine.94... 

The reduction of mer-trichlorotris(dimethylphenylphosphine)rhenium-(III)1 3 with sodium tetrahydroborate(l —), as described below, provides a clean synthesis of tris(dimethylphenylphosphine)pentahydridorhenium(V),... 

N-MeTTP)FeIVLL undergoes reduction when treated with tertiary phosphines. Addition of a large excess of dimethylphenylphosphine to a solution of N-Me lTPFeIVLL results in conversion of the spectrum... 

The reaction of the zero-valent osmium complex Os(CO)3(PPh3)2 with a series of strong acids (HX) has produced cationic hydrido-species of the type [Os(H)(CO)3(PPh3)2]X, where X = Br-, CIO4-, BF4-, or PF -. The complexes behave as 1 1 electrolytes in nitrobenzene and may be reconverted to the zerovalent complex on the action of base. Ammonia and primary amines (A) react with complexes of the type [MX3(PR3)3], where M = Os or Ru, in ethanol at 20 °C to form the M" species mer-[MX2(A)(PR3)a] and acetaldehyde. Secondary and tertiary amines with dimethylphenylphosphine ligands also cause reduction, but in this case the product is an alcohol complex. The reduction is considered to occur via formation of a hydride complex since some hydrogen is formed in all reactions and steric factors probably control whether an amine or an alcohol complex is formed. 

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