Bis dimethylphosphino propane

A 500-ml., three-necked, round-bottomed flask is charged with 300 ml. of anhydrous liquid ammonia and equipped with a Dry 

The bis(phosphine) forms stable complexes with a large number of transition metals. For example, the five-coordinate [ML2X]+(M = Ni, Co) and the six-coordinate trans-[CoL2 X2 ]+ complexes have been characterized.10 

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The synthesis, characterization, and the relative thermodynamic hydricities of hydridoplatinum(II) species-containing bidentate phosphine ligands [PtHL2]+ (L2 = dppe, depe, dmpe, l,3-bis(dimethylphosphino)propane [dmpp]) have been determined, with the best hydride donor found to be [PtH(dmpe)2]+.365... 

An interesting Ni(II) complex is the bis(dimethylphosphino)propane complex [Ni(dmpp)i]2 +. As illustrated in Figure 100, it possesses a geometry intermediate between planar and tetrahedral in that the dihedral angle between the two coordinated dmpp ligands is about 44°.154... 

Although the reaction conditions of the acylstannylation of 1,3- and 1,2-dienes cannot be applied to the corresponding reaction of alkynylstannanes as they stand, the alkynylstannylation of 1,2-dienes takes place in the presence of a catalytic amount of a nickel(O) complex coordinated by a 1,3-diphosphinopropane ligand (Scheme 5.7.27). " The substituents on the phosphorus atom of the diphosphine ligands markedly affect the selection of allene double bonds a Ni-DPPP catalyst favors the internal double bond of allenes, whereas l,3-bis(dimethylphosphino)propane (DMPP) prefers to react at the terminal double bonds to give (Z)-alkenylstannanes selectively. Various aryl- and silyl-ethynylstannanes add to mono-, di- and non-substimted allenes. 

Et = ethyl dcpe = l,2-Bis(dicyclohexylphosphino)ethane diars l,2-Bis(dimethylarsino)benzene diphos 1,2-Bis (dimethylphosphino)benzene dppm = Bis(diphenylphos-phino)methane dppp = l,3-bis(diphenylphosphino)propane PCyj = tricyclohexylphosphine Ph = phenyl Ptob = tris(4-methylphenyl)phosphine bdt = benzenedithiolate. 

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