The reactions of [Pd2Cl2(μ-PP)2] (PP = dppm, dmpm) with Et2NC≡CNEt2 in methylene chloride solution: X-ray crystal structures of [Pd2Cl2(μ-CH2)(μ-dppm)2] and hexakis(diethylamino)benzene, C6(NEt2)6

Article abstract of DOI:10.1139/v96-260

The binuclear palladium(I) complex, [Pd₂Cl₂(μ-dppm)₂] (dppm = bis(diphenylphosphino)methane), has been shown to react with bis(diethylamino)acetylene, Et₂NC≡CNEt₂, in methylene chloride solution to yield two isolable products, the known methylene-bridged complex, [Pd₂Cl₂(μ-CH₂)(μ-dppm)₂], and hexakis(diethylamino)benzene, C₆(NEt₂)₆, both of which have been characterized crystallographically. The source of the bridging methylene group in [Pd₂Cl₂(μ-CH₂)(μ-dppm)₂] has been shown to be the methylene chloride solvent. A mechanism that accounts for the formation of the two isolable products is proposed. The complex, [Pd₂Cl₂(μ-dmpm)₂] (dmpm = bis(dimethylphosphino)methane), was similarly found to react with Et₂NC≡CNEt₂ in methylene chloride solution to yield [Pd₂Cl₂(μ-CH₂)(μ-dmpm)₂], which was identified spectroscopically.