THE REACTIONS OF [PD2CL2(MU-PP)(2)] (PP EQUALS DPPM, DMPM) WITH ET(2)NC-CNET(2), IN METHYLENE-CHLORIDE SOLUTION - X-RAY CRYSTAL-STRUCTURES OF [PD2CL2(MU-CH2)(MU-DPPM)(2)] AND HEXAKIS(DIETHYLAMINO)BENZENE, C-6(NET(2))(6)

The binuclear palladium(I) complex, [Pd2Cl2(mu-dppm)(2)] (dppm = bis(d iphenylphosphino)methane), has been shown to react with bis(diethylami no)acetylene, Et(2)NC=CNEt(2), in methylene chloride solution to yield two isolable products, the known methylene-bridged complex, [Pd2Cl2(m u-CH3(mu-dppm)(2)], and hexakis(diethylamino)benzene, C-6(NEt(2))(6), both of which have been characterized crystallographically. The source of the bridging methylene group in [Pd2Cl2(mu-CH2)(mu-dppm)(2)] has b een shown to be the methylene chloride solvent. A mechanism that accou nts for the formation of the two isolable products is proposed. The co mplex, [Pd2Cl2(mu-dmpm)(2)] (dmpm = bis(dimethylphosphino)methane), wa s similarly found to react with Et(2)NC=CNEt(2) in methylene chloride solution to yield [Pd2Cl2(mu-CH2)(mu-dmpm)(2)], which was identified s pectroscopically.