Palladium hydride complexes

Abstract
The stable colourless crystalline complex, (Et3P)2Pd(H)Cl is obtained by the reduction of (Et3P)2PdCl2 with trimethylgermane at 40°. Reduction of (Et3P)2PdBr2 is slow unless palladium black is added. The analogous reaction with (Et3P)2NiBr2 gives a highly unstable nickel hydride complex. The reactions are considered to follow a radical chain mechanism. The reactions of (Et3P)2Pd(H)Cl with the following are reported: Kl, HCl–Et2O, NH3–H2O, CCl4, MeSH–KCN, and MeOH–KCN. Unsaturated compounds (CH2:CHCN, PhC⋮CH, C2F4, C4H6) also react with it to give a complexity of products.

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