Cumulative author index

Reactions of L₂M(CO)X (L = Ph₃P, PhMe₂P, Ph₃As; M = Rh^I, Ir^I and X = Cl, Br, I) with

(n = 4 for R = R′ = CH₃; n = 2 for R = R′ = p-tolyl and for R = CH₃ and R′ = p-tolyl) afford the novel complexes

in which three-coordinate Cu^I is directly bonded to the five-coordinate metal atom M^I. The M^I→Cu^I donor bond is bridged by the azenido group. The halide atom X has migrated from the metal atom to the copper atom.Possible mechanisms for the formation of these complexes and of related new formamidine and trifluoroacetate compounds are considered and the properties of the complexes are discussed.