Patent ID: 7777059

Claim:
A copper(I) formate complex of the formula L n Cu(HCOO).x HCOOH, where x is from 0 to 10, n is 1, 2, 3 or 4 and the n ligands L, independently of one another, are each one of the following ligands: a phosphane of the formula R 1 R 2 R 3 P; a phosphite of the formula (R 1 O)(R 2 O)(R 3 O)P; an isocyanide of the formula R 1 —NC; an alkene of the formula R 1 R 2 C═CR 3 R 4 ; or an alkyne of the formula R 1 C≡CR 2 ; where R 1 , R 2 , R 3 and R 4 , independently of one another, are hydrogen, a linear or branched, optionally partly or completely fluorinated alkyl, aminoalkyl, alkoxyalkyl, hydroxyalkyl, phosphinoalkyl or aryl radical of one to 20 carbon atoms; with the exception of triphenylphosphinocopper(I) formate and 1,1,1-tris(diphenyl-phosphinomethyl)ethanecopper(I) formate.