Chromium-Copper Exchange of Fischer Carbene Complexes: X-Ray Crystal Structure of a [Cu{=CR(1)(OR(2))}(MeCN)(Et(2)O)][PF(6)] Complex This work was supported by DGICYT (PB97-1271) and CICYT (BQU2000-0219). O.L. thanks the Fonds der Chemischen Industrie for a postdoctoral fellowship. - Barluenga J; López LA; Löber O; Tomás M; García-Granda S; Alvarez-Rúa C; Borge J (Angewandte Chemie (International ed. in English), 2001)