alpha,beta-(phosphino)(aminocarbene) and alpha,omega-(phosphino)(oxyaminocarbene): new bidentate ligands for transition metal complexes

摘要

Direct complexation of (amino)(phosphino)carbene la and (amino)(oxy)carbene 1b featuring a phosphino group in position-6 to the carbene with [Rh(CO)(2)Cl](2) has been studied. With the 1,2-bidentate ligand 1a, an original cationic complex 2 featuring two (amino)(phosphino)carbenes eta(2)-bonded to the metal has been isolated in 79% yield. In the case of the 1,6-bidentate ligand 1b, a rhodium(1) complex 3 in which the carbene is in trans position relative to the CO ligand was obtained in 85% yield. Both compounds were fully characterized including X-ray diffraction studies. (C) 2004 Elsevier B.V. All rights reserved.