Synthesis and Characterization of New Binuclear Co(0) Complexes with Diphosphinoamine Ligands. A Potential Approach for Asymmetric Pauson−Khand Reactions

Abstract

The synthesis of P-N-P bidentate ligands and the evaluation, based on IR and X-ray data, of their pi-acceptor properties in the complexes derived from phenylacetylene-dicobalt hexacarbonyl have been carried out. In addition, the reactivity of these complexes in the Pauson-Khand reaction has been examined.

Group VIII transition metal complexes with the chiral diphosphazane ligand (S)-α-(Ph2P)2N(CHMePh): Synthesis and structural characterization

“…In the coordinated chelate ligand the mean P-N bond lengths [2: av 1.7125(12); 3: av 1.720 (2) (5). Its IR spectrum in KBr shows the carbonyl band m(CO) at 1979 cm À1 .…”

“…X-ray crystal structure of [(g 5 -C 5 H 5 )Fe(CO)-{j 2 -(PPh 2 ) 2 N(CHMePh)}]BF 4 (5) A perspective view of the structure of the cation of complex 5 with the labelling of the atoms is shown in Fig. 4.…”

“…Complexes containing the diphosphazane ligand, S-(Ph 2 P) 2 N(CHMePh), and the organometallic fragments Ni(CO) 2 (1), Cp*M [Rh (2), Ir (3)], (C 6 Me 6 )Ru (4) and CpFeCO (5) have been synthesized and fully characterized by analytical and spectroscopic means. The molecular structures of complexes 2, 3 and 5 have been determined by X-ray diffraction methods.…”

“…In a similar form to the widely used bis(diphenylphosphino)methane (dppm, CH 2 (PPh 2 ) 2 ) the phosphinoamine ligands can bind to metal atoms in different ways: monodentate, chelating or bridging [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Ferrocenylalkynes as ligands in transition metal complexes

“…Some recent examples have used chiral phosphines as ligands in order to increase the stereocontrol of the reaction. 10 Here we report the synthesis of a number of phosphine substituted metal carbonyl moieties using 1,1Ј-bis(diphenyldiphosphino)methane and bis-(diphenylphosphino)ferrocene. The products are phosphine dependent giving the chelated [Co 2 (CO) 4 (µ-η 1 :…”