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Issue 36, 2010
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An approach to bimetallic catalysts by ligand design

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New diphosphines based on benzofurobenzofuran and dibenzodioxocin backbones, forming exclusively bimetallic complexes were designed and synthesized. Depending on the ligand to metal ratio, face-to-face bimetallic complexes or syn-chloride bridged dimeric complexes were formed as main reaction products. The structures of the rhodium complexes of the new ligands 4, 7, 10, 13, 16 were established in solution by NMR, IR, and MS spectroscopy. The molecular structures of the syn-chloride bridged dimeric complexes [Rh2(CO)2(μ-Cl)2(4)] (22), [Rh2(CO)2(μ-Cl)2(10)] (24), and the face-to-face bimetallic complexes [Rh(CO)Cl(4)]2 (17), [Rh(CO)Cl(10)]2 (19), and [Rh(CO)Cl(13)]2 (20) were confirmed by X-ray crystallography. Ligands 4, 7, 10, 13, 16, and SPANphos were tested in rhodium catalyzed methanol carbonylation at 150 °C and 22 bar of CO gas, showing high activities under catalytic conditions.

Graphical abstract: An approach to bimetallic catalysts by ligand design

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The article was received on 20 Feb 2010, accepted on 16 Jul 2010 and first published on 10 Aug 2010

Article type: Paper
DOI: 10.1039/C0DT00011F
Dalton Trans., 2010,39, 8560-8574

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    An approach to bimetallic catalysts by ligand design

    J. M. López-Valbuena, E. C. Escudero-Adan, J. Benet-Buchholz, Z. Freixa and P. W. N. M. van Leeuwen, Dalton Trans., 2010, 39, 8560
    DOI: 10.1039/C0DT00011F

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