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New approaches to high-activity transition-metal catalysts for carbon–carbon bond forming reactions. Rhenium-containing phosphorus donor ligands for palladium-catalyzed Suzuki cross-couplings

Author:
Sandra Eichenseher, Klemenz Kromm, Olivier Delacroix, J. A. Gladysz
Source:
Chemical communications 2002 v. no.10 pp. 1046-1047
ISSN:
1364-548X
Subject:
catalysts, catalytic activity, chemical bonding, chemical reactions, ligands, moieties, nitric oxide, organobromine compounds, palladium, phosphorus, rhenium, toluene
Abstract:
The rhenium complexes (η⁵-C₅H₅)Re(NO)(PPh₃)((CH₂)ₙPR₂:) (n/R = 0/Ph, 0/t-Bu, 0/Me, 1/Ph, 1/t-Bu), which contain electron-rich and sterically congested phosphido moieties, give active catalysts for the title reaction; typical conditions (toluene, 60–100 °C): aryl bromide (1.0 equiv.), PhB(OH)₂ (1.5 equiv.), K₃PO₄ (2.0 equiv.), Pd(OAc)₂ (1 mol%), and a Re(CH₂)ₙPR₂: species or a 1∶2 [Re(CH₂)ₙPR₂H]⁺X⁻/t-BuOK mixture (4 mol% rhenium).
Agid:
6572348