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標題: Synthesis of cobalt-containing monodentate phosphine ligand and application toward Suzuki cross-coupling reactions
作者: Hong, F.E.
Ho, Y.J.
Chang, Y.C.
Huang, Y.L.
關鍵字: Suzuki reaction;palladium complex;bulky phosphine ligand;cobalt-containing complex;alkyne-bridged dicobalt complex;homogeneous;catalysis;c-o bond;palladium-catalyzed arylation;resonance energy-transfer;highly-active catalyst;aryl chlorides;room-temperature;arylboronic;acids;reductive elimination;mild conditions;heck reactions
Project: Journal of Organometallic Chemistry
期刊/報告no:: Journal of Organometallic Chemistry, Volume 690, Issue 5, Page(s) 1249-1257.
A bulky, dicobalt complexed, mono-dentate phosphine, [(mu-PPh2CH2PPh2)Co-2(CO)(4)](mu,eta-PhC&3bond; CPCy2) (4), was prepared from the reactions of the bis(diphenylphosphino)methylene (dppm)-bridged dicobalt complex Co-2(CO)(6)(mu-Ph2PCH2PPh2 (2) with PhC&3bond; CPCy2 (3). Combination of 4 and Pd(OAc)(2) (1:1) gave an active catalyst for the palladium-catalyzed Suzuki coupling of aryl bromides with phenylboronic acid; the catalytic reactions can be performed even under low catalyst loadings (0.1-0.001 mol% 4/ Pd(OAc)(2)). Compound 4 has been proved to be an authentic and effective mono-dentate phosphine ligand. Crucial factors such as 4/Pd(OAc)(2) ratio, base being used, solvent volume, temperature, and electronic variation of the aryl bromides in reactions were also investigated and results are reported. (c) 2004 Elsevier B.V. All rights reserved.
ISSN: 0022-328X
DOI: 10.1016/j.jorganchem.2004.11.030
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