Abstract
A bulky, dicobalt complexed, mono-dentate phosphine, [(μ-PPh 2CH 2PPh 2)Co 2(CO) 4](μ,η-PhC CPCy 2) ( 4), was prepared from the reactions of the bis(diphenylphosphino)methylene (dppm)-bridged dicobalt complex Co 2(CO) 6(μ-Ph 2PCH 2PPh 2) ( 2) with PhC CPCy 2 ( 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.
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