Synthesis and application of ortho-palladated complex of (4-phenylbenzoylmethylene)triphenylphosphorane as a highly active catalyst in the Suzuki cross-coupling reaction
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AbstractThe ortho-metallated complex [Pd(μ-Cl){κ2(C,C)-[C6H4(PPh2CHC(O)C6H4-Ph-4)}]2 (2a) was prepared by refluxing of Pd(OAc)2 and {(Ph)3PCHCOC6H4-Ph-4} (PhBPPY) of in CH2Cl2 followed by addition of an excess of KCl in MeOH Complex (2a) reacts with triphenylphosphine to give the mononuclear derivative [Pd(Cl)(PhC6H4COCHPPh2C6H4)(PPh3)] (3a) whose crystal structure has been determined by single crystal X-ray diffraction. The Suzuki reactions of aryl bromides and chlorides of varying electron density using complex (3a) as an efficient catalyst were performed, giving the cross-coupling products in good to excellent yields.

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