Abstract
Novel C−C coupling products are afforded from the reaction of tris(pyrazolyl)borate ruthenium complexes, containing the phosphinoamine ligands Ph2PCH2CH2NMe2, Ph2PCH2CH2NEt2, and Ph2PCH2CH2NiPr2, with terminal acetylenes (see scheme). The coupling takes place regioselectively at the γ-carbon atom of the phosphinoamine ligand and, depending on the steric requirments of R, either at the internal or terminal carbon atom of the acetylene molecule. All these reactions proceed in a highly diastereoselective fashion.
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