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Gold Phosphole Complexes as Efficient Catalysts for Alkyne Activation

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posted on 19.02.2016, 16:19 by Kévin Fourmy, Sonia Mallet-Ladeira, Odile Dechy-Cabaret, Maryse Gouygou
Gold­(I) complexes bearing monophosphole ligands were synthesized, and their electronic and steric properties were compared to those of their triphenylphosphine-based counterparts. Cationic phosphole-based gold­(I) complexes are active and selective in enyne cycloisomerization and in olefin cyclopropanation, with a good correlation between the ligand σ-donor ability and the catalytic activity. For the most efficient ligand, 1-phenyl-2,3,4,5-tetramethylphosphole (TMP), a highly active, selective, and stable cationic [Au­(TMP)­(CH3CN)]­SbF6 complex was isolated.