A neutral rhodium(I) complex, ‘RhCl(PPh3)2’ generated by the combination of [RhCl(C2H4)2]2 with a fourfold amount of PPh3, effectively catalyzed the cyclocotrimerization of alkynes (1) and isocyanates (2) to give 2-pyridones (3) and/or pyrimidine-2,4-diones (4), selectively, by controlling the molar ratio of alkynes (1) and isocyanates (2).
由[RhCl(C 2 H 4)2 ] 2与四倍量的PPh 3结合生成的中性铑(I)络合物'RhCl(PPh 3)2 '有效催化了炔烃(1)和异氰酸酯(2),通过控制炔烃(1)和异氰酸酯(2)的摩尔比,有选择地生成2-吡啶酮(3)和/或嘧啶-2,4-二酮(4)。