[Ir2(H)(CO)3(μ-CCHMe)(dppm)2][CF3SO3]. Reaction of 1 with an excess of acetylene results in the incorporation of two acetylene molecules, giving [Ir2(CH3)(C2H)(CO)2(μ-H)(μ-CCH2)(dppm)2][CF3SO3], containing terminal methyl and acetylide ligands and bridging hydride and vinylidene groups. Reaction of 1 with a number of internal, nonactivated alkynes results first in the formation of the alkyne-bridged products
甲基络合物[Ir 2(CH 3)(CO)(μ-CO)(
DPPM)2 ] [CF 3 SO 3 ](1)易于与各种
炔烃分子反应。使用含有吸电子取代基的
炔烃(RC⋮CR'; R = R'= CO 2 Me,CF 3 ; R = CO 2 Me,R'= H),
炔烃桥联产物[Ir 2(CH 3)结果为(CO)2(μ-炔)(
DPPM)2 ] [CF 3 SO 3 ]。与其他1-
炔烃(HC⋮CR,R = Me,Ph)在-80°C下反应导致氧化加成反应生成
乙炔氢化物[Ir 2 H(
CH3)(CO)2(μ-C 2 R)(
DPPM)2 ] [CF 3 SO 3 ],其在升温经历
氢化物配体与
乙炔化的β碳的转移以得到亚
乙烯基桥连的产品。在环境温度下的
甲烷消除发生时,产生的
乙炔化物桥连的“A帧”,的[Ir 2(CO)2(μ-C 2 R)(
DPPM)2 ] [CF 3 SO 3 ]。反应11当量的
乙炔通过类似的
乙炔