diphenylphosphinopropane}, are efficient catalysts for vinylation of pyrazoles by alkynes. While the 1-catalyzed reaction is trans-selective, the corresponding 2-catalyzed reaction is cis-selective. The experimental results have been rationalized by density functional theory calculations.
钌(II)络合物,[Ru(dppe)(PPh 3)(CH 3 CN)2 Cl] [BPh 4 ] dppe =
二苯基膦基乙烷}(1)和[Ru(dppp)2(CH 3 CN)Cl] BPh 4 ](2)dppp =
二苯基膦基丙烷},是
炔烃使
吡唑类
乙烯基化的有效催化剂。虽然1-催化的反应是反式选择性的,但是相应的2-催化的反应是顺式-选择性的。实验结果已经通过密度泛函理论计算得到了合理化。