Rethinking Basic Concepts—Hydrogenation of Alkenes Catalyzed by Bench-Stable Alkyl Mn(I) Complexes
作者:Stefan Weber、Berthold Stöger、Luis F. Veiros、Karl Kirchner
DOI:10.1021/acscatal.9b03963
日期:2019.11.1
intermediate which undergoes rapid hydrogenolysis to form the active 16e Mn(I) hydride catalyst [Mn(dippe)(CO)2(H)]. A range of mono- and disubstituted alkenes were efficiently converted into alkanes in good to excellent yields. The hydrogenation of 1-alkenes and 1,1-disubstituted alkenes proceeds at 25 °C, while 1,2-disubstituted alkenes require a reaction temperature of 60 °C. In all cases, a catalyst loading
描述了一种有效的无添加剂锰催化的分子氢将烯烃氢化为烷烃的方法。该反应是原子经济的,实现了廉价的,富含地球的非贵金属催化剂。最有效的前催化剂是长凳稳定的烷基双膦Mn(I)配合物fac- [Mn(dippe)(CO)3(CH 2 CH 2 CH 3)]。催化过程是通过将CO配体迁移插入M n-烷基键中而产生的酰基中间体,该中间体经过快速氢解后形成活性16e Mn(I)氢化物催化剂[Mn(dippe)(CO)2(H)]。各种单取代和二取代的烯烃以良好或优异的收率有效地转化为烷烃。1-烯烃和1,1-二取代烯烃的氢化反应在25°C进行,而1,2-二取代烯烃的反应温度为60°C。在所有情况下,均施加2mol%的催化剂负载和50bar的氢气压力。提出了一种基于DFT计算的机制,并得到了初步的实验研究的支持。