Manganese-Catalyzed Dehydrogenative Silylation of Alkenes Following Two Parallel Inner-Sphere Pathways
作者:Stefan Weber、Manuel Glavic、Berthold Stöger、Ernst Pittenauer、Maren Podewitz、Luis F. Veiros、Karl Kirchner
DOI:10.1021/jacs.1c09175
日期:2021.10.27
of aromatic and aliphatic alkenes was efficiently and selectively converted into E-vinylsilanes and allylsilanes, respectively, at room temperature. Mechanistic insights are provided based on experimental data and DFT calculations revealing that two parallel reaction pathways are operative: an acceptorless reaction pathway involving dihydrogen release and a pathway requiring an alkene as sacrificial
我们报告了一种无添加剂的 Mn(I) 催化的末端烯烃脱氢硅烷化。最活跃的预催化剂是工作台稳定的烷基双膦 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 Mn-烷基键产生酰基中间体而引发的,该酰基中间体经历硅烷 HSiR 3的快速 Si-H 键断裂形成活性 16e - Mn(I) 甲硅烷基催化剂 [Mn( dippe)(CO) 2 (SiR 3 )] 和游离的丁醛。多种芳香族和脂肪族烯烃被高效选择性地转化为E-乙烯基硅烷和烯丙基硅烷,分别在室温下。基于实验数据和 DFT 计算提供了机理见解,揭示了两条平行的反应途径是有效的:一种涉及氢释放的无受体反应途径和一种需要烯烃作为牺牲氢受体的途径。