A Ligand-Free Pt<sub>3</sub>Cluster Catalyzes the Markovnikov Hydrosilylation of Alkynes with up to 10<sup>6</sup>Turnover Frequencies
作者:Miguel A. Rivero-Crespo、Antonio Leyva-Pérez、Avelino Corma
DOI:10.1002/chem.201605520
日期:2017.1.31
The Pt‐catalyzed hydrosilylation of alkynes is the procedure of choice to obtain vinylsilanes, and is claimed to be the most relevant application of Pt in organic synthesis. More than half a century after its discovery, only β‐vinylsilanes (anti‐Markovnikov addition) are obtained with simple Pt catalysts, whereas α‐vinylsilanes (Markovnikov addition) remain elusive compounds. Here the catalysis of
炔烃的Pt催化氢化硅烷化是获得乙烯基硅烷的选择程序,据称是Pt在有机合成中最相关的应用。发现后半个多世纪,仅使用简单的Pt催化剂即可获得β-乙烯基硅烷(抗-Markovnikov加成),而α-乙烯基硅烷(Markovnikov加成)仍是难以捉摸的化合物。在此,Pt 3催化末端炔烃的马尔科夫尼科夫氢化硅烷化据报道,以百万分之几的数量聚集成团,可以以合理的分离产率得到各种α-乙烯基硅烷,其周转频率可以达到每小时一百万。此外,这些α-乙烯基硅烷在充分建立的CC键形成级联反应中具有反应性,其中相应的β-异构体不具有反应性。除了其效率和合成用途外,该催化体系还很好地说明了催化金属的逐原子聚集如何导致给定反应具有不同的选择性。