Cathodic reductive couplings and hydrogenations of alkenes and alkynes catalyzed by the B12 model complex
作者:Hisashi Shimakoshi、Zhongli Luo、Kazuya Tomita、Yoshio Hisaeda
DOI:10.1016/j.jorganchem.2017.02.002
日期:2017.6
5-dimethylpyrroline N-oxide (DMPO) revealed that the cobalt-hydrogen complex (CoH complex) should be formed during the electrolysis and it functioned as an intermediate for the alkene reduction. The electrolysis was also applied to an alkyne, such as phenylacetylene, to form 2,3-diphenylbutane (racemic and meso) and ethylbenzene via styrene as reductive coupling and hydrogenated products, respectively.
B- 12模型配合物,高氯酸盐高氯酸盐(1),在-0.7 V vs。的电解条件下,在酸的存在下,催化烯烃的还原偶联和氢化。乙腈中的Ag / AgCl。共轭烯烃在电解过程中表现出良好的反应活性,形成还原产物。产物分布取决于烯烃的C C键上的取代基。使用5,5-二甲基吡咯啉N-氧化物(DMPO)的ESR自旋捕集实验表明,钴-氢络合物(CoH配合物)应在电解过程中形成,并作为烯烃还原的中间体。电解还应用于炔烃,例如苯乙炔,分别通过苯乙烯作为还原偶联剂和氢化产物形成2,3-二苯丁烷(外消旋和内消旋)和乙苯。