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首页> 外文期刊>ACS catalysis >Highly Chemo- and Stereoselective Transfer Semihydrogenation of Alkynes Catalyzed by a Stable, Well-Defined Manganese(II) Complex
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Highly Chemo- and Stereoselective Transfer Semihydrogenation of Alkynes Catalyzed by a Stable, Well-Defined Manganese(II) Complex

机译:通过稳定,定义的锰(II)复合物催化催化的炔烃的高度化学和立体选择性转移半氢化

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摘要

Herein we report unprecedented manganese-catalyzed semihydrogenation of internal alkynes to (Z)-alkenes using ammonia borane as a hydrogen donor. The reaction is catalyzed by a pincer complex of the earth-abundant manganese(II) salt in the absence of any additives, base, or superhydride. The ammonia borane smoothly reduces the manganese precatalyst [Mn(II)-PNP][Cl](2) to the catalytically active species [Mn(I)-PNP]-hydride in the triplet spin state. This manganese hydride is highly stabilized by complexation with the alkyne substrate. Computational density functional theory (DFT) analysis studies of the reaction mechanism rationalize the origin of stereoselectivity toward formation of (Z)-alkenes.
机译:在此,我们将前所未有的锰催化的内炔醇催化的半水溶生使用氨基硼烷作为氢供体的氨炔烃至(Z)烷烃。 在没有任何添加剂,碱或超乙内氢化物的情况下,通过土富锰(II)盐的钳子络合物催化反应。 氨气硼烷在三重旋塞状态下平滑地将锰预催化剂[Mn(II)-PNP] [Cl](2)降低至催化活性物质[Mn(I)-PNP]-rydry。 通过与炔基基材的络合络合,该氢化物高度稳定。 反应机制的计算密度泛函理论(DFT)分析研究将立体选择性朝向(Z) - 烯烃形成的原因来合理化。

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