An anion controlled stereodivergent semi-hydrogenation of alkynes is reported. The reactions are catalyzed by the low-cost and stable nickel(II) salts, using water as environmental friendly hydrogen source with zinc powder as metal reductant. Interestingly, the stereoselectivity of the reaction is well controlled by the anion of the nickel(II) salt. The present methodology allowed a low-cost and convenient preparation of trans- and cis-alkenes under mild conditions. The reaction mechanism is proposed with water as the hydrogen donor on the basis of the control experiments.

中文翻译：

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以水为氢源的炔烃的阴离子控制立体发散半氢化

报道了炔烃的阴离子控制的立体发散半氢化。该反应由低成本且稳定的镍（II）盐催化，以水为环保氢源，锌粉为金属还原剂。有趣的是，反应的立体选择性是由镍 (II) 盐的阴离子很好地控制的。本方法允许一个低成本和制备方便反式-和顺温和条件下链烯烃。在对照实验的基础上提出了以水为供氢体的反应机理。