Nickel‐Catalyzed Stereodivergent Synthesis of
<i>E</i>
‐ and
<i>Z</i>
‐Alkenes by Hydrogenation of Alkynes
作者:Kathiravan Murugesan、Charles Beromeo Bheeter、Pim R. Linnebank、Anke Spannenberg、Joost N. H. Reek、Rajenahally V. Jagadeesh、Matthias Beller
DOI:10.1002/cssc.201900784
日期:2019.7.19
alkynes to E‐ and Z‐alkenes by using nickel catalysts was developed. Simple Ni(NO3)2⋅6 H2O as a catalyst precursor formed active nanoparticles, which were effective for the semihydrogenation of several alkynes with high selectivity for the Z‐alkene (Z/E>99:1). Upon addition of specific multidentate ligands (triphos, tetraphos), the resulting molecular catalysts were highly selective for the E‐alkene products
开发了一种使用镍催化剂将炔烃立体发散氢化为E-和Z-烯烃的便捷方案。简单的Ni(NO 3 ) 2 ⋅6 H 2 O作为催化剂前体形成活性纳米粒子,可有效地对多种炔烃进行半加氢,并且对Z-烯烃具有高选择性( Z / E > 99:1)。添加特定的多齿配体(三磷、四磷)后,所得分子催化剂对E-烯烃产物具有高度选择性(E/Z > 99:1)。机理研究表明Z-烯烃选择性催化剂是非均相的,而E-烯烃选择性催化剂是均相的。在后一种情况下,炔烃首先被氢化为Z-烯烃,随后异构化为E-烯烃。该提议得到了密度泛函理论计算的支持。这种合成方法被证明普遍适用于超过 40 个例子,并且可扩展到多克规模的实验。