Chemoselective Hydrogenation of Aldehydes under Mild, Base-Free Conditions: Manganese Outperforms Rhenium
作者:Mathias Glatz、Berthold Stöger、Daniel Himmelbauer、Luis F. Veiros、Karl Kirchner
DOI:10.1021/acscatal.8b00153
日期:2018.5.4
catalysts for the homogeneous chemoselective hydrogenation of aldehydes. Among these, [Mn(PNP-iPr)(CO)2(H)] was found to be one of the most efficient base metal catalysts for this process and represents a rare example which permits the selective hydrogenation of aldehydes in the presence of ketones and other reducible functionalities, such as C=C double bonds, esters, or nitriles. The reaction proceeds
几种氢化物Mn(I)和Re(I)PNP钳形配合物用作醛的均相化学选择性氢化的催化剂。其中,[Mn(PNP-iPr)(CO)2(H)]被发现是该方法中最有效的贱金属催化剂之一,是一个罕见的例子,它允许在酮存在下对醛进行选择性加氢以及其他可还原的官能团,例如C = C双键,酯或腈。反应在室温下在无碱条件下进行,催化剂负载量为0.1至0.05 mol%,氢气压力为50 bar(TON达到2000)。提出了一种涉及外球氢化物转移和可逆PNP配体去质子化/质子化的机理。类似的等电子和同构Re(I)配合物的活性很差。