Pyridine‐Stabilized Rhodium Nanoparticles in Ionic Liquids as Selective Hydrogenation and Transfer Hydrogenation Catalysts
作者:Alejandro Serrano‐Maldonado、Erika Martin、Itzel Guerrero‐Ríos
DOI:10.1002/ejic.201900223
日期:2019.6.30
selectivity. Nitrobenzene was reduced to aniline with dihydrogen in the presence of RhNPs‐I with moderate activity. When the hydrogen source was formic acid‐Et3N azeotrope (transfer hydrogenation) the reaction was completed within minutes with high selectivity. Under transfer hydrogenation conditions, it was possible to apply the catalytic system RhNPs‐I in multistep processes for the generation of substituted
在有机氢前体[Rh(µOMe)COD] 2下,在离子液体[BMIM] [BF 4 ](RhNPs-I至III)中用吡啶基配体稳定的铑纳米颗粒(RhNPs)是由二氢压力合成的。与不含配体的RhNPs-V相比,吡啶稳定的RhNPs尺寸更小,并且在苯乙酮加氢成1-苯基乙醇中表现出更高的活性和选择性。如果使用吡啶封端的RhNPs-I,则该系统可重复使用几次,而不会损失活性和选择性。在RhNPs-I存在下,硝基苯将硝基苯与二氢还原为苯胺适度活动。当氢源为甲酸-Et 3 N共沸物(转移氢化)时,反应可在数分钟内以高选择性完成。在转移加氢条件下,可以将催化体系RhNPs-I应用于多步过程中,通过硝基苯和苯甲醛的还原性N-烷基化反应生成取代的芳基胺。并通过硝基芳烃还原/ Paal-Knorr缩合合成取代的吡咯。