NHC-stabilised Rh nanoparticles: Surface study and application in the catalytic hydrogenation of aromatic substrates
作者:Francisco Martinez-Espinar、Pascal Blondeau、Pau Nolis、Bruno Chaudret、Carmen Claver、Sergio Castillón、Cyril Godard
DOI:10.1016/j.jcat.2017.08.010
日期:2017.10
reaction conditions. However, this catalytic system exhibited much lower activity in the hydrogenation of substituted phenols. Pyridine was easily hydrogenated under mild conditions and interestingly, the hydrogenation of 4-methyl and 4-trifluoromethylpyridine resulted slower than that of 2-methylpyridine. The hydrogenation of 1-(pyridin-2-yl)propan-2-one provided the β-enaminone 13a in high yield as a consequence
新的Rh-的NP稳定的N-杂环卡宾(NHC)通过的[Rh(η分解合成3 -C 3 H ^ 5)3 1 H下2气氛和完全表征。还进行了使用同位素标记的配体通过FT-IR和NMR光谱进行的表面研究。相对湿度0.2NP是还原各种芳族底物的活性催化剂。在苯酚的还原中,取决于反应条件,获得了对环己酮或环己醇的高选择性。但是,该催化体系在取代酚的氢化中表现出低得多的活性。吡啶在温和条件下容易氢化,有趣的是,4-甲基和4-三氟甲基吡啶的氢化反应比2-甲基吡啶的氢化反应慢。1-(吡啶-2-基)丙-2-酮的氢化提供了β-烯胺酮13a吡啶环部分还原,然后异构化的结果是高收率。通过调节反应条件,可以将喹啉部分氢化为1,2,3,4-四氢喹啉或完全还原为十氢喹啉。