2-pyridonate ligands have been synthesized and their catalytic performance for acceptorless dehydrogenation of alcohols has been investigated under neutral conditions. Electron-withdrawing groups such as methoxycarbonyl, trifluoromethyl, cyano, and nitro groups at the 5-position promoted the acceptorless dehydrogenation of 1-phenylethanol, whereas electron-donating methyl group at the 5-position retarded
已经合成了一系列带有5-和4,5-取代的
2-丙酮酸酯
配体的Cp * Ir配合物,并且已经在中性条件下研究了它们对醇的无受体脱氢的催化性能。在5-位的吸电子基团,例如甲氧基羰基,三
氟甲基,
氰基和硝基,促进了1-苯基
乙醇的无受体脱氢,而在5-位的供电子甲基则阻碍了反应。此外,在4-位引入甲基改善了催化性能。因此,Cp * Ir(5-三
氟甲基-4-甲基-2-
吡啶酮酸酯)Cl(2bc)在所检测的配合物中表现出最高的催化性能,并且对于伯醇的无受体脱氢也显示出良好的催化性能。