A series of RuII (η6-arene) complexes with 1,2,3-triazolylidene ligands comprising different aryl and alkyl wingtip groups have been prepared and characterized by NMR spectroscopy, microanalysis, and in one case by X-ray diffraction. All complexes are active catalyst precursors for the oxidation of alcohols to the corresponding aldehydes/ketones without the need of an oxidant or base as additive. The wingtip groups have a direct impact on the catalytic activity, alkyl wingtips providing the most active species while aryl wingtip groups induce lower activity. An N-bound phenyl group was the most inhibiting wingtip group due to cyclometalation. Arene dissociation was observed as a potential catalyst deactivation pathway.
一系列包含不同芳基和烷基侧翼基团的
1,2,3-三唑啉二烯
配体的RuII(η6-
芳烃)配合物已通过NMR光谱、微量分析以及在一种情况下的X射线衍射得以制备和表征。所有配合物均是活性的醇氧化为相应醛/酮的催化剂前体,无需添加氧化剂或碱。侧翼基团对催化活性有直接影响,烷基侧翼基团提供最活跃的物种,而芳基侧翼基团导致较低的活性。氮键合的苯基是抑制性最强的侧翼基团,因为环
金属化作用。观察到
芳烃解离作为潜在的催化剂失活途径。