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无共氧化剂参与条件下,以氧气为氧化剂,在含膦或含氮配体功能化离子液体和普通离子液体(溶剂)组成的混合体系中,RuCl3·3H2O能有效催化多种醇的选择氧化,高选择性地生成相应的醛或酮.其中,配位能力较弱的含氮配体功能化离子液体更有利于提高钌催化剂的活性和选择性,但体系无法有效实现钌催化剂的循环使用.配体功能化离子液体本身的氧化降解是导致钌催化剂失活的根本原因.
In the absence of co-oxidant, RuCl3 · 3H2O can effectively catalyze the selective oxidation of various alcohols in a mixed system consisting of a functionalized ionic liquid containing a phosphine or a nitrogen-containing ligand and an ordinary ionic liquid (solvent) using oxygen as an oxidizing agent, The corresponding aldehydes or ketones are formed with high selectivity.Among them, the functionalized ionic liquid containing nitrogen ligand with weaker coordination ability is more conducive to improve the activity and selectivity of the ruthenium catalyst, but the system can not effectively achieve the recycling of the ruthenium catalyst. The oxidative degradation of the ligand-functionalized ionic liquid itself is the root cause of the deactivation of the ruthenium catalyst.