Dioxomolybdenum(VI) complexes containing chiral oxazolines applied in alkenes epoxidation in ionic liquids: A highly diastereoselective catalyst
作者:José A. Brito、Sonia Ladeira、Emmanuelle Teuma、Beatriz Royo、Montserrat Gómez
DOI:10.1016/j.apcata.2011.03.024
日期:2011.5
dioxomolybdenum complexes, 2 and 3, containing the bis(oxazoline) B and the oxazolinyl-pyridine C respectively, have been prepared and fully characterized both in solution and solid state, including the single-crystal X-ray diffraction analysis for 2, which represents the first structure of a Mo(VI) complex coordinated to a bis(oxazoline). These complexes, together with the bimetallic system 1, were used
新单金属二氧合钼配合物,2和3,将含有双恶唑啉乙和恶唑啉基吡啶Ç已经分别制备并在溶液中和固相充分表征,包括单晶X射线衍射分析2,它代表与双(恶唑啉)配位的Mo(VI)配合物的第一结构。这些配合物与双金属系统1用作咪唑鎓和吡咯烷鎓类离子液体中烯烃环氧化的催化前体(环辛烯,(R)-柠檬烯,反式β-甲基苯乙烯),对环氧化物的形成具有高化学选择性,主要用于环辛烯和(R) -柠檬烯环氧化,而没有形成相应的二醇。在[BMP] [NTf 2 ](BMP =丁基甲基吡咯烷鎓; NTf 2 =双(三氟甲磺酰基)酰胺)中,配合物1仅生成反式(R)-柠檬烯1,2-环氧化物,而单金属催化体系导致低的非对映选择性。95 Mo NMR研究有助于了解1和2在离子液体介质中的催化行为。