Dioxomolybdenum(VI) complexes with naphtholate-oxazoline ligands in catalytic epoxidation of olefins
作者:Pedro Traar、Jörg A. Schachner、Bernhard Stanje、Ferdinand Belaj、Nadia C. Mösch-Zanetti
DOI:10.1016/j.molcata.2014.01.009
日期:2014.4
1-hydroxy-naphthoic acid. Complexes 3a-b were synthesized starting from [MoO2(acac)2] and obtained in good yields as air and moisture stable solids. The molecular structure of both complexes 3a-b were determined by single crystal X-ray diffraction analysis, showing the expected octahedral coordination of the Mo center by two bidentate ligands of 2a or 2b and two terminal oxo ligands. Interestingly, for complex 3b two
描述了两个新的二氧钼钼(VI)配合物[MoO 2(L)2 ](3a-b)的合成,表征和催化环氧化实验,这些配合物配有O,N-双齿萘甲酸酯-恶唑啉配体L = 2a-b。配体2a-b(2a = 2-(4,5-二氢恶唑-2-基)萘-1-醇,2b = 2-(4,4-二甲基-4,5-二氢恶唑-2-基)萘-1 (1-ol)是通过两步合成法从1-羟基萘甲酸开始获得的。配合物3A-B合成从[开始的MoO 2(乙酰丙酮)2],并以稳定的空气和湿气形式获得高收率。通过单晶X射线衍射分析确定了两种配合物3a-b的分子结构,显示了由2a或2b的两个双齿配体和两个末端的氧代配体所预期的Mo中心的八面体配位。有趣的是,对于复杂3B与问候的双齿配体(的取向两个不同的配位异构Ñ,ñ -反式3B和Ñ,ñ -顺式3B “),分别在固体状态获得。两个复合体3a-b叔丁基氢过氧化物在0.05 mol%的低催化剂负载量下,在