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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >Molybdenum(VI) cis-dioxo complexes with chiral Schiff base ligands: Synthesis, characterization, and catalytic applications
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Molybdenum(VI) cis-dioxo complexes with chiral Schiff base ligands: Synthesis, characterization, and catalytic applications

机译:带有手性席夫碱配体的钼(VI)顺式-二氧杂配合物:合成,表征和催化应用

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摘要

Three optically active Molybdenum (VI) dioxo complexes with tetrahydro salen and substituted tetrahydro salen derivatives as ligands were synthesized and examined as catalysts for asymmetric epoxidation. Complexes of the type MoO2(L)(Solv) and WO2(L) (L tridentate, trans-2-aminocyclohexanol derived chiral Schiff base, Solv = alcohol) were prepared and characterized by elemental analysis, NMR and IR spectroscopy. These complexes are applicable as catalysts for olefin epoxidation reactions with tert-butyl hydroperoxide (TBHP) being the oxidizing agent. In case of cis-beta-methylstyrene moderate enantiomeric excesses of up to 26% can be reached when the reaction is carried out at 0degreesC.
机译:合成了具有四氢沙仑和取代的四氢沙仑衍生物作为配体的三种光学活性的钼(VI)二氧杂配合物,并将其用作不对称环氧化的催化剂。制备了类型为MoO2(L)(Solv)和WO2(L)的配合物(L三齿,反式-2-氨基环己醇衍生的手性席夫碱,Solv =醇),并通过元素分析,NMR和IR光谱进行了表征。这些配合物可用作烯烃环氧化反应的催化剂,其中叔丁基氢过氧化物(TBHP)为氧化剂。在顺式-β-甲基苯乙烯的情况下,当反应在0°C进行时,对映体过量可达26%。

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