New zinc/tetradentate N 4 ligand complexes: Efficient catalysts for solvent-free preparation of cyclic carbonates by CO 2 /epoxide coupling
作者:Iyad Karamé、Samira Zaher、Nadim Eid、Lorraine Christ
DOI:10.1016/j.mcat.2018.07.001
日期:2018.9
Tetra-nitrogenated Zn-Schiff-base complexes have been synthetized and studied by X-ray diffraction. The prepared Zn-N4-ligands complexes could not follow the 18-electron rule. This property has allowed the complexes to be efficient in the coordination and activation of the substrates. The zinc complex of N,N’-bis(2-p-tosylaminobenzylidene)-1,2-diaminecyclohexane, Zn(Cy-Ts) combined to tetra-butylammonium
通过X射线衍射合成和研究了四氮化的Zn-Schiff碱配合物。制备的Zn-N 4-配体配合物不能遵循18电子规则。该性质使得配合物在底物的配位和活化中是有效的。N,N'-双(2-对甲苯磺酰基氨基亚苄基)-1,2-二胺环己烷的锌络合物Zn(Cy-Ts)与碘化四丁铵(TBAI)或与三乙胺的锌络合物,有效地催化了CO 2 /环氧化物的偶联。这些催化反应在没有溶剂的情况下在CO 2压力下于120°C进行。有选择地以高达99%的高收率(TON高达4900)获得环状碳酸酯。CO 2的两个可能途径提出了在没有卤化物干预的情况下β-环氧化物的偶联机理,其中两种反应物都被相同的锌金属中心活化。