New Copper(II) Complexes as Efficient Catalysts for Olefin Aziridination: The Effect of Ligand Steric Hindrance on Reactivity
作者:Thirumanasekaran Dhanalakshmi、Eringathodi Suresh、Helen Stoeckli‐Evans、Mallayan Palaniandavar
DOI:10.1002/ejic.200600490
日期:2006.11
The complexes undergo quasi-reversible CuII/CuI redox behavior in methanol solution. The ability of the complexes to mediate nitrene transfer from PhINTs to olefins to form N-tosylaziridines has been studied. The complexes are found to be efficient catalysts (in 5 mol-% amounts) for the aziridination of the reactive olefin styrene, with yields varying from 80 to 90 % (with respect to PhINTs). They exhibit
源自三齿 N3 配体 4-methyl-1-(pyrid-2-ylmethyl)-1,4-diazacycloheptane (L1), 1-(quinol-2-ylmethyl)-1,4- 的三种新的铜 (II) 配合物二氮杂环庚烷 (L2) 和 4-甲基-1-(醌醇-2-基甲基)-1,4-二氮杂环庚烷 (L3) 已被制备和研究作为烯烃氮丙啶化的铜催化剂。在复合物 [Cu(L2)Cl2] (2) 和 [Cu(L3)Cl2] (3) 铜 (II) 的 X 射线晶体结构中,采用三角-双锥体畸变方形锥体几何结构 (TBDSBP) 作为从三角指数 τ 的值可以看出(2 为 0.08,3 为 0.48)。3 中增强的三角畸变是由于 N-Me 基团的存在,其孤对轨道不完全沿着铜 (II) 的 d 轨道定向。虽然 [Cu(L1)(H2O)](ClO4)2 (1) 在溶液中呈现四方几何形状,UV/Vis