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Open-chain hemiketal is stabilized by coordination to a copper (II)

机译:通过协调铜(II),开放式环状稳定(II)

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The hemiketal complex [Cu{NH2C(Me)(2)C(Ph)(OMe)O}(2)] (1) was generated by the reaction of [Cu(NCMe)(4)](BF4) and 4 equivs of 2,2-dimethyl-3-phenyl-2H-azirine in the presence of NCNMe2 in wet MeOH and isolated in 92% yield. In 1, the in situ formed hemiketal NH2C(Me)(2)C(Ph)(OMe)OH in its deprotonated form is stabilized due to chelation to copper(II). In the X-ray structure of 1.4MeOH, the intermolecular hydrogen bonding was detected between O and N atoms of the organic ligand and the H-O group of solvated MeOH as well as between two molecules of the solvated MeOH. Three types of hydrogen bonds in the obtained structure were studied by the DFT calculations (MO6/6-31 ++G** level of theory, MDF10 pseudopotentials on the Cu atoms) and topological analysis of the electron density distribution within the formalism of Bader's theory (QTAIM method). Estimated strength of these non-covalent interactions is 3-9 kcal/mol. (C) 2017 Elsevier B.V. All rights reserved.
机译:通过[Cu(NCME)(4)](BF4)和4当量的反应产生环状复合物[Cu {NH 2 C(ME)(2)C(PH)(OME)O}(2)](1) 在湿MeOH的NCNME2存在下2,2-二甲基-3-苯基-2H-二氮杂物,分离92%的产率。 在1中,原位形成的长臂NH2C(ME)(2)C(2)C(pH)(OME)OH以其质子化形式稳定,因为铜(II)螯合。 在1.4MeOH的X射线结构中,在有机配体的O和N原子和溶剂化MeOH的H-O基团之间以及溶剂化MeOH的两个分子之间检测分子间氢键。 通过DFT计算研究了所得结构中的三种类型的氢键(MO6 / 6-31 ++ G **理论水平,Cu原子上的MDF10假势)和獾内的电子密度分布的拓扑分析 理论(Qtaim方法)。 这些非共价相互作用的估计强度为3-9千卡/摩尔。 (c)2017 Elsevier B.v.保留所有权利。

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