Mechanistic Studies of the O<sub>2</sub>-Dependent Aliphatic Carbon−Carbon Bond Cleavage Reaction of a Nickel Enolate Complex
作者:Lisa M. Berreau、Tomasz Borowski、Katarzyna Grubel、Caleb J. Allpress、Jeffrey P. Wikstrom、Meaghan E. Germain、Elena V. Rybak-Akimova、David L. Tierney
DOI:10.1021/ic1017888
日期:2011.2.7
Overall, I is a reasonable structural model for the ES adduct formed in the active site of NiIIARD. However, the presence of phenyl appendages at both C(1) and C(3) in the [PhC(O)C(OH)C(O)Ph]− anion results in a reaction pathway for O2-dependent aliphatic carbon−carbon bond cleavage (via a trione intermediate) that differs from that accessible to C(1)−H acireductone species. This study, as the first detailed
单核镍(II)烯醇盐配合物[(6-Ph 2 TPA)Ni(PhC(O)C(OH)C(O)Ph] ClO 4(I)是酶/底物(ES的第一个反应模型配合物)待报道的含镍(II)的乙二醛酮双加氧酶(ARDs)中的加合物,进一步研究了其依赖于O 2的脂肪族碳-碳键裂解反应的机理,停止流动力学研究表明该反应的我被O 2是整体二阶和更慢〜80倍,在比涉及烯醇化物盐[Me中反应25℃ 4 N] [光子晶体(O)C(OH)C(O)PH]。计算研究阴离子[PhC(O)C(OH)C(O)Ph] -与O的反应2支持氢过氧化物机构,其中所述第一步骤是氧化还原过程的结果在1,3- diphenylpropanetrione和HOO的形成- 。独立的实验表明,1,3- diphenylpropanetrione和HOO之间的反应-导致氧化脂族碳-碳键裂解和苯甲酸,苯甲酸的形成,和CO:CO 2(〜12:1)。在存在镍