Oxidative C–C Bond Cleavage of α‐Keto Acids by Cobalt(II) Complexes of Nitrogen Donor Ligands
作者:Biswarup Chakraborty、Partha Halder、Priya Ranjan Banerjee、Tapan Kanti Paine
DOI:10.1002/ejic.201200663
日期:2012.12
their versatile reactivity with dioxygen. The X-ray crystal structure of 2 suggests a five-coordinate cobalt(II) center coordinated by a monodentate benzoylformate and a tetradentate nitrogen-donor supporting ligand. Conversely, complex 3 is a dinuclear cobalt complex where two cobalt(II) centers are bridged by PP. While complex 1 is unreactive towards dioxygen, 2 reacts slowly with oxygen to exhibit quantitative
四种钴(II)配合物,[(6Me3TPA)CoII(BF)](BPh4) (1), [(TPA)CoII(BF)](BPh4) (2), [(6Me3TPA)CoII}2(PP) ](BPh4)2 (3) 和 [(TPA)CoII(PPH)](BPh4) (4) [其中 6Me3TPA = 三(6-甲基-2-吡啶基甲基)胺,TPA = 三(2-吡啶基甲基)胺, BF = 单阴离子苯甲酰甲酸酯, PP = 双阴离子苯基丙酮酸酯, 和 PPH = 单阴离子苯基丙酮酸酯], α-酮酸衍生物已被分离以显示它们与分子氧的多功能反应性。2 的 X 射线晶体结构表明五配位钴 (II) 中心由单齿苯甲酰甲酸酯和四齿氮供体支持配体配位。相反,配合物 3 是双核钴配合物,其中两个钴 (II) 中心由 PP 桥接。虽然复合物 1 对双氧无反应,2 与氧气缓慢反应以显示配位苯甲酰甲酸酯定量脱羧为苯甲酸酯。提出了