Photocatalytic function of the B<sub>12</sub> complex with the cyclometalated iridium(<scp>iii</scp>) complex as a photosensitizer under visible light irradiation
phenyl group of 2-bromomethyl-2-phenylmalonate. The plausible reaction mechanism was proposed, which involved two quenching pathways, an oxidative quenching pathway and a reductive quenching pathway, to be responsible for the initial electron transfer of the excited-state photosensitizers during the DDT dechlorination reaction. Transient photoluminescence experiments revealed that the oxidative quenching
The vitamin B12–TiO2 hybrid catalyst was effectively immobilized on a glass plate, and the immobilizedcatalyst shows an efficient reactivity for various molecular transformations, such as the 1,2-...
The B12âTiO2 hybrid catalyst was effectively used for the radical reactions, such as 1,2-migrations of phenyl groups and acyl groups under irradiation by UV light, and the selectivity of the reaction was controlled by the solvent system.
Reprint of: Impact of the corrin framework of vitamin B12 on the electrochemical carbon-skeleton rearrangement in comparison to an imine/oxime planar ligand; tuning selectivity in 1,2-migration of a functional group by controlling electrolysis potential
study. The electrolysis of the substrate at − 1.0 V vs. Ag-AgCl by light irradiation afforded the simple reduced product (diethyl 2-methyl-2-phenylmalonate) and the phenyl migrated product (diethyl 2-benzyl-2-phenylmalonate), as well as the electrolysis of the substrate at − 1.5 V vs. Ag-AgCl in the dark. The electrolysis of the substrate at − 2.0 V vs. Ag-AgCl afforded the carboxylic ester migrated product
在辅酶B 12依赖性酶中,甲基丙二酰-CoA突变酶(MMCM)催化R-甲基丙二酰-CoA和琥珀酰-CoA之间的碳骨架重排反应。将2-溴甲基-2-苯基丙二酸二乙酯(一种在β碳上具有两个不同迁移基团(苯基和羧酸酯基)的烷基溴化物底物)用于由疏水性维生素B 12模型配合物(高氯酸七甲酯)形成的电解溶液。这项研究。基板在-1.0 V vs.Ag-AgCl通过光照射得到简单的还原产物(2-甲基-2-苯基丙二酸二乙酯)和苯基迁移产物(2-苄基-2-苯基丙二酸二乙酯),以及在-1.5 V vs. 。银-氯化银在黑暗中。相对于Ag-AgCl,在-2.0 V下对底物进行电解,得到羧酸酯迁移产物(苯基琥珀酸二乙酯)作为主要产物。通过控制电解电位成功地调节了迁移基团的选择性。我们通过机械研究和与简单维生素B 12的比较,阐明了Co(III)烷基化的七甲基七丁香酸酯的阴极化学对于迁移基团的选择性至关重要。 模型复合物,一种亚胺/肟型钴复合物。
Electrochemical Catalytic Carbon-skeleton Rearrangement Mediated by Imine/Oxime-type B<sub>12</sub>Model Complex
An electrochemical carbon-skeleton rearrangement of methylmalonate skeleton to succinate was successfully mediated by an imine/oxime-type cobalt complex using diethyl 2-bromomethyl-2-phenylmalonate as a model substrate of a coenzyme B12-dependent enzymatic reaction. Cyclic voltammetric and mass spectrometric studies revealed that this electrocatalysis of the alkyl bromide with 1,2-migration of a carboxylic ester group was achieved by the duet redox process between the reduction of the monoalkylated complex and the oxidation of the dialkylated complex.