Aliphatic and aromatic alcohols are efficiently oxidized to ketones or carboxylic acids using aqueous hydrogen peroxide as an oxidant in the presence of a Mn(Ⅲ) Schiff-base complex as a catalyst under solvent-free co...Aliphatic and aromatic alcohols are efficiently oxidized to ketones or carboxylic acids using aqueous hydrogen peroxide as an oxidant in the presence of a Mn(Ⅲ) Schiff-base complex as a catalyst under solvent-free conditions.The oxidation of alcohols occurred at 50℃ to give the corresponding ketones or carboxylic acids with a yield higher than 60%.展开更多
Manganese oxides are a promising class of electrocatalysts for renewable energy devices,such as fuel cells.Mn(Ⅲ) ions with e_(g) electron filling of-1 are the active sites for manganese-based electrocatalysts.However...Manganese oxides are a promising class of electrocatalysts for renewable energy devices,such as fuel cells.Mn(Ⅲ) ions with e_(g) electron filling of-1 are the active sites for manganese-based electrocatalysts.However,Mn(Ⅲ) sites may be disproportionated during electrochemical reactions,thus reducing the number of Mn(Ⅲ) active sites and decreasing the catalytic activity of manganese oxides.In this work,we developed a facile cyclic voltammetry method to monitor the evolution of Mn(Ⅲ) sites on a series of manganese oxides under "working" conditions.We proposed a descriptor S_(Mn(Ⅲ)) to describe the stability of Mn(Ⅲ).Our simulated and experimental results show that the higher is S_(Mn(Ⅲ)),the higher the active Mn(Ⅲ)density,and the higher the electrocatalytic activity of the manganese oxide electrocatalyst.展开更多
Secondary alcohols were catalytically oxidized with diacetoxyiodobenzene as oxidant in the presence of salen- Mn(III) complex to afford the corresponding ketones, in up to 99% yield, using CH 2Cl 2 or water as reac...Secondary alcohols were catalytically oxidized with diacetoxyiodobenzene as oxidant in the presence of salen- Mn(III) complex to afford the corresponding ketones, in up to 99% yield, using CH 2Cl 2 or water as reaction media.展开更多
基金Supported by the Islamic Azad University-Ghaemshahr branch of the Islamic Republic of Iran
文摘Aliphatic and aromatic alcohols are efficiently oxidized to ketones or carboxylic acids using aqueous hydrogen peroxide as an oxidant in the presence of a Mn(Ⅲ) Schiff-base complex as a catalyst under solvent-free conditions.The oxidation of alcohols occurred at 50℃ to give the corresponding ketones or carboxylic acids with a yield higher than 60%.
基金supported by the National Natu-ral Science Foundation of China(Nos.52071231,51722103)the Natural Science Foundation of Tianjin(19JCJQJC61900).
文摘Manganese oxides are a promising class of electrocatalysts for renewable energy devices,such as fuel cells.Mn(Ⅲ) ions with e_(g) electron filling of-1 are the active sites for manganese-based electrocatalysts.However,Mn(Ⅲ) sites may be disproportionated during electrochemical reactions,thus reducing the number of Mn(Ⅲ) active sites and decreasing the catalytic activity of manganese oxides.In this work,we developed a facile cyclic voltammetry method to monitor the evolution of Mn(Ⅲ) sites on a series of manganese oxides under "working" conditions.We proposed a descriptor S_(Mn(Ⅲ)) to describe the stability of Mn(Ⅲ).Our simulated and experimental results show that the higher is S_(Mn(Ⅲ)),the higher the active Mn(Ⅲ)density,and the higher the electrocatalytic activity of the manganese oxide electrocatalyst.
基金theNationalNaturalScienceFoundationofChina (No .2 99330 5 0 )
文摘Secondary alcohols were catalytically oxidized with diacetoxyiodobenzene as oxidant in the presence of salen- Mn(III) complex to afford the corresponding ketones, in up to 99% yield, using CH 2Cl 2 or water as reaction media.
