The Experts below are selected from a list of 243 Experts worldwide ranked by ideXlab platform
Haoran Li - One of the best experts on this subject based on the ideXlab platform.
-
Acetylacetone–metal catalyst modified by pyridinium salt group applied to the NHPI-catalyzed oxidation of cholesteryl acetate
Catalysis Science & Technology, 2011Co-Authors: Pengfei Zhang, Zhirong Chen, Congmin Wang, Haoran LiAbstract:Acetylacetone–metal catalysts modified by ionic compounds were used as co-catalysts in the NHPI-catalyzed oxidation of cholesteryl acetate by molecular oxygen under mild conditions. When cholesteryl acetate was oxidized at 30 °C for 10 h, a 79% isolated yield for 7-ketocholesteryl acetate was achieved. The dual role of pyridinium salt group onto the Acetylacetone ligand, serving as an electron-withdrawing group and at the same time as a co-catalyst for the decomposition of alkyl hydroperoxide, was responsible for the high isolated yield.
-
Acetylacetone metal catalyst modified by pyridinium salt group applied to the nhpi catalyzed oxidation of cholesteryl acetate
Catalysis Science & Technology, 2011Co-Authors: Pengfei Zhang, Zhirong Chen, Congmin Wang, Haoran LiAbstract:Acetylacetone–metal catalysts modified by ionic compounds were used as co-catalysts in the NHPI-catalyzed oxidation of cholesteryl acetate by molecular oxygen under mild conditions. When cholesteryl acetate was oxidized at 30 °C for 10 h, a 79% isolated yield for 7-ketocholesteryl acetate was achieved. The dual role of pyridinium salt group onto the Acetylacetone ligand, serving as an electron-withdrawing group and at the same time as a co-catalyst for the decomposition of alkyl hydroperoxide, was responsible for the high isolated yield.
-
Acetylacetone fe catalyst modified by imidazole ionic compound and its application in aerobic oxidation of β isophorone
Catalysis Communications, 2009Co-Authors: Xingbang Hu, Hang Chen, Haoran LiAbstract:Abstract Traditional Acetylacetone–Fe catalyst modified by imidazole ionic compound was synthesized and used in the oxidation of β-isophorone. Compared with the traditional Acetylacetone–Fe, it was found that the modified Acetylacetone–Fe catalyst was reusable, more effective and stable, which provides a new way for making more powerful and greener Acetylacetone metal catalyst for chemical industry.
-
Acetylacetone–Fe catalyst modified by imidazole ionic compound and its application in aerobic oxidation of β-isophorone
Catalysis Communications, 2009Co-Authors: Xingbang Hu, Hang Chen, Haoran LiAbstract:Abstract Traditional Acetylacetone–Fe catalyst modified by imidazole ionic compound was synthesized and used in the oxidation of β-isophorone. Compared with the traditional Acetylacetone–Fe, it was found that the modified Acetylacetone–Fe catalyst was reusable, more effective and stable, which provides a new way for making more powerful and greener Acetylacetone metal catalyst for chemical industry.
Jie Xu - One of the best experts on this subject based on the ideXlab platform.
-
Switching acidity on manganese oxide catalyst with Acetylacetones for selectivity-tunable amines oxidation
Nature Communications, 2019Co-Authors: Xiuquan Jia, Fei Xia, Jiping Ma, Mingxia Gao, Jin Gao, Jie XuAbstract:The design of metal oxide catalysts predominantly focuses on the composition or geometry engineering to enable optimized reactivity on the surface. Despite the numerous reports investigating the surface chemisorption of organic molecules on metal oxides, insights into how adsorption of organic modifiers can be exploited to optimize the catalytic properties of metal oxides are lacking. Herein, we describe the use of enolic Acetylacetones to modify the surface Lewis acid properties of manganese oxide catalysts. The Acetylacetone modification is stable under the reaction conditions and strongly influences the redox-acid cooperative catalysis of manganese oxides. This enables a rational control of the oxidation selectivity of structurally diverse arylmethyl amines to become switchable from nitriles to imines.Exploiting the organic adsorbate-metal oxide interaction to optimize the catalytic properties of metal oxides has been rarely explored. Here, the authors use enolic Acetylacetones to modify the surface Lewis acid properties of manganese oxide, enabling a rational control of the oxidation selectivity of structurally diverse arylmethyl amines.
Xiuquan Jia - One of the best experts on this subject based on the ideXlab platform.
-
Switching acidity on manganese oxide catalyst with Acetylacetones for selectivity-tunable amines oxidation
Nature Communications, 2019Co-Authors: Xiuquan Jia, Fei Xia, Jiping Ma, Mingxia Gao, Jin Gao, Jie XuAbstract:The design of metal oxide catalysts predominantly focuses on the composition or geometry engineering to enable optimized reactivity on the surface. Despite the numerous reports investigating the surface chemisorption of organic molecules on metal oxides, insights into how adsorption of organic modifiers can be exploited to optimize the catalytic properties of metal oxides are lacking. Herein, we describe the use of enolic Acetylacetones to modify the surface Lewis acid properties of manganese oxide catalysts. The Acetylacetone modification is stable under the reaction conditions and strongly influences the redox-acid cooperative catalysis of manganese oxides. This enables a rational control of the oxidation selectivity of structurally diverse arylmethyl amines to become switchable from nitriles to imines.Exploiting the organic adsorbate-metal oxide interaction to optimize the catalytic properties of metal oxides has been rarely explored. Here, the authors use enolic Acetylacetones to modify the surface Lewis acid properties of manganese oxide, enabling a rational control of the oxidation selectivity of structurally diverse arylmethyl amines.
Mohammad Rafiee - One of the best experts on this subject based on the ideXlab platform.
-
diversity in electrochemical oxidation of dihydroxybenzoic acids in the presence of Acetylacetone a green method for synthesis of new benzofuran derivatives
Green Chemistry, 2005Co-Authors: Davood Nematollahi, Mohammad RafieeAbstract:Electrochemical oxidation of diol derivatives of benzoic acid (1–3) have been studied in the presence of Acetylacetone (4) as the nucleophile in aqueous solutions, using cyclic voltammetry and controlled-potential coulometry. The results indicate that the quinones derived from dihydroxybenzoic acids (1a–3a) participate in Michael addition reactions with Acetylacetone (4) and via various mechanisms convert to the corresponding benzofurans (1d–3d). In this work, we derive various products with good yields based on electrochemical oxidation under controlled potential conditions in aqueous solutions, without toxic reagents and solvents at a carbon electrode in an undivided cell, using an environmentally friendly method.
-
electrochemical oxidation of catechols in the presence of Acetylacetone
Journal of Electroanalytical Chemistry, 2004Co-Authors: Davood Nematollahi, Mohammad RafieeAbstract:Electrochemical oxidation of catechols (1a–1c) has been studied in the presence of Acetylacetone (3) as a nucleophile in aqueous solutions, using cyclic voltammetry and controlled-potential coulometry. The results indicate that the quinones derived from catechols (1a–1c) participate in Michael addition reactions with Acetylacetone (3) to form the corresponding benzofurans (6a–6c). In this work we have proposed a mechanism for the electrode process. The electrochemical synthesis of benzofurans 6a–6c has been successfully performed at carbon rod electrodes and in an undivided cell.
Fei Xia - One of the best experts on this subject based on the ideXlab platform.
-
Switching acidity on manganese oxide catalyst with Acetylacetones for selectivity-tunable amines oxidation
Nature Communications, 2019Co-Authors: Xiuquan Jia, Fei Xia, Jiping Ma, Mingxia Gao, Jin Gao, Jie XuAbstract:The design of metal oxide catalysts predominantly focuses on the composition or geometry engineering to enable optimized reactivity on the surface. Despite the numerous reports investigating the surface chemisorption of organic molecules on metal oxides, insights into how adsorption of organic modifiers can be exploited to optimize the catalytic properties of metal oxides are lacking. Herein, we describe the use of enolic Acetylacetones to modify the surface Lewis acid properties of manganese oxide catalysts. The Acetylacetone modification is stable under the reaction conditions and strongly influences the redox-acid cooperative catalysis of manganese oxides. This enables a rational control of the oxidation selectivity of structurally diverse arylmethyl amines to become switchable from nitriles to imines.Exploiting the organic adsorbate-metal oxide interaction to optimize the catalytic properties of metal oxides has been rarely explored. Here, the authors use enolic Acetylacetones to modify the surface Lewis acid properties of manganese oxide, enabling a rational control of the oxidation selectivity of structurally diverse arylmethyl amines.
