In the present letter, an efficient, clean and one-pot synthesis of 2-substituted benzimidazole and 1,2-disubstituted benzimidazole derivatives has been explored by reacting o-phenylenediamine with aromatic aldehydes ...In the present letter, an efficient, clean and one-pot synthesis of 2-substituted benzimidazole and 1,2-disubstituted benzimidazole derivatives has been explored by reacting o-phenylenediamine with aromatic aldehydes using bismuth nitrate as a catalyst in ethanol at ambient temperature. This methodology avails with faster reactions, excellent yield, mild reaction conditions, use of inexpensive and non-toxic catalyst compared to literature reported hitherto.展开更多
The key issues to improve the performance of photocatalysts for selective oxidation of toluene are promoting the migration and separation of charge carrier,and enhancing the generation of active oxygen species.It is k...The key issues to improve the performance of photocatalysts for selective oxidation of toluene are promoting the migration and separation of charge carrier,and enhancing the generation of active oxygen species.It is known that the construction of compact heterojunction is an efficient protocol to inhibit photogenerated electron-hole recombination.In this work,a 2D-2D[Bi_(6)O_(6)(OH)_(3)](NO_(3))3·1.5H2O-Bi_(2)MoO_(6)(denoted as BBN-BMO)composite heterojunction has been prepared by one-step hydrothermal method for the first time.The tetragonal phase BBN in the composite plays the role of transferring electrons from the visible light activated orthorhombic phase BMO and promoting the generation of active·O_(2)^(-),the holes left in BMO are used to activate toluene and produce benzyl radical,thus greatly improving the photocatalytic performance for selective oxidation of toluene.The toluene conversion rate of BBN-BMO is 3466μmol·g^(-1)·h^(-1),which is three times that of pure BMO.The selectivity to benzalde-hyde is 94.2%.In addition,reasonable mechanism has been speculated based on a series of control experiments.展开更多
Bismuth（Ⅲ） nitrate pentahydrate catalyzed the three-component condensation ofβ-naphthol,aldehydes and amines/urea under solvent-free conditions to afford the corresponding amidoalkyl naphthols in excellent yields.
基金UGC,New Delhi,India for financial assistance under UGC-Major Research Project[No.41-302/2012(SR)]SAIF,Panjab University,Chandigarh for NMR analysis
文摘In the present letter, an efficient, clean and one-pot synthesis of 2-substituted benzimidazole and 1,2-disubstituted benzimidazole derivatives has been explored by reacting o-phenylenediamine with aromatic aldehydes using bismuth nitrate as a catalyst in ethanol at ambient temperature. This methodology avails with faster reactions, excellent yield, mild reaction conditions, use of inexpensive and non-toxic catalyst compared to literature reported hitherto.
基金National Natural Science Foundation of China(Nos.21975069,21725602,22108067,and 21938002)Innovative Research Groups of Hunan Province(No.2019JJ10001)Science and Technology Planning Project of Hunan Province(No.2019RS3010).
文摘The key issues to improve the performance of photocatalysts for selective oxidation of toluene are promoting the migration and separation of charge carrier,and enhancing the generation of active oxygen species.It is known that the construction of compact heterojunction is an efficient protocol to inhibit photogenerated electron-hole recombination.In this work,a 2D-2D[Bi_(6)O_(6)(OH)_(3)](NO_(3))3·1.5H2O-Bi_(2)MoO_(6)(denoted as BBN-BMO)composite heterojunction has been prepared by one-step hydrothermal method for the first time.The tetragonal phase BBN in the composite plays the role of transferring electrons from the visible light activated orthorhombic phase BMO and promoting the generation of active·O_(2)^(-),the holes left in BMO are used to activate toluene and produce benzyl radical,thus greatly improving the photocatalytic performance for selective oxidation of toluene.The toluene conversion rate of BBN-BMO is 3466μmol·g^(-1)·h^(-1),which is three times that of pure BMO.The selectivity to benzalde-hyde is 94.2%.In addition,reasonable mechanism has been speculated based on a series of control experiments.
文摘Bismuth（Ⅲ） nitrate pentahydrate catalyzed the three-component condensation ofβ-naphthol,aldehydes and amines/urea under solvent-free conditions to afford the corresponding amidoalkyl naphthols in excellent yields.
