An efficient and practical route to various 3-alkoxylquinoxalin-2(1 H)-ones through visible-light photocatalytic C(sp^2)-H/O-H cross-dehydrogenation coupling of quinoxalin-2(1 H)-ones and alcohols,employing ambient ai...An efficient and practical route to various 3-alkoxylquinoxalin-2(1 H)-ones through visible-light photocatalytic C(sp^2)-H/O-H cross-dehydrogenation coupling of quinoxalin-2(1 H)-ones and alcohols,employing ambient air as an oxidant at room temperature under metal-free conditions,was developed.展开更多
Constructing C-C bonds is central to the synthesis of all chemical products.While conventional C-C bond formation methods always require one or two functional groups,20 years ago,our establishment of the concept of Cr...Constructing C-C bonds is central to the synthesis of all chemical products.While conventional C-C bond formation methods always require one or two functional groups,20 years ago,our establishment of the concept of Cross-Dehydrogenative Coupling(CDC),wherein C-C bonds are directly formed from two different C-H bonds via the"formal"removal of two H atoms,has revolutionized chemical synthesis and has become one of the most active research subjects in chemistry.This perspective article will provide an insight of the origin of this concept and its early development in our laboratory.展开更多
Heterogeneous catalysts have been developed for C-C coupling reactions,but stand low activity and always proceed under harsh conditions.Photocatalytic Stille cross-coupling reaction as a green catalytic method for C-C...Heterogeneous catalysts have been developed for C-C coupling reactions,but stand low activity and always proceed under harsh conditions.Photocatalytic Stille cross-coupling reaction as a green catalytic method for C-C bond formation is of great interest for a wide range of scientists but still lacks stable and highly efficient catalysts.Herein,we have designed an Au nanoparticle-graphitic carbon nitride heterojunction as an outstanding photocatalyst for artificial photosynthesis in Stille cross-coupling reaction.The interface effect between metal and semi.conductor makes electron rectify and prevents the recombination of electron-hole pairs.Moreover,the efficiency of Au nanoparticle catalysts could be adjusted by gold contents.Thus the turnover frequency(TOF)value reached the highest level of 788 h l over the optimal heterojunction catalyst.Most importantly,the C-C bond formation reaction has been proved to be carried out well under visible light irradiation,indicating the low-cost organic synthesis pro cess.Further analysis confirmed the stability and general application of our heterogeneous Au nano-heterojunctior catalyst.展开更多
文摘An efficient and practical route to various 3-alkoxylquinoxalin-2(1 H)-ones through visible-light photocatalytic C(sp^2)-H/O-H cross-dehydrogenation coupling of quinoxalin-2(1 H)-ones and alcohols,employing ambient air as an oxidant at room temperature under metal-free conditions,was developed.
文摘Constructing C-C bonds is central to the synthesis of all chemical products.While conventional C-C bond formation methods always require one or two functional groups,20 years ago,our establishment of the concept of Cross-Dehydrogenative Coupling(CDC),wherein C-C bonds are directly formed from two different C-H bonds via the"formal"removal of two H atoms,has revolutionized chemical synthesis and has become one of the most active research subjects in chemistry.This perspective article will provide an insight of the origin of this concept and its early development in our laboratory.
基金supported by the National Natural Science Foundation of China(21004024)the Province Natural Science Foundation of Fujian,China(2011J01046)+2 种基金the Program for New Century Excellent Talents in University of Fujian Province(2012FJ-NCET-ZR03)the University Distinguished Young Research Talent Training Program of Fujian Province(11FJPY02)the Promotion Program for Young and Middle-aged Teacher in Scienceand Technology Research of Huaqiao University(ZQN-YX103)~~
基金Supported by the National Natural Science Foundation of China(Nos.21722103,21931005,21720102002,and 21673140)the Projiect of the Shanghai Science and Technology Committee,China(No.19JC1412600)the Fund of the SJTU-MPI Partner Group.
文摘Heterogeneous catalysts have been developed for C-C coupling reactions,but stand low activity and always proceed under harsh conditions.Photocatalytic Stille cross-coupling reaction as a green catalytic method for C-C bond formation is of great interest for a wide range of scientists but still lacks stable and highly efficient catalysts.Herein,we have designed an Au nanoparticle-graphitic carbon nitride heterojunction as an outstanding photocatalyst for artificial photosynthesis in Stille cross-coupling reaction.The interface effect between metal and semi.conductor makes electron rectify and prevents the recombination of electron-hole pairs.Moreover,the efficiency of Au nanoparticle catalysts could be adjusted by gold contents.Thus the turnover frequency(TOF)value reached the highest level of 788 h l over the optimal heterojunction catalyst.Most importantly,the C-C bond formation reaction has been proved to be carried out well under visible light irradiation,indicating the low-cost organic synthesis pro cess.Further analysis confirmed the stability and general application of our heterogeneous Au nano-heterojunctior catalyst.
