Yu, Zhaozhuo; Li, Zhengyi; Zhang, Lilong; Zhu, Kaixun; Wu, Hongguo; Li, Hu; Yang, Song published the artcile< A substituent- and temperature-controllable NHC-derived zwitterionic catalyst enables CO2 upgrading for high-efficiency construction of formamides and benzimidazoles>, Related Products of 10541-78-3, the main research area is carbon dioxide formamide benzimidazole zwitterionic catalyst.
Chemocatalytic upgrading of the greenhouse gas CO2 to valuable chems. and biofuels has attracted broad attention in recent years. Among the reported approaches, N-formylation of CO2 with an amine is of great significance due to its versatility in the construction of N-containing linear and cyclic skeletons. Herein, a stable N-heterocyclic carbene-carboxyl adduct (NHC-CO2) was facilely prepared and could be used as a recyclable zwitterionic catalyst for efficient CO2 reductive upgrading via either N-formylation or further coupling with cyclization under mild conditions (25°C, 1 atm CO2) using hydrosilane as a hydrogen source. More than 30 different alkyl and aromatic amines could be transformed into the corresponding formamides or benzimidazoles with remarkable yields (74%-98%). The electronic effect of the introduced substituent on NHC-CO2 was found to evidently affect the thermostability and nucleophilicity of the zwitterionic catalyst, which is directly correlated with its catalytic activity. Moreover, NHC-CO2 could supply CO2 by in situ decarboxylation at a specific temperature that is dependent on the introduced substituent type. Exptl. and computational studies showed that the carboxyl species on NHC-CO2 was not only a nucleophilic center, but also a C1 source which rapidly captures or substitutes ambient CO2 during hydrosilylation. In addition, a simple and green conceptual process was designed for the product purification and catalyst recycling, with a good feasibility for small-scale production
Green Chemistry published new progress about Cyclization. 10541-78-3 belongs to class ethers-buliding-blocks, and the molecular formula is C8H11NO, Related Products of 10541-78-3.
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem