85023-49-0Relevant articles and documents
Mn(iii)-porphyrin catalysts for the cycloaddition of CO2with epoxides at atmospheric pressure: effects of Lewis acidity and ligand structure
Cabral, Bruno Noschang,Milani, Jorge Luiz S?nego,Meireles, Alexandre Moreira,Martins, Dayse Carvalho da Silva,Ribeiro, Stephany Larissa da Silva,Rebou?as, Júlio Santos,Donnici, Claudio Luis,das Chagas, Rafael Pav?o
, p. 1934 - 1943 (2021)
A series of eight Mn(iii)-porphyrin (MnP) complexes with electron-withdrawing substituents at themesoand/or β-pyrrole positions of the macrocycle was designed to uncover electronic and structural aspects of MnP catalytic activity in the cycloaddition of C
Chemical fixation of carbon dioxide to cyclic carbonates catalyzed by zinc(II) complex bearing 1,2-disubstituted benzimidazole ligand
Milani, Jorge L.S.,Oliveira, Igor S.,Santos, Pamella A. Dos,Valdo, Ana K.S.M.,Martins, Felipe T.,Cangussu, Danielle,Chagas, Rafael P. Das
, p. 245 - 249 (2018)
A new zinc(II) complex of formula [ZnCl2(L1)2] (1) [L1 = 2-(2-thienyl)-1-(2-thienylmethyl)-1H- benzimidazole] was synthesized and fully characterized by nuclear magnetic resonance and infrared spectroscopy, elemental analysis, electrospray ionization high-resolution mass spectrometry, and thermogravimetric analysis. The molecular structure was confirmed by single-crystal X-ray diffraction. Complex 1 consists of mononuclear tetrahedral zinc(II) units with a locked geometry resulting from weak intramolecular S…π and π–π interligand interactions. The benzimidazole ligand and its zinc(II) complex were readily obtained through a simple synthetic route. The catalytic activity of 1 was investigated in the coupling of carbon dioxide with epoxides to produce cyclic carbonates, and a series of parameters were evaluated. The complex efficiently catalyzed the transformation of various epoxides under solvent-free conditions, with good conversions, turnover numbers, and turnover frequencies.
Rosin-based porous heterogeneous catalyst functionalized with hydroxyl groups and triazole groups for CO2 chemical conversion under atmospheric pressure condition
Gao, Jinbin,Lai, Shilin,Xiong, Xingquan
, (2021/07/14)
Development of efficient, green and recyclable heterogeneous catalysts for the chemical conversion of CO2 into cyclic carbonates with excellent yields under atmospheric pressure condition is still a very challenging task. Herein, a class of biomass-derived hyper-cross-linked porous heterogeneous catalysts MPAc-Br and MPAc-OH-Br, based on easily available and sustainable rosin, was synthesized by Friedel–Crafts polymerization and the further N-alkylation of triazole groups. Compared with MPAc-Br, the bifunctional catalyst MPAc-OH-Br (bearing triazole IL groups and -OH groups) exhibited higher catalytic activity for direct chemical conversion of CO2 into cyclic carbonates (up to 99% yields) under metal-, solvent-free and atmospheric pressure conditions. The rosin-based porous molecular structure and bifunctional groups on the surface of MPAc-OH-Br played a very important role in the promoting the cycloaddition of CO2 with epoxides under the optimal conditions. Furthermore, MPAc-OH-Br exhibited good stability and reusability (96% yield after 10 recycles).
Highly selective visible-light-triggered CO2fixation to cyclic carbonates under mild conditions using TiO2/multiwall carbon nanotubes (MWCNT) grafted with Pt or Pd nanoparticles
El Nazer, Hossam A.,Elgohary, Elzahraa Ahmed,Fekry, Amany Mohamed,Mohamed, Yasser Mahmoud A.,Rabie, Samira Taha,Salih, Said Abdelrahman
, p. 17301 - 17312 (2021/10/04)
Irradiation of a series of aromatic epoxides and CO2in the presence of TiO2, TiO2/MWCNT, Pt//TiO2/MWCNT and Pd/TiO2/MWCNT photocatalysts was investigated with visible light-induced cycloaddition react
