Well‐Defined Cesium Benzotriazolide as an Active Catalyst for Generating Disubstituted Ureas from Carbon Dioxide and Amines. Issue 2 (28th December 2016)

• Record Type: Journal Article
• Authors: Truong, Cong Chien; Kim, Jin; Lee, Yunho; Kim, Yong Jin
• Is Part Of: ChemCatChem. Volume 9:Issue 2(2017)
• Page Start: 247
• Page End: 252
• Publication Date: 2016-12-28
• Subjects: amines -- carboxylation -- homogeneous catalysis -- cesium benzotriazolide -- carbon dioxide fixation; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201601320
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: The reaction of alkali metal carbonates with various azole compounds produced a new series of alkali metal azolides, and they were applied as active catalysts for the production of disubstituted ureas from the carboxylation of various amines with CO2 . Among them, cesium benzotriazolide (Cs[BTd]) was found to be the most active for the carboxylation reaction and was structurally characterized by single‐crystal X‐ray diffraction. The crystal structure of highly hygroscopic Cs[BTd] was found to be [BTA]⋅⋅⋅ Cs[BTd], which explains why it is a water‐tolerant active species for this carboxylation reaction, leading to a maximum turnover frequency of 344 h −1 as well as high recyclability even after five successive runs. Abstract : A good fix : Alkali metal azolides are prepared and used as catalysts for the production of disubstituted ureas from the carboxylation of various amines with CO2 . Among them, cesium benzotriazolide (Cs[BTd]) is found to be the most active for the carboxylation reaction with a maximum turnover frequency of 344 h −1 The Cs[BTd] is structurally characterized by single‐crystal X‐ray diffraction and shows high activity even after recycling over five successive runs.