Calcium carbide as a dehydrating agent for the synthesis of carbamates, glycerol carbonate, and cyclic carbonates from carbon dioxide. Issue 13 (10th June 2020)

• Record Type: Journal Article
• Authors: Zhang, Qiao; Yuan, Hao-Yu; Lin, Xiao-Tao; Fukaya, Norihisa; Fujitani, Tadahiro; Sato, Kazuhiko; Choi, Jun-Chul
• Is Part Of: Green chemistry. Volume 22:Issue 13(2020)
• Page Start: 4231
• Page End: 4239
• Publication Date: 2020-06-10
• Subjects: Environmental chemistry -- Industrial applications -- Periodicals; Environmental management -- Periodicals; 660
• DOI: 10.1039/d0gc01402h
• Languages: English
• ISSNs: 1463-9262

Abstract

Abstract : Calcium carbide was used as a sustainable dehydrating agent for the synthesis of carbamates, glycerol carbonate, and cyclic carbonates directly from CO2 . Abstract : Carbon dioxide (CO2 ) is a nontoxic and inexpensive C1 building block, which can be used for the synthesis of valuable chemicals such as aromatic carbamates from anilines and methanol (MeOH), glycerol carbonate from glycerol, and cyclic carbonates from diols. However, these reactions generate water as the byproduct and suffer from thermodynamic limits, which lead to low yields. Calcium carbide (CaC2 ) is a renewable chemical, which can be recycled from calcium that is abundant in the Earth's crust. Furthermore, CaC2 rapidly reacts with water. In this work, we used CaC2 as a dehydrating agent for the direct synthesis of carbamates (including polyurethane precursors) from amines, CO2, and MeOH. All reagents were commercially available. In addition, CaC2 was employed for the synthesis of glycerol carbonate from glycerol and CO2 with a zinc catalyst and N-donor ligand. A similar protocol was applied to synthesize cyclic carbonates from diols and CO2 .