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A Simple Zinc Catalyst for Carbamate Synthesis Directly from CO2.
- Source :
- ChemSusChem; 4/10/2017, Vol. 10 Issue 7, p1501-1508, 8p
- Publication Year :
- 2017
-
Abstract
- Several zinc salts were employed as catalysts for the synthesis of carbamates directly from aromatic amines, CO<subscript>2</subscript>, and silicate esters. Zn(OAc)<subscript>2</subscript> offered the best performance among the salts tested. The addition of an N-donor ligand such as 1,10-phenanthroline increased the yield. The best catalytic performance of Zn(OAc)<subscript>2</subscript> can be explained by carboxylate-assisted proton activation. The interaction between the substrate and the catalyst can be observed by chemical shifts in <superscript>1</superscript>H and <superscript>15</superscript>N NMR spectra. Isocyanate was a key intermediate, which was generated from amine and CO<subscript>2</subscript>. Silicate ester was finally converted to siloxane, which was determined by <superscript>29</superscript>Si NMR. The commercially available catalyst system could be reused. The yield of isolated carbamate could reach up to 96 % with various substrates, and the catalytic reaction was amine-selective in the presence of other functional groups. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18645631
- Volume :
- 10
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- ChemSusChem
- Publication Type :
- Academic Journal
- Accession number :
- 122404048
- Full Text :
- https://doi.org/10.1002/cssc.201601878