Abstract
Alkyl and aryl carbamates are synthesized in high yields (≥80%) at mild reaction conditions by reaction of the corresponding amine, CO2 and alkyl halides over either titanosilicate molecular sieves or metal phthalocyanine complexes encapsulated in zeolite-Y. The catalysts could be reused with little or no loss in activity. In contrast to hitherto known catalysts for carbamate synthesis, the zeolite-based catalysts of the present study do not require additional onium salts as co-catalysts.
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Srivastava, R., Manju, M., Srinivas, D. et al. Phosgene-Free Synthesis of Carbamates over Zeolite-Based Catalysts. Catalysis Letters 97, 41–47 (2004). https://doi.org/10.1023/B:CATL.0000034285.05419.7e
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DOI: https://doi.org/10.1023/B:CATL.0000034285.05419.7e