Heterogeneous CeO2catalyst for the one-pot synthesis of organic carbamates from amines, CO2 and alcohols

Abstract

Heterogeneous CeO₂ catalyst can catalyze the one-pot synthesis of methyl benzylcarbamate from benzylamine, CO₂ and methanol. The yield of methyl benzylcarbamate reached 92% at >99% benzylamine conversion and 92% benzylamine-based selectivity even in the absence of the dehydrating agents. The catalyst is reusable after the calcination at 873 K for 3 h. Various carbamates can be synthesized with good yield and high selectivity by the reaction of amines + CO₂ + alcohols over CeO₂. The main formation route of methyl benzylcarbamate is suggested to be the reaction of dimethyl carbonate or the precursor of dimethyl carbonate formation with benzylamine.