Carbamoylation of primary, secondary and aromatic amines by dimethyl carbonate in a flow system over solid catalysts

Sustainable Chemical Processes

Table 2 Carbamoylation of primary aliphatic amines RNH ₂ with DMC

Amine	*Yield of carbamate [%]**	Conversion of amine [%]	Selectivity towards carbamate [%]
n-Hexyl	52.4	67.2	78.0
n-Butyl	32.6	51.1	63.8
Cyclohexyl	1.3	5.2	25.0
Sec-Butyl	1.4	10.3	13.5
Benzyl	13.6	25.6	53.1

*GC-yield versus amine.
Molar ratio of amine: DMC = 2:1, WHSV = 4 g amine/1 g catalyst · h, reactant mixture pressure = 9.0 MPa, reaction temperature = 150ºC. The number of replicates was 3.