Hexyl, cyclohexyl, 2-butyl or n-butyl amine was made to react with dimethyl carbonate in a 6-mL stainless steel reactor in (i) supercrit. CO2 (90), (H) N-2 (90) or (iii) air (1 atm) at 80 degrees C to yield Me N-hexyl, Me N-cyclohexyl, Me N-2-butyl, or Me N-butyl carbamate in (i) poor (10.7, 2, 1.8, 15), (ii) fairly high (59, 9, 3.2, 3.2, 60), and (iii) high (72, 32, 7.9, 60%) yields, resp. The reported catalytic effect of supercrit. CO2 was not confirmed; CO2 had even an inhibitive effect. The carbamate yields, as also selectivities, were best at 1 atm, thus indicating a promising (phosgene-less) route to carbamates and a new way to prep. polycarbonates.