Streng, E. S., Lee, D. S., George, M. W., & Poliakoff, M. (2017). Continuous N-alkylation reactions of amino alcohols using ?-Al2O3 and supercritical CO2: unexpected formation of cyclic ureas and urethanes by reaction with CO2. Beilstein Journal of Organic Chemistry, 13, https://doi.org/10.3762/bjoc.13.36