VERFAHREN ZUR HERSTELLUNG VON N,N'-DIALKYLSUBSTITUIERTEN CYCLISCHEN HARNSTOFFDERIVATEN.

摘要

The prepn. of 1,3-dialkyl-2-imidazolidinone derivs. of formula (I) comprises reacting a diamine of formula (II) with carbon dioxide in the gas phase in the presence of oxides of elements of the 3rd or 4th main group or 2nd-6th subsidiary group of the periodic table, or mixts. of these or in the presence of aluminium or magnesium silicates. In the formulae, R1 and R2 = 1-8C alkyl; R3-R6 = H or 1-17C alkyl. 1, 3, 4-trimethyl-2-imidazolidinone (Ia) is new.