The latter is hydrolyzed with aqueous mineral acids, for example hydrochloric acid, to cyclopropylethylenediamine or, otherwise, it is alkylated with alkyl halides or sulphates in such solvents as DMF, DMSO, acetone, in the presence of metal alcoholates or alkali carbonates, to N-acetyl-N'-cyclopropyl-N'-alkylethylenediamines which are then saponified with aqueous mineral acids to give the corresp