N'-ethyl-N'-methylpropane-1,3-diamine

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 43.6 g (0.2 mol+10% excess) of maleic acid-monocyclohexyl ester, 40 ml of triethylamine and 23.2 g (0.2 mol) of 3-(methylethylamino)-propylamine are reacted in the manner described in Example 1 and analogously further processed. The yield is 36.3 g (57.7% of theory) of a crystalline aspartic acid derivative which, after recrystallisation in acetone, melts at 123.5°-127.5° C. The yield is 36.3 g (57.7% of theory) of a crystalline aspartic acid derivative which, after recrystallisation in acetone

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 43.6 g (0.2 mol+10% excess) of maleic acid-monocyclohexyl ester, 40 ml of triethylamine and 23.2 g (0.2 mol) of 3-(methylethylamino)-propylamine are reacted in the manner described in Example 1 and analogously further processed. The yield is 36.3 g (57.7% of theory) of a crystalline aspartic acid derivative which, after recrystallisation in acetone, melts at 123.5°-127.5° C. The yield is 36.3 g (57.7% of theory) of a crystalline aspartic acid derivative which, after recrystallisation in acetone