Abstract:
Prepn. of a diamine (I) involves reacting an aminoalcohol (II) with ammonia or a prim. or sec. amine and hydrogen at 1-400 bars and 80-250 degrees C in presence of a catalyst (A) contg. the following oxygen-contg. metal cpds. in amts. (by wt.) 20-85% Zr cpd. (calculated as ZrO2), 1-30% Cu cpd. (calculated as CuO), 30-70% Ni cpd. (calculated as NiO), 0.1-5% cpd. of molybdenum (calculated as MoO3) and 0-10% cpds. of aluminium and/or manganese (calculated as Al2O3 or MnO2). Pref. (I) is NR R -Y-NR R , (II) is HO-Y-NR R and (III) is NHR R . R , R = 1-20C alkyl, 3-12C cycloalkyl, aryl, 7-20C aralkyl or 7-20C alkaryl; or R +R = (CH2)m-X-(CH2)n; R , R = H or as R , R ; X = O, CH2 or NR ; R = 1-20C alkyl, 3-12C cycloalkyl, aryl, 7-20C aralkyl or 7-20C alkaryl; Y = 2-12C alkylene chain, opt. substd. by 1-5 1-4C alkyl.