A branched chain polyalkylene polyamine ("PAPA") having plural amine groups, including a secondary amine group intermediate terminal primary amine groups one of which is hindered, and having at least two carbon atoms between each group, is selectively reductively alkylated with a ketone. The reaction provides a convenient method for selectively reductively alkylating a PAPA having a hindered primary amine group, the method comprising contacting the PAPA with hydrogen and the ketone in the presence of a catalytically effective amount of a Group VIII metal on a catalyst support, at a pressure in the range from about 500-1000 psi and a temperature in the range from about 50.degree. C. to about 200.degree. C. for a period of time sufficient to preferentially alkylate the unhindered amine primary terminal amine group. The alkylation proceeds essentially without alkylating either the sterically hindered terminal primary amine group or the intermediate unhindered secondary amine group.
具有多个胺基的支链聚烯基聚酰胺(“PAPA”),包括一个中间的次级胺基和至少两个碳原子在每个基团之间,其中一个基团是受阻的末端主要胺基团,可以通过酮选择性还原烷基化。该反应提供了一种方便的方法,用于选择性还原烷基化具有受阻主要胺基团的PAPA,该方法包括在催化剂支持物上的Group VIII
金属的催化剂作用下,在约500-1000 psi的压力和约50°C至约200°C的温度下,将PAPA与氢和酮接触一段时间,以优先烷基化不受妨碍的末端主要胺基团。烷基化过程基本上不会烷基化受立体阻碍的末端主要胺基团或中间不受阻的次级胺基团。