This invention relates to a process for producing ring alkylated aromatic amines. In the process an aromatic amine is reacted with an olefin using gamma alumina as a catalyst. Under the conditions of the process the catalyst is extremely active and with amines that are capable of alkylation at the ortho and para positions, high selectivity to the ortho alkylated isomer can be achieved. The catalyst is also effective for producing unsymmetrical disubstituted alkyl aromatic amines, e.g., ethyl or propyl toluidine where one ortho position is substituted with a methyl group and the other substituted with an ethyl or propyl group.
本发明涉及一种生产环烷基芳香胺的方法。在该方法中,芳香胺与烯烃在伽马氧化铝催化剂的作用下反应。在该方法的条件下,催化剂极为活性,并且对于能够在邻位和对位发生烷基化的胺,可以实现对邻位烷基化异构体的高选择性。该催化剂还可以有效地生产非对称二取代烷基芳香胺,例如,乙基或丙基甲
苯胺,其中一个邻位被甲基取代,另一个邻位被乙基或丙基取代。