Alkylarylamine prepn - by aromatic amine alkylation catalysed by aluminas with weakly acid function

摘要

Aluminas with pka 5, measured in water, are used as alkylation catalysts for prodn. of alkylarylamines by reacting aliphatic and/or araliphatic alcohols and/or corresp. olefins with aromatic amines at 140-350 (160-280) degrees C, esp. prepn. of p-alkylation products, e.g. p-alkylanilines, useful for polymer prodn. partic. prepn. of alpha, alpha'-bis(4-N-methylaminophenyl)-p-diisopropyl-benzene from N-methylaniline and alpha, alpha'-dihydroxy-p-diisopropylbenzene. Pref. catalyst conc. in reaction mixt. is 0.1-5 (0.2-3) wt.%/total wt. of reactants.