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.