| 摘要 |
A method for preparing 4,4-methylene bisaniline (or its derivs.) or formula (I) comprises (a) reacting aniline (or its derivs.) with formuldehyde in 35% HCl soln. in the presence of antimony (or antimony cpd.) catalyst at 50-80 deg.C for 0.5-2 hrs., treating it with NaOH soln., and adjusting the pH or the reactant soln. to 8-11. Pref. the molar ratio of formaldehyde to aniline is 0.4-0.7; the weight ratio of antimony to aniline is 0.1-2. wt.%. In (I), R = halogen, alkyl, alkoxy, carboxyl or alkoxycarbonyl; n = 0-3. The method gives high purity (92%) and good yields (98%).
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