Patent ID: 6380433
Filing Date: 2002-04-30
Classification: C07C

Abstract:
A process for the preparation of diamino diphenyl methane and its higher homologues having general formula (I): wherein &PHgr; represents a phenyl group, R represents a hydrogen atom or a C1-C8 (iso)alkyl, C4-C10 cycloalkyl or C6-C12 aromatic radical, and n is an integer greater than or equal to 1 and is such as to give a functionality ranging from 2 to 4, which comprises the re-arrangement reaction of the intermediate having general formula (II): &PHgr;â€”NRâ€”CH2â€”RNâ€”&PHgr;â€ƒâ€ƒ(II) â€ƒin the presence of a zeolite in acid form having a spaciousness index ranging from 2.5 to 19, extremes included.