Process for preparation of 3,3'- or 3,4'-diaminodiphenylmethane
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsKeizaburo Yamaguchi, Kenichi Sugimoto, Yoshimitsu Tanabe, Saburo Kawashima, Akihiro Yamaguchi
Life of this patent
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Abstract
Preparation of 3,3'- or 3,4'-diaminodiphenylmethane by catalytically reducing and dechlorinating, in the presence of a reduction catalyst, a dinitrobenzophenone compound having the formula ##STR1## wherein X is chlorine and attached to a position 4 or 6 on the benzene ring, and Y is hydrogen or chlorine with the proviso that when Y is hydrogen, the nitro group is attached to a position 3' or 4', and when Y is chlorine, Y is attached to a position 4' and the nitro group is attached to a position 3'.
Claims9
A process for the preparation of 3,3'- or 3,4'-diaminodiphenylmethane, which comprises catalytically reducing and dechlorinating, in the presence of a reduction catalyst, a dinitrobenzophenone compound having the formula ##STR3## wherein X is chlorine and attached to a position 4 or 6 on the benzene ring, and Y is hydrogen or chlorine with the proviso that when Y is hydrogen, the nitro group is attached to a position 3' or 4', and when Y is chlorine, Y is attached to a position 4' and the nitro group is attached to a position 3'.
Dependencies are inferred from the claim text.