Process for the preparation of 4,6-diaminoresorcinol

Details Process for the preparation of 4,6-diaminoresorcinol Process for the preparation of 4,6-diaminoresorcinol

1995-10-27

1996-11-12

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564419, 564423, 568586, 568933, C07C21300

Patent

active

055741886

ABSTRACT:
4,6-diaminoresorcinol can be prepared in a plurality of steps in such a way that
a) 1,3-dichlorobenzene is nitrated with a mixed acid of HNO.sub.3, H.sub.2 SO.sub.4 and SO.sub.3 at 0 to 40.degree. C. in anhydrous H.sub.2 SO.sub.4,
b) the resulting 1,3-dichloro-4,6/2,4-dinitrobenzene isomeric mixture is first reacted with benzyl alcohol in the presence of a strong base at -15.degree. C. to +15.degree. C. and then at 20.degree. to 40.degree. C. to give the dibenzyloxy compound and
c) the 1,3-dibenzyloxy-4,6-dinitrobenzene isomer arising in pure form in b) is converted to the 4,6-diaminoresorcinol by catalytic hydrogenation.

REFERENCES:
patent: H726 (1990-01-01), Brown et al.
patent: 4766244 (1968-08-01), Lysenko
patent: 5072053 (1991-12-01), Blank et al.
patent: 5414130 (1995-05-01), Lysenko et al.
E. Miller et al, "Methoden der Organischen Chemie" vol. IV/1C, p. 509, Georg Thieme Verlag, New York (1980).
Patent Abstract of Japan,, vol. 950, No. LX, Abstract of JP 07-648,321 (1995).

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