Production method of 4,6-diaminoresorcin

Details Production method of 4,6-diaminoresorcin Production method of 4,6-diaminoresorcin

2005-12-13

2005-12-13

Vollano, Jean F. (Department: 1621)

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

Organic compounds

Sulfonic acids or salts thereof

Reexamination Certificate

active

06974881

ABSTRACT:
The present invention relates to a novel production method of 4,6-diaminoresorcin, and to 2-sulfonic acid-4,6-dinitroresorcin as its intermediate and salts thereof. The target compound is obtained by (R1) sulfonating resorcin (A) to obtain resorcin 2,4,6-trisulfonate (B), (R2) nitrating the compound (B) to obtain 2-sulfonic acid-4,6-dinitroresorcin (C), (R3) hydrolyzing the compound (C) to obtain 4,6-dinitroresorcin (D), and finally (R4) reducing the compound (D) to obtain 4,6-diaminoresorcin (E):

REFERENCES:
patent: 5371291 (1994-12-01), Nader
patent: 5410083 (1995-04-01), Nader
patent: 2 777 564 (1999-10-01), None
CA:133:335633 abs of EP104864 Nov. 2000.
Podstata, J. et al., “Sulfonations. X. The formation of sulfonated resorcinols and their azo coupling.” Chemical Abstracts, vol. 68, No. 10, Mar. 4, 1968, Columbus, Ohio.

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