Process for preparing 1,4-diaminoanthraquinone-2,3-disubstituted

Details Process for preparing 1,4-diaminoanthraquinone-2,3-disubstituted Process for preparing 1,4-diaminoanthraquinone-2,3-disubstituted

1987-01-06

1988-06-07

Raymond, Richard L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260378, C07C 9724, C07C143665

Patent

active

047495219

ABSTRACT:
1,4-Diaminoanthraquinone-2,3-disulfonic acid or salt thereof and 1,4-diaminoanthraquinone-2,3-dinitrile which are intermediate of anthraquinone dyes are economically prepared by allowing 1,4-diamino-2,3-dihalogenoanthraquinone to react with alkalimetal sulfite in aqueous solution in the presence of quaternary ammonium or phosphonium compound, while water is being removed, to obtain 1,4-diaminoanthraquinone-2,3-disulfonic acid or salt thereof and, if necessary, cyanogenating the reaction mixture above without removing the disulfonic acid or salt thereof produced above to obtain 1,4-diaminoanthraquinone-2,3-dinitrile. The quaternary ammonium or phosphonium compound is recovered from and re-used for the reactions above.

REFERENCES:
patent: 4519947 (1985-05-01), Hattori et al.

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