Production of high-quality aromatic amino azo compounds by the r

Details Production of high-quality aromatic amino azo compounds by the r Production of high-quality aromatic amino azo compounds by the r

1979-01-09

1981-07-21

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260140, 423390, C07C10706, C07C11500, C09B 2700

Patent

active

042798159

ABSTRACT:
A 1,3-diaryl triazene, in a solution obtained by the diazotization-coupling of a primary aromatic monoamine with a gas containing NO and NO.sub.2, which solution contains the monoamine and up to about 30 percent by weight of the triazene, based on the weight of the solution, is contacted with 0.4-2.0 percent of a strong acid, preferably nitric acid (based on the weight of the triazene-containing solution), at 50.degree.-120.degree. C. The triazene rearranges to an aromatic amino azo compound in a high para/ortho isomer ratio with minimum formation of binuclear by-products.

REFERENCES:
patent: 1977266 (1934-10-01), Dahlen
patent: 2133037 (1938-10-01), Moyer
patent: 2538431 (1951-01-01), Shulman
patent: 2809964 (1957-10-01), Baggenstoss et al.
patent: 2894942 (1959-07-01), Hydro et al.
patent: 4018751 (1977-04-01), Trecek
patent: 4020052 (1977-04-01), Detrick

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