Process for the preparation of a condensation product from pheno

Details Process for the preparation of a condensation product from pheno Process for the preparation of a condensation product from pheno

1980-01-31

1981-11-24

Brust, Joseph Paul

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D51300

Patent

active

043025820

ABSTRACT:
An improved process for preparation of a condensed product of phenothiazine and p-nitrosophenol which contains more than 60% by weight of indophenol S-oxide of the formula ##STR1## by condensing phenothiazine with p-nitrosophenol in sulphuric acid wherein the improvement comprises the phenothiazine being in 60 to 90% strength sulphuric acid at the time of addition of the p-nitrosophenol.

REFERENCES:
patent: 966092 (1910-08-01), Herz
patent: 1128370 (1915-02-01), Schmidt et al.
patent: 1867863 (1932-07-01), Muth
Beilsteins Handbuch der Organischen Chemie, vol. 27, 4th Ed., pp. 63, 64, 65, 67-68, (System No. 4198), 1937. Handbuch der Organischen Chemie, vol. 27, 4th Ed., Erstes Erganzungswerk, p. 226 (System No. 4198), 1938.
Lubs, "The Chemistry of Synthetic Dyes and Pigments", 1955, pp. 321-323.
Dutt., J. Chem. Soc., vol. 125, pp. 802-807, 1924.

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