Process for the preparation of para-nitroso-diphenylhydroxylamin

Details Process for the preparation of para-nitroso-diphenylhydroxylamin Process for the preparation of para-nitroso-diphenylhydroxylamin

1978-01-30

1978-12-12

Douglas, Winston A.

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

Organic compounds

Carboxylic acid esters

560 21, 560 45, 560 46, 560 47, 260571, 260576, C07C 7946, C07C 8524, C07C10172

Patent

active

041297407

ABSTRACT:
An improved process for the preparation of para-nitroso-diphenylhydroxylamines is disclosed. One member of the group consisting of nitrosobenzene, ortho-substituted nitrosobenzenes, meta-substituted nitrosobenzenes, ortho-meta-disubstituted nitrosobenzenes and para-substituted nitrosobenzenes is reacted with one member selected from the group consisting of nitrosobenzene, ortho-substituted nitrosobenzenes, meta-substituted nitrosobenzenes, and ortho-meta-disubstituted nitrosobenzenes, in the presence of an acid catalyst. The improvement comprises utilizing as the acid catalyst an acid selected from the group consisting of aliphatic, cycloaliphatic, and aromatic sulfonic acids, having a pK.sub.a equal to or less than one, perchloric acid, and trifluoroacetic acid, in an amount equal to or greater than 0.5 mol of acid per mol of nitroso reactants, and performing the reaction at a temperature from about -20.degree. C to about 60.degree. C.

REFERENCES:
patent: 3933848 (1976-01-01), Feinstein et al.
Bamberger et al., "Berichte," vol. 31, pp. 1513-1522, (1898).
Boyer, "J. Org. Chem," vol. 24, p. 2038 (1959).

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