Patent · US Expired

Process for preparing N,N-disubstituted p-phenylenediamine derivatives

US4474987A · kind A · utility

1Cited by

2References

7Claims

0Family size

Assignee

Merck Patent GmbH · DE

Inventors

Bruno Wollemann · Heilbad Heiligenstadt, DE
Hartmut Hartner · Weiterstadt, DE
Hans Bardonner · Bad König, DE

Key dates

Filing date	Apr 5, 1982
Grant date	Oct 2, 1984
Priority date	—
Expiry date	Apr 5, 2002

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C303/40
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for preparing an N,N-disubstituted p-phenylenediamine of the formula ##STR1## wherein R.sup.1 is alkyl of 1-6 C atoms, R.sup.2 is alkyl of 1-6 C atoms or alkyl of 1-6 C atoms which is substituted by OH, lower alkoxy, a sulfo group or an alkylsulfonamido group and R.sup.3 is hydrogen or lower alkyl PA1 or an acid addition salt thereof, PA1 comprises adding an alkyl nitrite, as a nitrosation agent, PA1 to an aqueous, acid suspension of the corresponding aniline derivative of the formula ##STR2## thereby forming the corresponding N,N-disubstituted p-nitroso-aniline, and subsequently hydrogenating the latter without isolation thereof from the reaction mixture.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.