Process for manufacturing diaminonaphthalene

US4026944A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Walter Bohm · Leverkusen, DE
• Heinz U. Blank · Odenthal, DE
• Guido Skipka
• Friedrich Durholz

Key dates

• Filing date: Jul 9, 1975
• Grant date: May 31, 1977
• Expiry date: Jul 9, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/36
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Diamino naphthalene having the formula ##STR1## wherein R.sup.1 is hydrogen or amino is prepared by treating dinitro naphthalene having the formula ##STR2## wherein R.sup.2 is hydrogen or nitro WITH HYDROGEN IN THE PRESENCE OF HYDROGENATION CATALYSTS AND ORGANIC SOLVENTS HAVING THE FORMULA ##STR3## wherein R.sup.3 is hydrogen, halogen or alkyl; PA1 R.sup.4 is hydrogen, halogen, alkyl, hydroxy, alkoxy, amino, alkylamino, or dialkyl amino; PA1 R.sup.5 is hydrogen, chlorine, alkyl, hydroxy, alkoxy, amino, alkylamino or dialkyl amino; PA1 R.sup.6 and R.sup.7 are the same or different and are either hydrogen or alkyl or together form a --(CH.sub.2).sub.4 group, optionally substituted once or several times by methyl and/ethyl.