Napththylene-bis-2-benzimidazoles as optical

Naphthylene-bis-2-benzimidazoles as optical brighteners New cpds:- (where R = naphthylene; R' = H, alkyl, aralkyl, aryl, opt. substd.; R2 and R3 = H, halo, alkyl, alkoxy, aryl or COOH or SO3H or derivs. thereof, or R2 + R3 = C3-4 alkylene or a fused ring aromatic gp.) are prepd. by reaction (i)...

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Bibliographic Details
Main Authors SCHINZEL,ERICH,DR, PINTSCHOVIUS,ULRICH,DR, FRISCHKORN,HANS,DR, SMERZ,OTTO,DR
Format Patent
LanguageEnglish
German
Published 15.03.1971
Edition1
Subjects
BLEACHING LEATHER OR FURS
CHEMISTRY
DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS,YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS
FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
HETEROCYCLIC COMPOUNDS
LAUNDERING
METALLURGY
ORGANIC CHEMISTRY
TEXTILES
TREATMENT OF TEXTILES OR THE LIKE
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Summary:Naphthylene-bis-2-benzimidazoles as optical brighteners New cpds:- (where R = naphthylene; R' = H, alkyl, aralkyl, aryl, opt. substd.; R2 and R3 = H, halo, alkyl, alkoxy, aryl or COOH or SO3H or derivs. thereof, or R2 + R3 = C3-4 alkylene or a fused ring aromatic gp.) are prepd. by reaction (i) of 1 mol. of a naphthylene dicarboxylic acid (or a deriv.) with 2 mols or slighty more of an o-diamino benzene deriv. in the presence of a catalyst at 100 - 250 degrees C in the absence of oxygen, or (ii) of 1 mol. of a naphthalene dicarboxylic acid dichloride with 2 mols or slightly more of an o-nitroaniline deriv., reduction of the NO2 right arrows NH2 and ring closure.
Bibliography:Application Number: CH19700018906