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Zur Frage der Deprotonierung primärer und sekundärer Aminogruppen beim Kobaltieren von o ‐Hydroxy‐ o ′‐amino (bzw. alkyl‐amino)‐azofarbstoffen vom Typus Phenyl‐azonaphtalin
Author(s) -
Schetty G.
Publication year - 1969
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19690520703
Subject(s) - chemistry , medicinal chemistry , naphthalene , benzene , electrophile , alkyl , titration , stereochemistry , organic chemistry , catalysis
Phenyl‐azo naphthalene dyestuffs, which are substituted in o and in o ′ position by hydroxy and amino (or alkylamino) groups, have been metallised with agents releasing either Co II ions or Co III ions, the 1:2 complexes formed being examined by means of electrophoresis and alkalimetric titrations. The amino or alkylamino groups are deprotonised only if they are in the naphthalene radical, or, if present in the benzene radical they are acidified by electrophilic substituents. Metallising with Co II ions yielded usually 1:2 Co III complexes. With one particular dyestuff, however, a 1:2 Co II complex was obtained; it is assumed that this is due to a relatively lower oxidation potential of this dyestuff.