6471-02-9Relevant academic research and scientific papers
EFFECT OF SRUCTURAL FACTORS ON THE FORMATION AND PROPERTIES OF ACYLAMINOANTHRAQUINONES
Kazankov, M. V.,Ginodman, L. G.,Mustafina, M. Ya.
, p. 306 - 313 (2007/10/02)
The N-methyl group prevents the acylation of α-aminoanthraquinones by acetic anhydride in the absence of acid catalysis.This is explained by hindrances for the abstraction of hydrogen atom from the 1-methylamino group, which is connected by an intramolecular hydrogen bond.Acid catalysis levels out the differences in the reactivity of the α-amino and α-methyl amino groups.The α-acetylamino groups have lower hydrolytic stability than the α-N-acetylmethylamino groups.These characteristics make it possible to realize a directed synthesis of acyl derivatives at theprimary or secondary α-amino groups of polyaminoanthraquinones.The introduction of acyl residues into the secondary α-amino groups completely excludes them conjugation with the anthraquinone ring, and an unexpectedly small hypsochromic shift of the absorption is observed in the 4-amino, 4-alkylamino, and particularly the 4-arylamino derivatives of 1-acylaminoanthraquinones.
Triazinyl dyes
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, (2008/06/13)
Vat dyestuffs of the formula EQU1 wherein R represents alkyl with 1 to 4 carbon atoms, R1 and R2 represent hydrogen or alkyl with 1 to 4 carbon atoms and each of A1 and A2 represents a vattable radical with 3 to 7 condensed rings are characterized by improved resistance to alkali and are suitable for dyeing and printing the most diverse materials, in particular fibers made from natural or regenerated cellulose.
