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Methylated derivatives of 1,5‐diamino‐4,8‐dihydroxyanthraquinone and 1,8‐diamino‐4,5‐dihydroxyanthraquinone — blue dyes for synthetic‐polymer fibres
Author(s) -
Peters A T,
Ma Xisai
Publication year - 1992
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1992.tb01477.x
Subject(s) - chemistry , derivative (finance) , solvent , polymer , organic chemistry , economics , financial economics
The synthesis of a series of /V ‐methylated derivatives of 4,5‐diamino‐1,8‐dihydroxyanthraquinone (DACZ) and of 4,8‐diamino‐1,5‐dihydroxyanthraquinone (DAAR) is described. All possible N ‐methyl derivatives of DAAR were obtained, but the tetramethylated derivative of DACZ could not be isolated. Attempts to synthesise an assymetrical NN ‐dimethyl derivative of DACZ were also unsuccessful, only an NO ‐dimethylated derivative being obtained. The colour of the dyes is discussed in relation to the degree of methylation, and solvent effects on absorption maxima are also reported.