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The influence of methyl groups on the colour and dyeing properties of acid dyes derived from 1-amino-4-bromo-anthraquinone-2-sulphonic acid and arylamines

✍ Scribed by Yuzhen Zhang; Wenfu Hou


Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
291 KB
Volume
30
Category
Article
ISSN
0143-7208

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## Abstract 4‐(Dicyanomethylene)‐3‐methyl‐1‐phenyl‐2‐pyrazoline‐5‐one (1) readily reacts with α‐amino acids and their esters by Michael addition and subsequent elimination of HCN to the adducts 2a–k. One of these, 2i (obtained from methyl glycinate), adds stereoselectively to __N__‐phenylmaleimide