| 摘要 |
<p>Water-soluble monoazo dyes which, in the form of the free acids, have the formula:- <CHEM> wherein R<1> represents hydrogen or optionally substituted alkyl, R<2> represents optionally substituted alkyl or optionally substituted aryl, R<3> represents hydrogen, halogen, lower alkyl or lower alkoxy, R<4> represents hydrogen, halogen, lower alkyl, lower alkoxy or acylamino, R<5> represents hydrogen or optionally substituted alkyl and R<6> represents hydrogen, optionally substituted alkyl or optionally substituted aryl or R<5> and R<6> together with the attached nitrogen atom form a 5- or 6-membered heterocyclic ring. The dyes are applicable as acid dyes to natural and synthetic polyamide textiles giving non-phototropic yellow to red shades.</p> |
