Application of 7-amino coumarins for the synthesis of novel and thermally stable water-insoluble azo-coumarin dyes

摘要

In this work, a series of novel azo-coumarin dyes were successfully synthesized by the diazotization of 7-amino coumarins followed by coupling with phenol derivatives. The diazotization and subsequent azo-coupling generated the related azo dyes at 0-5 degrees C in short reaction times with a simple experimental procedure. The spectral analysis of the resulted compounds was confirmed the proposed structures. By this development, the scope of hetero-cyclic compounds was increased.