Synthesis of novel Schiff bases as stable enol‐imine‐containing diazene bonds and pyrimidines using trimethinium salts

Abstract

Novel derivatives of Schiff bases with diazene bonds and six new 2,5‐disubstituted pyrimidine derivatives were synthesized by reaction of 2‐substituted trimethinium salts with 4‐aminoazobenzene or benzamidine hydrochloride, respectively, by a simple method and using inexpensive reagents. The purity and molecular structure of the new compounds were determined by elemental analysis, mass spectrometry, infrared, ultraviolet/visible, as well as proton nuclear magnetic resonance (1H NMR) and carbon‐13 nuclear magnetic resonance (13C NMR) spectroscopy.