The synthesis of some new derivatives of calix[4]arene containing azo groups

Five new compounds p-(4-n-butyl-phenylazo)calix[4]arene (), p-(4-phenylazophenylazo)calix[4]arene (), p-(4-acetanilidazo)calix[4]arene (), p-(N′-2-thiazol-2-ylsulfanylazo)calix[4]arene () and p-(2-thiazolazo)calix[4]arene () have been synthesized from calix[4]arene by diazo coupling with the corresponding aromatic amines. To elucidate the structures of the compounds elemental analyses, UV–vis, IR, 1H and 13C NMR spectral data have been used.