Abstract
AbstractFive novel azo calix[4]arenes were reported. The p‐aminobenzaldehyde was diazotized with sodium nitrite in aqueous hydrochloride solution. Mono‐, bis‐, his‐ and tetrakis(p‐formylphenyl)azo calix[4]arenes (including proximal and distal isomers) were obtained respectively by diazo‐coupling in different molar ratio to calix[4]arene (1) under pH=7.5‐8.5 at 0‐5 C. All (p‐formylphenyl)azo calix[4]arenes were characterized by 'H NMR, 13C NMR, IR, MS (ESIMS) spectroscopies and elemental analysis.
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