Synthesis and characterization of novel chiral calix[4]arene bearing (R)-(+)-1-phenylethylamine bonded silica particles

Abstract

Two novel chiral di-and tri-amide derivatives of p-tert-butylcalix[4]arene were synthesized by (R)-(?)-1-Phenylethylamine via convenient reactions and then immobilized on aminopropyl functionalized silica particles. The prepared chiral calix[4]arenes and their silica polymers (Calix-SP1 and Calix-SP2) were characterized using 1 H NMR, 13 C NMR, FT-IR, and thermal and elemental analysis techniques.