A New Approach Towards Synthesis of Some Novel “Upper Rim” Functionalized Calixresorcinarene Schiff-basesKejal P. Jayswal, Jigar R. Patel, Vijay B. Patel and Mitesh H. Patel*
Chemistry Department, School of Sciences, Gujarat University, Ahmedabad-380009,
* Corresponding author: E-mail: firstname.lastname@example.org
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Synthesis of new “upper rim” functionalized calixresorcinarene Schiff-bases has been carried out by reacting tetraaminocalixresorcinarene with different aromatic aldehydes in ethanol at reflux temperature. The tetra-aminocalixresorcinarene, which can serve as very good precursor for various derivatizations at the extra annular position, was synthesized for the first time through tetra-azo intermediate, by first introducing the azo functionality at the upper rim, and subsequent reduction with Na2S2O4 in aq. NaOH. Synthesized Schiff-bases were characterized by elemental analysis, FT-IR, NMR and Mass spectral data. Their complexation ability with Cu(II) is also investigated.
Keywords: Calixresorcinarene; upper rim; Na2S2O4; Schiff-base