Novel Triphenylamine Appended 1,3-Alternate-Calix[4]arenes: Synthesis and Characterization

In the present study, two novel calix4]arene receptors containing triphenylamine units in 1,3-alternate conformation have been synthesized and characterized in detail. First, the 25,27-dipropoxy-26,28-bis(3-aminopropyl)oxy]-calix4]arene 4 and 25,26,27,28-tetra(3-aminopropyl)oxy]-calix4]arene 7 were prepared by using convenient reagents. Then, these amino derivatives of calix4]arene were converted to Schiff base derivatives appended to triphenylamine of calix4]arene (5 and 8) using 4-formyltriphenylamine via condensation. The 1,3-alternate conformation of the synthesized calix4]arenes was determined by ¹H and ¹³C NMR analyses. Also, their structures have been characterized by using ¹H and ¹³C NMR, infrared, and elemental analyses.

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