Synthesis and characterization of new symmetrical 3,6-bis[(25,26,27-tripropoxy-28-(3-(4-iodophenyl) propoxy)-p-tert -butyl calix[4]arene ethynyl]-9Hfluoren- 9-one by Sonogashira coupling as a novel precursor for synthesis of quinodimethane (QDM)

Novel symmetrical 3,6-bis[(25,26,27-tripropoxy-28-(3-(4-iodophenyl)propoxy)-p-tert-butyl calix[4]arene ethynyl]-9H-fluoren-9-one with a cone conformation was synthesized by palladium-catalyzed coupling of (25,26,27-tripropoxy-28-(3-(4-iodophenyl)propoxy)-p-tert-butyl calix[4]arene and 3,6-diethynyl-9H-fluoren- 9-one. Its structure was confirmed by FT-IR, $^ 1 H$-NMR, and $^ {13} C$-NMR spectroscopy, and elemental analysis and positive ion FAB mass spectrometry.

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