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(a) Schematic route for the synthesis of calix[4]arene-based porous organic polymers (POPs) through Sonogashira–Hagihara cross-coupling (CalPs) followed by postsynthetic lithiation of the POPs using n-butyl lithium (CalP-Li). (b) Pictorial representation of iodine sequestrations by lithiated polycalix[4]arenes.
