One‐Step Synthesis of Singly Bridged Biscalix[4]arenes with Oligooxyethyleneethyl Spacers

Abstract Here we describe the one‐step synthesis of a series of singly bridged biscalix[4]arene derivatives connected by ethylene or oligooxyethyleneethyl chain through the reaction of calix[4]arene with corresponding ethylene or oligoethylene glycol ditosylates in the presence of sodium hydride in toluene. A 1,2‐bis(ethylene) doubly bridged bis‐p‐tert‐butylcalix[4]arene was also obtained as a by‐product. Keywords: biscalixarenecalixareneonestepsingly bridgedsynthesis