Synthesis of fully lower-rim, carbonate-bridged calix[8]arenes and their curing behavior

Novel fully lower-rim, carbonate-bridged calix[8]arene derivatives were suc cessfully synthesized in high yield by the condensation of p-alkyl substitu ted calix[8]arenes with triphosgene. Different bases and catalysts were use d for the preparation depending on the p-alkyl substituted groups of the ca lix[8]arenes. The conformational features of the derivatives were examined by H-1 NMR analysis. Thermosetting formulations were prepared from a mixtur e of bisphenol A polycarbonate with calix[8]arene carbonate derivatives usi ng sodium benzoate as a catalyst. Their crosslinking behaviors were studied using differential thermal/thermogravimetric analysis. No glass-transition temperatures were observed after annealing at 280-300 degreesC. (C) 2001 J ohn Wiley & Sons. Inc.