レゾルシノールノボラック誘導体の分解によるカリックスアレーンの生成

概要

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Formation of calixresorcinarene by acid-catalyzed degradation of resorcinol novolac derivative is described. Methylated resorcinol novolac (2) was prepared by hydrochloric acid-catalyzed condensation of 1, 3-dimethoxybenzene (resorcinol dimethyl ether) with paraformaldehyde in 2-ethoxyethanol at 50°C. And then 2 and conc. sulfuric acid (catalyst) in acetic acid solution was heated at 100°C for 5h to give calix [4] resorcinarene octamethyl ether (3) in 26% isolated yield. The structures of 2 and 3 were confirmed by <SUP>1</SUP>H NMR, IR and GPC analysis. This reaction will be developed for a recycling of thermosetting phenolic resins.
Japan Thermosetting Plastics Industry Associationの論文