Polyethers containing coumarin dimer components in the main chain. I. Synthesis by photopolymerization of 7,7′-(polymethylenedioxy) dicoumarins

Yun Chen, Chuen Sheng Jean

研究成果: Article同行評審

16 引文 斯高帕斯(Scopus)

摘要

Eight 7,7′-(polymethylenedioxy)dicoumarins were successfully synthesized by solution condensation of 7-hydroxycoumarin (umbelliferone) or 7-hydroxy-4-methylcoumarin (4-methylumbelliferone) with various dibromoalkanes. Upon benzophenone-sensitized irradiation with 350 nm light in dichloromethane, the terminal coumarin chromophores dimerize to form polyethers containing coumarin dimer components in the main chain. The configurations of the coumarin dimer linkages were characterized by 1H-NMR spectra. For unsubstituted dicoumarins, the resulting polyethers consist mainly of syn and anti head-to-head coumarin dimer linkages. However, the configurations are syn and anti head-to-tail for those from 4-methyl-substituted dicoumarins. The highest reduced viscosity is 0.23 dL/g obtained with polyether from 7,7′-(decamethylenedioxy)dicoumarin. The photopolymerization in dichloromethane obeys zero order and first order with respect to coumarin chromophore and benzophenone, respectively.

原文English
頁(從 - 到)1749-1758
頁數10
期刊Journal of Applied Polymer Science
64
發行號9
DOIs
出版狀態Published - 1997 五月 31

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 表面、塗料和薄膜
  • 聚合物和塑料
  • 材料化學

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