Synthesis and Electrogenerated Chemiluminescence of Donor-Substituted Phenylethynylcoumarins
作者:Arumugasamy Elangovan、Jui-Hsien Lin、Shu-Wen Yang、Hsien-Yi Hsu、Tong-Ing Ho
DOI:10.1021/jo0493424
日期:2004.11.1
Two series of donor-bearing phenylethynylcoumarins have been synthesized, and their photophysical properties have been evaluated. Chemiluminescence was observed through the annihilation of their electrogenerated radical ions and was found to be only slightly affected by the presence of various donor groups on the phenyl moiety linked through the C-C triple bond. The overall properties of the two series of compounds are discussed with respect to their structures. The observed electronic absorption properties are explained with the help of computational studies.
A visible-light-induced photocatalyst-free approach for C-3 dicarbonyl coumarin production
A mild and efficient visible-light-induced synthesis of C-3 dicarbonyl coumarins from 3-arylacetylene coumarins without a photocatalyst was reported. This iodide-mediated method exhibited broad substrate scope and good functional group tolerance, and a series of C-3 dicarbonyl coumarins were obtained in moderate to excellent yields. Based on the control experimental results, it was found that the