Chinese Academy of Sciences

Jianguang Lei

Guoqiang Lin

Minghua Xu

Jin Ren

4-Substituted coumarin compounds having the general formula of where R is H, CHO, OCH, X, NO, an alkyl having C, &#x2014;OCHO&#x2014;, an aryl being mono- or poly-substituted with CN or COOCHwith the aryl being a phenyl, naphthyl, or azaryl, or a coumarin group that is substituted with R, R, R, R, with R, R, R, and Rbeing H, an alkyl having C, X, NO, CN, OCH, COOCHor OR, Rbeing H or an alkyl having C, and X being a halogen.

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Jianguang Lei