| abstract |
4-Substituted coumarin compounds having the general formula of n n nwhere R is H, CHO, OCH 3 , X, NO 2 , an alkyl having C 1-10 , —OCH 2 O—, an aryl being mono- or poly-substituted with CN or COOCH 3 with the aryl being a phenyl, naphthyl, or azaryl, or a coumarin group n n nthat is substituted with R 1 , R 2 , R 3 , R 4 , with R 1 , R 2 , R 3 , and R 4 being H, an alkyl having C 1-10 , X, NO 2 , CN, OCH 3 , COOCH 3 or OR 5 , R 5 being H or an alkyl having C 1-10 , and X being a halogen. |