摘要:
                                4,6-Disubstituted-3-cyano-2-methylpyridines, easily prepared by treating alpha,beta-unsaturated carbonyl compounds with beta-aminocrotononitrile in the presence of potassium tert-butoxide, have been found to show intense fluorescence in the region of 400-552 nm.  3-Cyano-4,6-bis(4-methoxyphenyl)-and 3-cyano-4,6-di(2-furyl)-2-methylpyridines show more intense fluorescence than 7-diethylamino-4-methylcoumarin.  The 3-cyano group of pyridines increases the fluorescence intensities and improves photostabilities.