bis-dcm type dyes: convenient method for synthesis of 2-(2, 6-bis(4-(dialkylamino)styryl)-4h -pyran-4-ylidene) malononitrile derivatives

An efficient and convenient method for synthesis of 2,6-bis (4-(dialkylamino) styryl)-4h-pyran-4-one starting from 4- (dialkylamino) benzaldehyde with 2,6-dimethyl-4h-pyran-4-one in the presence of meona as the base was described. additionally, preparation of novel compounds with bis-dcm-type skeleton for application in organic light-emitting diodes was developed via reaction of malononitrile as active methylene group with 2,6-bis (4-(dialkylamino) styryl) -4h-pyran-4-one derivatives. 1h and 13c nmr, ft-ir spectroscopy supported the predicted structure of the products. the uv-vis absorption spectra of synthesis compound were measured in diluted dichloromethane solution. maximum absorption (max) values differ from 460 to 496 nm, this absorption is due to π-π* transition.