75753-93-4Relevant articles and documents
An efficient synthetic approach towards new 5,5’-diaryl-2,2’-bipyridine-based fluorophores
Krinochkin, Alexey P.,Kopchuk, Dmitry S.,Chepchugov, Nikolay V.,Kim, Grigory A.,Kovalev, Igor S.,Rahman, Matiur,Zyryanov, Grigory V.,Majee, Adinath,Rusinov, Vladimir L.,Chupakhin, Oleg N.
, p. 1099 - 1103 (2017)
An efficient approach has been developed for the synthesis of 5,5′-diaryl-2,2′-bipyridines via their 1,2,4-triazine analogues. The notable advantages of the present method are: The possibility of varying the aromatic substituents in the positions 5 and 5′ of bipyridine core and the possibility for obtaining 2,2′-bipyridines bearing a fused cyclopentene core to increase the solubility in organic solvents. These 5,5′-diaryl-2,2′-bipyridines exhibited an intense emission in a range of ca. 422–521?nm in acetonitrile solution; depending on the nature of the aromatic substituents and the presence of annulated cyclopentene fragments. Apart from that, the significant bathochromic shifts of the both absorption and emission maxima were observed in comparison with a number of previously described similar structures. In some cases the significant increasing of the fluorescence quantum yields took place.
SYNTHESIS AND STRUCTURE OF MESOMORPHIC 2-CYANO-5--PYRIDINES
Pavlyuchenko, A. I.,Titov, V. V.,Smirnova, N. I.,Grachev, V. T.
, p. 681 - 684 (2007/10/02)
Liquid-crystal 2-cyano-5-pyridines were synthesized by the reaction of 1-dimethylamino-3-dimethylimmonia-2-propene perchlorates with 2-acetylfuran and subsequently through 2-furyl-5-pyrylium perchlorates and 2-(2-furyl)-5-pyridines by conversion of the latter to 5-alkyl(alkoxy)phenylpyridine-2-carboxylic acids, from which the cyano derivatives were obtained by the usual scheme through the amides.The intermediate arylfurylpyridines and arylpyridine-2-carboxylic acid imides also display liquid-crystal properties.
