125889-63-6Relevant academic research and scientific papers
REACTION OF ORGANOLITHIUM COMPOUNDS WITH 1-SUBSTITUTED 2,4,6-TRIPHENYLPYRIDINIUM PERCHLORATES
Schwarz, Marian,Kuthan, Josef
, p. 1880 - 1887 (2007/10/02)
The reaction of organolithium compounds with 1-substituted 2,4,6-triphenylpyridinium perchlorates Ia-Ic produces mixtures of 1,4-dihydropyridines IIa-IIe and 1,2-dihydropyridines IIIa-IIIe.Analogous reactions of phenylmagnesium bromide with compounds Ia-Ic proceed with very low conversions (less than 1percent).Photochromism in visible range is observed only with the compounds II which have two aromatic substituents at 4-position, whereas compounds III and IId show no visible photochromism.The molecular spectra of the compounds newly prepared are discussed.
NMR SPECTROSCOPIC INVESTIGATION OF p-SUBSTITUTED 2,4,4,6-TETRAPHENYL-1,4-DIHYDROPYRIDINES AND THEIR OXA AND THIA ANALOGUES
Schwarz, Marian,Trska, Petr,Kuthan, Josef
, p. 1854 - 1869 (2007/10/02)
The 1H, 13C, 19F NMR spectra of photochromic p-substituted 2,4,4,6-tetraphenyl-1,4-dihydropyridines IIa-IIg, 1-methyl-2,4,4,6-tetraphenyl-1,4-dihydropyridines IIIa-IIIg, 2,4,4,6-tetraphenyl-4H-pyrans IVa-IVh, and 2,4,4,6-t
