Collect. Czech. Chem. Commun.
1989, 54, 1880-1887
https://doi.org/10.1135/cccc19891880
Reaction of organolithium compounds with 1-substituted 2,4,6-triphenylpyridinium perchlorates
Marián Schwarz and Josef Kuthan
Department of Organic Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6
Abstract
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 1%). 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.
