NMR spectroscopic investigation of p-substituted 2, 4, 4, 6-tetraphenyl-1, 4-dihydropyridines and their oxa and thia analogues

M Schwarz, P Trška, J Kuthan

Index: Schwarz, Marian; Trska, Petr; Kuthan, Josef Collection of Czechoslovak Chemical Communications, 1989 , vol. 54, # 7 p. 1854 - 1869

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Citation Number: 14

Abstract

Abstract The 1 H, 13 C and 19 F 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-tetraphenyl-4H-thiopyran V were inspected; it was found that compounds IIa-IIg occur in a dynamic equilibrium with their dihydro tautomer VIa-VIg. Also deuteriodeprotonation of IIa and IIIa and their reaction with ...