NMR spectroscopic investigation of p-substituted 2,4,4,6-tetraphenyl-1,4-dihydropyridines and their oxa and thia analogues
1989 ◽
Vol 54
(7)
◽
pp. 1854-1869
◽
Keyword(s):
The 1H, 13C and 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-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 trifluoroacetic acid were investigated by NMR spectroscopy.
1997 ◽
Vol 62
(5)
◽
pp. 746-751
◽
1991 ◽
Vol 56
(9)
◽
pp. 1908-1915
◽
Keyword(s):
Keyword(s):
Keyword(s):
1982 ◽
Vol 60
(11)
◽
pp. 1304-1316
◽
1984 ◽
Vol 2
(2)
◽
pp. 449-467
◽