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- W1992820281 abstract "The complete 1H NMR chemical shift assignments of 1,2,3,4,5,6,7,8-octahydroacridine (1), 1,2,3,4,5,6,7,8-octahydro-9-(3-pyridyl)acridine (2), 1,2,3,4,5,6,7,8-octahydro-9-(4-pyridyl)acridine (3) and the corresponding N(10)-oxides 1a, 2a and 3a, respectively, were achieved on the basis of 400 MHz 1H NMR spectra and proton–proton decoupling, HMQC and NOEDIFF experiments. The spectral data for the above compounds provided the first experimental evidence of the difference in the anisotropy effect of the two non-symmetrical moieties of the pyridine nucleus, and allowed us to ascertain that the shielding effect of the moiety defined by the C(2′)—N—C(6′) atoms is weaker than that of the C(3′)—C(4′)—C(5′) moiety. The 13C NMR spectra of 1–3 and 1a–3a and the effect of N(10)-oxidation on the 13C NMR chemical shifts are also discussed. The N-oxidation of 2 and 3 with m-chloroperbenzoic acid occurred regiospecifically, affording the N(10)-oxides 2a and 3a free of N(1′)-oxide isomers. Copyright © 2002 John Wiley & Sons, Ltd." @default.
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- W1992820281 date "2002-01-01" @default.
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- W1992820281 title "Hydroacridines: Part 23.1H and13C NMR spectra ofsym-octahydroacridine, its 9-(3-pyridyl) and 9-(4-pyridyl) derivatives and the correspondingN(10)-oxides. An experimental approach to the diamagnetic anisotropy of the pyridine nucleus" @default.
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- W1992820281 doi "https://doi.org/10.1002/mrc.996" @default.
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