Magnetic Resonance in Chemistry p. 511 - 517 (1988)
Update date:2022-08-05
Topics:
Redondo, Jordi
Sanchez-Ferrando, Francisco
Valls, Montserrat
Virgili, Albert
The 80 MHz 1H NMR and 20 MHz 13C NMR spectra of five 4-methylcoumarins, six 4-methyl-2(1H)-quinolones and nine 3-methylbenzofurans, including six new compounds, were fully assigned.Homonuclear 1H<1H> NOEs and selective heteronuclear 13C<1H> NOEs were measured after low-power pre-saturation of the methyl protons.Indirect, negative heteronuclear NOE enhancements were found in suitable three-spin systems of the 13C-1H-<1H> type, and their magnitude was found to be dependent on ring size.The first examples of indirect, heteronuclear NOE enhancements on non-protonated carbons are described.KEY WORDS Heteronuclear NOE Selective heteronuclear 13C<1H> NOE Indirect negative NOE 13C-1H-<1H> three-spin effects Coumarins 2(1H)-Quinolones Benzofurans.
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