The 13C NMR spectra of variously annulated methylfurocoumarins are reported. The assignments of chemical shifts for all the C resonances have been achieved by using carbon-proton coupling costants, relaxation efficiency considerations and shift effects caused by the introduction of methyl groups at various position of the furocoumarin nucleus. Substituent effects on chemical shifts and C-H coupling constants are discussed.
13C-NMR Spectra and carbon-proton coupling constants of various annulated furocoumarins
GUIOTTO, ADRIANO;MANZINI, PAOLO;CHILIN, ADRIANA;
1985
Abstract
The 13C NMR spectra of variously annulated methylfurocoumarins are reported. The assignments of chemical shifts for all the C resonances have been achieved by using carbon-proton coupling costants, relaxation efficiency considerations and shift effects caused by the introduction of methyl groups at various position of the furocoumarin nucleus. Substituent effects on chemical shifts and C-H coupling constants are discussed.
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