Magnetic Resonance in Chemistry p. 348 - 354 (1989)
Update date:2022-08-28
Topics:
Osborne, Alan G.
The 13C chemical shifts and 13C-1H coupling constants of some methoxycoumarins are reported.Some earlier spectral assignments, including those for citropten (limettin), require revision.Methoxy substituent effects on long-range 13C-1H couplings in coumarins are highlighted.Peri-proximity effects for the methyl-methoxy and mehoxy-methyl couples are derived, and the value of these effects in the assignment of peri-substituted compounds is illustrated. KEY WORDS 13C NMR Methoxycoumarins Citropten Limettin 13C-1H coupling constant Peri-proximity effects
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