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13 C‐NMR spectra and carbon‐proton coupling constants of variously annulated furocoumarins
Author(s) -
Guiotto A.,
Manzini P.,
Chilin A.,
Pastorini G.,
Rodighiero P.
Publication year - 1985
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570220306
Subject(s) - chemistry , furocoumarins , chemical shift , furocoumarin , coupling constant , proton , substituent , spectral line , carbon 13 nmr , proton nmr , nmr spectra database , carbon 13 , computational chemistry , stereochemistry , photochemistry , nuclear physics , dna , biochemistry , physics , particle physics , astronomy
The 13 C‐nmr spectra of variously annulated methylfurocoumarins are reported. The assignments of chemical shifts for all the C resonances has been achieved by using carbon‐proton coupling constants, relaxation efficiency considerations and shift effects caused by the introduction of methyl groups at various positions of the furocoumarin nucleus. Substituent effects on 13 C chemical shifts and carbon‐proton coupling constants are discussed.