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13 C‐ and 1 H‐NMR. Spectra of ortho ‐benzoquinones. On the assignment problem in 13 C spectra
Author(s) -
Hollenstein R.,
Von Philipsborn Wolfgang
Publication year - 1973
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19730560123
Subject(s) - chemistry , heteronuclear molecule , spectral line , nmr spectra database , resonance (particle physics) , carbon 13 nmr , mass spectrum , carbon 13 , stereochemistry , nuclear magnetic resonance spectroscopy , organic chemistry , ion , atomic physics , nuclear physics , physics , astronomy
13 C‐ and 1 H‐NMR. spectra of ortho ‐benzoquinone 1 and its methyl derivatives have been analysed. By means of heteronuclear double resonance experiments it is shown that assignments given in the literature for the olefinic carbon resonances of 1 and of a series of substituted ortho ‐benzoquinones have to be inverted. 13 C‐carbonyl frequencies of various six‐membered cyclic ketones are presented.