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Carbon Magnetic Resonance Spectra of α, β, γ, δ‐ and α, β, α′, β′‐ Unsaturated Ketones
Author(s) -
Hollenstein R.,
von Philipsborn W.
Publication year - 1972
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.19720550622
Subject(s) - chemistry , chemical shift , protonation , spectral line , substituent , carbon fibers , coupling constant , resonance (particle physics) , proton , spectroscopy , fluorine , carbon 13 , nuclear magnetic resonance spectroscopy , analytical chemistry (journal) , photochemistry , nuclear magnetic resonance , stereochemistry , organic chemistry , ion , atomic physics , physics , materials science , particle physics , astronomy , quantum mechanics , composite number , composite material
Carbon‐13 spectra of a series of 26 unsaturated ketones ( ortho ‐ and para ‐cyclo‐hexadienones and corresponding open‐chain analogues) have been measured by Fourier ‐transform. Pulse spectroscopy. A complete analysis has been achieved by means of double resonance experiments using noise‐modulated and coherent off‐resonance proton irradiation and with the aid of non‐decoupled spectra. Chemical shifts are interpreted in terms of charge distribution in the dienone system and of methyl substituent effects. Carbon chemical shifts were also obtained for O‐protonated ortho ‐ and para ‐cyclohexadienones. One‐bond and long‐range carbon‐proton and carbon‐fluorine spin coupling constants are reported for several compounds.