Organic Magnetic Resonance p. 55 - 57 (1982)
Update date:2022-08-04
Topics: Steric Effects Aromatic Ring Substituents 13C Chemical Shift 1H Chemical Shift Conjugation and Resonance
Solcaniova, E.
Hrnciar, P.
Liptaj, T.
Substituent effects on the 13C and 1H chemical shifts have been studied for derivatives of 3-benzylidene-2,4-pentanedione.A significant correlation has been found between chemical shifts of the Z carbonyl group and (C-2) and Hammett constants, while no correlation has been found for the E carbonyl group (C-4).Attempts have been made to determine the structural factors which influence these effects.The conformation of 3-benzylidene-2,4-pentanediones has been determined by 13C and 1H NMR spectroscopy.
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