Substituent effects on 13C and 1H chemical shifts in 3-benzylidene-2,4-pentanediones |
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Authors: | E. Sol
niova,P. Hrn
iar,T. Liptaj |
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Affiliation: | E. Solčániova,P. Hrnčiar,T. Liptaj |
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Abstract: | 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 (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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