A series of nine N-(4-substituted phenyl)-6-chloro-5- fluoronicotinamides exhibited excellent correlations of their carbonyl 13C shifts (5CO,ppm as measured in DMSO) with the standard Hammett substituent constants (c?R) of the substituent inthe 4-position. The linear relationship was defined by the equation 8CO ¦ 1.22
Setliff, Frank L.; Hawley, John W.; and Toland, Alan D.
"Hammett Correlations of Carbonyl 13C Chemical Shifts in a Series of N-(4-Substituted Phenyl)-6-Chloro-5-Fluoronicotinamides,"
Journal of the Arkansas Academy of Science: Vol. 49
, Article 35.
Available at: http://scholarworks.uark.edu/jaas/vol49/iss1/35