Carbon NMR Spectroscopy 13 C-NMR Spectroscopy Chemical Shift.
Negative values are possible, but rare.
Chemical shift data can be calculated from any type of 13 C experiment. In otherwise equivalent environments, the fewer the H's on the carbon, the greater the d . Carbonyl carbons are particularly characteristic, absorbing at about 170-220 ppm. No effect from neighboring hydrogens. Optimized to determine chemical shift.