Pure Quadrupole Resonance Determinations of Molecular Charge Distributions. II. Substituted Pyrimidines

The amount of double-bond character of the carbon-chlorine bond at the 2, 4, and 6 positions in twelve substituted chloropyrimidines has been estimated from the chlorine pure quadrupole resonance frequencies. If it is assumed that the nitrogens have a weak inductive effect upon adjacent ring positions, then the calculated values for the amount of double-bond character agree quite well with data obtained from experiments employing Zeeman splitting techniques applied to pure quadrupole resonance spectra.