Strong Coupling in Nuclear Resonance Spectra. II. Field Dependence of Some Unsymmetrical Three-Spin Spectra

Abstract

Magnetic resonance spectra are calculated and compared with experiment for the vinyl group of styrene, 2,4‐dichloroaniline, and 2,5‐dichloroaniline at various magnetic field strengths. Some simple rules are presented which facilitate the determination of chemical shifts and coupling constants, including the signs of the latter. One of the spectra illustrates the occasional necessity for experiments at more than one field strength if the parameters are to be determined unambiguously. In each case the shielding and coupling constants are found to be field‐independent within experimental accuracy.