This paper deals with the analysis of the nuclear magnetic resonance spectrum of two pairs of two equivalent nuclei (of spin [Formula: see text])whose relative chemical shift is of the same order as the spin-coupling constants of the system (A 2 B 2 in the notation of Part I). The complete matrix is set up and correlated with the results of McConnell, McLean, and Reilly (4) for the corresponding theory with large chemical shiftsThe proton resonance spectrum of naphthalene is reported and is analyzed as an A 2 B 2 system on the hypothesis that spin couplings between protons on different rings are negligible. A complete analysis of the spectrum of o-dichlorobenzene, which represents a further example of an A 2 B 2 , system, is also given. The spectrum of 1-chloro-2-bromoethane at room temperature is also analyzed as an A 2 B 2 system.
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Pople et al. (1957) studied this question.