Signs of methyl–methyl proton spin–spin coupling constants in xylene derivatives (interbenzylic coupling)

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Abstract
The signs of the intermethyl proton spin–spin coupling constants in ortho, meta, and para xylene derivatives (interbenzylic coupling) have been determined by double resonance techniques. [Formula: see text] [Formula: see text] and [Formula: see text] are positive, negative, and positive, respectively, in agreement with the predictions of theories based on σ–π interactions. The magnitudes of the coupling constants are discussed in terms of the values predicted by these theories.

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