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Recently much interest has been shown in the study of 13C-'H coupling constants.1 The data on 13C-'H couplings in flexible saturated systems are, however, rather limited, owing to extreme complexity of their proton-coupled 13C NMR spectra.We wish to report here the experimental values of all possible 13C-]H coupling constants in cyclohexane which is a classical example of a conformationally flexible system. The data discussed below were obtained from the lowand hightemperature proton-coupled 13C spectra of cyclohexane-

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