Abstract
AbstractOne‐bond 37Cl/35Cl isotope effects on 13C NMR chemical shifts were used to assign the 1H and 13C NMR spectra of bis(4‐chlorophenyl)sulfone, 4,5‐dichlorophthalic acid and 2,2′‐thiobis(4,6‐dichlorophenol). The chlorine‐bonded carbons showed characteristic peaks separated by about 4 ppb with a 3 : 1 area ratio, corresponding to the natural abundance of 35Cl and 37Cl. The determination of the chlorine‐bonded carbon signals based on the isotope effects was useful when the empirical additivity rules of the chemical shifts and several 2D NMR techniques were insufficient for a complete definitive assignment. Copyright © 2001 John Wiley & Sons, Ltd.
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