Natural-abundance carbon-1 3 nuclear magnetic resonance spectra, with proton noise decoupling, have been obtained for pure meso-and rac-2,4-dichloropentane, pure meso-and rac-2,3-dichlorobutane, and two samples of poly(viny1 chloride) of different stereochemical configuration. The chemical shifts of the chlorinated hydrocarbon models are interpreted in terms of their rotational isomers. The sensitivity of 13C shifts to stereoisomers was found to be an order of magnitude greater than that of proton shifts. Triad sequences were easily distinguished for poly(viny1 chloride), but the diad, tetrad, or pentad structures may be more difficult to extract from

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