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- W2022284798 abstract "The structures of seven polysubstituted alkylpyridines, recently isolated from coal tar, were elucidated using their 13C NMR spectra. For tri- and tetra-substituted derivatives the correct isomeric structure was found from their conformity with the proximity effect, i.e. the deviations from additivity when calculating chemical shifts from substituent increments (SCS) for sterically crowded molecules. This effect manifests itself both on the ring and on the alkyl carbon signals, and in most cases shifts their position upfield." @default.
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- W2022284798 date "1984-10-01" @default.
- W2022284798 modified "2023-09-24" @default.
- W2022284798 title "Proximity effect in the13C NMR spectra of alkylpyridines: An aid in structure elucidation" @default.
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- W2022284798 doi "https://doi.org/10.1002/mrc.1270221005" @default.
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