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Evidence for an Important 13C NMR Shielding Effect for Carbon Atoms Bearing a Heavy Chalcogen Substituent
An important 13C NMR shielding effect on carbons bearing a heavy chalcogen is demonstrated.This effect is parallel to that induced by iodine, but to a lesser extent.For acyclic compounds and for partially saturated heterocycles, there is an excellent linear correlation between the 13C chemical shifts of carbons bearing a chalcogen and carbons bearing a halogen atom in the corresponding compound.The linearity of the relationship is less satisfactory with heteroaromatic compounds.
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Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem