Geminal carbon‐proton spin‐spin coupling constants in ethyl, isopropyl and tert‐butyl compounds

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AbstractThe geminal 13C1H coupling constants in ethyl, isopropyl and tert‐butyl compounds having elements of the first row of the Periodic Table and halogens as substituents are determined by single resonance 13C FT NMR spectroscopy. In addition, the values of directly bonded 13C13C coupling constants are given. The substituent electronegativity dependence of the geminal 13C1H coupling constant is discussed. It is concluded that the influence exerted by a β‐methyl substituent on the geminal 13C1H coupling constant of 13Cα‐Cβ‐1H fragments is not constant and hence no simple additivity relation can be established for this coupling constant.