Long‐range carbon‐proton spin‐spin coupling constants. A ¹³C NMR study of monohalogen substituted ethanes and propanes

The analysis of single resonance 13 C FT NMR spectra has provided all long range 13 C‐ 1 H coupling constants in the monohalogeno‐ethanes and ‐propanes. In addition, all directly bonded 13 C‐ 1 H coupling constants, 13 C‐chemical shifts as well as 1 H‐NMR data are reported (together with literature values). Substituent effects on the geminal and vicinal 13 C‐ 1 H coupling constants are discussed in terms of electronegativity, conformation and bond polarization.