ORGANIC CHEMISTRY Chapter g Certain differences and similarities of H-NMR and C-nMr o C has only about 1. 1% natural abundance(of carbon atoms) o 2C does not exhibit NMR behaviour(nuclear spinI=0) o as a result 3c is about 400 times less sensitive than h nucleus to the nmr phenomena o due to low abundance we do not usually see 13C-13C coupling o Chemical shift range is normally 0 to 220 ppm Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 9 Certain differences and similarities of H-NMR and C-NMR 13C has only about 1.1% natural abundance (of carbon atoms) 12C does not exhibit NMR behaviour (nuclear spin, I = 0) As a result, 13C is about 400 times less sensitive than H nucleus to the NMR phenomena Due to low abundance, we do not usually see 13C-13C coupling Chemical shift range is normally 0 to 220 ppm