It is well known that some carbon types (e.g. aryl C) can be underrepresented in cross polarization (CP) 13C NMR spectra and that the alternative direct polarization (DP) technique provides more quantitative spectra (Smernik and Oades, 2000a, b).
It is wellknown that some carbon types (e.g. aryl C) can be underrepresentedin cross polarization (CP) 13C NMR spectra and thatthe alternative direct polarization (DP) technique provides more quantitative spectra (Smernik and Oades, 2000a, b).