Figure 9.42
(a) Generalized multipulse sequence for 1-D or 2-D NMR.
(b) Generation of a 2-D NMR spectrum S( f 1 , f 2 ).(^13) C spectrum (all signals are singlets) and a set of three sub-spectra are generated by variations in the
pulse sequence. Each sub-spectrum shows signals from carbons with only one particular proton
multiplicity, i.e. methyls, methylenes or methines, which enables signals from each of these three to be
identified in the complete spectrum. Quaternary carbons give no sub-spectrum but are easily identified
in the main spectrum once the signals