SELECTION OF NON-PROTONATED CARBON RESONANCES IN SOLID-STATE NUCLEAR MAGNETIC-RESONANCE

Procedures that simplify NMR spectra are important when studying complex molecules, especially when resonance assignments result from the physical basis of a selection process. Among the most useful spectroscopic techniques of high resolution,13C NMR of liquids is the application of weak modulated proton decoupling to selectively broaden those resonances from carbons with directly bonded protons;1 additional manipulations23 result in a carbon spectrum with narrow lines from only the nonprotonated carbons. This communication describes a method for obtaining the analogous nonprotonated carbon spectrum for solid samples where the signals from carbons with attached protons are suppressed. © 1979, American Chemical Society. All rights reserved.