Abstract
Two known spin randomization techniques, which might be used for separating a methylene (CH 2)/quatemary (q) 13C subspectrum into separate CH 2 and q subspectra, are compared. Both techniques utilise the heteronuclear scalar coupling interaction between the carbon and directly bonded proton spins. However, the first technique involves randomization of the 13C spins in the transverse plane of the rotating reference frame as a result of off resonance 1H decoupling, whereas the second technique involves randomization of the 1H spins in three dimensions by a powerful noise-modulated pulse. The latter method is superior in that it is much less sensitive to the nonequivalence of methylen protons.
Published Version
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