13C-APT (attached proton test) determines 13C chemical shifts and differentiates between Cq, CH, CH2, CH3 groups (positive/negative signals) Ref.: S. Patt, J.N. Shoolery, J. Magn. Reson. 46, 535-539 1982
13C-DEPT (distorsionless enhancement by polarization transfer) determines 13C chemical shifts and differentiates between CH, CH2, CH3 groups (positive/negative signals). The signals of Cq and solvent signals are suppressed. Ref.: M.R. Bendall, D.M. Doddrell, D.T. Pegg, J. Am. Chem. Soc. 103, 4603-4605 1981
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