2D NMR Spectroscopy

2D Heteronuclear J-Resolved 13C NMR

Usefull for determining multiplicity and C-H coupling constants for closely spaced 13C signals.

2D Heteronuclear (H,C)-Correlated NMR Spectroscopy (H,C-COSY or HETCOR)

Correlates 13C signals with 1H signals. Tells you which carbons are attached to which hydrogens. Useful when you can assign a 1H signal but not the 13C signal or vice versa.

2D Homonuclear (H,H)-Correlated NMR (H,H-COSY)

Correlates coupled 1H signals. Tells you all the protons which are coupled to any particular proton. Useful in determining connectivity.

2D INADEQUATE

Correlates coupled 13C signals (13C-13C) Only one bond couplings are detected, so it gives you the connectivity of all the carbons.