HETCOR
From NMR Wiki
HETCOR is a 2D NMR experiment where two different types of nucleus are correlated through single bond spin-spin couplings.
Chemical shift of one nucleus - heteronucleus or X-nucleus, usually 13C, is detected in the directly measured dimension, while chemical shift of second nucleus, usually 1H is recorded in the indirect dimension.
Today HETCOR is used occasionally, as the more sensitive HSQC experiment is giving similar information.
