Heteroatomic hydrogen-carbon correlation

A more sophisticated methodology that might eventually be used is heteroatomic hydrogen-carbon correlation (HETCOR), which can define deeper correlations in the polymer molecule. Conceivably, this can be used for copolymerizations of complex mixtures with monomers with very different reactivities and functional groups. 

HETCOR (Section 13 19) A 2D NMR technique that correlates the H chemical shift of a proton to the chemical shift of the carbon to which it is attached HETCOR stands for heteronuclear chemical shift correlation Heteroatom (Section 1 7) An atom in an organic molecule that IS neither carbon nor hydrogen Heterocyclic compound (Section 3 15) Cyclic compound in which one or more of the atoms in the nng are elements other than carbon Heterocyclic compounds may or may not be aromatic... 

With more than 100 elements besides carbon in the periodic table (Appendix 2), you might fear that the number of H chemical shift correlations is endless. However, except for a few specialized applications, the most important heteroatoms to which hydrogen finds itself bonded are oxygen and nitrogen. But before we discuss these two specific cases, here is a useful generalization As the electronegativity (Table 6.1) of X increases, both the acidity and chemical shift of a hydrogen bonded directly to X increase. 

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