Abstract
A comparative study is presented between the NMR techniques of two-dimensional heteronuclear correlation (HETCOR) with optimal delay times, HETCOR with the inclusion of a BIRD pulse sequence in the middle of t 1, and of one-dimensional selective population inversion (SPI), all of which are utilized in establishing connectivities between carbon and proton nuclei over more than one bond for molecular-structure determinations. Some of the connectivities observed in salicylaldehyde with the SPI experiment could not be detected with long-range HETCOR. Various aspects of the most appropriate values to be used for the delay times in long-range HETCOR are discussed, and the absence of any long-range (C,H) connectivities is reasoned. SPI is the preferred technique for the estimation of the magnitudes of >1 J(C,H).
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