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Abstract
A novel two-dimensional NMR pulse sequence, H2BC, for long-range correlation of 1H and 13C nuclei is presented. The experiment has several attractive features compared to the widely used HMBC experiment, for example, (a) typically strong enhancement of correlations over two bonds while suppressing those over more bonds, that is, resolving ambiguities in standard HMBC spectra and showing two-bond correlations not present in HMBC spectra, (b) independence of long-range 1H-13C coupling constants, (c) full homo- and heteronuclear decoupling in the indirect dimension and heteronuclear decoupling in the acquisition dimension, (d) pure 2D absorption peak shapes, and (e) a pulse sequence duration significantly shorter than that of HMBC. The experiment is quite complementary to HMBC and does not effect correlations to quaternary carbons that must be obtained by HMBC.
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