Abstract
Two-dimensional correlation spectroscopy with double-quantum filtration (DQCOSY) is now widely used by NMR spectroscopists because it facilitates examination of cros peaks close to the diagonal (1, 2). For a coupled two-spin system, the double-quantum-filtered spectrum resembles the conventional COSY spectrum except that the diagonal peaks are in the (antiphase) absorption mode and responses from uncoupled spins have been suppressed
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