Abstract
This chapter describes a collection of nuclear magnetic resonance (NMR) techniques that aim to establish correlations between coupled nuclei of the same type, known as homonuclear shift correlations. It includes a variety of correlation spectroscopy (COSY) experiments, the most widespread implementation of this class of experiments that is typically applied to protons, including the common magnitude-mode COSY, the double-quantum filtered COSY and a long-range optimised COSY variant. It develops this theme by considering the total correlation spectroscopy (TOCSY) experiment used to correlate protons existing within the same spin system. It then considers methods for correlating more dilute nuclei such as carbon-13, through use of the INADEQUATE (Incredible Natural Abundance Double-Quantum Transfer Experiment) techniques and concludes with the more sensitive proton-detected variants of this, known as ADEQUATE (adequate sensitivity double-quantum spectroscopy). For all experiments, details on their implementation and interpretation are given throughout.
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