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Various experimental methods have been developed to unequivocally identify vicinal neighbor carbon atoms. Variants of the HMBC experiment intended for this purpose have included 2J3J‐HMBC and H2BC. The 1,1‐ADEQUATE experiment, in contrast, was developed to accomplish the same goal but relies on the 1JCC coupling between a proton–carbon resonant pair and the adjacent neighbor carbon. Hence, 1,1‐ADEQUATE...
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