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Host–guest complexes of cucurbit[n=5–8]uril and some examples of ortho substituted pyridines or aminopyridines were examined by 1H NMR spectroscopy. Portal binding of two ortho aminopyridine free bases, by cucurbit[5]uril, was observed in 1H NMR spectra. Combined cavity and portal binding in cucurbit[6]uril were observed for both the free base 2-aminomethylpyridine, ampy, the HCl salt, ampy·1HCl,...
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