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Structural evidence for the existence of a ‘vinylogous’ anomeric effect is presented for a series of 4H-4-benzotriazolyl-2,6-diarylpyrans 1a,b and for their benzo-fused derivatives 2–5 and nitrogen analogue 6. X-Ray crystal structure analyses reveal changes in the geometry of the central ring and exocyclic C–N bond, which are discussed in terms of an interaction of the benzotriazole fragment with...
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