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The behaviour of the title compounds, obtained from terephthaldicarboxaldehyde or 1,2-phthaldicarboxaldehyde and certain (non)chiral C-substituted serinols is discussed in terms of ring (chain)-chain (ring) tautomerism (1,4-phenylene derivatives) or formal intramolecular redox isomerisation (1,2-derivatives).
The 1 H, 13 C and 15 N chemical shifts of benzotriazole and its adducts with acetone have been measured. Using dynamic 13 C NMR spectroscopy in the +30/-90 o C range, the barrier to prototropy in benzotriazole has been determined (10.8kcalmol -1 at 294K). The thermodynamic parameters corresponding to the equilibria between benzotriazole...
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