Abstract
A new type of ring-chain tautomerism consisting in the reversible transformation of 4-(5-)haloalkanecarboxylic acid dialkylamides into dialkyl(tetrahydrofuran-2-ylidene)- and dialkyl(tetrahydropyran-2-ylidene)ammonium halides, respectively, was found and studied by 1H NMR spectroscopy.
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Zlokazov, M.V., Lozanova, A.V. & Veselovsky, V.V. New type of ring-chain tautomerism. Direct evidence from 1H NMR spectroscopy. Russian Chemical Bulletin 53, 547–550 (2004). https://doi.org/10.1023/B:RUCB.0000035634.33295.0c
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DOI: https://doi.org/10.1023/B:RUCB.0000035634.33295.0c