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Pyridinium ylides are formed by deprotonation of the 2- and 6-positions of 3-substituted 1-methylpyridinium ions in D2O buffer solutions at 75·0° in reactions catalysed by deuterioxide ion. The reactivity of the 2-position was determined for 10 substituted ions; eight ions gave kinetic results for the 6-position. Dual substituent parameter equations employing inductive and resonance effects correlate rate constants very well.
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Zoltewicz et al. (1974) studied this question.
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