Abstract
1. An experimental and theoretical study was made of the accelerating effect of the intramolecular hydrogen bond on the nucleophilic substitution reaction of halopyrimidines. 2. In contrast to the existing literature data, the presence of specific solvation is not a necessary condition for the accelerating effect. 3. The theory was expressed that intrachelate tautomerism is possible in the σ complexes of azines that contain an intramolecular hydrogen bond.
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