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N-Methyl-, N-ethyl-, N-(n-propyl)-, N-(iso-propyl)- and N-phenyl-2-arylimidazolidines proved to be ring-chain tautomeric mixtures in CDCl 3 . The ratios of the open and ring forms in the tautomeric equilibria of these compounds is described by the equation log K X = ρσ + + log K X-H , used earlier for the ring-chain equilibria of saturated 2-aryl-1,3-O,N-heterocycles...
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