Abstract
Condensation of Betti base analogue amino naphthols with substituted benzaldehydes led to 1,3-diaryl-2,3-dihydro-1 H-naphth[1,2- e][1,3]oxazines ( 3– 9 ) which proved to be three-component (r 1–o–r 2) tautomeric mixtures in CDCl 3 at 300 K. The electronic effects of the 3-aryl groups on the ratios of the ring-chain tautomeric forms at equilibrium could be described by the equation log K X= ρσ ++log K X=H. The value of the intercept was found to be strongly influenced by the steric arrangement of the 1,3-diaryl substituents.
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