Nitrogen bridgehead compounds. Part 35. Structures of α??formyl??2, 3??polymethylene??3, 4??dihydroquinazolin??4??ones

…, M Pongor??Csákvári, Z Mészáros…

Index: Horvath, Agnes; Hermecz, Istvan; Pongor-Csakvari, Marianna; Meszaros, Zoltan; Koekoesi, Jozsef; et al. Journal of Heterocyclic Chemistry, 1984 , vol. 21, p. 219 - 224

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Citation Number: 13

Abstract

Abstract The structures of the title compounds bearing a five-, six-or seven-membered A ring have been investigated by uv and 1 H and 13 C nmr spectroscopy. The imine-enol-enamine (I-II-III) tautomerism of these compounds depends greatly on the ring size. A significant solvent-dependence is observed only for the five-membered-ring compounds 1 and 2, which in ethanolic solution exist predominantly in the imine form I, and in chloroform solution in ...