01753nab a2200265 i 4500 publ30979 20250408133824.0 250207s2003 hu o 000 eng d 1224-9513 3258704 mtmt SZTE Publicatio Repozitórium hun eng Szatmári István Substituent effects in the ring-chain tautomerism of 1-aryl-2,3-dihydro-1H-naphth[1,2-e][1,3]oxazines [elektronikus dokumentum] / Szatmári István 2003 175-182 ANNALS OF WEST UNIVERSITY OF TIMISOARA-SERIES CHEMISTRY 12 No. 3 The condensation of Betti base analog aminonaphthols with substituted benzaldehydes or aliph. aldehydes led to 1,3-diaryl-2,3-dihydro-1H-naphth[1,2e][1,3]oxazines (16-22) and 3-alkyl-1-aryl-2,3-dihydro-1H-naphth[1,2-e][1,3]oxazines (23-29), which proved to be three-component (r1-o-r2, 16-22) or two-component (r1-r2, 23-29) tautomeric mixts. in CDCl3 at 300 K. The electronic effects of the 3-aryl or 3-alkyl groups on the tautomeric ratios could be described by the equation log KX = ρσ+ + log KX=H (16-22) and log KR = 7.88Va + 0.55 (23-29) resp. Study of the influence of aryl substituents at position 1 indicated that in the trans form a stereoelectronic effect is present; this was supported by dual substituent parameter treatment of the 13C chem. shift changes induced by Ph substituents. [on SciFinder(R)] Farmakológia és gyógyszerészet Martinek Tamás aut Lázár László aut Koch Andreas aut Kleinpeter Erich aut Fülöp Ferenc aut http://publicatio.bibl.u-szeged.hu/30979/1/aok_klny_326_03.pdf Dokumentum-elérés