THE SYNTHESIS OF SOME CHROMANS VIA o-QUINONE-METHIDE INTERMEDIATES

The Synthesis of Some Novel Substituted Benzochromene Derivatives

“…), respectively as expected. The proton-decoupled 13 C NMR spectrum of 5 showed 16 distinct resonances in agreement with proposed structure.…”

“…In the 1 H NMR spectrum of 9, the methine proton appears at δ = 5.19 ppm as a triplet (J = 2.86 Hz). In the 13 C NMR spectra of 9 the methine carbon signal at δ 97.5 ppm and the other16 resonances supported the proposed structure.…”

“…The structure of 5 was established on the basis of its elemental analyses, UV, 1 H and 13 C NMR and IR spectral data. Its 1 H NMR spectrum showed two singlets identified as benzylic (CH 2 Ph) (δ = 3.52 ppm) and -CH 2 N (δ = 3.95 ppm) protons.…”

“…The structures of 7a, 7b and 7c were determined on the basis of spectral data ( 1 H and 13 C NMR, IR, UV and elemental analyses) and compared with literature data. 11,12.16,17 All findings were in good agreement with the proposed structures.…”

“…9 Similar chromene derivatives have been obtained from o-quinonemethides with isobutylene, styrene, and 1,1-diphenylethylene. 10 Bilgiç et al, 11 Yalçınkaya et al, 12 and Büyükkıdan et al 13 have also synthesised derivatives of chromene and benzochromenes using substituted (Cl, CH 3 ) styrenes by the same method.…”