Unusual anisotropic effects from 1,3-dipolar cycloadducts of 4-azidomethyl coumarins
作者:Raviraj A. Kusanur、Manohar V. Kulkarni、Geetha M. Kulkarni、Susanta K. Nayak、Tayur N. Guru Row、Kilivelu Ganesan、Chung-Ming Sun
DOI:10.1002/jhet.273
日期:——
acetone to give 4-azidomethylcoumarins (), which underwent 1,3-dipolar cycloaddition with acetylenic dipolarophiles to give triazoles (). These triazoles () have been found to exhibit interesting variations in the chemical shifts of C3H and C4-methylene protons. Protonation studies indicate that the shielding effect of the C3H of coumarin is due to π-electrons of the triazole ring, further supported