標題: Unusual Anisotropic Effects from 1,3-Dipolar Cycloadducts of 4-Azidomethyl Coumarins
作者: Kusanur, Raviraj A.
Kulkarni, Manohar V.
Kulkarni, Geetha M.
Nayak, Susanta K.
Row, Tayur N. Guru
Ganesan, Kilivelu
Sun, Chung-Ming
應用化學系
Department of Applied Chemistry
公開日期: 1-一月-2010
摘要: 4-Bromomethylcoumarins (1) reacted with sodium azide in aqueous acetone to give 4-azidomethyl-coumarins (2), which underwent 1,3-dipolar cycloaddition with acetylenic dipolarophiles to give triazoles (3). These triazoles (3) have been found to exhibit interesting variations in the chemical shifts of C(3)-H and C(4)-methylene protons. Protonation studies indicate that the shielding effect of the C(3)-H of coumarin is due to pi-electrons of the triazole ring, further supported by diffraction and computational studies.
URI: http://dx.doi.org/10.1002/jhet.273
http://hdl.handle.net/11536/6282
ISSN: 0022-152X
DOI: 10.1002/jhet.273
期刊: JOURNAL OF HETEROCYCLIC CHEMISTRY
Volume: 47
Issue: 1
起始頁: 91
結束頁: 97
顯示於類別:期刊論文