An unusual substituent effect in a cycloaddition of an azolium ylide 1,3-dipole: An inverted V-shaped hammett plot
作者:Richard N. Butler、Denise C. Grogan、Luke A. Burke
DOI:10.1002/jhet.5570340631
日期:1997.11
An unusual inverted V-shaped Hammett plot has been observed for substituent effects at the N-terminus of 1,2,3-triazolium-1-imide 1,3-dipoles in cycloaddition reactions. Theoretical studies (3-21G and 6-31G) suggest strong resonance interactions separately stabilizing both ends of the dipole.
对于在环加成反应中的1,2,3-三唑-1-酰亚胺1,3-偶极的N-末端的取代基效应,观察到一个不寻常的倒V形Hammett图。理论研究(3-21G和6-31G)表明,强烈的共振相互作用分别稳定了偶极子的两端。