[1,2,3]Triazolo[4,5-d][1,3,2]thiazaphospholes: a new fused NPS ring system from a cycloaddition–rearrangement sequence with Lawesson’s reagent, a super dipolarophile
作者:Richard N. Butler、Elaine C. McKenna
DOI:10.1039/a706306g
日期:——
A new fused NPS ring system has been obtained from the reaction of substituted 1,2,3-triazolium-1-imide 1,3-dipoles with Lawessonâs reagent
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 unusualinvertedV-shapedHammettplot 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.