Thermal Rearrangement of 7-Methylbicyclo[3.2.0]hept-2-ene: An Experimental Probe of the Extent of Orbital Symmetry Control in the [1,3] Sigmatropic Rearrangement
作者:Jared D. Bender、Phyllis A. Leber、Ruel R. Lirio、Randall S. Smith
DOI:10.1021/jo9918899
日期:2000.8.1
gas-phase thermalrearrangement of exo-7-methylbicyclo[3.2.0]hept-2-ene yields almost exclusively 5-methylnorbornene products. Inversion (i) of configuration dominates this [1,3] sigmatropic shift although some retention (r) is also observed. Because the [1,3] migration can only occur suprafacially (s) in this geometrically constrained system, the si/sr ratio of 7 observed for the migration of C7 in