Mueller,E., Chemische Berichte, 1976, vol. 109, p. 3793 - 3803
作者:Mueller,E.
DOI:——
日期:——
Effect of a Methoxy Substituent on the Vinylcyclobutane Carbon Migration
作者:Phyllis A. Leber、Celina C. Lasota、Neil A. Strotman、Gloria S. Yen
DOI:10.1021/jo0621017
日期:2007.2.1
Over the temperature range 250-300 degrees C, 8-exo-methoxybicyclo[4.2.0]oct-2-ene (1a) undergoes a [1,3] sigmatropic rearrangement to 5-exo- and 5-endo-methoxybicyclo[2.2.2]oct-2-enes, 2a and 2b, respectively, with a clear preference for the si product: si/sr = 3.2. Both 1a and its 8-endo epimer 1b experience appreciable epimerization and fragmentation. A long-lived intermediate with weakly interacting diradical centers, one of which is stabilized by a methoxy substituent, can account for all such observations.
The Bicyclo[2.2.2]octyl Carbene System as a Probe for Migratory Aptitudes of Hydrogen to Carbenic Centers
作者:Xavier Creary、Mark A. Butchko
DOI:10.1021/ja002407+
日期:2001.2.1
A series of tosylhydrazone derivatives of exo-6-substituted bicylo[2.2.2]octan-2-ones have been prepared. Thermal decomposition of the sodiumsalts of these tosylhydrazones gives carbene-derived products from 1,3-migration of either the C6 hydrogen (perturbed) or the C7 hydrogen (unperturbed), along with smaller amounts of alkenes derived from 1,2-hydrogen migration. The exo-6-substituent strongly