Py. Chavant et Y. Vallee, FIRST EXAMPLE OF THE [4-CYCLOADDITION OF A THIENIUM CATION GENERATED BY THE PUMMERER REACTION(2(+)]), Journal of chemical research. Synopses, (5), 1995, pp. 204-205
A stable thienium ion was prepared under the conditions of the Pummere
r rearrangement; H-1 and C-13 NMR analysis as well as trapping by a 1,
3-diene provided insight into its structure.