Though not boranes, (*) nonclassical depictions of these compounds give them bridged three-center two-electron bonds.
RM Coates names an unusual polycyclic example of these compounds derived from pentacyclononane. Multiple reactions that form the same one of these compounds show memory effects. These compounds have a delta-sub-sigma value in carbon NMR of up to 400 ppm. Saul Winstein proved anchimeric assistance is stereoselective in forming these compounds, leading to his debate with Herb Brown about 2-norbornene. Though not boranes, (*) nonclassical depictions of these compounds give them bridged three-center two-electron bonds. George Olah showed that stable media for these compounds includes antimony pentafluoride. These compounds, which undergo spontaneous methanide migrations, are formed as intermediates in isobutylene polymerization, in Friedel-Crafts alkylation, and in SN1 reactions. For 10 points, name these intermediates in which carbon has a positive charge.
RM Coates names an unusual polycyclic example of these compounds derived from pentacyclononane.
carbocations [or carbonium ions; or carbenium ions; prompt on ions or cations]