Cyclization of an adamantylidene-based olefin induced by aminium hexachloro
antimonate salts under a nitrogen atmosphere revealed that oxidative activa
tion by these salts may be due to SbCl6, which in combination with an oxida
nt counter-ion provides SbCl5 as the true reactive species. (C) 2001 Elsevi
er Science Ltd. All rights reserved.