Asymmetric arene-alkene cyclization reactions mediated by a chiral ele
ctrophilic organoselenium reagent afforded substituted carbocyclic der
ivatives with high diastereoselectivities. It was also found that beta
-methoxyselenides are good precursors of seleniranium ions when treate
d with strong acids. (C) 1998 Elsevier Science Ltd. All rights reserve
d.