Reactions of titana- and zircona-cyclopentadienes with alkynes

Abstract

Expanded metallacycles of up to 17 members have been obtained from insertion reactions of acetylenic molecules into the M–C bonds of various substituted dicyclopentadienyl-titana- and -zircona-cyclopentadienes; in one case, a zirconacyclononatetraene with mixed phenyl and methyl substituents was isolated.