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.
A. Famili, M. F. Farona and S. Thanedar, J. Chem. Soc., Chem. Commun., 1983, 435 DOI: 10.1039/C39830000435
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