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DOI: 10.1055/sos-SD-046-00090

Gandon, V.; Thorimbert, S.; Malacria, M.Science of Synthesis, (200946183.

As mentioned in Section, alkynes can be coupled with low-valent bis(η5-cyclopentadienyl)zirconium(II) Zr(Cp)2 sources such as the zirconocene 8 and, using heteroatom dihalides (EX2), an exchange between the bis(η5-cyclopentadienyl)zirconium(II) fragment of the resulting zirconacyclopentadienes 34 and the heteroatom (E) allows the construction of various five-membered heterocycles 35 {Scheme 13; see also Science of Synthesis, Vol. 2 [Compounds of Groups 73 (Mn···, Cr···, V···, Ti···, Sc···, La···, Ac···) (Section]}.[‌26‌,‌44‌]

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