Science of Synthesis

Gandon, V.; Thorimbert, S.; Malacria, M., Science of Synthesis, (2009) 46, 211.

In a similar type of reaction to that undergone by simple alkynes (see Section ‌46.5.1.2.2‌) acyclic diynes ‌137‌ react with zirconium(II) sources “Zr(Cp)2” to produce bicyclic zirconacyclopentadienes ‌138‌, which may be demetalated by treatment with hydrochloric acid to afford E,E-exocyclic cycloalkadienes ‌139‌, containing four- to seven-membered rings, in good yields (‌Scheme 46‌).[‌120‌]

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References