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Double carbonylation of zirconocene-alkyne complexes.

Chemical communications (Cambridge, England) (2005-05-12)
Shizue Mito, Tamotsu Takahashi
PMID15886782
ABSTRACT

Zirconocene-alkyne complexes prepared from Cp2ZrBu2, phosphines and alkynes reacted with CO to give double carbonylation products, 4-hydroxycyclobuten-1-one derivatives after hydrolysis.