Co-ordinatively unsaturated tungstacarbonyl species, formed either chemically or photochemically, react with alkynes H–C![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
C–R to give, after solvolysis of presumed vinylidene complexes by R'OH, in the presence of SiO2, the fischer-type carbene complexes (CO)5W![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
C(OR′)(CH2R).
A. Parlier and H. Rudler, J. Chem. Soc., Chem. Commun., 1986, 514 DOI: 10.1039/C39860000514
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