Addition of CrCl2 to the dinuclear synthon MoW(dpa)4 yields a regioselectively formed heterotrimetallic Mo![[quadruple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e003.gif)
W⋯Cr chain; computational studies suggest that the polarization of the MoW quadruple bond partially accounts for this unexpected selectivity.
![Graphical abstract: Remarkable regioselectivity in the preparation of the first heterotrimetallic Mo [[quadruple bond, length as m-dash]] W⋯Cr chain](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=B907402C&imageInfo.ImageIdentifier.Year=2009)
![[quadruple bond, length as m-dash]](https://www.rsc.org/images/entities/h2_char_e003.gif)
W⋯Cr chain
M. Nippe, G. H. Timmer and J. F. Berry, Chem. Commun., 2009, 4357 DOI: 10.1039/B907402C
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