Abstract
Two trans diynyl ligands are found in ruthenium complex 1, which is prepared from cis-[RuCl2(dppm)2] (dppm = bis(diphenylphosphino)methane) and the appropriate organotin compound accompanied by elimination of Bu3SnCl. Complex 1 is treated with HBF4 · Et2O in methanol to form the salt 2, which contains the first-ever bis(allenylidene)metal unit in its dication. This type of complex is especially interesting in view of the unusual physical properties anticipated for it. \documentclass{article}\pagestyle{empty}\begin{document}$\widehat{\rm PP}$\end{document} = dppm.
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