Reduction of the dihalogeno complexes RuCl,(PPh,), and NiBr,L, (L = tertiary phosphine) with sodium hydride in MeCN in the presence of tetrafluoroethylene gives complexes containing five-membered MC,F8 rings. 1,2-Dihydrotetrafluoroethane is a by-product of these syntheses, especially when hydrogen is added. The M--C bonds of the metalla-perfluorocyclopentane complexes are remarkably stable against hydrogenolysis.
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