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SF6 is reactive fluorinator Sulfur hexafluoride (SF6), a gas known for its extreme inertness and extraordinary stability, has now been shown to have promise as a selective fluorinating agent. Richard D. Ernst and coworkers at the University of Utah have discovered that SF6 is quite reactive toward low-valent organometallic compounds of titanium and zirconium at room temperature and even below (J. Am. Chem. Soc. 2005, 127, 11924). And surprisingly, they report, the gas's reactivities "can rival or exceed those of some commonly employed fluorinating agents." For example, when they treated a titanium complex having three different ligands (one of them being a disubstituted cyclopentadienyl, R) with SF6, they produced a cyclic tetrameric complex, [Ti(R)F2]4. The chemists believe that the SF6 reactions leading to oxidation of the metal center occur when one or more of the fluorine atoms coordinate and then transfer to the metal center. They suggest that SF6 may prove useful for preparing compounds "not normally obtained through other reactions." |
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