SF6 as a Selective and Reactive Fluorinating Agent for Low-Valent Transition Metal Complexes
摘要:
SF6 has been found to react readily with vanadocene, yielding V(C5H5)(2)F, while reactions with decamethylchromocene can lead to a number of products, depending on conditions. Among the products can be included Cr(C5Me5)F-2(dmap) (dmap = p-dimethylaminopyridine), Cr(C5Me5)(2)(+)[Cr-2(C5Me5)(2)F-5](-), and Cr-8(C5Me5)(6)F-18. Each of these reactions is likely to occur via the equivalent of an inner-sphere electron-transfer process. An even more rapid reaction was observed with the 19-electron Fe(C5H5)[1,3,5-C6H3(t-C4H9)(3)] complex, leading to various salts of the expected 18-electron cation. In these cases, the reactions are likely to be analogous to an outer-sphere electron transfer, presumably leading initially to a "naked" fluoride ion. Structural characterization of each of these species has been obtained through X-ray diffraction studies.