Ruthenium oxyfluorides

In its chemical properties, the oxyfluoride behaves as a derivative of five-positive platinum. Potassium hexafluoroplatinatc(v) (Found F, 32-0. KPtF, requires F, 32-7%) is formed when the oxyfluoride vapour is passed over hot potassium fluoride and when potassium fluoride is mixed with the oxy-fluoridc in iodine pentafluoride solution. Potassium hexafluoroplatinatc(v) has a rhombohedral unit cell with a = 4-97 A, a = 97-5°, and is isomorphous with its ruthenium, osmium, and iridium analogues. Dissolution of the oxyfluoride in chlorine trifluoride and in iodine p>entafluoride yields 1 1 platinum penta-fluoridc-solvent adducts. 

Other oxidants like thallium(III) oxide, vanadium(V) oxyfluoride, palladium ) acetate, and ruthenium(IV) tetrakis(trifluoracetate) have been developed as powerful tools for the intramolecular biaryl coupling reaction [7,93,113]. Nevertheless, DDQ is still one of the most versatile reagents in oxidative coupling reactions (see Scheme 14 and 29 [82,114]). The highly strained dioxa[8](2,7)pyrenophane (65), portraying an overall curvature of nearly 90° for the pyrene subunit, was finally obtained from the mefa-cyclophanediene (66) by dehydrogenation with DDQ in refluxing benzene in 67% yield [114]. 

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