Syntheses of organoytterbium(III) compounds by oxidation of dicyclopentadienylytterbium(II). Crystal structure of [η-C5H5)2Yb(O2CC6F5)]2

Organoytterbium(III) complexes [(η-C 5 H 5 ) 2 )YbX] (X = O 2 CMe, O 2 CC 6 F 5 , O 2 CC 5 H 4 N, Cl, Br, I, CCPh, C 6 F 5 , (MeCO) 2 CH, (PhCO) 2 CH) have been synthesized in high yield from [η-C 5 H 5 ) 2 ]Yb(MeOCH 2 ) 2 ] and the corresponding HgX 2 , TlX, AgX 2 or CuX species. An X-ray diffraction study of the pentafluorobenzoate has shown it to be dimeric, with a somewhat unsymmetrical bridging carboxylate.