142083-79-2Relevant academic research and scientific papers
Protonation at the aromatic ring vs at the carbonyl group of lanthanide-diaryl ketone dianion species by aryl alcohols. Formation, structural characterization, and reactivity of lanthanide aryloxide, mixed aryloxide/alkoxide, and aryloxide/enolate complexes
Yoshimura,Hou,Wakatsuki
, p. 5382 - 5392 (2008/10/09)
Reaction of the ytterbium-benzophenone dianion complex (1), which was formed by reaction of Yb metal with benzophenone in THF/HMPA, with 2,6-di-tert-butyl-4-methylphenol, yielded the ytterbium(II) aryloxide complex Yb(OAr)2(HMPA)2 (2, Ar= C6H2 -tBu2-2,6-Me-4) as a major product (80%) and the ytterbium(III) enolate complex (3) as a minor one (ca. 5% yield). The mechanisms of these reactions are discussed. X-ray crystallographic studies reveal that 3, 4a, and 7b are isostructural, and so are 5a and 6. The central metal ions in these complexes are all five-coordinated in a trigonal bipyramid form (highly distorted in the case of 5a and 6) with two HMPA ligands at the apical and three anionic oxygen ligands at the equatorial positions.
Novel Crystal Structure of Ytterbium(II)-Benzophenone Dianione Complex and its Reaction with 2,6-Di-tert-butyl-4-methylphenol
Hou, Zhaomin,Yamazaki, Hiroshi,Kobayashi, Kimiko,Fujiwara, Yuzo,Taniguchi, Hiroshi
, p. 722 - 724 (2007/10/02)
Treatment of 1 equiv. of Yb metal with benzophenone in tetrahydrofuran-hexamethylphosphoramide (hmpa) gives a YbII-benzophenone dianion complex, 2> 1 which on treatment with 2,6-di-tert-butyl-4-methylphenol produces t2-2,6-Me-4)2(hmpa)2> 2; both 1 and 2 are structurally characterized by X-ray crystallography.
