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377,378 The complexes [Cp2Yb(-OCH2CH2CH2CH2CH3)]2, [Cp2Yb(-OCH2CHTCHCH3)]2, [Cp2Yb{-OCH(CH2)3O}]2, and [Cp2Yb(-OCH2CH2CH(Me)2)]2 were characterized by X-ray crystallography. In all these dimeric structures the ytterbium atom is coordinated by two Cp ligands and two oxygen atoms of alkoxide ligands to form a distorted tetrahedral geometry. The central Yb2O2 metallacycles in these molecules are completely planar. 379 The interaction of Ce(C5H3But2-1,3)3 or LnCp03 (Ln ¼ La, Ce, Nd) with metallic lithium or potassium in DME led to alkoxide complexes [Cp02Ln(-OMe)]2 and [Cp02Nd(-OMe)2Li(DME)].

Of NaCp0 with YbI3(THF)2, which was obtained from Yb metal and an excess of 1,2-diiodoethane in THF (Cp0 ¼ C5H3(SiMe3)2-1,3). 202 Several bis(cyclopentadienyl)iodide complexes with lanthanum, samarium, yttrium, erbium, and lutetium were synthesized by halide exchange reactions between [Cp02Ln(-Cl)]2 and NaI in THF. The starting materials [Cp02Ln(-Cl)]2 were synthesized by treatment of anhydrous LnCl3 with 2 equiv. of Cp0Na in THF. Subsequent treatment of [Cp02Ln(-Cl)]2 with excess of NaI at room temperature produced the organolanthanide iodide complexes Cp02LnI(THF) in 50–69% yield.

The complex CpsDyCl2(THF)2 reacts with 1 equiv. 255 SmCl3 reacted with 3 equiv. of methoxyethylcyclopentadienyl potassium in THF, followed by treatment with trans(Æ)-2,29-[1,2-cyclohexanediylbis(iminomethyl)]diphenole to give the binuclear mono(methoxyethylcyclopentadienyl)samarium complex [5:1-Cp9Sm][(:-OC20H20N2O)]2[5-Cp9Sm] (Cp9 ¼ MeOCH2CH2C5H4) (Scheme 52). 256 The reaction of a 1 : 2 molar ratio of Cp3Pr with diethyl malonate in n-hexane results in the formation of {CpPr[CH(COOC2H5)2][-CH(COOC2H5)2]}2.

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A textbook of inorganic chemistry vol.XI part II Organometalic compounds. Derivatives of Arsenic


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