- New linked di-germanocenes and di-stannocenes
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New bridged di-germanocenes and di-stannocenes 2 have been synthesized from a reaction between (pentamethylcyclopentadienyl)metal chloride and the dilithium salts of the corresponding linked cyclopentadienyl ligands (spacer: phenylene, biphenylene, thiophene) in good yields. These di-metallocenes react easily with catechol giving preferentially the substitution reaction. With iodine or with metal 14 dichloride (M = Ge, Sn), the oxidative products are unstable and rapidly loose the linked cyclopentadienyl ligand. Starting from SnCl2, the ionic half-sandwich compound [Cp*Ge][SnCl3] 8, so obtained, was characterized by X-ray diffraction analysis which reveals a polymeric form in the solid state. The reaction of the di-germanocenes with o-quinone leads to the expected cycloadducts, stable in the case of permethylated compounds. An unusual single electron transfer reaction takes place with [Cp2Fe][BF4] and the transient cation radical rapidly gives [Cp*Ge][BF4]. Mass spectra measurements and electrochemistry study confirm the weak stability of this cationic species.
- Rouzaud,Joudat,Castel,Delpech,Rivière,Gornitzka,Manriquez,Chavez
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- Cycloaddition of Germylenes to 3,5-Di-t-butylorthoquinone
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The germylenes X2Ge, RGeX and R2Ge (X= halogen, OR; R= alkyl or aryl) react at room temperature with 3,5-di-t-butyl orthoquinone by regioselective cycloaddition.The corresponding substituted 2-germa-1,3-dioxolans are formed similarly in good yields, but t
- Riviere, Pierre,Castel, Annie,Satge, Jacques,Guyot, Daniel
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p. 157 - 164
(2007/10/02)
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