- Synthesis of Bis(pentafluoroethyl)germanes
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The chemistry of bis(pentafluoroethyl)germanes (C2F5)2GeX2 is presented. The synthesis of such species requires Br2GePh2, wherein the phenyl substituents function as suitable protecting groups. After treatment with two equivalents of LiC2F5, (C2F5)2GePh2 is produced. The replacement of the phenyl rings is smoothly effected by gaseous HBr or HCl in the presence of a Lewis acidic catalyst. The trigermoxane [(C2F5)2GeO]3 results from the reaction of (C2F5)2GeBr2 with Ag2CO3. Its crystalline 1,10-phenanthroline adduct was fully characterised by X-ray diffraction. The combination of (C2F5)2GeBr2 with Bu3SnH gave rise to the formation of (C2F5)2GeH2.
- Pelzer, Stefanie,Neumann, Beate,Stammler, Hans-Georg,Ignat'ev, Nikolai,Hoge, Berthold
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p. 4758 - 4763
(2016/04/05)
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- PdCl2 and NiCl2-catalyzed hydrogen-halogen exchange for the convenient preparation of bromo- and iodosilanes and germanes
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Bromination and iodination of hydrosilanes and germanes were studied. Treatment of hydrosilanes with an excess of ethyl, propyl, or allyl bromide in the presence of a catalytic amount of PdCl2 or NiCl2 gave bromosilanes in good to high yield by hydrogen-halogen exchange. By using methyl, propyl, or allyl iodide as the iodine source, similar iodination of hydrosilanes was readily performed. Halogenation of hydrogermanes also proceeded by similar treatment.
- Iwata, Arihiro,Toyoshima, Yutaka,Hayashida, Tsuyoshi,Ochi, Takahiko,Kunai, Atsutaka,Ohshita, Joji
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- Microwave-assisted Lewis acid catalysis: Application to the synthesis of alkyl- or arylhalogermanes
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Under microwave irradiation, alkyl- or arylhalogermanes RnGeX4-n (R = Et, Bu, Ph; X = Cl, Br) are obtained by redistribution reactions of R4Ge with GeX4. These experimental conditions permit the synthesis of such compounds in good yield in a few minutes at atmospheric pressure. The direct Friedel-Crafts germylation of benzene and toluene by germanium tetrachloride also has been performed, but yields were low.
- Laurent, Régis,Laporterie, André,Dubac, Jacques,Berlan, Jacques
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p. 2493 - 2495
(2008/10/08)
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- Chemistry of Germanium Atoms. II. Reactions of Thermally Evaporated Germanium Vapor with Organic Halides
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Thermally generated germanium atoms were found to react with organic halides by insertion into carbon-halogen bonds.The resulting germylenes abstracted halogens from organic halides to form trihalogermyl derivatives.Tetrahalogermanes were also formed by t
- Mochida, Kunio,Tashiro, Kumiko,Yoshida, Yasuhiro,Mizuno, Yasuhisa
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p. 1247 - 1250
(2007/10/02)
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- SYNTHESE DE COMPOSES A LIAISON MIVB-MERCURE. PRECURSEURS D'ESPECES MONOVALENTES (GERMYNES), ET BIVALENTES (GERMYLENES), DE RADICAUX CENTROMETALLES ET D'INTERMEDIAIRES
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Polynuclear germyl-mercury compounds are obtained from the reaction of organohydrogermanes PhnGeH4-n or digermanes Ph2nGe2H4-n (n = 1, 2) with dialkylmercury R2Hg.Di- or tri-mercurated geminal polygermates thus synthesized generally present a low stability and undergo thermal- or photodecompositions leading to the corresponding monovalent (germynes), divalent (germylenes) or, trivalent (germanium centered radicals) species and also to intermediate biradicals which could be considered as limit forms of germanium doubly-bonded compounds .Such intermediates have been chemically and spectroscopically characterized.Extension of these reactions to the silicon analogs met with difficulties, and thus previously observed differences between silicon and germanium chemistry were confirmed.
- Riviere, P.,Castel, A.,Satge, J.
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p. 351 - 367
(2007/10/02)
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