120154-44-1Relevant articles and documents
Formation and ring expansion of germaplatinacycles via dehydrogenative Ge-Ge and Ge-Pt bond-forming reactions
Tanabe, Makoto,Hanzawa, Masaya,Ishikawa, Naoko,Osakada, Kohtaro
, p. 6014 - 6019 (2009)
The bis(germyl)platinum complex [Pt(GeHPh2)2(dmpe)] (1) (dmpe= l,2-bis(dimethylphosphino)ethane) reacts with a small excess Of H2GePh2 at 90 °C to produce four-membered germaplatinacycle [Pt(GePh2GePh2GePh2)(dmpe)] (2). Further reaction of 2 with excess H2GePh2 at 90 °C forms tetragermaplatinacyclopentane [Pt(GePh2GePh 2GePh2GePh2)(dmpe)] (3), while 3 is obtained also by the direct reaction of excess H2GePh2 with 1 for a prolonged period. Complexes 1-3 were characterized by X-ray crystallography and NMR spectroscopy. Germaplatinacycles 2 and 3 react with H3GePh to cause cleavage of the Pt-Ge bonds and formation of the oligogermanes H(GePh 2)3H and H(GePh2)4H respectively.
New (diarylgermyl)lithiums
Castel,Riviere,Satge,Ko
, p. 205 - 210 (2008/10/08)
The new (diarylgermyl)lithiums R2GeHLi (2; R = phenyl, mesityl) were prepared in good yields by hydrogermolysis reactions of tert-butyllithium in THF. The stability of compounds 2 depends on the nature of the R group and the solvent. For R = Ph, in the presence of an amine (Et3N or Et2NMe), the same reaction leads to the formation of the polygermanes H(GePh2)nH (n = 2-4). The characterization of compounds 2 by IR and 1H and 13C NMR spectroscopy and their complexation with a crown ether are also reported. They are characterized by deuterolysis and alkylation reaction (with MeI and Me2SO4). Their germylation reactions with Ge-Cl reagents constitute a convenient way for synthesizing organo-hydropolygermanes. Compounds 2 also react with acyl chlorides to give new germyl ketones, R2HGeCOR′, and the unexpectedly stable β-germyl diketone Ph2Ge(COMes)2.
SYNTHESE DE COMPOSES A LIAISON MIVB-MERCURE. PRECURSEURS D'ESPECES MONOVALENTES (GERMYNES), ET BIVALENTES (GERMYLENES), DE RADICAUX CENTROMETALLES ET D'INTERMEDIAIRES
Riviere, P.,Castel, A.,Satge, J.
, p. 351 - 367 (2007/10/02)
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.
