68816-03-5Relevant academic research and scientific papers
Low-temperature Syntheses of Polysilanes and Polygermanes in Diethyl Ether
Cragg, R. Harry,Jones, Richard G.,Swain, Anthony C.,Webb, Samantha J.
, p. 1147 - 1148 (1990)
Both soluble and insoluble polysilanes and an insoluble polygermane have been prepared in high yield and at moderate temperature from the interactions of alkylaryl-, diaryl-, and dialkyl-dichlorosilanes and diphenyldichlorogermane with sodium sand in the
Electrochemical synthesis of polygermanes
Okano,Takeda,Toriumi,Hamano
, p. 659 - 666 (1998)
Five dialkyl-substituted and three phenyl substituted polygermanes were electrochemically synthesized. Among them, dibutyl-, dipentyl-, and dihexyl-substituted polygermanes gave the best synthetic results, i.e., relatively high yields (25-45%), high curre
Synthesis, absorption characteristics and some reactions of polygermanes
Mochida, Kunio,Chiba, Hiromi
, p. 45 - 54 (1994)
A number of high molecular weight polygermanes were prepared by an improvement on Wurtz coupling reactions of dichlorogermanes and sodium metal, and by a method using diiodogermylene and Grignard reagents (or organolithiums).Most of the polygermanes thus prepared showed a narrow molecular distribution containing molecular weights 103-104.In solution, the polygermanes showed characteristic electronic absorption bands at 300-350 nm and were strongly thermochromic for alkyl-substituted derivatives.Photolysis of the polygermanes proceeded by both contraction of the chain with loss of diorganogermylenes and homolytic scission of the germanium-germanium ? bond. Key words: Germanium; Polygermane; Photochemistry
Synthesis of Polygermanes by Ligand Substitution Polymerization of the 1,4-Dioxane Complex of Germanium Dichloride with Organolithium Compounds
Kobayashi, Shiro,Cao, Shaokui
, p. 1385 - 1388 (1993)
Higher molecular wight polygermanes were synthesized by a ligand substitution polymerization of the 1,4-dioxane complex of germanium dichloride with organolithium compounds at a lower reaction temperature.Different from conventional Wurtz-type coupling reaction, the present polymerization gives rise much higher yields of polygermanes.
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.
Photochemistry of aryl-substituted trigermanes. Generation and mechanism of formation of germylenes
Mochida, Kunio,Yoneda, Isao,Wakasa, Masanobu
, p. 53 - 62 (2007/10/02)
Photochemical reactions of aryl-substituted trigermanes have studied by trapping experiments, matrix isolation, and laser flash-photolysis techniques.Photolysis of the phenylated trigermanes involved both the simple extrusion of germylenes and the formati
Electronic absorption spectra of diorganogermylenes in matrices: Formation of diorganogermylene complexes with heteroatom-containing substrates
Ando, Wataru,Itoh, Hiroyuki,Tsumuraya, Takeshi
, p. 2759 - 2766 (2008/10/08)
Diorganogermylenes were generated in hydrocarbon matrices at 77 K by the photolysis of 7-germanorbornadienes 1a-e or bis(trimethylsilyl)germanes 2a-g. The germylenes show electronic absorption bands at 420-558 nm. The germylenes react with heteroatom-containing substrates (R2O, R2S, R3P, R3N, RCl, and ROH) to form adducts, which show characteristic absorption bands at shorter wavelengths than those of germylenes.
Photochemistry of aryl-substituted trigermanes
Wakasa, Masanobu,Yoneda, Isao,Mochida, Kunio
, p. C1 - C5 (2007/10/02)
The photolysis of phenyl-substituted trigermanes affords digermanes and germenylenes.Trapping experiments, matrix isolation, and laser-photolysis studies indicate that the photoreaction of these compounds involves both the extrusion of germylenes and the
Matrix Isolation and Ultraviolet Spectra of Germylenes
Ando, Wataru,Tsumuraya, Takeshi,Sekiguchi, Akira
, p. 317 - 318 (2007/10/02)
Some organogernylenes were isolated in a hydrocarbon matrix at low temperature by the photolysis of 7-germanoboradienes or bis(trimethylsilyl)germanes.The germylenes show electronic absorption bands at 420-560 nm.
DIOXA- ET DITHIAGERMOLES: SYNTHESE ET QUELQUES ASPECTS DE LEUR REACTIVITE
Lavayssiere, Helene,Dousse, Gabriel
, p. C17 - C22 (2007/10/02)
Synthetic methods to obtain new dioxagermoles and dithiagermoles are described.Dioxagermoles decompose to germylenes and α-diketone on thermolysis, and formation of cyclotrigermathianes (R2GeS)3 from dithiagermoles is observed at about 200 deg C via a R2Ge=S intermediate.Exchange reactions between dioxagermoles or dithiagermoles and thiophosgene give a dioxolethione and a dithiolethione, respectively.In the exchange reaction between dithia- and dioxa-germoles with GeCl2*dioxane, formation of new stable unsaturated germylenes is observed.
