共查询到20条相似文献,搜索用时 281 毫秒
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Karl Hassler 《Monatshefte für Chemie / Chemical Monthly》1988,119(10):1051-1056
The synthesis and properties of [Ph
2
p-TolSi]2, [Ph
2
p-TolSi]2SiPh
2, [Ph
3
Si]2Si(p-Tol)2, [Ph
2
p-TolSi]2Si(p-Tol)2 and (SiPh
3)2SiH2 are described. The silanes are identified using IR,Ra- and29Si-NMR-spectroscopy. 相似文献
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Trimethylgallium and trimethylindium react with N′,N dimethylacethydrazine and N′,N″,N′″-trimethylacetimidohydrazine, respectively, to form as a first step, monomeric dimethylmetal derivatives with five-membered ring skeletons. These heterocyclic compounds immediately add a further alkylmetal molecule. The 1H NMR, IR and Raman spectra of these compounds are discussed and the results of X-ray structure determinations of two of the adducts are given. 相似文献
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Acyclic and Cyclic Silylhydrazones and Hydrazonylsilanes Dimethylketone-di-tert-butylmethylsilylhydrazone ( 1 ) is obtained in the reaction of the silylhydrazine and dimethylketone by condensation. Di-tert-butyldifluorosilane reacts with lithiated hydrazones to give fluorosilylhydrazones 2–4 , (CMe3)2SiF? NH? N = CRR′, ( 2 : R=Me, R′=CMe3; 3 : R,R′=CHMe2; 4 : R,R′=Ph). The bis(hydrazonyl)silane 5 , (CMe3)2Si(NH? N=CPh2)2, is formed in a molar ratio 1:2. Tris( 6 )- and tetrakis(hydrazonyl)silanes ( 7 ) are obtained from CMe3SiF3 ( 6 ), SiF4 ( 7 ), and lithiated tert-butylmethylketon-hydrazone. The lithium derivatives 8–11 are formed in the reaction of 1–4 with butyllithium. Bis(silyl)hydrazones ( 12–15 ) are the result of the reaction of halogensilanes and the lithium derivatives of 1(8), 2(9) and 3(10); 12 : (CMe3)2SiMe(CMe3SiF2)-N? N=CMe2, 13 : (CMe3)2MeSi(PhSiF2)N? N=CMe2, 14 : (CMe3)2SiF(Me3Si)N? N=C(Me)(CMe3), 15 : (CMe3)2SiF (SiMe3)N? N=C(CHMe2)2. Saltelimination out of 10 und 11 leads to the formation of the first bis(imino)-2,2,4,4-cyclodisilazanes, 16 :[(CMe3)2 SiN? N=C(CHMe2)2]2, 17 : [(CMe3)2SiN? N=CPh2]2. Cyclisation occurs in the reaction of 12 und 14 with tert-butyllithium, 2-silyl-1,2-diaza-3-sila-5-cyclopentenes ( 18 and 19 ) are formed. Dilithiated 1 reacts with SiF4 to give the spirocyclic compound 20 . HF-elimination from 18 and dimerisation of the intermediate diazasilacyclopentadiens lead to the formation of the tricyclus 21 . 相似文献
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H. Dichgans Keller Rusting Fromme Cäsar Loretz L. David E. J. van Itallie J. Blomberg Jr. van Ledden-Hulsebosch A. W. van der Haar Meulenhoff J. W. de Waal Adolf Mayrhofer E. Richter R. Wasickv und M. Joachimowitz 《Fresenius' Journal of Analytical Chemistry》1919,58(6-7):313-321
Ohne Zusammenfassung 相似文献
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C. Tiedeke R. gestattet F. Hirata A. Fink und Ph. Gross 《Fresenius' Journal of Analytical Chemistry》1937,109(5-6):188-191
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《Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy》1982,38(4):475-482
The i.r. and Raman spectra of monomeric AsVi3, SbVi3, Vi3AsHal2 and Vi3SbHal2 (Vi = CH2 = CH-, Hal = F, Cl) have been recorded and assigned. According to these data the compounds have trigonal pyramidal and trigonal bipyramidal structures, respectively, probably with slightly twisted vinyl groups. The 1H- and 13C-NMR spectra of the products have been measured in different solvents and at different temperatures. For the quantum mechanical calculations of these NMR spectra a modified BASIC version of the known fortran programme LAOCOON III was used. 相似文献
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E. Bankmann 《Fresenius' Journal of Analytical Chemistry》1960,176(5):390-391
Ohne Zusammenfassung 相似文献
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Modern hydrocarbon and especially olefin chemistry is concerned with the stereospecificity of catalytic reactions. Mixtures resulting from these reactions must be analyzed for all possible isomers. Only gas chromatography with high resolution and mainly open tubular columns is able to separate the different isomers of unsaturated hydrocarbons present in such mixtures. The identidcation of the separated species is difficult, as the modern combination of mass spectroscopy with capillary columns supplies spectra which are not characteristic enough for identification of such unsaturated hydrocarbons. However, the interpretation of retention data of hydrocarbons may be successful, because small structural variations correspond to definite differences of retention data. The chemical history of the analyzed products and, in the case of methyl-substituted isomers, data on the methylene insertion reaction, make it possible to obtain a relative correlation of separated species. 相似文献