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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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