ZfN: Search Results

1	Author	N. Orbert Auner, Erika Penzenstadler	Requires cookie*
	Title	Silaheterocyclen, XIII Erzeugung und Cycloadditionsverhalten von l,3-Diaza-2,4-disila-unj 1.3-Disilacyclobutanen mit exocyclischer SiC-Doppelbindung Silaheterocycles, XIII Form ation and Cycloaddition Reactions of l,3-Diaza-2,4-disila-and 1.3-Disilacyclobutanes Containing an Exocyclic SiC Double Bond
	Reference	Z. Naturforsch. 47b, 217 (1992); eingegangen am 16. Juli/19. August 1991
	Published	1992
	Keywords	Silaheterocycles, Synthesis o f l, 3-Diaza-2, 4-disilacyclobutane, Form ation o f Silenes, Cycloaddition Reactions
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	TEI-XML for	default:Reihe_B/47/ZNB-1992-47b-0217.pdf
	Identifier	ZNB-1992-47b-0217
	Volume	47

2	Author	N. Orbert Auner, Erika Penzenstadler, Eberhardt Herdtweck	Requires cookie*
	Title	Silaheterocyclen, XX Aminosubstituierte Vinylchlorsilane und Silaethene: Bausteine zur Synthese von l,3-Diaza-2-silacyclopentanen [1] Silaheterocycles, XX Am inosubstituted Vinylchlorosilanes and Silenes: Building Blocks for the Synthesis of l,3-Diaza-2-silacyclopentanes [1]
	Abstract	The amino-substituted vinylchlorosilanes 4 -7 are synthesized from N ,N ,N '-trim ethyl-ethylenediamine (8 a) or tris(trimethylsilyl)ethylenediamine (8 b), LiBu" and organodichloro-vinylsilanes. 5 eliminates trimethylchlorosilane when distilled and yields 1,3-diaza-2-silacyclopentane 9, whereas the com pounds 6 and 7 show a great tendency to oligomerize. The reaction o f 4 with LiBu1 gives a neopentylsilene intermediate 10 a which can be trapped by isoprene or 1,3-butadiene yielding small amounts o f the Diels-Alder products 11 and 12, re spectively. The main reaction pathway for 10 a is rearrangement with migration o f a M e3Si-group from nitrogen to the silene's carbon atom and a new N —Si bond formation to give the diazasilacyclopentane 10 which has been characterized by X-ray diffraction analysis. This in tramolecular rearrangement appears to involve a pentacoordinated silene Si-atom. N o dimer-isation o f 10a to a disilacyclobutane is observed. The introduction o f a second Si-tris(tri-methylsilyl)ethylenediamine substituent at the SiC frame work does not result in silene stabili sation: there is no evidence for Si-hexacoordination in silene 15 nor in the [4+2] cyclo-addition product with isoprene (14).
	Reference	Z. Naturforsch. 47b, 1377—1385 (1992); eingegangen am 6. Mai 1992
	Published	1992
	Keywords	Silaheterocycles, Synthesis, Form ation o f Silenes, Cycloaddition Reactions, Highly C oordinated Silicon
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	TEI-XML for	default:Reihe_B/47/ZNB-1992-47b-1377.pdf
	Identifier	ZNB-1992-47b-1377
	Volume	47