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1992[X]
1Author    CeyhanK. Ayran, Saim ÖzkarRequires cookie*
 Title    Synthesis and N M R Study of ( rf-l ,4-diphenyl-l ,3-butadiene)tricarbonyl- chromium(O)  
  Reference    Z. Naturforsch. 47b, 1051 (1992); received March 3 1992 
  Published    1992 
  Keywords    Chromium carbonyl, 1, 4-Diphenylbutadiene 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1051_n.pdf 
 Identifier    ZNB-1992-47b-1051_n 
 Volume    47 
2Author    Christian Müller, ThomasG. Meyer, Michael Farkens, R.Alf Sonnenburg, Reinhard SchmutzlerRequires cookie*
 Title    Zur Chemie der 4,6-D ioxo-l,3,5,2 A3-triazaphosphinane. Teil II*. Darstellung von 4,6-Dioxo-l,3>5,2 A3-triazaphosphinanen  
  Reference    Z. Naturforsch. 47b, 760—7 (1992); eingegangen am 30. Dezember 1991 
  Published    1992 
  Keywords    1, 3, 5-Triorganosubstituted Biurets, 1, 3, 5-Triorgano-Substituted 4, 6-D ioxo-l, 3, 5, 2A 3-triazaphosphinanes, N M R Spectra, M ass Spectra 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0760.pdf 
 Identifier    ZNB-1992-47b-0760 
 Volume    47 
3Author    N. Orbert Auner, Erika PenzenstadlerRequires cookie*
 Title    Silaheterocyclen, XVII Synthese und Cycloadditionsreaktionen neuartiger, aminocyclischer Silaethene [1] Silaheterocycles, XVII Synthesis and Cycloaddition Reactions of Novel Amino Cyclic Silenes [1]  
 Abstract    The silene 2 is formed by reacting 2-chloro-l,3-bis(trimethylsilyl)-2-vinyl-1,3-diaza-2-silacyclopentane (5) with LiBu' in «-pentane in the tem perature range from -1 0 to +10 °C. The reaction primarily leads to the corresponding a-lithio adduct 6 by addition of the Li-organyl to the vinyl group o f 5; subsequent 1,2-LiCl elimination yields 2 as an intermediate. 2 can be trapped by polar reagents M e3SiX (X = OMe, 0 S 0 2C F 3) as well as by organic dienes which add across the Si = C bond; in the absence of trapping agents, trisilacyclohexane 7 is isolated. The cycloaddition behaviour of 2 is best described by the two mesomeric formulae (a) and (ß), with competitive [4+2] and [2 + 2] addition routes: While with butadienes and norbor-na-2,5-diene the [2 + 2] products are formed mainly in a multiple step reaction via zwitterionic intermediates (1,4 dipoles), the ratio o f the [4+2]/[2 + 2] derivatives from 2 and cyclohexa-1,3-diene becomes nearly equivalent. 2 is thus quite com parable in its reactivity to dichloro-neopentylsilene, Cl2Si = C H C H 2Bu'. 
  Reference    Z. Naturforsch. 47b, 795—804 (1992); eingegangen am 25. November 1991 
  Published    1992 
  Keywords    Silaheterocycles, Synthesis, 1, 3-Bis(trimethylsilyl)-1, 3-diaza-2-silacyclopentane, F orm ation o f Silenes, Cycloaddition Reactions 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0795.pdf 
 Identifier    ZNB-1992-47b-0795 
 Volume    47