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1994[X]
1Author    Norbert Auner, Carola Wagner, Wolfgang ZieheRequires cookie*
 Title    Silaheterocyclen, XXVII. Substituenteneffekte zur Steuerung des Cycloadditionsverhaltens von Silaethenen [1] Silaheterocycles, XXVII. Controlling the Cycloaddition Behavior of Silenes by Substituent Effects [1]  
 Abstract    The silene Cl2Si=C(Ph)CH2Bu' (2) is formed by the reaction o f l,l,l-trichloro-2-phenyl-l-silaprop-2-ene (1) with LiBu' in n-pentane in the temperature range from -1 5 to 0 °C. TTie reaction initially leads to the corresponding a-lithio adduct A (addition o f LiBu' to the vinyl group of 1); subsequent LiCl elimination yields 2 as an intermediate. 2 can be trapped by Me3SiOMe (3) and dienes which add across the Si=C bond. In the absence of trapping agents but in the presence of the Lewis base N E t3 the mixture 1/LiBu' reacts to give the disilacyclobutane 4. Due to its electronic and steric properties, Cl2Si=C(Ph)C H 2Bu' (2) and butadienes yield mainly the D iels-A lder adducts (5, 7, 9) while with styrene and 1,3-cyclo-hexadiene the [2 + 2] and [4 + 2] products are formed in competition. With 2-norbornene, 2,5-norbornadiene and quadricyclan the [2 + 2] and [2 + 2 + 2] products are formed selectively but only in low yields. In all reactions except with quadricyclan an ene-reaction com petes with the cycloaddition leading to ene-com pounds as by-products. 
  Reference    Z. Naturforsch. 49b, 831 (1994); eingegangen am 18. Februar 1994 
  Published    1994 
  Keywords    Silaheterocycles, l, l, l-Trichloro-2-phenyl-l-silaprop-2-ene, Substituent Effects, Formation of Silenes, Cycloaddition Reactions 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0831.pdf 
 Identifier    ZNB-1994-49b-0831 
 Volume    49 
2Author    Richard Goddard3, Carl Krüger3, Abdul Ghassan, Karl-Heinz Hadib, Joachim Thieleb, ScholzbRequires cookie*
 Title    Homoleptische 1,4-Diazadienverbindungen elektronenarmer Übergangsmetalle. Synthese, Eigenschaften und Strukturen von (D A D )2Ti und (D A D )3Ti [1] Homoleptic 1,4-Diazadiene Compounds of Early Transition Metals. Syntheses, Properties and Structures of (D A D )2Ti and (D A D )3Ti [1]  
  Reference    Z. Naturforsch. 49b, 519—528 (1994); eingegangen am 13. O ktober 1993 
  Published    1994 
  Keywords    H eterodiene Titanium Complexes, l, 4-D iaza-l, 3-diene, Endiam ide Structure, 7i-A cceptor Ligand 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0519.pdf 
 Identifier    ZNB-1994-49b-0519 
 Volume    49 
3Author    Marianne Baudler, Helmut Tschäbunin, H. Orst Suchomel, Jürgen HasenbachRequires cookie*
 Title    Beiträge zur Chemie des Phosphors, 228 [1] Funktionalisierte Diphosphane als Synthesebausteine: LiH(f-BuP)2, Li2(r-BuP)2, K2(i-PrP)2, (*-PrP)2Cl2 Contributions to the Chemistry of Phosphorus, 228 [1] Functionalized Diphosphanes as Synthetic Building Blocks: LiH(r-BuP)2, Li2(f-BuP)2, K2(/-PrP)2, (/-PrP)2Cl2  
  Reference    Z. Naturforsch. 49b, 773—7 (1994); eingegangen am 28. März 1994 
  Published    1994 
  Keywords    Diphosphanes, 1 -Lithium-2-hydrogen-1, 2-di-rm-butyldiphosphide, 12-Dilithiurn-l, 2-di-rm-butyldiphosphide, l, 2-Dipotassium -l, 2-diisopropyldiphosphide, 12-Dichloro-l, 2-diisopropyldiphosphane 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0773.pdf 
 Identifier    ZNB-1994-49b-0773 
 Volume    49