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1993 (2)
1Author    MichaelW Z Enke+, Karl HensenRequires cookie*
 Title    Thermodynamische Untersuchungen der Systeme Pyridin/CH3SiCl3 und Pyridin/Cl3C CH3 Thermodynamic Examinations of the Systems Pyridine/CH3SiCl3 and Pyridine/C13CCH3  
 Abstract    The isobaric m elting and boiling diagrams for the systems: pyridine/m ethyltrichlorosilane and pyridine/1,1,1-trichloroethane are reproduced. The existence of the congruently melting addition com pound C H 3SiCl3-(P yridin)2 could be confirm ed. S om e m easu rem en ts o f the m olar volu m e o f m ixtures b etw een pyridine and m ethyltrichlorosilane and pyridine and 1,1,1-trichloroethane, respectively, are reported. For both system s the m olar excess v o l­ um e and for the system pyridine/m ethyltrichlorosilane the m olar excess en th alp ie have b een calculated as a function o f the m ole fractions. 
  Reference    Z. Naturforsch. 48b, 1127 (1993); eingegangen am 19. März 1993 
  Published    1993 
  Keywords    Phase Diagram s, Pyridine, M ethyltrichlorosilane, 1, 1, 1-Trichloroethane, E xcess V alues 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1127.pdf 
 Identifier    ZNB-1993-48b-1127 
 Volume    48 
2Author    N. Orbert, A. Uner, R. Einer Probst, Claus-Rüdiger Heikenwälder, E. Berhardt Herdtweck, Siegfried Gam, G.Erhard Müller3Requires cookie*
 Title    Beeinflussen interne N-Donorliganden Hydrolyse-und Kondensationsreaktionen von Chlorsilanen? D o Internal N-D onor Ligands Influence the Hydrolysis and Condensation Reactions of Chlorosilanes?  
 Abstract    The reaction of [C6H4CH2N(CH3)2]2SiCl2 (1) with hydrogen chloride gives the singly pro-tonated adduct 2. Its solid state structure has been determined by single crystal X-ray dif­ fraction. Centrosymmetric 2 is orthorhombic, space group Pbca, a = 1694.9(2), b = 1161.7(2), c = 2501.7(3) pm; Z -8. Controlled hydrolysis of 1 leads to the 1,3-siloxanediol 4, probably via the precursors 3 a -3 c which could not be isolated. The hydrogen chloride formed during the hydrolysis protonates two of the dimethylamino groups, while the other two dimethyl-amino functions form hydrogen bonds to the silanol groups. Centrosymmetric 4: monoclinic, space group P 2Jc, a = 980.3(1), b = 933.9(1), c = 2177.5(2) pm, ß = 99.94(1)°; Z = 4. If the hydrolysis is carried out in the presence of lithium naphthalenide, the metalated compound {[C6H4CH2N(CH3)2]2Si(OLi)OH}4-2LiCl-2CHCl3 (5) is obtained. The solid state structure of 5 exhibits two cube-like subunits which are held together by nitrogen and oxygen lithium contacts, hydrogen bonds between silanol groups and nitrogen atoms, and which are linked by the four silicon centres. Tetrameric 5: monoclinic, space group C2/C or Cc; a -1523.6(2), b -2440.2(1), c = 2534.8(2) pm, ß = 93.83(3)°; Z = 8. These results show that the intramolec­ ular donor capabilities of the dimethylaminobenzyl ligand at silicon can stabilize 1,3-süox-anediol and SiOLi substructures. Compounds like 1 serve as model compounds for the con­ trolled formation of precursors for silicone synthesis. 
  Reference    Z. Naturforsch. 48b, 1625—1634 (1993); eingegangen am 26. Juli 1993 
  Published    1993 
  Keywords    Amino-Functionalized Dichlorosilanes, Control of Hydrolysis Reactions, 1, 3-Siloxanediol, Lithium Cluster, Structure 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1625.pdf 
 Identifier    ZNB-1993-48b-1625 
 Volume    48