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'NMR Data' in keywords Facet   section ZfN Section B:Volume 053  [X]
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1998 (6)
1Author    Z. NaturforschRequires cookie*
 Title    R eaction o f 9-B orabicyclo[3.3.1]nonane with N-Trim ethylsilylam ines -C leavage o f the N-Si or N -H Bond  
 Abstract    The reaction of dimeric 9-borabicyclo[3.3.1]no-nane 1 with N-trimethylsilyl-aniline 2 affords 9-anilino-9-borabicyclo[3.3.1]nonane 5 by elimina­ tion of trimethylsilane. In contrast, 1 reacts with the N-trimethylsilyl-2-aminopyridines 3 and 4 se­ lectively by elimination of H 2 to give the corre­ sponding N-trimethylsilyl-aminoboranes 6 and 7. The latter reactions proceed via formation of bo-rane-pyridine adducts. 
  Reference    Z. Naturforsch. 53b, 393—395 (1998); received December 29 1997 
  Published    1998 
  Keywords    Aminoborane, Aminosilane, Boron, Pyridine, NMR Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0393_n.pdf 
 Identifier    ZNB-1998-53b-0393_n 
 Volume    53 
2Author    Max Herberhold, Silke Gerstmann, Bernd WrackmeyerRequires cookie*
 Title    Tetrakis(sulfurdiimido)silane, -germane and -stannane  
 Abstract    Two tetrakis(sulfurdiimido)silanes [Si(NSNR)4 (R = rBu la, SiMe3 lb)], two germanes [Ge(NSNR)4 (R = rBu 2a, SiMe3 2b)] and one stannane [Sn(NSN?Bu)4Sn 3a] were prepared and characterised by 'H, l3C, i5N, 29Si and ll9Sn NMR spectroscopy in solution, and 3a was also studied in the solid state by 1 l9Sn CP/MAS NMR. Whereas la,b and 2a,b are monomeric in solution, the 119Sn NMR data suggest that 3a is associated both in solution and in the solid state, and that the tin atoms are hexa-coordinated. The attempted stepwise synthesis of la by using one, two, three or four equivalents of K[(NSN)rBu] led to mixtures of la with Cl3Si(NSNrBu) 4a, Cl2Si(NSN/Bu)2 5a, and ClSi(NSNfBu)3 6a. Only one sulfurdiimido ligand of the silane la reacted with hexachlorodisilane by oxidative addition and cleavage of the Si-Si bond to give the new heterobicyclic derivative 7a which is held together by two different coordinative N-Si bonds. 
  Reference    Z. Naturforsch. 53b, 573—580 (1998); received March 30 1998 
  Published    1998 
  Keywords    Silicon, Germanium, Tin, Sulfur Diimides, Heterocycles, NMR Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0573.pdf 
 Identifier    ZNB-1998-53b-0573 
 Volume    53 
3Author    Michael Schmidt, Hubert SchmidbaurRequires cookie*
 Title    Ligand Redistribution Equilibria in Aqueous Fluoroberyllate Solutions  
 Abstract    The composition of aqueous fluoroberyllate solutions has been studied by 9Be and l9F NMR spectroscopy for various ratios of the beryllium and fluorine concentrations, and at different pH values. The equilibrium constants have been determined for the ligand exchange processes, which involve the species [Be(OH2)4]2+, [BeF(OH2)3]+, [BeF2(OH2)2], [BeF3(OH2)]_ , and [BeFzi]2 -. These equilibria are shifted towards [BeF4]2_ at high pH. No polynuclear fluo­ roberyllates have been detected. The fluoride exchange between the individual species is slow on the NMR time scale at room temperature, and separate sharp signals with the expected multiplicity are therefore recorded. Calculated 9Be chemical shifts are in good agreement with experimental data. 
  Reference    Z. Naturforsch. 53b, 1294—1300 (1998); received July 17 1998 
  Published    1998 
  Keywords    Fluoroberyllates, Beryllium Fluoride, Ligand Redistribution, NMR Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1294.pdf 
 Identifier    ZNB-1998-53b-1294 
 Volume    53 
4Author    Frank Leßmann3, Lothar Beyer3, Rainer Richter3, Reinhard MeusingerbRequires cookie*
 Title    N-Benzoylthiocarbamoyl Amino Acid Ethyl Esters as Chelate Ligands for Transition Metal Ions  
 Abstract    The reactions of benzoyl isothiocyanate with amino acid ethyl esters (N-butyl glycine ethyl ester, (S)-(-)-proline ethyl ester) give N-benzoylthiocarbamoyl amino acid ethyl esters. Apart from the expected N-benzoylthiocarbamoyl (S)-(-)-proline ethyl ester the racemic N-benzoyl­ thiocarbamoyl (/?)/(S)-proline ethyl ester is formed because of base catalyzed racemization of the educt (5')-(-)-proline ethyl ester during the reaction of (S)-(-)-proline ethyl ester hy­ drochloride with triethylamine. The structures of both compounds were established by X-ray crystal structure analysis and specific optical rotation measurements. The ligands yield neutral 2:1 chelates with Ni , Cu11, Pd11 and Pt11. The carboxylic oxygen atoms are not involved in the chelation. The ligands and the resultant complexes show configurational E/Z isomerism. In the case of the chelates of the racemic N-benzoylthiocarbamoyl (/?)/(5)-proline ethyl ester, additional R/S isomerism is observed as shown by 
  Reference    Z. Naturforsch. 53b, 981—990 (1998); received November 11 1997 
  Published    1998 
  Keywords    Thioureas, Amino Acid Ethyl Esters, Chelates, NMR Data, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0981.pdf 
 Identifier    ZNB-1998-53b-0981 
 Volume    53 
5Author    ViktorP. Balema, Steffen Blaurock, Evamarie Hey-HawkinsRequires cookie*
 Title    Synthesis and Molecular Structure of a Superbulky Tertiary Phosphine: Bis[2-phenyl-l,2-dicarba-c/oso-dodecaboran-l-yl(12)]phenylphosphine  
 Abstract    Bis[2-phenyl-l,2-dicarba-c/oso-dodecaboran-l-yl(12)]phenylphosphine (2) was obtained in 91% yield from phenyldichlorophosphine and two equivalents of l-lithium-2-phenyl-l ,2-dicarba-c/o5o-dodecaborane(12) in ether and characterized by spectroscopy (3IP, 1 B, 'H, l3C NMR; IR) and by X-ray structure determination. 
  Reference    Z. Naturforsch. 53b, 1273—1276 (1998); received May 20 1998 
  Published    1998 
  Keywords    Synthesis, Molecular Structure, X-Ray Data, NMR Data, Phosphine 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1273.pdf 
 Identifier    ZNB-1998-53b-1273 
 Volume    53 
6Author    Nils Wiberg, Angelika Wörner, Hans-Wolfram Lerner, Konstantin Karaghiosoff1, Heinrich Nöth1Requires cookie*
 Title    Darstellung  
 Abstract    , Struktur und Reaktivität des Pentaphosphids (/Bu3Si)3P5Na2 und des Pentaphosphans (fBu3Si)3P5 [2] Supersilyl Compounds of Phosphorus, V [1]. Preparation, Structure, and Reactivity of the Pentaphosphide (?Bu3Si)3P5Na2 and the Pentaphosphane (?Bu3Si)3P5 [2] The orange THF adduct (fBu3Si)3 P5Na2(THF)4 of the pentaphosphide (rBu3Si)3P5Na2 (3) has been prepared, (i) by protolysis of the tetraphosphide (?Bu3Si)2P4Na2(THFj;! (2) with CF3C 0 2H in THF (molar ratio 2 : 1) , (ii) by dissolving crystalline 2 in toluene, and (iii) by the reaction of P4 with /Bu3 SiNa(THF)2 in benzene (molar ratio 1 : 4). According to an X-ray structural analysis, the THF adduct of 3 contains a P3 ring with two PNa(Si?Bu3) substituents in cis position and one SifBu3 substituent in trans position to the former groups. The protolysis of 3 with CF3C 0 2H leads to the pentaphosphane P5 H2(SifBu3) 3 (9), the silylation of 3 with Me2SiCl2 to the pentaphosphane P5(SiMe2)(Si?Bu3) 3 (10), and the oxidation of 3 with C2(CN)4 to the pentaphosphane P5 (Si/Bu3) 3 (5). The structures of 3,5,9, and 10 have been assigned from 1|P and ~4Si NMR data. The pentaphosphane 5 contains a hitherto unknown Ps backbone of a P3 ring anellated with a P4 ring. Supersilylverbindungen des Phosphors, V [1]. 
  Reference    Z. Naturforsch. 53b, 1004—1014 (1998); eingegangen am 17. April 1998 
  Published    1998 
  Keywords    Silicon, Phosphorus, Supersilyl, Oligophosphides and -phosphanes, NMR Data, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1004.pdf 
 Identifier    ZNB-1998-53b-1004 
 Volume    53