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1981[X]
1Author    Volker Bätzel, Roland BoeseRequires cookie*
 Title    Synthesis and Structure of 1,2,3-Thiadiazol-and 1,2,3-Selenadiazol-Pentacarbonyl-Complexes of the Elements Chromium and Tungsten  
 Abstract    From the reactions of (THF)M(CO)5 (M = Cr, W) with 4-phenyl-l,2,3-thiadiazol, 4-methyl-5-carboxylic acid-l,2,3-thiadiazol, 4-methyl-5-carboxylic acid ethyl ester-1,2,3-thiadiazol and 4-methyl-l,2,3-selenadiazol, pentacarbonyl-complexes are obtained as air stable compounds. IR spectra of products of similar reactions with M = Mo provide some evidence of the formation of analogous complexes. The thiadiazol complexes are also accessible directly, by photochemical displacement of carbonmonoxid in THF from the parent carbonyl. The X-ray structures of pentacarbonyl-(4-phenyl-l,2,3-thiadiazol)-tungsten and pentacarbonyl-(4-methyl-l,2,3-selenadiazol)-chromium show the coordina-tion of the ligand to the pentacarbonyl-metal-fragment via the nitrogen in position 2. 
  Reference    Z. Naturforsch. 36b, 172—179 (1981); eingegangen am 15. Oktober/21. November 1980 
  Published    1981 
  Keywords    1, 2, 3-Thiadiazoles, 1, 2, 3-Selenadiazoles, Pentacarbonyl Complexes 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0172.pdf 
 Identifier    ZNB-1981-36b-0172 
 Volume    36 
2Author    Klaus Burger, Herbert Goth, Eduard BurgisRequires cookie*
 Title    Zum Thermolyseverhalten von 2.2-Dihydro-1.4.2-oxazaphosphol-4-enen, II [1] Eine einfache Synthese für fluorsubstituierte N-Vinylimidoylchloride Thermolysis of 2,2-Dihydro-l,4,2-oxazaphosphol-4-enes, II [1] A Simple Synthesis for Fluorine Substituted N-Vinylimidoyl Chlorides  
 Abstract    3,3-Bis(chlorodifluoromethyl)-2,2,2-trimethoxy-2,2-dihydro-l,4,2-oxazaphosphol-4-enes (2) at room temperature, 3,3-bis(chlorodifluoromethyl)-2,2,2-triphenoxy-2,2-dihydro-l,4,2-oxazaphosphol-4-enes (3) at 140-145 °C undergo cycloelimination of trimethyl, and triphenyl phosphate, respectively, with formation of N-[l-chlorodifluoromethyl-2,2-di-fluoro(vinyl)]-imidoyl chlorides (4) in high yields. 
  Reference    Z. Naturforsch. 36b, 353—358 (1981); eingegangen am 18. November 1980 
  Published    1981 
  Keywords    Phosphorus Compounds, [3 + 2] Cycloreversion Reactions, [1, 4] Chlorine Shift, 2 -Azabuta-1, 3 -dienes 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0353.pdf 
 Identifier    ZNB-1981-36b-0353 
 Volume    36 
3Author    EricaL. Weinberg, J.Thomas Burton, MichaelC. Baird, Max HerberholdRequires cookie*
 Title    A Novel Isomerization of an Electron-Rich Alkene  
 Abstract    Displacement of 2-methvlpropene from [Fp(Me2C = CH2)]BF4 (Fp = (/?5-C5H5)Fe(CO)2) by Z-1,2-dimethoxyethylene (Z-DME) gives [Fp(Z-DME)]BF4. Displacement by E-1,2-dimethoxyethylene (E-DME), in contrast, does not give the expected complex of E-DME, but rather the complex of the Z-alkene. A mechanism involving scission of the C = C bond of the coordinated alkene to give a bis-carbene intermediate is proposed. 
  Reference    Z. Naturforsch. 36b, 485—487 (1981); received February 9 1981 
  Published    1981 
  Keywords    Organoiron Complexes, Olefin Isomerization, 1, 2-Dimethoxyethylene 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0485.pdf 
 Identifier    ZNB-1981-36b-0485 
 Volume    36 
4Author    Herbert Meier, Johannes Zountsas, Oswald ZimmerRequires cookie*
 Title      
 Abstract    A X H and 13 C NMR spectroscopical study is performed on the basis of 37 1,2,3-selena-diazoles. Besides the discussion of chemical shifts and coupling constants of X H and 13 C, selenium satellites were measured providing 1 H 77 Se and 13 C 77 Se coupling constants. 
  Reference    Z. Naturforsch. 36b, 1017—1022 (1981); eingegangen am 16. April 1981 
  Published    1981 
  Keywords    NMR Spectra, 1, 2, 3-Selenadiazoles, 77 Se Coupling 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1017.pdf 
 Identifier    ZNB-1981-36b-1017 
 Volume    36 
5Author    Udo Plücken, Herbert MeierRequires cookie*
 Title    Lanthanide Induced Shifts in the »H and 13 C Nuclear Magnetic Resonance Spectroscopy for Structure Elucidations of Thiadiazole Oxides  
 Abstract    A systematic investigation of the LIS-method for structure elucidations is performed on the basis of thermally generated monoxides of 1,2,3-thiadiazoles. A calculation process for the evaluation of lanthanide induced shifts according to the McConnell-Robertson equa-tion was developed. The program can be applied to underdetermined systems with fewer variables than chemically not equivalent X H plus 13 C nuclei. A quality criterium for the method is given by 4-phenyl-l,2,3-thiadiazole-3-oxid -wellknown by an X-ray analysis. 
  Reference    Z. Naturforsch. 36b, 1305—1314 (1981); eingegangen am 21. Aprü 1981 
  Published    1981 
  Keywords    1, 2, 3-Thiadiazole-oxides, LIS Measurements, LIS Computer Program 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1305.pdf 
 Identifier    ZNB-1981-36b-1305 
 Volume    36 
6Author    Waldemar Adam, Omar CuetoRequires cookie*
 Title    3,3-Dimethyl-4 [2-methyl-l-propenyl] -1,2-dioxetane: Its Thermal Stability and Chemiluminescent Properties  
 Abstract    The alkenyl-substituted 1,2-dioxetane (1) was prepared by photosensitized singlet oxygenation of 2,5-dimethyl-2,4-hexadiene and its activation and excitation parameters determined. It is shown that dioxetane (1) is comparable in its thermal stability to alkyl-substituted dioxetanes and an inefficient chemical source of electronic excitation. 
  Reference    Z. Naturforsch. 36b, 1653—1654 (1981); received June 29 1981 
  Published    1981 
  Keywords    1, 2-Dioxetanes, Chemüuminescence, Activation Parameters, Excitation Yields, Solvent Effects 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1653.pdf 
 Identifier    ZNB-1981-36b-1653 
 Volume    36 
7Author    Egon Fahr, Peter FecherRequires cookie*
 Title    Die Darstellung von 1.3-Dunethyl-6-hydroxy-dihychothymin durch photochemische Wasser-Addition an 1.3-Dimethyl-thymin + Preparation of 1,3-Dimethyl-6-hydroxy-dihydrothymine by Photochemical Addition of Water to l,3-Dimethyl-thymine +  
 Abstract    UV irradiation of aqueous solutions of 1,3-dimethyl-thymine with wavelength > 280 nm yields the eis-and trans-form of water addition product l,3-dimethyl-6-hydroxy-dihydro-thymine (2/3). 
  Reference    Z. Naturforsch. 36b, 226—230 (1981); eingegangen am 16. Juli 1980 
  Published    1981 
  Keywords    UV Irradiation, 1, 3-Dimethyl-thymine, l, 3-Dimethyl-6-hydroxy-dihydro-thymine 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0226.pdf 
 Identifier    ZNB-1981-36b-0226 
 Volume    36 
8Author    Marianne Baudler, Jochen HellmannRequires cookie*
 Title    Contributions to the Chemistry of Phosphorus, 89 [1] Cyclization of a 1,3-Dihalogen-1,2,3- triorganyltriphosphane to the Corresponding Triorgany 1-cy clotriphosphane  
 Abstract    Tri-Jerf-butyl-cyclotriphosphane is obtained by the dehalogenation of l,3-diiodo-l,2,3-tri-£erf-butyl-triphosphane with lithiumhydride. This reaction represents a so far unknown type of ring-closure leading to cy clotriphosphanes, which corresponds to the classical synthesis of cyclo -propanes starting from 1,3-dichloropropanes. 
  Reference    Z. Naturforsch. 36b, 266—267 (1981); eingegangen am 13. Oktober 1980 
  Published    1981 
  Keywords    1, 3-Dihalogen-1, 2, 3-triorganyltriphosphanes, Cy clotriphosphanes, Tri-feri-butylcyclotriphosphane 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0266_n.pdf 
 Identifier    ZNB-1981-36b-0266_n 
 Volume    36 
9Author    Gernot Frenking, Helmut SchwarzRequires cookie*
 Title    Frontorbitale und 1.2-Hydridwanderungen in Carbeniumionen Frontier Orbitals and 1,2-Hydrogen Shifts in Carbenium Ions  
 Abstract    For various carbenium ions it is shown that the energy value and the degree of localiza-tion of the LUMO have a significant influence on the energy barriers of 1,2-hydrogen shifts. The structures of the transition states are in line with the Hammond-Postulate. 
  Reference    Z. Naturforsch. 36b, 797—801 (1981); eingegangen am 10. März 1981 
  Published    1981 
  Keywords    Carbocation Chemistry, 1, 2-Hydrogen Migration, Frontier Orbitals, Quantum Mechanical Calculations, Transition States 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0797.pdf 
 Identifier    ZNB-1981-36b-0797 
 Volume    36 
10Author    Klaus Burger, Herbert Goth, Kurt Einhellig, Alfred GierenRequires cookie*
 Title    Zum Thermolyseverhalten von 2.2-Dihydro-1.4.2-oxazaphosphol-4-enen, I Über die Dimerisierung von bis(trifluormethyl)substituierten Nitril-yliden [1, 2] Thermolysis of 2,2-Dihydro-l,4,2-oxazaphosphol-4-enes, I Dimerization of Bis(trifluoromethyl) Substituted Nitrile Ylides [1, 2]  
  Reference    Z. Naturforsch. 36b, 345—352 (1981); eingegangen am 18. November 1980 
  Published    1981 
  Keywords    I, 4, 2-Oxazaphosphoranes, 5->-[3 + 2]Cycloreversion Reactions, 1, 3-Dipole Dimerization, Head to Head Dimerization 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0345.pdf 
 Identifier    ZNB-1981-36b-0345 
 Volume    36 
11Author    Erhard Jägers, Bert Steffan, R. Enata Von Ardenne, Wolfgang SteglichRequires cookie*
 Title    Stoffw echselprodukte des  
 Abstract    2.4-Trihydroxy-benzols aus Fruchtkörpern von G om phidius m aculatus und G. glutinosus (B oletales) [1] M etabolites of 1,2,4-Trihydroxybenzene from Fruiting Bodies o f Gomphidius maculatus and G. glutinosus (Boletales) [1] 
  Reference    Z. Naturforsch. 36c, 488—4 (1981); received February 25 1981 
  Published    1981 
  Keywords    Gomphidius, Boletales, 1, 2, 4-Trihydroxybenzene, 2, 2', 4, 4', 5, 5'-Hexahydroxybiphenyl, Gomphilactone, Postemak Rearrangement 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0488_n.pdf 
 Identifier    ZNC-1981-36c-0488_n 
 Volume    36