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61Author    Michael Feist, Sergej Trojanov, Erhard KemnitzRequires cookie*
 Title    Die Kristallstrukturen von 1,4-Dimethylpiperazinium-tetrabromo- cobaltat(II) und -zinkat(II), (dmpipzH2) [Mn Br4] (M = Co, Zn)  
 Abstract    The Crystal Structures of 1,4-Dimethylpiperazinium Tetrabromocobaltate(II) and -Zincate(II), (dmpipzH2) [MHBr4] (M = Co, Zn) The compounds (dmpipzH2)[MnBr4] (M = Co, Zn) crystallize at room temperature from equi-molar solutions of 1,4-dimethylpiperazine and MBr2 • n H20 in 3M HBr. (dmpipzH2)[CoBr4] is isotypic with the homologous chlorometalates of Co and Zn and crystallizes in the mono­ clinic space group P2,/m with a = 6.424(3), b = 14.588(6), c = 7.102(6) A, ß = 90.87(6)°, Z = 2. (dmpipzH2)[ZnBr4], however, crystallizes in the monoclinic space group P2,/c with a = 7,605(5), b = 13,760(9), c = 13,286(7) Ä, ß = 93,03(6)°, Z = 4. Both structures con­ tain centrosymmetric cations (dmpipzH2)2+ in the chair form and slightly distorted tetrahedra [MBr4]2~ with a mirror plane in the case ofM = Co. Several distances N- • -Brin both structures are interpreted in terms of N-H- • Br hydrogen bonds which are favoured by the packing in the case of M = Zn. 
  Reference    (Z. Naturforsch. 51b, 9—13 [1996]; eingegangen am 12. Juni 1995) 
  Published    1996 
  Keywords    1, 4-Dimethylpiperazinium Tetrabromometalates(II), Cobalt, Zinc, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0009.pdf 
 Identifier    ZNB-1996-51b-0009 
 Volume    51 
62Author    Z. NaturforschRequires cookie*
 Title    Synthese und Dimerisierungsverhalten des l,l-Bis(trimethylsilyl)-2-(2,5-diisopropylphenyl)silens  
 Abstract    Tris(trim ethylsilyl)silylmagnesium bromide, (Me^SiX^SiMgBr, reacts with 2.5-diisopropyl-benzaldehyde to give 2,5-diisopropylphenyl-tris(trimethylsilyl)silylmethanol (1). With sodium 
  Reference    Z. Naturforsch. 51b, 370—3 (1996); eingegangen am 21. August 1995 
  Published    1996 
  Keywords    Silenes, Silene Dimerization, 2, 3-Disilanaphthalenes Tetrahydro, 1, 2-Disilacyclobutanes 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0370.pdf 
 Identifier    ZNB-1996-51b-0370 
 Volume    51 
63Author    JosephG. Robe, Duc Le Van, JostW. Innemöller, Bernt Krebs, M. Echtild LägeRequires cookie*
 Title    Reaktive E=C(p-p)7r-Systeme, XLIII [1] Darstellung und Charakterisierung P-Phosphino-oder P-Arsino-substituierter Fluorphosphaalkene des Typs R2E-P=C(F)NEt2 (R = Me, CF3, Me2N; E = P, As)  
 Abstract    Reactive E=C(p-p)-7r System s XLIII [1] Synthesis and Characterization o f P -Phosphino or P-A rsino Substituted Fluoro-phosphaalkenes of the Type R 2E -P=C (F)N Et2 (R = Me, C F 3, M e7N; E = R As) The easily accessible phosphaalkene HP=C(F)NEt2 (lb) reacts with halophosphanes or -arsanes R2EX (X = Cl, I) in the presence of NEt3 to give P-phosphino-or -P-arsino sub­ stituted fluorophosphaalkenes of the type RiE-P=C(F)NEti (2 -6) in high yields (60 -85 %) [R2E: (CF3)2P (2), Me2N(CF3)P (3), Me2P (4), (CF3)2As (5), M e2As (6)]. The analogous re-action of ib with CF3PI2 (molar ratio 1:2) unexpectedly leads to the triphosphetene Et2N 
  Reference    Z. Naturforsch. 51b, 778—784 (1996); eingegangen am 30. November 1995 
  Published    1996 
  Keywords    Phosphaalkenes, 1, 2, 3-Triphosphetenes, NMR Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0778.pdf 
 Identifier    ZNB-1996-51b-0778 
 Volume    51 
64Author    Z. NaturforschRequires cookie*
 Title    ,1-Organoboration of Sterically Hindered Tetra-l-alkynylsilanes and the Crystal Structure of Tetrakis[l-(3,3-dimethyl)butynyl]silane  
 Abstract    Tetra-l-alkynylsilanes, Si(C sC R *)4 with R 1 = 'Bu (1) and SiMe3 (2) react with triethyl-borane, E t3B. by intermolecular 1,1-ethyloboration followed by intramolecular 1.1-vinylo-boration. to give the substituted siloles 3 and 5 with two R 'C = C groups linked to silicon. The formation of 5 (R 1 = SiMe3) requires exactly one equivalent of E t3B, whereas 3 (R 1 = 'Bu) is formed after = 2 0 d in boiling toluene in the presence of a large excess of E t3B, and the remaining 'B u -C = C groups in 3 do not react with E t3B. The 1,1-organoboration of 2 using one equivalent of 9-ethyl-9-borabicyclo[3.3.1]nonane, Et-9-BBN, proceeds similar to the E t3B-reaction, to give mainly the silole derivative 6, in which the bicyclic ring system is enlarged by two carbon atoms. This product is the result of a kinetically controlled reaction. The single crystal X-ray analysis of 1 has been carried out (space group Pnm a; a = 990.0(2), b = 1668.0(3), c = 1479.0(3) pm), and its crystal structure is com pared with that of the corre­ sponding tin compound 1 (Sn). 
  Reference    Z. Naturforsch. 51b, 1320—1324 (1996); received March 14 1996 
  Published    1996 
  Keywords    Tetra-l-alkynylsilanes, 1, 1-Organoboration, Siloles, X-Ray 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1320.pdf 
 Identifier    ZNB-1996-51b-1320 
 Volume    51 
65Author    Clemens Krempner1, Rhett Kempeb, Hartmut Oehme3Requires cookie*
 Title    The Thermal Isomerization of a Tetrahydro-2,3-disilanaphthalene into a 1,2-Disilacyclobutane -The Conversion of a Formal Silene [2+4] Cyclodimer into the [2+2] Cycloadduct  
 Abstract    1,2,3,8a-Tetrahydro-1 -mesityl-5,7,8a-trimethyl-2,2,3,3-tetrakis(trimethylsilyl)-2,3-disila-naphthalene (3), the formal [2+4] cyclodimer of the transient 2-mesityl-l,l-bis(trimethylsilyl)-silene (2), on thermal treatment gradually isomerizes to give a mixture of the [2+2] products (E)-and -predominantly -(Z)-3,4-dimesityl-1,1,2,2-tetrakis(trimethylsilyl)-l,2-disilacyclo-butane [(E/Z)-4], By prolonged heating or at higher temperatures both (E/Z)-3 and (Z)-4 are converted into (E)-4, the thermodynamically most stable head-to-head dimer of 2. Possible pathways of the isomerization processes are discussed. 
  Reference    Z. Naturforsch. 52b, 815—818 (1997); received February 14 1997 
  Published    1997 
  Keywords    Silenes, Silene Dimerization, 2, 3-Disilanaphthalene Tetrahydro, 1, 2-Disilacyclobutane 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0815.pdf 
 Identifier    ZNB-1997-52b-0815 
 Volume    52 
66Author    Z. NaturforschRequires cookie*
 Title    Acyclo C-Nucleosides Analogues of Condensed 1,2,4-Triazines  
 Abstract    1-Acyclo C-nucleosides of 7-methyl-10//-l,2,4-triazolo[3,,4':3,4][l,2,4]triazino[5,6-£>]indoles (9) have been prepared by cyclodehydrogenation of the sugar derivatives of 3-hydrazino-8-methyl-5//-l,2,4-triazino[5,6-6]indole (1). The respective linear isomer as 4 has been pre­ pared by a dehydrative cyclization of the amides of 1. Acetylation of the sugar hydrazones and their cyclized products gave the per-7V,0-acetyl derivatives. The molecular connectivity of the products was established by *H, 13C, and 2D H ,H Cosy spectra. 
  Reference    Z. Naturforsch. 52b, 873—882 (1997); received February 17 1997 
  Published    1997 
  Keywords    Acyclo C-Nucleoside, 1, 2, 4-Triazine, Indole, Triazinoindole, Triazolotriazinoindole 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0873.pdf 
 Identifier    ZNB-1997-52b-0873 
 Volume    52 
67Author    Wolfgang Malisch, Klaus Grün3, Alexander Frieda, Wolfgang Reicha, Martin Schmeußer1, Udo Weis3, Christa Abd, El Baky3, Carl KrügerbRequires cookie*
 Title    Phosphenium-Komplexe, X X IX [1]  
 Abstract    [4+2]-Cycloadditionen von Phospheniumkomplexen des Typs C p (O C)2W = P R 2 (R = Alkyl, A ryl) mit 2,3-Dimethylbutadien Phosphenium Complexes, X X IX [1], [4+2]-Cycloaddition of Phosphenium Complexes of the Type Cp(OC)2W=PR2 (R = Alkyl, Aryl) with 2,3-Dimethylbutadiene The phosphenium complexes Cp(OC)2W=PR2 [R = Ph, o-Tol, Me, t-Bu, (2a -d)] react with 2,3-dimethyl-1,3-butadiene (3) via [4+21-cycloaddition to form the phosphametallacyclohexe­ nes Cp(OC)2W-PR2-CH2-CMe=CMe-CH2 (4a -d). The structure of 4a has been determined by X-ray diffraction. 
  Reference    Z. Naturforsch. 53b, 1506—1510 (1998); eingegangen am 12. Mai 1998 
  Published    1998 
  Keywords    Phosphenium Complexes, 1, 3-Dienes, [4+2]-Cycloaddition, Phosphametallacyclohexenes 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1506.pdf 
 Identifier    ZNB-1998-53b-1506 
 Volume    53 
68Author    Kristallstruktur Neuer, Kai Landskron, Wolfgang SchnickRequires cookie*
 Title    Synthese und  
 Abstract    -diphosphazenium bromide [(NH->)3PNP(NHi)3]Br, nitrate 1(NH2)3PNP(NH2)3][N03], and toluene-4-sulfonate [(NH2)3PNP(NH2)3][CH3C6H4S0 3] have been prepared by anion exchange in aqueous solution. Single crystals were obtained from acetonitrile solutions in a temperature gradient between 60 °C and room temperature. The crystal structures were determined by single crystal X-ray methods at room temperature. ([(NH2)3PNP(NH2)3]Br: P i, Z = 2, a = 596.2(1),b = 744.5(1), c = 1114.4(1) pm, a = 108.78(1), ß = 104.18(1), 7 = 90.64(1)°, R 1 = 0.048, wR2 = 0.104; [(NH2)3PNP(NH2)3][N03]: Pi, Z = 2, a = 550.9(1), b = 796.3(1), c = 1115.7(1) pm, a = 94.45(1), ß = 99.55(1), 7 = 101,53(1)°, R l = 0.033, wR2 = 0.095; [(NH2)3PNP(NH2)3][CH3C6H4S 0 3]: P2,/c, Z = 4, a = 804.1(1), b = 596.1(1), c = 3218.7(3) pm, ß = 94.59(1)°, /?1 = 0.052, wR2 = 0.136). In the solid the three salts consist of discrete [(NHi)3PNP(NH2)3]+ cations and their corresponding anions. The PN4 tetrahedra in [(NH2)3PNP(NH2j3]Br are staggered, while in [(NH2)3PNP(NH2)3][N03] the eclipsed conformation is preferred. The PN4 tetrahedra of [(NH2)3PNP(NH2)3][CH3C 6H4S 0 3] show gauche conformation. 
  Reference    Z. Naturforsch. 54b, 1363—1370 (1999); eingegangen am 13. Juli 1999 
  Published    1999 
  Keywords    3, 3, 3-Hexaamino-lA5, 3A5-diphosphazenium-Salze Synthesis and Crystal Structure of Novel l, l, l, 3, 3, 3-Hexaamino-lA5, 3A5-diphosphazenium Salts Phosphazenes, Ion Exchange, Crystal Structure 1, 1, 1, 3, 3, 3-Hexaamino-lA\3A5 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1363.pdf 
 Identifier    ZNB-1999-54b-1363 
 Volume    54 
69Author    Wolfram Bodenmüller, Andreas Ruoff, Laurent ManceronRequires cookie*
 Title    FTIR Study of the v 12 and the v 12 + v 14 — v 14 Bands of 1,3,5-Triazine Near 740 cm -1  
 Abstract    The infrared spectrum of the v 12 fundamental and its accompanying hot band v 12 + v 14 — v 14 of triazine has been measured by means of a Fourier transform spectrometer with a resolution of about 0.0023 cm" 1 . A total of about 2779 rovibrational transitions has been assigned. The ground state constants have been considerably improved whilst the parameters for the excited states tf 12 =l, i; 14 = l and tf 12 =i> 14 = l have been obtained for the first time. The standard deviations were 2.92 • 10" 4 cm" 1 for the ground state constants and 1.53 • 10" 4 cm 1 for the excited state parame-ters of v 12 showing the latter to be unperturbed. The upper state of the hot band v 12 + v 14 — v 14 was found to be perturbed by an accidental resonance. 
  Reference    Z. Naturforsch. 47a, 1197—1203 (1992); received October 20 1992 
  Published    1992 
  Keywords    1, 3, 5-triazine, High resolution FTIR spectroscopy, Ground state constants Funda-mental constants, Hot band constants 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-1197.pdf 
 Identifier    ZNA-1992-47a-1197 
 Volume    47 
70Author    H. Zerbe-Foese, A. Guarnieri, O. L. StiefvaterRequires cookie*
 Title    Microwave and Millimeterwave Spectrum of 1,1-Difluoroethylene and the Vibrational Mode v 10 from FT-IR Spectroscopy  
 Abstract    Pure rotational spectra of 1,1-Difluoroethylene (1,1-DFE) in the vibrational ground state (GS) and in excited vibrational states (EVSs) have been investigated by double resonance modulation (DRM) microwave spectroscopy in the range from 12 GHz to 40 GHz, and by millimeterwave spectroscopy in the range from 90 to 260 GHz. In addition to the GS spectrum, rotational transitions have been observed for the EVSs v 10 = l, and 2, v 12 = l, v 6 = l, v n = l, v 4 = l, and v 9 = l. Along with other IR bands up to 1400cm" 1 , the fundamental vibrational band v 10 = l <-0 has been observed by FT-IR spectroscopy and has been analysed to yield v° 0 = 436.8851 cm -1 . Rotational constants and quartic distortion constants were deduced for all observed states. In addition, sextic distortion constants were obtained for the GS and for the EVSs v 10 = l, 2, v 6 = l, and v 12 = l by computer fits of combined microwave and millimeterwave data to Watson's A-re-duced Hamiltonian in I r representation. The S-reduced Hamiltonian in III r representation may be considered more appropriate for the calculation or the fitting of the transitions because 1,1-DFE is a near oblate asymmetric top. Thus, for comparison, results are given for both the A-and the S-reduction. 
  Reference    Z. Naturforsch. 51a, 53—62 (1996); received November 11 1995 
  Published    1996 
  Keywords    1, 1-Difluoroethylene, Molecular Spectroscopy, Microwave Spectroscopy, FT-IR Spec-troscopy, Excited Vibration States 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0053.pdf 
 Identifier    ZNA-1996-51a-0053 
 Volume    51 
71Author    W. Bodenmüller, M. Pfeffer, R. Ruber, B. Macht, A. RuoffRequires cookie*
 Title    High Resolution FTIR Spectroscopy of 1,3>5-Triazine*: The Parallel Bands v n and v 12 of 12 C 3 14 N 3 H 3 , 13 C 3 14 N 3 H 3 , 12 C 3 15 N 3 H 3 , 13 C 3 15 N 3 H 3 and 12 C 3 14 N 3 D 3  
 Abstract    The present contribution reports on the analysis of the high resolution FTIR spectra of the only two IR-active parallel fundamentals v u and v 12 of the isotopomers 12 C 3 14 N 3 H 3 , 13 C 3 14 N 3 H 3 , 12 C 3 15 N 3 H 3 , C 3 15 N 3 H 3 and 12 C 3 14 N 3 D 3 , respectively, of 1,3,5-triazine. The molecular con-stants of the ground state and the upper states u u = l and v l2 = \, respectively, for all molecules under consideration are listed. The enhancement of the P-and the depletion of the R-banches, observed in the v n bands of all non-deuterated isotopomers, is discussed, and the Herman-Wallis constants obtained are given. 
  Reference    Z. Naturforsch. 53a, 1 (1998); received December 10 1997 
  Published    1998 
  Keywords    High Resolution FTIR Spectroscopy, 1, 3, 5-Triazine, Parallel Band, Herman-Wallis Constants 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0001.pdf 
 Identifier    ZNA-1998-53a-0001 
 Volume    53 
72Author    Hans-Dieter Eßwein, Günter HäfelingerRequires cookie*
 Title    Bestimmung von Ringstromanisotropieeffekten im 1 H-NMR -Spektrum von 9-Phenylderivaten des 1.4-Dimethylanthracens und 1.4-Dimethyltriptycens Determination of Ring Current Anisotropy Effects in the X H NMR Spectra of 9-Phenyl Derivatives of 1,4-Dimethylanthracene and 1,4-Dimethyltriptycene  
  Reference    Z. Naturforsch. 33b, 1026—1032 (1978); eingegangen am 31. Mai 1978 
  Published    1978 
  Keywords    Ring Current, Anisotropy Effects, 1 H NMR, 9-Phenyl Derivatives, 14-Dimethylanthracene, 1, 4-Dimethyltriptycene 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1026.pdf 
 Identifier    ZNB-1978-33b-1026 
 Volume    33 
73Author    George Sosnovsky, GaryA. KarasRequires cookie*
 Title    Reactions of f-Butyl Peresters, XVI Reactions of Diakyl t-Butylperoxy Phosphates and Alkyl t-Butylperoxy Alkylphosphonates with Cycloalkenes in the Presence of Copper Ions  
  Reference    Z. Naturforsch. 33b, 1165—76 (1978); received June 20 1978 
  Published    1978 
  Keywords    2-Butylperoxy phosphates, 2-Butylperoxy phosphonates, 1, 3-Cyclodienes, Copper Ion Catalysis, Imidazolides 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1165.pdf 
 Identifier    ZNB-1978-33b-1165 
 Volume    33 
74Author    Reiner Luckenbach, Nikolaus MüllerRequires cookie*
 Title    Zur elektrocyclischen Ringöffnung von Cyclopropylhalogeniden bei der Reaktion mit Natriumiodid in Aceton Electrocyclic Ring Opening of Cyclopropyl Halides in the Course of their Reaction with Sodium Iodide in Acetone  
 Abstract    Reaction of cyclopropyl halides with sodium iodide in acetone [i.e. under typical Sis-2-conditions), proceeds via ring opening to allylic systems finally yielding 1,5-hexadienes upon dimerisation; ring-retained products were not detected. Application of the Wood-ward-Hoffmann rules lends strong support to a cationic synchronous mechanism. This is also confirmed by kinetic measurements proving this reaction to be first order over all. The kinetic data are shown to fit the Hammett equation using cr-values for cyclopropyl bromides and o + -values for geminal cyclopropyl dichlorides, respectively. The validity of the Woodward-Hoffmann-De Puyrule (according to which in synchronous reactions leaving groups situated endo are strongly favored over those situated exo) is tested in corresponding experiments involving condensed ring systems. I. Zum Problem der nukleophilen Substitution an Cyclopropylsystemen In der vorliegenden Arbeit werden die Reaktionen von 2-phenylsubstituierten Cyclopropylhalogeniden unter typischen SN2-Bedingungen (Umsetzung mit Natriumiodid in Aceton) untersucht. Zunächst 
  Reference    Z. Naturforsch. 34b, 464—480 (1979); eingegangen am 10. August/19. Dezember 1978 
  Published    1979 
  Keywords    Ring Opening, Woodward-Hoffmann Rules, Allylic Cations, Dimerisation, 1, 5-Hexadienes 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0464.pdf 
 Identifier    ZNB-1979-34b-0464 
 Volume    34 
75Author    UlrichW. GerwarthRequires cookie*
 Title    Borverbindungen, 12. Mitteilung Das Kristallisationsverhalten der Poly(2-phenyl-1.3.2-dioxabora-cycloalkane) Boron Compounds, Part 12 The Crystallizing Behaviour of Poly(2-phenyl-l,3,2-dioxybora-cycloalkanes)  
  Reference    Z. Naturforsch. 34b, 1084—1091 (1979); eingegangen am 4. April 1979 
  Published    1979 
  Keywords    1, 3, 2-Dioxybora-cycloalkanes, Ligand Exchange, Metathetic Rearrangement, Cyclic Oligomers, Thermal Analysis 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1084.pdf 
 Identifier    ZNB-1979-34b-1084 
 Volume    34 
76Author    Werner Winter, Hanspeter Bühl, Herbert MeierRequires cookie*
 Title    Structure Determination of 3,5-Biscyclohexylidene-l,2,4-trithiolane  
  Reference    Z. Naturforsch. 35b, 1015—1018 (1980); eingegangen am 14. März 1980 
  Published    1980 
  Keywords    Fragmentation of 1, 2, 3-Thiadiazoles, 1, 2, 4-Trithiolanes, X-ray 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1015.pdf 
 Identifier    ZNB-1980-35b-1015 
 Volume    35 
77Author    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 
78Author    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 
79Author    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 
80Author    Albini, H. KischRequires cookie*
 Abstract    Chromium and tungsten carbonyls react with 3,3,4,4-tetramethyl-l,2-diazetine (1) or its mono-N-oxide (2) to form complexes (l)M(CO)5, (l)2M(CO)4, (l)M2(CO)io, (l)2M2(CO)8, (l)3M2(CO)6 or (2)M(CO)5 and (2)2M(CO)4, resp. In the reactions of 2 some deoxygenation affords complexes of 1 as by-products. The stability of these and other complexes of the N=N group is related to the ring size of the cyclic diazene ligand. 
  Reference    Z. Naturforsch. 37b, 468—472 (1982); received November 13 1981 
  Published    1982 
  Keywords    I, 2-Diazetines, 1, 2-Diazetine-N-oxide, Chromium Complexes, Tungsten Complexes 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0468.pdf 
 Identifier    ZNB-1982-37b-0468 
 Volume    37