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81Author    FredR. Oschea, G. Ernot, H. Eckm, Anna, FrankW. Ellerb, Ekkehard Fluck0Requires cookie*
 Title    Ein neuer Heterocyclus  
 Abstract    , 2A3,4A5-[l,2,4]-O xadiphosphinin (2), als Ligand eines zw eikernigen Eisenkom plexes A New H eterocycle, 2A3,4A5-[l,2,4]-O xadiphosphinine (2), as L igand o f a Binuclear Iron C om plex Preparation and properties of a coordination compound are described, in which a carbonyl group in bis[(dicarbonyl)(/;;i-cyclopentadienyl)iron] is substituted by hitherto unknown octa-Af-methyl-2A',4A:i-[l,2,4]-oxadiphosphinine-2,4,4,6-tetramine (2). The 'H , '1P, and l3C NMR spectra are recorded and discussed in detail. The molecular structure of the iron complex 4 is described and interpreted. 
  Reference    Z. Naturforsch. 51b, 1725—1731 (1996); eingegangen am 27. Juni 1996 
  Published    1996 
  Keywords    [l, 2, 4]-Oxadiphosphinine, Binuclear Iron Complex, NMR Spectra, X-Ray 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1725.pdf 
 Identifier    ZNB-1996-51b-1725 
 Volume    51 
82Author    Phosphonio-Substituted Tetrahydro-, -Diphosphinines, -Azaphosphinines, Georg Jochem, Martin Schm, HeinrichN. Öth ', Alfred SchmidpeterRequires cookie*
 Title    Phosphonio-substituierte Tetrahydro-l,3-diphosphinine un(j Tetrahy dro-1,2,6-azad i phospli in i ne  
 Abstract    The bis(triphenylphosphonio)propenide cation 1 provides two reactive CH sites in 1,3-position and can be condensed with the bis(dichlorophosphanyl)methylene triphenylphos-phorane 2 or the bis(dichlorophosphanyl)aniline 3 to form cationic six-membered rings: A tetrahydro-1,3-diphosphinine (4) with three phosphonio or phosphoranediyl substituents in 2,4,6-position and a tetrahydro-1,2,6-azadiphosphinine (5) carrying two such substituents in 3,5-position. The bromide of the latter was used for an X-ray structure analysis. The P111 ring members of the cations 4 and 5 can be oxidized in two steps by elemental sulfur to give the monothioxo and dithioxo derivatives 6. 7 and 8, 9. respectively. A crystal of the mixed chloride/bromide of 8 was used for another X-ray structure analysis. 
  Reference    Z. Naturforsch. 51b, 1761—1767 (1996); eingegangen am 16. August 1996 
  Published    1996 
  Keywords    Dichlorophosphanyl Ylides and Amines, Cyclocondensation, Phosphorus Heterocycles, 1, 3-Diphosphinines, 1, 2, 6-Azadiphosphinines 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1761.pdf 
 Identifier    ZNB-1996-51b-1761 
 Volume    51 
83Author    Lothar BeyerRequires cookie*
 Title    Substituierte l,2,4-Thiadiazolium-dichloroaurate(I) und -tetra- chloroaurate(III) als Reaktionsprodukte von N-Thiocarbamoyl- benzamidinen mit TetrachIorogold(III)-Verbindungen  
 Abstract    Substituted 1,2,4-T hiadiazolium dichloroaurates(I) and -tetrachloroaurates(III) as Products o f the R eaction o f N -T hiocarbam oyl-benzam idines w ith Tetrachlorogold(III) Com pounds U w e Schröder3, R ainer R ichter3, Jürgen H artung3, U lrich A bram b, 
  Reference    Z. Naturforsch. 52b, 620—628 (1997); eingegangen am 12. März 1997 
  Published    1997 
  Keywords    1, 2, 4-Thiadiazoliumchloroaurates(I/III), Synthesis, X-Ray, EM Spectra, N-Thiocarbamoylbenzamidines 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0620.pdf 
 Identifier    ZNB-1997-52b-0620 
 Volume    52 
84Author    A. Rto, M. Aaninena, R. Ené, T. B. Oeré, Tristram Chivers0, M. Asood ParvezcRequires cookie*
 Title    Preparation and X-Ray Structure of 4-N,N'-Bis(trimethylsilyl)- amino-3,5-diisopropylphenylselenium Trichloride  
 Abstract    The reaction of SeCU or SeCF with /V,/V'-bis(trimethylsilyl)-2,6-diisopropylaniline occurs not at the nitrogen atom but by electrophilic aromatic substitution at C-4 of the phenyl ring to give [(CH3)3Si]2NC6 H2('Pr:)SeCl3, which crystallizes as the chloro-bridged dimer in the triclinic system, space group P i, a -10.2598(17), b = 13.665(3), c = 9.7838(10) A, a = 90.056(13), ß = 102.439(11), 7 = 70.922(14)°, V = 1262.3(4) A \ Z = 1. The dimer contains an essentially planar CUSe^-Cl^SeCU unit, with trans apical (Me3SihNC6H2('Pr)2 groups, resulting in approximately square pyramidal geometry at Se. The bridging Se-Cl distances are unequal at 2.587(2) and 2.749(2) A. 
  Reference    Z. Naturforsch. 54b, 1170—1174 (1999); received April 22 1999 
  Published    1999 
  Keywords    Crystal Structure, 2, 6-Diisopropylaniline, Aryl Selenium Trichloride, Bridging Chloride, NMR Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1170.pdf 
 Identifier    ZNB-1999-54b-1170 
 Volume    54 
85Author    R. Balamurali, K.J Rajendra PrasadRequires cookie*
 Title    A Facile Synthesis of Quino[2,3-fl]carbazoles  
 Abstract    Condensation of l-oxo-l,2,3,4-tetrahydrocarba-zoles la-e and o-aminoacetophenone 2 under acid catalysis afforded a new class of quino[2,3-a]car-bazoles 3a-e in good yields. A plausible mecha­ nism for the product formation is also proposed. 
  Reference    Z. Naturforsch. 54b, 1618—1620 (1999); received June 14 1999 
  Published    1999 
  Keywords    l-Oxo-l, 2, 34-tetrahydrocarbazole, o-Amino-acetophenone Condensation, Cyclisation, Aerial Oxidation 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1618_n.pdf 
 Identifier    ZNB-1999-54b-1618_n 
 Volume    54 
86Author    M. VeithRequires cookie*
 Title    Cyclische Diazastannylene, II 1 Intermolekulare Lewis-Säure-Base-Addukte bei 1.3.2.4A 2 -Diazasilastannetidinen Cyclic Diazastannylenes, II 1 Intermolecular Lewis-Acid-Base Adducts of 1, 3,2,4A 2 -Diazasilastannetidines  
 Abstract    -diazasilastannetidines can be prepared as mono-mers (organyl = <erf-butyl) or dimers (organyl = isopropyl) in nonpolar solvents, depending on the organic nitrogen substituent. The formation of the dimer, which is due to an intermolecular Lewis-acid-base interaction of Sn(II) with nitrogen, can be initiated by solidification. When the tertf-butyl compound is cooled below 0 °C two crystalline modi-fications are found: a monoclinic phase (C 2/c; a= 10.655(5); b = 24.75(1); c = 17.334(9) Ä; ß = 106.9(1)°) and a triclinic phase (P I; a = 10.68(1); b = 13.51(1); c = 12.36(1) A; a = 96.2(1); ß = 102.6(1); y = 118.4(1)°). The crystal structures turn out to be built of dimeric and monomeric units in the first case and presumably only dimeric species in the second case. The isopropyl derivative crystallizes in the space group P 2i/b (a = 10.77(1); b= 12.14(2); c = 11.15(2) A; ß = 120.2(2)°) with only dimeric units being present, as in the liquid. Interrelationships between the three structures are discussed. 
  Reference    (Z. Naturforsch. 33b, 1—6 [1978]; eingegangen am 5. September/6. Oktober 1977) 
  Published    1978 
  Keywords    Diazastannylenes, Solid State, X-ray, Crystal Structure, NMR l, 3-Diorganyl-2, 2-dimethyl-I, 3, 2, 4A 2 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0001.pdf 
 Identifier    ZNB-1978-33b-0001 
 Volume    33 
87Author    George Sosnovsky, Maria KoniecznyRequires cookie*
 Title    Utilization of the Sterically Hindered Base, 4-Hydroxy-2,2,6,6-tetramethylpiperidine, as a Hydrogen Halide Acceptor  
  Reference    Z. Naturforsch. 33b, 792—796 (1978); received March 17 1978 
  Published    1978 
  Keywords    Dehydrobromination, Preparation of Alkenes, Quaternization of Amines, Sterically Hindered Bases, 4-Hydroxy-2, 2, 6, 6-tetramethylpiperidine 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0792.pdf 
 Identifier    ZNB-1978-33b-0792 
 Volume    33 
88Author    MohamedHilmy Elnagdi, Mohamed Ezzat, KamalUsef Kandeel, SadekRequires cookie*
 Title    Reactions with Cyclic Amidenes III: Synthesis of Some New Fused Pyrazole Derivatives  
  Reference    Z. Naturforsch. 34b, 275—279 (1979); received August 28 1978 
  Published    1979 
  Keywords    Diazobetaienes, Dipolarcycloaddition, Pryazolo[4, 3-c]-l, 2, 3, 4-tetrazines, Ethoxycarbonyl Isothiocyanate, X H NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0275.pdf 
 Identifier    ZNB-1979-34b-0275 
 Volume    34 
89Author    W. Neuenhaus, H. Budzikiewicz, H. Korth, G. PulvererRequires cookie*
 Title    Bakterieninhaltsstoffe, III [1] 3-Alkyl-tetrahydrochinolinderivate aus Pseudomonas Bacterial Constituents, III [1] 3-Alkyl-tetrahydroquinoline Derivatives from Pseudomonas  
  Reference    Z. Naturforsch. 34b, 313—315 (1979); eingegangen am 18. September 1978 
  Published    1979 
  Keywords    Bacterial Constituents, Pseudomonas, Iron Defficiency Growth, Fluorescent Compounds, 3-Alkyl-3-hydroxy-2, 4-dioxo-l, 2, 3, 4-tetrahydroquinolines 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0313.pdf 
 Identifier    ZNB-1979-34b-0313 
 Volume    34 
90Author    Klaus-Wilhelm Stender, Günter Klar, Dierk KnittelRequires cookie*
 Title    Elektrochemisches Verhalten von Dibenzodichalkogeninen und verwandten Verbindungen Electrochemical Behavior of Dibenzodichalcogenins and Related Compounds  
  Reference    Z. Naturforsch. 40b, 774—781 (1985); eingegangen am 8. März 1985 
  Published    1985 
  Keywords    Thianthrenes, Selenanthrenes, 2, 2'-Dithiobiphenyls, Cyclic Voltammetry, 4, 4', 5, 5'-Tetramethoxy-2, 2'-dithiobiphenyl 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0774.pdf 
 Identifier    ZNB-1985-40b-0774 
 Volume    40 
91Author    D. Ieter Fenske, Christina Ergezinger, Kurt DehnickeRequires cookie*
 Title    Crystal Structure of l,l-D ichloro-3,5- diphenyl-4-H-l,2.4,6-/.4-selenatriazine, SeCl2C2N 3H (C 6H 5)2  
  Reference    Z. Naturforsch. 44b, 857—8 (1989); eingegangen am 15. Februar 1989 
  Published    1989 
  Keywords    1, l-D ichloro-3, 5-diph en yl-4-H -l, 2, 46-Ä4-selenatriazine, Preparation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/44/ZNB-1989-44b-0857_n.pdf 
 Identifier    ZNB-1989-44b-0857_n 
 Volume    44 
92Author    Ulrich Fenner, Hans Pritzkow, W. Alter, Siebert, HerrnRequires cookie*
 Title    Synthese und Komplexierung des 4.5-Cycloocta-2,3-dihydro-l,2,3-trimethyl-l,3-diborols  
 Abstract    Synthesis and Complexation of 4 ,5 -C y c lo o c ta -2 ,3 -d ih y d r o -l,2 ,3 -tr im e th y l-l,3 -d ib o r o le Redox reactions of cyclooctyne and l,l-bis(diiodboryl)ethane lead to 4,5-cycloocta-2,3-dihydro-l,3-diiodo-2-methyl-l,3-diborole (la), which is methylated with AlMe3 to give 4.5-cycloocta-2,3-dihydro-l,2,3-trimethyl-l,3-diborole (lb). Complexation of lb with the complex fragments (C5H5)Co, (C8H12)Ni, (C5H5)Ni, and (OC)3Co leads to the corresponding metal complexes 2 b, 3 b, 4 b, and 5 b. Their constitutions are derived from spectroscopic data and confirmed for 2 b and 4 b by X-ray structure analyses. 2 b contains a C -H -B 3 c /2 e bond, its hydrogen atom could be located. [(C8H12)Ni(lb)] (3 b) is the first example for a (C8H 12)Ni complex having a C -H -B interaction. 2,3-Dihydro-l,3-diborole sind aufgrund ihrer Lewis-Acidität sowie des Donorcharakters der C = C-Doppelbindung hervorragend als Komplex­ liganden geeignet [1]. Dabei fungiert der H etero-cyclus als Vier-und nach Abspaltung des W asser­ stoffatoms an C 2 als D rei-Elektronen-Donor. Eine bifaciale Koordination des 1,3-Diborolyl-Liganden führt zu Zwei-und M ehrkernkomplexen [2, 3] mit Stapelanordnung [4]. Zur Herstellung von 2,3-Dihydro-l,3-diborol-Derivaten haben wir m ehrere Synthesewege entwickelt, wobei Redox-Reaktio-nen zwischen Alkinen und l,l-Bis(diiodboryl)alka-nen die zentrale Rolle bei der Entwicklung dieser Heterocyclen-Chemie spielten. Es zeigte sich, daß der erste Schritt in einer Iodoborierung des Alkins unter Bildung von cis-und frarcs-Addition verläuft. Nur das ds-Produkt ist für die Redox-Reaktion unter Eliminierung von Iod und Bildung einer Bor-Kohlenstoff-Bindung geeignet. Bei Verwendung von Cycloalkinen wie Cyclooctin ist ausschließlich die Bildung von a's-l-Iod-2-boryl-cycloocten zu er­ warten, deshalb sollte die Bildung des Diborols gün­ stig verlaufen. Wir berichten hier über die Synthe­ se des neuen bicyclischen 1,3-Diborols l b und des­ sen Ligandeneigenschaften. * Sonderdruckanforderungen an Prof. Dr. W. Siebert. 
  Reference    Z. Naturforsch. 49b, 315—320 (1994); eingegangen am 15. Oktober 1993 4. 
  Published    1994 
  Keywords    5-Cycloocta-2, 3-dihydro-l, 2, 3-trimethyl-l, 3-diboroles, Cyclopentadienylcobalt, Cyclooctadienenickel, Cyclopentadienylnickel, Tricarbonylcobalt Complexes 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0315.pdf 
 Identifier    ZNB-1994-49b-0315 
 Volume    49 
93Author    M. Sekar, S. Vanitha, K. J. Rajendra, PrasadRequires cookie*
 Title    Synthesis of Novel 3-Acetyl-2-hydroxy-l-N,N-diacetylaminocarbazole Derivatives  
 Abstract    The synthesis of hitherto unknown 3-acetyl-2-hydroxy-l-N,N-diacetylaminocarbazole (3a-f), is reported. The hydroxyiminocarbazoles (2a-f), prepared from 1-oxo-1,2,3,4-tetra-hydrocarbazoles (la -f) on treatment with acetyl chloride in acetic anhydride yielded the title compounds (3a-f). 
  Reference    Z. Naturforsch. 49b, 687—690 (1994); received June 7/August 31 1993 
  Published    1994 
  Keywords    l-Hydroxyimino-l, 2, 3, 4-tetrahydrocarbazoles, 3-Acetyl-2-hydroxy-l-N, N-diacetylaminocar-bazoles, Aromatization, Thermal Fries Rearrangement, Antimicrobial Activities 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0687.pdf 
 Identifier    ZNB-1994-49b-0687 
 Volume    49 
94Author    Z. NaturforschRequires cookie*
 Title    Elektronentransfer und Ionenpaar-Bildung  
 Abstract    , 47 [1] Titrationen von 1,2,4,5-Tetracyanbenzol und 7,7,8,8-Tetracyan-/;-chino-dimethan mit Natriummetall in aprotischen Lösungen E le ctro n T ran sfer an d Ion P air F o rm atio n , 47 [ 1 ] T itratio n s o f 1,2 ,4 ,5 -T etracy an o b en zen e and 7 ,7 ,8 ,8 -T etracy an o -/?-q u in o d im eth an e w ith S o d iu m M etal in A p ro tic S o lu tio n s H an s B ock*, M a rk u s K leine 
  Reference    Z. Naturforsch. 51b, 1215—1221 (1996); eingegangen am 25. Januar 1996 
  Published    1996 
  Keywords    1, 2, 4, 5-Tetracyanobenzene, 7, 7, 8, 8-Tetracyano-/?-quinodimethane, Sodium Metal Reduction, UV/VIS Spectra 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1215.pdf 
 Identifier    ZNB-1996-51b-1215 
 Volume    51 
95Author    Ferdinand BelajRequires cookie*
 Title    Struktur von C2C16N4P2, dem R eaktionsprodukt von D icyandiam id mit PC15 Structure of C 2C16N4P2, the Reaction Product of Dicyandiamide with PC15  
 Abstract    The reaction product of dicyanodiamide with PC15 (1:2) is 2,2,4-trichloro-2,2-dihydro-6-trichlorophosphazeno-1.3,5,2A5-triazaphosphorine and not 2.4,6-trichloro-2,2-dihydro-2-trichlorophosphazeno-l,3,5,2A5-triazaphosphorine as reported in the literature. This is con­ firmed by an X-ray structure determination at 90K: Space group P 2,/c, a = 17.258(5), b = 9.664(3), c = 15.070(4) Ä, ß = 114.05(2)°, Z = 8, R = 3.99%. Both molecules of the asymmetric unit show about the same conformation with approximate C s-m -symmetry as was also obtai­ ned by semi-empirical MNDO calculations. The thermal motion analysis establishes that the molecules cannot be described as 'rigid bodies', and that the easy deformability of the exocyclic C-N-P angles allows the 'rigid' NPC13 tetrahedra to perform almost isotropic librations. 
  Reference    Z. Naturforsch. 51b, 1428—1432 (1996); eingegangen am 20. Februar 1996 
  Published    1996 
  Keywords    2, 24-Trichloro-2, 2-dihydro-6-trichlorophosphazeno-l, 3, 5, 2A5-triazaphosphorine Phosphaze­ ne, Crystal Structure, Thermal Motion Analysis 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1428.pdf 
 Identifier    ZNB-1996-51b-1428 
 Volume    51 
96Author    T. Koch, W. PreetzRequires cookie*
 Title    Darstellung, n B-, 13C -,1 H-NMR-und Schwingungsspektren  
 Abstract    von 2,2' -Bipyridylundecahydro-c/oso-dodecaborat(1-) sowie Kristallstruktur von (Ph4As)[(2,2-C10H8N2)B12Hn ] CH3CN Synthesis, n B, 13C, 'H NMR and Vibrational Spectra of 2 ,2 '-Bipyridyl-undecahydro-c/o5o-dodecaborate(l-) and Crystal Structure of (Ph4As)[(2 ,2 '-C10H8N2)B 12H 1 1 ]-CH3CN 
  Reference    Z. Naturforsch. 52b, 1165—1168 (1997); eingegangen am 17. Juli 1997 
  Published    1997 
  Keywords    2, 2'-Bipyridyl-undecahydro-c/oso-dodecaborate(l-), Crystal Structure, n B NMR Spectra, 1H NMR Spectra, 13C NMR Spectra, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1165.pdf 
 Identifier    ZNB-1997-52b-1165 
 Volume    52 
97Author    Z. NaturforschRequires cookie*
 Title    Ein weiteres 2A5,4A5-Diphosphapyridin: 2,2,4,4-Tetrakis-(dimethylamino)-6- amino-l-aza-2A5,4A5-diphosphinin  
 Abstract    A Further 2A5,4A5-Diphosphapyridine: 2,2,4,4-Tetrakis-(dimethylamino)-6-amino-1-aza-2A5,4A5-diphosphinine.-(dimethylamino)-6-amino-l-aza-2A5,4A5-diphosphinine (3) has been pre­ pared by reacting l,l,3,3-tetrakis(dim ethylam ino)-lA 5-3A:'-diphosphete (1) with bis(trimethyl-silyl)carbodiimide (2) in a 2 : 1 molar ratio. Properties, 'H, P, and l3C NMR, mass, and IR spectra are reported and discussed. Com pound 3 is further characterized by X-ray structure analysis. 
  Reference    Z. Naturforsch. 53b, 443—147 (1998); eingegangen am 12. Dezember 1997 
  Published    1998 
  Keywords    A5-Diphosphete, l-Aza-2A5, 4A5-diphosphinine, NMR Spectra, X-Ray Data 2, 2, 4, 4-Tetrakis 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0443.pdf 
 Identifier    ZNB-1998-53b-0443 
 Volume    53 
98Author    K. Shanm, K.J R Ajendra, PrasadRequires cookie*
 Title    Synthesis of 3-Phenylisoxazolo[3,4-a]carbazoles  
  Reference    Z. Naturforsch. 54b, 1202—1204 (1999); received April 19 1999 
  Published    1999 
  Keywords    l-Hydroxyimino-l, 2, 3, 4-tetrahydrocarbazoles, Claisen Aroylation, Aerial Oxidation, 3-Phenylisoxazolo[34-a]carbazoles 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1202.pdf 
 Identifier    ZNB-1999-54b-1202 
 Volume    54 
99Author    Marianne Baudler, Anna Marx, Josef HahnRequires cookie*
 Title    Beiträge zur Chemie des Phosphors, 80 [1] Über die Phosphor-Bor-Dreiringverbindung (f-BuP)2BN(i-Pr)2 Contributions to the Chemistry of Phosphorus, 80 [1] About the Phosphorus Boron Three-Membered Ring Compound (£-BuP)2BN(i-Pr)2  
  Reference    Z. Naturforsch. 33b, 355—360 (1978); eingegangen am 18. Januar 1978 
  Published    1978 
  Keywords    l, 2-Di-£e^butyl-3-di-iso-propylamino-l, 2, 3-diphosphaborirane, Heterocyclophosphanes, Three-membered Ring Compounds, Cyclo-3-bora-l, 2-diphosphanes, Diphosphaboracyclopropanes 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0355.pdf 
 Identifier    ZNB-1978-33b-0355 
 Volume    33 
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