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1981 (332)
141Author    Ertugrul Arpac, Lutz DahlenburgRequires cookie*
 Title    Oligophosphin-Liganden, III [1] Bis(3-diphenylphosphinopropyl)phenylphospbinchloroiridium(I) * * und dessen Carbonyl-und Hydridderivate Oligophosphine Ligands, III [1] Bis(3-diphenylphosphinopropyl)phenylphosphinechloroiridium(I) and its Carbonyl and Hydride Derivatives  
 Abstract    The title complex, IrCl(bdpp) (1), where bdpp = PhP[(CH2)3PPh2]2, has been obtained from [IrCl(C8Hi4)2]2 and the triphosphine ligand. Characteristic 31 P NMR data of 1 dissolved in THF are <5(PPh2) = 2.7 and <3(PPh) = —19.9 with cis-2 J(PIrP) = 32.8 Hz. Reaction of 1 with CO proceeds stepwise to yield five-coordinate IrCl(CO)(bdpp) (2) and ionic [Ir(CO)2(bdpp)]Cl (3). A trigonal bipyramidal geometry with equatorial CO ligands is assigned to the cation of 3 on the basis of its v(CO) infrared intensities. When allowed to react with HCl, 1 gives the monohydride IrHCl2(bdpp) (4). Similarly, the dihydride IrH2Cl(bdpp) (5) is formed from 1 and H2. As has been established by IR and NMR spectroscopy, 4 and 5 adopt cis-wer-octahedral structures. 
  Reference    Z. Naturforsch. 36b, 672—676 (1981); eingegangen am 9. März 1981 
  Published    1981 
  Keywords    Bis(3-diphenylphosphinopropyl)phenylphosphine, Iridium Complexes, NMR Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0672.pdf 
 Identifier    ZNB-1981-36b-0672 
 Volume    36 
142Author    Mit Alkylderivaten Von Bor, GalliumUnd Aluminium, Indium, Wolfgang KaimRequires cookie*
 Title    Koordinationsverbindungen des reduzierten Pyrazins  
 Abstract    The alkyls MR3 (M = B, AI, Ga, In) react with pyrazine (Pz) and sodium in THF to yield persistent radical complexes Pz(MR2)2 ,+ MR4~ (1). Use of TIR3 leads to rapid deposi-tion of thallium metal. The formation of these ionic complexes 1 is the result of MR3 dissociation into +MR2 and -MR4 ions. All radicals have been identified and characterized by ESR; the data reveal the influence of N3B back bonding in the boron derivative. 
  Reference    Z. Naturforsch. 36b, 677—682 (1981); eingegangen am 6. März 1981 
  Published    1981 
  Keywords    Pyrazine, Alkali Metal Reduction, Group III Alkyls, Radical Complexes, ESR Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0677.pdf 
 Identifier    ZNB-1981-36b-0677 
 Volume    36 
143Author    Karl Wieghardt, Udo QuilitzschRequires cookie*
 Title    Zum Bildungsmechanismus von Vanadium Nitrosyl-Komplexen aus Hydroxylamin: Reversible, intramolekulare Umwandlung eines Nitrosylliganden in einen Hydroxylamido(l —)-Liganden On the Mechanism of the Formation of Nitrosylvanadium Complexes from Hydroxylamine: Reversible, Intramolecular Conversion of Coordinated Nitric Oxide to a Hydroxylamido(l—) Ligand  
 Abstract    Nitrosyl-and Hydroxylamido(0,N) Complexes of Vanadium, Mechanism of Formation The kinetics and the mechanism of a reversible, intramolecular conversion of a co-ordinated nitrosyl ligand into a probably 0,N-coordinated hydroxylamido(1—) ligand is reported for the complex anion [V(tha)(N0)(H20)]~ (tha = l,l',l"-nitrilo-tris-2-propanol). Mechanisms for the formation of nitrosyl complexes of the type {V-N=0} 4 generated from hydroxylamine and complexes of vanadium in the oxidation states + V or + III, respectively, are proposed. 
  Reference    Z. Naturforsch. 36b, 683—686 (1981); eingegangen am 16. März 1981 
  Published    1981 
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 Identifier    ZNB-1981-36b-0683 
 Volume    36 
144Author    Günther EulenbergerRequires cookie*
 Title    Tl2Sn2S5, a Thallium(I) Thiostannate(IV) with Fivefold Coordinated Tin  
 Abstract    The new compound Tl2Sn2Ss was prepared by fusion of a stoichiometric mixture of the elements followed by prolonged heating at 300 °C. The compound crystallizes in the monoclinic system in space group C2/c with lattice constants a — 11.115(2), 6 = 7.723(1), c = 11.492(2) A, and ß = 108.60(1)° (Z = 4). The Sn atoms are coordinated by five S atoms forming a considerably distorted trigonal bipyramid (mean distance Sn-S: 2.497 Ä). By common edges the SnSö bipyramids are linked into chains extending in the [110] and [1T0] directions, respectively. The chains are cross-linked by sharing the remaining equatorial vertices of the SnSs bipyramids, thus forming a three-dimensional framework which is related to that described for NajS^Sg [1]. The T1 atoms located in channels running parallel to the b axis are surrounded by nine S atoms. The distances Tl-S vary from 3.073 to 3.897 A. 
  Reference    Z. Naturforsch. 36b, 687—690 (1981); eingegangen am 10. März 1981 
  Published    1981 
  Keywords    Ternary Thallium Sulfide, Thiostannate, Crystal Structure, Trigonal Bipyramidal Coordination 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0687.pdf 
 Identifier    ZNB-1981-36b-0687 
 Volume    36 
145Author    Karl-Peter Steinfeldt, Gert Heller, Reinhard BaumertRequires cookie*
 Title    Untersuchungen über den Verlauf der Hydrolyse einiger Borsäurealkylester und den Nachweis von Zwischenprodukten Investigations on the Course of the Hydrolysis of Some Tris(alkoxy)boranes and the Identification of Intermediates  
 Abstract    Hydrolysis, Tris(alkoxy)boranes, Bis(alkoxy)hydroxyborane, Alkoxydihydroxyborane, Raman Spectra In the course of the hydrolysis of tris(alkoxy)boranes B(0R)3 (R = methyl, n-butyl, or 2-ethylhexyl) with a small amount of water in organic solvents, both possible intermediates (R0)2B0H and R0B(0H)2 have been unambiguously identified by Raman spectroscopic measurements. Lines have been found for (CH30)2B0H at 772.8 cm -1 and for CH30B(0H)2 at 814.6 cm -1 . The compounds are in equilibrium with the starting material B(OCH3)3 and the product B(OH)3. Potentiometrie and conductometric investigations likewise indicate the existence of these species. A mechanism of the hydrolysis reaction is based on kinetic considerations. With hydroxide ions in non-aqueous solvents or aqueous hydroxide ions the hydrolysis reactions occur differently because in the first case the end product of the hydrolysis is the orthoborate ion [B(OH)4] -, whereas in the second case in concentrated aqueous solutions poly borates are formed. 
  Reference    Z. Naturforsch. 36b, 691—696 (1981); eingegangen am 17. März 1981 
  Published    1981 
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 Identifier    ZNB-1981-36b-0691 
 Volume    36 
146Author    S. P. Perlepes, ThF. Zafiropoulos, J. K. Kouinis, A. G. GalinosRequires cookie*
 Title    Lanthanide(III) Complexes of Oxamic Acid  
 Abstract    The preparation, for the first time, of the deprotonated complexes of oxamic acid with Ce(III), Pr(III), Nd(III), Sm(III), Eu(III), Dy(III), Ho(III) and Yb(III) is reported. Properties, analytical results, conductometric measurements, magnetic moments and spectral data (IR and diffuse reflectance spectra) are discussed in terms of possible struc-tural types and the nature of the bonding. Oxamic acid acts as a bidentate non-bridging ligand. 
  Reference    Z. Naturforsch. 36b, 697—703 (1981); received February 17 1981 
  Published    1981 
  Keywords    Oxamato Complexes, Lanthanide(III) Complexes, Primary Amide 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0697.pdf 
 Identifier    ZNB-1981-36b-0697 
 Volume    36 
147Author    Roland Köster, Bernd WrackmeyerRequires cookie*
 Title    0 B-, n B-, 13 C-NMR-Untersuchungen von c/oso-Pentaalkyl-1.5-dicarbapentaboranen(5)  
 Abstract    closo-l,5-Dicarbapentaboranes(5), 13 C NMR Spectra, n B NMR Spectra NMR parameters [chemical shifts (<5 U B, <5 13 C) and coupling constants (1 J(13 C 1 H), 1 J(13 C 11 B), iJpC^C), 1 J(11 B 11 B)] of cZoso -pentaalky 1 -1,5-dicarbapentaboranes(5) were determined by 10 B, n B, and 13 C NMR spectroscopy. The magnitudes of 1 J(13 C 11 B) and ij(i3Ci3C) correspond to 1 J(11 B 1 H), X J(13 C n B) and 1J(13 C1H) in the parent compound 1,5-C2B3H5. According to predictions from MO calculations 1 J(11 B 11 B) was found to be <10 Hz. Together with these data the <5 U B and d 13 C values show that neither the structure nor the bonding situation in the polyhedron are significantly affected by alkyl substitution. 
  Reference    Z. Naturforsch. 36b, 704—707 (1981); eingegangen am 6. März 1981 
  Published    1981 
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 Identifier    ZNB-1981-36b-0704 
 Volume    36 
148Author    Herbert Schumann, Heinrich NeumannRequires cookie*
 Title    Organometallphosphin-substituierte Übergangsmetallkomplexe, XXVII [1] Reaktionen von Pentacarbonylmangan-und Pentacarbonylrheniumbromid mit Organoelement(rVb)phosphinen Organometalphosphine-Substituted Transition Metal Complexes, XXVII [1] Reactions of Pentacarbonylmanganese-and Pentacarbonylrheniumbromide with Organoelement(IVb) Phosphines  
 Abstract    The reactions of pentacarbonyl manganese bromide and pentacarbonyl rhenium bromide with di(ter£-butyl)trimethylsilyl phosphine, teri-butyl-bis(trimethylsilyl)-, -(germyl)-, -(stannyl) phosphine, as well as with tris(trimethylsilyl)-, -(germyl)-, and -(stannyl) phosphine result in the elimination of one CO ligand and the formation either of corresponding bromo-tetracarbonyl(organometalphosphine)manganese or -rhenium complexes or of corresponding octacarbonyl-bis(/z-organometalphosphido)dimanganese or -dirhenium complexes. The IR, NMR, and Mössbauer spectra are reported and discussed. 
  Reference    Z. Naturforsch. 36b, 708—712 (1981); eingegangen am 27. Februar 1981 
  Published    1981 
  Keywords    Organometal Phosphines, Tetracarbonylmanganese Complexes, Tetracarbonylrhenium Complexes, NMR Spectra, Mössbauer Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0708.pdf 
 Identifier    ZNB-1981-36b-0708 
 Volume    36 
149Author    Leopold Horner, Engelbert PliefkeRequires cookie*
 Title    Die Autoxidation von metallischem Kupfer und Kupfer(I)-Verbindungen Investigation on Autoxidation of Metallic Copper and Copper(I) Compounds by Different Methods  
 Abstract    The corrosion of copper granules under controlled conditions (2.5% NaCl solution, pH 4 buffer, Og) was studied using a) the rate of uptake of oxigen and b) the pH stat method. Cu 2+ ions catalyse the corrosion of copper. The surface area of the copper and the temperature influence the rate of corrosion in the expected manner. Experiments in light and dark showed little variation in the results. The results obtained by measuring the O2 uptake and using the pH stat method were confirmed and complemented by electrochemical measurements. (Steady potential/time curves, current/voltage curves, measurement of the polarisation resistance and estimation of Cu 2+ during corrosion via a Cu 2+ sensitive electrode.) The influence on the corrosion of F~, CI -, Br -and I~, mineral acid concentration and other inorganic ions was also studied under standard conditions. To ensure the correctness of the interpretation of the results (see reaction scheme), the autoxidation of CuCl and CU2O was also studied under standard conditions. The experimental results are consistent with the steps (l)-(4) in the reaction scheme. The fastest step is clearly the oxidation of Cu 1+ , which is continuously supplied via the copper surface. The interpretation here presented forms the basis for the understanding of the inhibition of corrosion exhibited by a number of organic compounds. 
  Reference    Z. Naturforsch. 36b, 713—720 (1981); eingegangen am 19. Dezember 1980 
  Published    1981 
  Keywords    Copper(I) Compounds, Autoxidation, Electrochemical Investigation 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0713.pdf 
 Identifier    ZNB-1981-36b-0713 
 Volume    36 
150Author    Hans-Dietrich Stachel, Hermann PoschenriederRequires cookie*
 Title    Stereoisomerie bei 5-Benzylidentetramsäuren Stereoisomerism of 5-Benzylidenetetramic Acids  
 Abstract    Alkylidenetetramic Acids, eis-trans Isomerisation N-Substituted (Z)-5-benzylidenetetramic acids undergo isomerisation to E/Z mixtures on treatment with acids or methylate. 
  Reference    Z. Naturforsch. 36b, 721—725 (1981); eingegangen am 7. Januar 1981 
  Published    1981 
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 Identifier    ZNB-1981-36b-0721 
 Volume    36 
151Author    ManNien Schuchmann, Clemens Von Sonntag, Yi-Hung Tsay, Carl KrügerRequires cookie*
 Title    Crystal Structure and the Radiation-Induced Free-Radical Chain Reaction of 2-Deoxy-/?-D-eryf/iro-pentopyranose in the Solid State  
 Abstract    Crystal Structure, 2-Deoxy-/?-D-en/£/iro-pentopyranose, Chain Reactions, Radiation Chemistry The crystal structure of 2-deoxy-ß-D-en/£/iro-pentopyranose (1) was reexamined by X-ray crystallographic studies. In crystalline 1, a radiation-induced chain reaction occurs with the only product being, 2,5-dideoxy-D-er^/tro-pentonic acid (4). In the chain propagating step leading to 4, an H atom is transferred over a distance of < 3.3 A as taken from interatomic distances in the unperturbed crystal. The crystal structure clearly indicates the direction by which the chain reaction proceeds through the crystal. The strong temperature dependence of G(4) is discussed in terms of temperature effects on chain initiation, propagation and termination rates. 
  Reference    Z. Naturforsch. 36b, 726—731 (1981); received February 9 1981 
  Published    1981 
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 Identifier    ZNB-1981-36b-0726 
 Volume    36 
152Author    DailW. Mullins, JamesC. LaceyRequires cookie*
 Title    Phosphate Production and Analysis in the Non-Enzymatic Activation of Amino Acids by ATP when Using Hydroxylamine as a Trapping Agent  
 Abstract    Phosphate Production, Hydroxylamine, ATP Saygin and Decker [6, 7] have reported that the formation of hydroxamic acids in solutions containing ATP, MgCl2, hydroxylamine and an acidic acceptor (acetic acid or amino acids) is not accompanied by the release of inorganic phosphate from ATP. Using an ion exchange chromatography method developed by Lowenstein [8] to separate the various components of such reaction mixtures, we now show that inorganic phosphate, as well as some pyrophosphate, is produced during incubation at 50 °C. Evidence is also presented to indicate that the failure of Saygin and Decker [6, 7] to detect phosphate is due to a total inhibition of their phosphate assay system by ATP. 
  Reference    Z. Naturforsch. 36b, 732—734 (1981); received January 26 1981 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0732.pdf 
 Identifier    ZNB-1981-36b-0732 
 Volume    36 
153Author    Harald Lehner, Corinna Krauss, Hugo ScheerRequires cookie*
 Title    Solvent Induced Circular Dichroism in Conformational Analysis: Bile Pigments  
 Abstract    The applicability of solvent induced circular dichroism (SICD) for the conformational analysis of bile pigments has been investigated. The S-(—)-ethyl lactate induced rotational strengths for octaethylbilindion (4) and its dihydroderivative 5 are remarkably high. Related compounds, e.g. the isomeric purpurines 1 and 2 and formyltripyrrinon 3 exhibit an optical activity which is smaller by more than one order of magnitude. 1-3 are essen-tially free from steric strain so that a flat arrangement of the chromophore is most likely. On the other hand the closed conformations of 4 and 5 experience considerable steric repulsion of their terminal rings, so that a helical topology is energetically favoured. This distinction is reflected in the magnitude of the SICD observed and demonstrates its applicability for the conformational analysis of bile pigments. 
  Reference    Z. Naturforsch. 36b, 735—738 (1981); received November 21 1980 
  Published    1981 
  Keywords    Solvent Induced Circular Dichroism, Conformation, Enantiomerization, Purpurines, Bilatrienes 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0735.pdf 
 Identifier    ZNB-1981-36b-0735 
 Volume    36 
154Author    Wolfgang Stadlbauer, Thomas KappeRequires cookie*
 Title    Benzoylierung an 3-8ubstituierten 4-Hydroxy-2-chinolonen und 4-Hydroxycumarinen Benzoylation of 3-Substituted 4-Hydroxy-2-quinolones and 4-Hydroxycoumarines  
  Reference    Z. Naturforsch. 36b, 739—744 (1981); eingegangen am 2. Februar 1981 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0739.pdf 
 Identifier    ZNB-1981-36b-0739 
 Volume    36 
155Author    Wolf-H Gündel, Helmut BerenboldRequires cookie*
 Title    Pseudobasen aus Chinolinium-Salz und Alkoxiden Pseudobases from Quinolinium-Salts and Aleoxides  
 Abstract    The quaternary 3-cyano-quinolinium salt (lb) reacts in aqueous buffer solution (pH 7.5-12) to oxy-di(1.4-dihydroquinoline) (7), which gives on addition of alcohols or oximes in high yields the alcoxy-dihydroquinolines (8 a-c) or dihydroquinolyl-oximethers (8d-f). 
  Reference    Z. Naturforsch. 36b, 745—749 (1981); eingegangen am 4. März 1981 
  Published    1981 
  Keywords    Quinolinium Salts, Pseudobases, Insertion Reaction 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0745.pdf 
 Identifier    ZNB-1981-36b-0745 
 Volume    36 
156Author    C. Sauer, U. SchwabeRequires cookie*
 Title    Selective Suecinylation of Adenosine Catalyzed by 4-Morpholine-N,N' -dicyclohexylcarboxamidine  
 Abstract    Adenosine, Succinyl Adenosine Derivatives, 4-Morpholine-N,N'-dicyclohexylcarboxamidine Succinyl derivatives of adenosine are synthesized by direct reaction with succinic anhydride catalyzed by 4-morpholine N,N'-dicyclohexylcarboxamidine under kinetic or thermodynamic conditions and partial hydrolysis. Derivatives obtained were N 6 -succinyl adenosine, N 6 ,5'-0-disuccinyl adenosine, 3'(2')-0-succinyl adenosine, N 6 ,3'(2')-0-di-succinyl adenosine and 3'(2'),5'-0-disuccinyl adenosine. The last three derivatives were crystallized and gave equilibrium mixtures of 2'-0-and 3'-0-isomers in aqueous solvents with the 3'-0-isomer prevailing. Differentiation of isomers was done by PMR. A mechanism for isomerisation is proposed. The products were purified by anion exchange chromato-graphy and desalting. The procedures are useful for pharmacological applications because of the purity and yield of products. 
  Reference    Z. Naturforsch. 36b, 750—754 (1981); received February 2 1981 
  Published    1981 
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 Identifier    ZNB-1981-36b-0750 
 Volume    36 
157Author    A. Hatanaka, T. KajiwaraRequires cookie*
 Title    Occurrence of trans-3-Hexenal in Thea sinensis Leaves  
 Abstract    trans-3-Hexenal, Tea Leaves, Linolenic Acid Based on a discovery of £rans-3-hexenal and participation of isomerases and non-enzymatic isomerizing factors, the biogenetic pathway of Zraws-2-hexenal (leaf aldehyde) and cis-3-hexenol (leaf alcohol) has been demonstrated. 
  Reference    Z. Naturforsch. 36b, 755—756 (1981); received October 23 1980 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0755.pdf 
 Identifier    ZNB-1981-36b-0755 
 Volume    36 
158Author    Hartmut Klein, Wittko Francke, WilfriedA. KönigRequires cookie*
 Title    Studien über Wespengift, I Niedermolekulare Bestandteile des Giftblasenextraktes von Paravespula vulgaris Studies on Wasp Venom, I Low Molecular Weight Constituents of Venom Sac Extracts from Paravespula vulgaris  
 Abstract    Low molecular weight constituents of 3400 venom sacs of Paravespula vulgaris were extracted with water, diluted acetic acid, and methanol. After conversion to volatile derivatives carbohydrates, amino acids, fatty acids, other constituents of phospho lipids, and biogenic amines were identified by gas chromatography and mass spectrometry. Quantitative analysis was achieved for amino acids by amino acid analysis and for glucose by an enzymatic assay. Results are discussed with regard to biosynthesis of wasp toxins and phylogenetic aspects of hymenopteran venoms. 
  Reference    Z. Naturforsch. 36b, 757—762 (1981); eingegangen am 11. Februar 1981 
  Published    1981 
  Keywords    Wasp Venom, Gas Chromatography, Mass Spectrometry 
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 Identifier    ZNB-1981-36b-0757 
 Volume    36 
159Author    J. Manzur, G. GonzálezRequires cookie*
 Title    Solvent Effects on the IR Spectra of N-Methylacetamide  
 Abstract    The solvent effect on the v(N-H) amide I and amide II IR bands of N-methylacetamide were investigated. The frequency shifts could be related to the solvent donor and acceptor num-bers by mean of a two parameters relationship that accounts for the mutual influence between the two interacting sites of the amide. 
  Reference    Z. Naturforsch. 36b, 763—764 (1981); received January 2 1981 
  Published    1981 
  Keywords    Solvent Effect, Amidic Bond, N-Methylacetamide, Hydrogen Bonding Interactions 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0763_n.pdf 
 Identifier    ZNB-1981-36b-0763_n 
 Volume    36 
160Author    M. Krishnaiah, L. Ramamurthy, P. Ramabrahmam, H. ManoharRequires cookie*
 Title    The X-ray Structure of gem-N3P3Cl4(NPPh3)2-Conformation of the NPPh3 Groups  
 Abstract    An X-ray crystallographic study of geminal tetrachlorobis(triphenylphosphazenyl)cyclotri-phosphazatriene reveals Type II conformation of both triphenylphosphazenyl groups with respect to the P-N ring. These results are consistent with 31 P NMR data. The phosphazene ring has a distorted chair conformation. 
  Reference    Z. Naturforsch. 36b, 765—767 (1981); received December 29 1980 
  Published    1981 
  Keywords    Tetrachlorobis(triph9nylphosphazenyl)-cyclotriphosphazatriene, X-ray, Crystal Structure, Triphenylphosphazenyl Group Conformation 
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 Identifier    ZNB-1981-36b-0765_n 
 Volume    36 
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