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1978 (361)
181Author    HerbertW. Roesky, Georg SidiropoulosRequires cookie*
 Title    Arsenhaltige Heterocyclen Heterocycles Containing Arsenic  
 Abstract    In the reaction of N,N'-bis-trimethylsilyl-dimethylurea with As[N(CH3)2]3 a four membered ring 0 = C(NCH3)2AsN(CH3)2 1 could be isolated. 1 was not obtained by cleavage of the Si-N-bonds with the corresponding chloride. In contrast CH3N[CONCH3Si(CH3)3]2 reacts with AsCb to yield the six-membered ring CH3N(CON-CH3)2ASC1 2. The four-membered ring which contains an arsenic-halogen bond seems to be unstable. In the adamantane-type compound, AS4(NCH3)6, one methylamine could be eliminated by CF3SO3H to give AS4(NCH3)5(OS02CF3)2 3. X H, 19 F NMR as well as mass spectroscopy have been used in the characterization of the products obtained. 
  Reference    Z. Naturforsch. 33b, 756—758 (1978); eingegangen am 24. April 1978 
  Published    1978 
  Keywords    Cyclic Compounds, Arsenic, Small Rings 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0756.pdf 
 Identifier    ZNB-1978-33b-0756 
 Volume    33 
182Author    HerbertW. Roesky, Klaus AmbrosiusRequires cookie*
 Title    Über Reaktionen von 3-trifluormethylphenylsubstituierten silicium-und zinnorganischen Verbindungen Reactions of 3-Trifluoromethylphenyl Substituted Silicon and Tin Organic Compounds  
 Abstract    Several routes were investigated for the preparation of 3-CF3C6H4N[Si(CH3)3]2 2 and 3-CF3C6H4N[Sn(CH3)3]2 3. The latter compound reacts with 3-CF3C6H4NCO to yield [3-CF3C6H4(CH3)3SnN]2CO 4. A substituted urea 5 is also formed from [(CH3)3Si]2NCH3 and 3-CF3C6H4NCO. 5 is used for the preparation of cyclic compounds, with S2CI2 the ten-membered ring (3-CF3C6H4NCONCH3S2)2 6 is formed. 5 and HN(S02C1)2 yield the six-membered ring 3-CF3C6H4NC0NCH3(S02)2NH 7. SeOCl2 and 5 react under formation of a spiro compound (S-CFsCeHjNCONCHs^Se 8. The compounds were characterized on the basis of mass and 19 F NMR spectra. Am Beispiel des CF3S02N[Sn(CH3)3]2 und seiner 
  Reference    Z. Naturforsch. 33b, 759—762 (1978); eingegangen am 24. April 1978 
  Published    1978 
  Keywords    Fluoro Compounds, Cycles, Silicon, Tin, Metal Organic Derivatives 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0759.pdf 
 Identifier    ZNB-1978-33b-0759 
 Volume    33 
183Author    Cornelia Neidl, Joachim StauffRequires cookie*
 Title    Spectra and Decay Kinetics of Diadamantyl-Dioxetane Chemiluminescence  
 Abstract    The thermal decomposition of 1,2-diadamantyldioxetane was studied by kinetic and spectroscopic methods. Spectra of the chemiluminescence emitted during the thermally induced decomposition of 1,2-diadamantyldioxetane, tetramethyldioxetane and tri-methyldioxetane were obtained and the influence of quenchers and radical-scavengers, and the presence of "heavy atoms" in the surrounding of the emitting species was investigated. The kinetics of the decay mechanism was followed by measuring the time dependence of the chemiluminescence. The influence of radical-scavengers, quenchers and "external heavy atoms" on the kinetics was assessed. Experimental results were discussed in terms of a biradical decay mechanism. 
  Reference    Z. Naturforsch. 33b, 763—769 (1978); received January 26 1978 
  Published    1978 
  Keywords    Chemiluminescence, Dioxetanes, Reaction Kinetics, Spectra, Biradicals 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0763.pdf 
 Identifier    ZNB-1978-33b-0763 
 Volume    33 
184Author    J. Van Der Greef, N.M M Nibbering, H.-R Schulten, W. D. LehmannRequires cookie*
 Title    Fragmentation of the a-Amino Acid Methionine in Field Desorption Mass Spectrometry  
 Abstract    Field Desorption Mass Spectrometry, a-Amino Acid Methionine The fragmentation of methionine in field desorption mass spectrometry has been studied. Decomposition mechanisms are described which are based on stable isotope labelling, low and high resolution field desorption, and the application of field desorption kinetics. The combined use of these techniques for the study of some fundamental fragmentations in field desorption is demonstrated successfully. Further, a comparison with the fragmentation pattern of methionine under electron impact, chemical ionization and Curie point pyrolysis is given. 
  Reference    Z. Naturforsch. 33b, 770—781 (1978); received March 21 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0770.pdf 
 Identifier    ZNB-1978-33b-0770 
 Volume    33 
185Author    Krystyna Lesiak, WojciechJ. StecRequires cookie*
 Title    The Stereochemistry of P-N Bond Cleavage in the Staudinger -Wittig-type Reaction of 2-Anilido-3,4-dimethyl-5-phenyl-l,3,2-oxazaphospholidine-2-thiones  
 Abstract    Both isomers of 2-anilido-3,4-dimethyl-5-phenyl-l,3,2-oxazaphospholidine-2-thiones (2 a and 2 b) derived from (—)ephedrine were obtained and converted to corresponding 2-thiomethyl derivatives (3 a and 3 b). The Staudinger-Wittig-type reaction of P-N bond cleavage was found to proceed with full retention of configuration at P-atom involved into five-membered ring system. 
  Reference    Z. Naturforsch. 33b, 782—785 (1978); received March 28 1978 
  Published    1978 
  Keywords    1, 3, 2-Oxazaphospholidines, (—)Ephedrine, Thioanilides, Thioesters, Stereochemistry 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0782.pdf 
 Identifier    ZNB-1978-33b-0782 
 Volume    33 
186Author    Eberhard Bothe, Dietrich Schulte-FrohlindeRequires cookie*
 Title    Aqueous Solution  
 Abstract    The bimolecular decay of the hydroxymethylperoxyl radical in aqueous solution (k = 2.1 x 10 9 M _1 s _1) leads mainly (80%) to one molecule of hydrogen peroxid and to two molecules of formic acid. 2 HOCHsOO--> H202 + 2 HCOOH Deuterium kinetic isotope effects show that the decay occurs at room temperature via a short lived (t < 10 -4 s) tetroxid. 
  Reference    Z. Naturforsch. 33b, 786—788 (1978); received February 20 1978 
  Published    1978 
  Keywords    a-Hydroxymethylperoxyl Radical, Pulse Radiolysis, Conductivity, Oxydation of Methanol 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0786.pdf 
 Identifier    ZNB-1978-33b-0786 
 Volume    33 
187Author    PeterY. Malakov, GeorgiY. Papanov, NikolaM. Mollov, StefanL. SpassovRequires cookie*
 Title    Montanin-C, A New Furanoid Diterpene from Teucrium montanum L  
 Abstract    A new furanoid diterpene of clerodane type, Montanin-C (1) is isolated from the bitter fraction of the arial parts of Teucrium montanum L., spread in Bulgaria. Its structure is established on the basis of spectral evidance and chemical transformations. Furanoid diterpenes of clerodane and norclero-dane type are common in Teucrium species. 
  Reference    Z. Naturforsch. 33b, 789—791 (1978); received February 16 1978 
  Published    1978 
  Keywords    Teucrium montanum L, Labiatae, Clerodane Type, Furanoid Diterpene, Montanin-C 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0789.pdf 
 Identifier    ZNB-1978-33b-0789 
 Volume    33 
188Author    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 
189Author    George Sosnovsky, Maria KoniecznyRequires cookie*
 Title    Investigation of Inductive Effects on the Transphosphorylation Reaction of Spin-Labeled Phosphoryl Imidazolides, Part II  
 Abstract    The effect of electron-releasing and electron-withdrawing groups in the benzene ring of imidazolide 4 (R 1 = CH3, Cl, NO2) was studied. The 
  Reference    Z. Naturforsch. 33b, 797—804 (1978); received March 17 1978 
  Published    1978 
  Keywords    Spin-labeled Phosphates, Spin-labeled Phosphoroamidates, Nitroxyl Radical, Imidazole, Inductive Effects 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0797.pdf 
 Identifier    ZNB-1978-33b-0797 
 Volume    33 
190Author    I. Lüderwald, M. Przybylski, H. Ringsdorf, D. SilberhornRequires cookie*
 Title    Untersuchung yon Dipeptiden durch Elektronenstoß-und Felddesorptions-Massenspektrometrie Investigation of Dipeptides by Electron Impact and Field Desorption Mass Spectrometry  
 Abstract    The combined application of field desorption and electron impact ionization techniques in the mass spectrometry of free dipeptides can be used to obtaine informations about primary structure and molecular weight. Characteristic fragmentation pathways of dipeptides are discribed and the mechanism of diketopiperazine formation is discussed. 
  Reference    Z. Naturforsch. 33b, 805—808 (1978); eingegangen am 20. Januar 1978 
  Published    1978 
  Keywords    Electron Impact, Field Desorption Mass Spectrometry, Sequence Determination of Dipeptides, Diketopiperazine Formation from Dipeptides 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0805.pdf 
 Identifier    ZNB-1978-33b-0805 
 Volume    33 
191Author    I. Lüderwald, M. Przybylski, H. Ringsdorf, D. Silberhorn, H. Kaibacher, W. VoelterRequires cookie*
 Title    Untersuchung yon isomeren Tripeptiden und Derivaten des Thyrotropin-,Releasing" Hormons durch Elektronenstoß- und Felddesorptions-Massenspektrometrie Investigation of Isomeric Tripeptides and Thyrotropin-Releasing Hormone Derivatives by Electron Impact and Field Desorption Mass Spectrometry  
 Abstract    The complementary informations from field desorption and electron impact mass spectra of free tripeptides and thyrotropine releasing hormone derivatives can be used to determine primary structure and molecular weight. Characteristic and diagnostic frag-mentation pathways, the formation of diketopiperazines and the temperature-dependent tendency to form amine fragments and diketopiperazines will be discussed. 
  Reference    Z. Naturforsch. 33b, 809—817 (1978); eingegangen am 20. Januar 1978 
  Published    1978 
  Keywords    Mass Spectrometry, Sequence Determination, Isomeric Tripeptides, Thyrotropin-Releasing Hormone 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0809.pdf 
 Identifier    ZNB-1978-33b-0809 
 Volume    33 
192Author    Tse-Lok HoRequires cookie*
 Title    Deblocking of 2-Bromoethyl Esters via Thiazolium Salts  
 Abstract    Carboxylic acids are recovered from 2-bromo-ethyl esters by successive treatment with 4-methyl-5-thiazoleethanol, sodium bicarbonate followed by pyrolysis and quenching with dilute acid. 
  Reference    Z. Naturforsch. 33b, 818—819 (1978); received February 15 1978 
  Published    1978 
  Keywords    Carboxyl Protection, Cycloelimination, Pyrolysis, Sigmatropic Rearrangement 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0818_n.pdf 
 Identifier    ZNB-1978-33b-0818_n 
 Volume    33 
193Author    Erwin Brechtel, Gerhard Cordier, Herbert SchäferRequires cookie*
 Title    Neue ternäre Erdalkaliverbindungen des Arsens mit Mangan New Ternary Alkaline Earth Compounds of Arsenic with Manganese  
 Abstract    The new compounds CaMn2As2, SrMn2As2 and BaMn2As2 have been prepared and their struc-tures determined. The crystallographic data are (pm): CaMn.2As2: P3ml, a = 423 ± 1, c = 703 ± 1, c/a = 1.66 SrMri2As2: P3m 1, a = 429±l,c = 732 ± 1, c/a = 1.70 BaMn2As2: I4/mmm, a = 415 ± 2, c = 1347 ± 2, c/a = 3.24 
  Reference    Z. Naturforsch. 33b, 820—822 (1978); eingegangen am 17. April 1978 
  Published    1978 
  Keywords    Intermetallic Compounds, Crystal Structure, Ternary Arsenides 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0820_n.pdf 
 Identifier    ZNB-1978-33b-0820_n 
 Volume    33 
194Author    Klaus Volk, Wiking MüllerRequires cookie*
 Title    Darstellung und Struktur der Phase Li5Na2Sn4 Preparation and Crystal Structure of Li5Na2Sri4  
 Abstract    Alkali Stannide, Crystal Structure The new compound Li5Na2Sri4 crystallizes trigonally, a — 472.3 ± 1 pm, c = 7178 i 8 pm, space group R3m-D;}d. A quarter of the Sn atoms in the unit cell build up a puck-ered net of six-membered rings, another quarter is bound to the net-atoms forming a tetrahedral Sn coordination. The other half of the Sn atoms is ordered in layers of parallel Sn2 pairs. The nets and layers are separated by the alkali atoms. The structural relations to the variants of the W-structure type of compounds in the system Li-Sn and Na-Sn are shown. Einführung 
  Reference    Z. Naturforsch. 33b, 823—826 (1978); eingegangen am 2. Mai 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0823.pdf 
 Identifier    ZNB-1978-33b-0823 
 Volume    33 
195Author    Klaus Volk, Herbert SchäferRequires cookie*
 Title    Die Kristallstruktur von /3-NaSbS2 The Crystal Structure of ß-NaSbS2  
 Abstract    Alkalithioantimonites, Crystal Structure ß-NaSbS2 crystallizes monoclinically, C2/m, with a = 1284(2) pm, b = 582.5(8) pm, c = 581.3(3) pm, ß — 118.74(7)°. In the structure there are ^-SbSs-octahedra, which are connected by common edges to sheets separated by the Na ions. 
  Reference    Z. Naturforsch. 33b, 827—828 (1978); eingegangen am 26. Mai 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0827.pdf 
 Identifier    ZNB-1978-33b-0827 
 Volume    33 
196Author    Wilfried Klee, Herbert SchäferRequires cookie*
 Title    CaAl2Se4 und SrAl2Se4 — Strukturvarianten des TISe-Typs CaAl2Se4 and SrAl2Se4 -Variants of the TISe-Structure  
 Abstract    Ternary Selenides, Crystal Structure CaAl2Se4 and SrAl2Se4 have been prepared and their crystal structures determined. They crystallize orthorhombically, space group Cccm, with the lattice constants: CaAl2Se4: a = 633 ± 1pm, b = 1048 ± 1pm, c = 1053 ± 1pm; SrAl2Se4: a = 627 ± 1 pm, 6 == 1082 ± 1 pm, c = 1085 ± 1 pm. The structures of these compounds are closely related both to each other and to the TISe-structure. 
  Reference    Z. Naturforsch. 33b, 829—833 (1978); eingegangen am 20. Juni 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0829.pdf 
 Identifier    ZNB-1978-33b-0829 
 Volume    33 
197Author    W. S. Sheldrick, M.J C HewsonRequires cookie*
 Title    870 W. S. Sheldrick * Crystal and Molecular Structure of (Pentane-2,4-dionato)-tetrafluoropho  
 Abstract    X-ray, Hexa-coordinate Phosphorus Complex, Acetylacetone Chelate, 19 F NMR, 31 P NMR (Pentane-2,4-dionato)-tetrafluorophosphorane crystallises in the space group P2i/c, Z = 8, with a = 8.896(2), b = 13.760(4), c = 13.316(2) A, ß = 93.42(3)°. The structure was refined to R = 0.053 for 2445 reflections. Small but significant differences are observed in the bond angles at phosphorus and in the chelate ring conformations of the two indepen -dent molecules. These display an approximate mirror plane perpendicular to the chelate rings, which are in the boat form with P and C(3) displaced from the plane of the remaining ring atoms. The average P-0 distance of 1.719(2) A is similar to that for a cr-bond. 19 F and 31 P NMR and mass spectral data are reported. The basis peak is formed by the cleavage of the two P-0 bonds resulting in the ion PF4+ (m/e 107). 
  Reference    Z. Naturforsch. 33b, 834—837 (1978); received June 5 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0834.pdf 
 Identifier    ZNB-1978-33b-0834 
 Volume    33 
198Author    H. J. Keller, W. Moroni, D. Nöthe, M. Scherz, J. WeissRequires cookie*
 Title    und 5.10-Dihydro-5.10-diethylphenaziniumtriiodid  
 Abstract    Molecular and Crystal Structure of 5.10-Dihydro-5,10-dimethylphenaziniumtriiodide and 5,10-Dihydro-5,10-diethylphenazinium triiodide Oxidation of 5,10-dihydro-5,10-dimethylphenazine and 5,10-dihydro-5,10-diethyl-phenazine under different reaction conditions leads to several iodine containing solids. The preparation and X-ray structure of two of them, 5,10-dihydro-5,10-dimethyl-phenaziniumtriiodide (3) and 5,10-dihydro-5,10-diethylphenaziniumtriiodide (4) are reported here. Compound 3 crystallizes in space group P 2i/n with lattice parameters a = 8.552(6) A, b = 16.953(2) A, c= 12.157(9) A and ß= 103.46(2)° with four formula units in the unit cell. The structure was refined to an i?-value of 0.046 using 2387 independent reflections. The lattice constains distinct, slightly distorted triiodide ions and bent 5,10-dihydro-5,10-dimethylphenazinium radical cations. Compound 4 crystallizes in the same space group P2i/n with lattice parameters a = 8.531(6) A, b = 8.332(21) A, c = 13.320(15) A and ß— 94.44(19)° with two formula units in the unit cell. The structure was refined to an i?-value of 0.076 using 1195 independent reflections. The lattice contains strictly linear symmetrical triiodide ions and planar centrosymmetrical 5,10-dihydro-5,10-diethyl-phenazinium radical cations. 
  Reference    Z. Naturforsch. 33b, 838—842 (1978); eingegangen am 27. April 1978 
  Published    1978 
  Keywords    Radical Cations, Structure, ESR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0838.pdf 
 Identifier    ZNB-1978-33b-0838 
 Volume    33 
199Author    H. Endres, H. J. Keller, H. Van De Sand, Vu DongRequires cookie*
 Title    Crystal and Molecular Structure of a New Linear Chain Compound: Bis(diphenylglyoximato)platinum(III)perchlorate  
 Abstract    Platinum(III) Compound, Structure The reaction of bis(diphenylglyoximato)platinum(IV) diiodide with AgClC>4 in benzene yields red brown needles of the compound bis(diphenylglyoximato)platinum(III) Per-chlorate (A) and crystals of bis(diphenylglyoximato)platinum(III) Perchlorate which contains additionally between one and one and a half moles of benzene per formula unit (B). Both compounds are highly hygroscopic and instantaneously change their color to black-green in a humid atmosphere. Crystals of A are tetragonal, a = 20.325(2), c — 6.519(4) A, space group D|h-P4/ncc, Z = 4. The structure consists of stacks of [Pt(dpg)2] + cations with equidistant Pt-Pt separations of 3.259(4) A. The Perchlorate ions are dis-ordered in channels formed by the cation columns. Crystals of B are triclinic, a = 14.29(3), b = 13.54(2), c -10.34(3) A, a = 85.2(2), ß = 113.2(2), y = 93.9(2)°. 
  Reference    Z. Naturforsch. 33b, 843—848 (1978); received May o 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0843.pdf 
 Identifier    ZNB-1978-33b-0843 
 Volume    33 
200Author    Ekkehard Lindner, Hans LesieckiRequires cookie*
 Title    Das Verhalten von (Halogen)Acyldiphenylphosphinen gegenüber molekularem Sauerstoff in Abhängigkeit vom Acylrest Behavior of (Halogeno) Acylphosphines Towards Molecular Oxygen in Dependence of the Acyl Residue  
 Abstract    The halogenated acylphosphines RC(0)PPh2 (la-f) [R = C1CH2 (a), FCH2 (b), F2CH (c), C2F5 (d), C3F7 (e), CöFö (f)], which can be oxidized by rigorously dried oxygen to the phos-phine oxides RC(0)P(0)Ph2 (2a-f), are obtained by reaction of NaPPh2 with the acyl chlorides RC(0)C1. From 2a-f and stoichiometric amounts of water the alcohols RC[Ph2P(0)]20H (3a-f) are formed. While 3c-f are isomerized into the phosphinates RC[Ph2P(0)][0P(0)Ph2]H (4c-f), the alcohols 3a, b are stable. The hydrolytic and thermal behavior of the phosphine oxides 2 and the alcohols 3 are discussed regarding the nature of the acyl residue. 
  Reference    Z. Naturforsch. 33b, 849—854 (1978); eingegangen am 13. Juni 1978 
  Published    1978 
  Keywords    Acylphosphines, Acylphosphine Oxides, Phosphorylated Alcohols, IR, 31 P{ 1 H}NMR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0849.pdf 
 Identifier    ZNB-1978-33b-0849 
 Volume    33 
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