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1981 (332)
21Author    Syed Abuzar, Satyavan SharmaRequires cookie*
 Title    Synthesis of 6-N-Aryl and Heteroaryl Benzthiazoles as Potential Anthelmintics [1]  
 Abstract    A number of 6-substituted arylaminobenzthiazoles (5-8 and 16-18), 6-(substituted -1-benzimidazolyl)benzthiazoles (9-15) and 6-(3-quinazolyl)benzthiazoles (19) have been synthesized starting from corresponding 6-aminobenzthiazoles. None of the compounds showed significant anthelmintic activity. 
  Reference    (Z. Naturforsch. 36b, 108—111 [1981]; received August 1 1980) 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0108.pdf 
 Identifier    ZNB-1981-36b-0108 
 Volume    36 
22Author    GeorgiY. Papanov, PeterY. MalakovRequires cookie*
 Title    New Furanoid Diterpenes from Teucrium scordium L  
 Abstract    Two new furanoid diterpenes of clerodane type, 6-ketoteuscordin (1) and 6a-hydroxy-teuscordin (2) have been isolated from Teucrium scordium var. scordium, Lamiaceae. Their structures and stereochemistry have been determined. 
  Reference    (Z. Naturforsch. 36b, 112—113 [1981]; received July 14 1980) 
  Published    1981 
  Keywords    Teucrium scordium L, Lamiaceae, Clerodane Type, Furanoid Diterpene, 6-Ketoteuscordin 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0112.pdf 
 Identifier    ZNB-1981-36b-0112 
 Volume    36 
23Author    Elmar Flaskamp, Gerhard Nonnenmacher, Otto IsaacRequires cookie*
 Title    On the Diastereoisomerism of Natural and Synthetic a-Bisabolols  
 Abstract    a-Bisabolol, Vanillosmopsis erythropappa Matricaria chamomilla, Myoporum crassifolium, Populus balsamifera The stereochemistry of a-bisabolol is discussed. The chiralities of the different a-bisabolols from Myoporum crassifolium, Populus balsamifera and Vanillosmopsis erythropappa are deduced from the absolute configuration of natural bisabolol from chamomile, which has to be considered as being (l'S,2S)-configurated according to most recent investigations. Based on this assumption, (l'S, 2R)-configuration has to be ascribed to (—)-a-bisabolol from Myoporum crassifolium, whereas (l'R,2R)-resp. (l'S,2S)-structure is present in (-f)-a-bisabolol from Populus balsamifera and (—)-a-bisabolol from Vanillosmopsis erythropappa being therefore enantiomeric to the latter. Consequently, the (—)-a-bisabolols from Matricaria chamomilla and Vanillosmopsis erythropappa turn out to be identical in all respects. Synthetic a-bisabolols, however, featuring approximately equal amounts of all the four possible stereoisomers, differ not only optically but also in their stereochemical uniformity from natural a-bisabolols. By means of NMR spectrometric methods the identity of the native active agent can be established in chamomile specialities; as a consequence possible admixtures of synthetic racemates of a-bisabolol thus can be identified and quantified. 
  Reference    (Z. Naturforsch. 36b, 114—118 [1981]; eingegangen am 17. Juli 1980) 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0114.pdf 
 Identifier    ZNB-1981-36b-0114 
 Volume    36 
24Author    A. M. El-Khawaga, K. M. Hassan, A. A. KhalafRequires cookie*
 Title    Studies on Ferrocene Derivatives(VII). Synthesis of Some New Ferrocenyl Dibromides, Benzofuranes and Indoles  
 Abstract    Ferrocene Derivatives A series of ferrocenyl chalcones (1-7) have been prepared by the interaction of acetyl-ferrocene with aromatic aldehydes. Reaction of these ferrocenyl chalcones with hydrazines gave ferrocenyl pyrazolines (8—21). Also, the reaction of chalcones with bromine yielded the corresponding dibromides (22-25). Fusion of dibromides (22-25) with 2-naphthol and 1-naphthylamine gave the corresponding substituted ferrocenylbenzofuranes (26-29) and ferrocenyl endoles (30-33) respectively. 
  Reference    (Z. Naturforsch. 36b, 119—122 [1981]; received April 14 1980) 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0119.pdf 
 Identifier    ZNB-1981-36b-0119 
 Volume    36 
25Author    Hans Siebert, Walther JentschRequires cookie*
 Title    Rhombohedrally Crystallizing Zinc Hexacyanometalates(III) Zn3[M(CN)e]2  
 Abstract    The preparation of a non-cubic modification of water-free hexacyanometalates(III) Zn3[M(CN)6]2 (M = Cr, Fe, Co) is described. The X-ray powder diagrams of these compounds have been indexed rhombohedrally, space group Dgd-R"3c, Z = 2. 
  Reference    (Z. Naturforsch. 36b, 123—124 [1981]; eingegangen am 17. September 1980) 
  Published    1981 
  Keywords    X-ray, Zinc, Cyanometalates 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0123_n.pdf 
 Identifier    ZNB-1981-36b-0123_n 
 Volume    36 
26Author    H. Parlar+, Y. Inanici++Requires cookie*
 Title    Eine nicht erwartete intramolekulare Photoreaktion eines Hexachloroctahydrodimethanonaphthalins  
 Abstract    Photoreactions of 1,2,3,4,10,10-hexachloro-6,7-epoxy-l,4,4a,5,6,7,8,8a-octahydro-l,4-endo, endo-5,8-dimethano-naphthaline (1) were stud-ied in acetone with wavelengths above 290 nm. With the help of column chromatography an unusual isomerisation product (4) could be isolated, whose structure was established by spectral data obtained by mass spectrometry infrared spectroscopy, X H and 13 C nuclear magnetic resonance measurements. Hexachloroctahydrodimethanonaphthaline gehö-ren zu den bekanntesten Cyclodieninsektiziden, 
  Reference    (Z. Naturforsch. 36b, 125—126 [1981]; eingegangen am 12. August 1980) 
  Published    1981 
  Keywords    Photochemistry, Isomerisation Reactions, Hexachlorooctahydrodimethanonaphthalines 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0125_n.pdf 
 Identifier    ZNB-1981-36b-0125_n 
 Volume    36 
27Author    Rolf Appel, Karl WaidRequires cookie*
 Title    Darstellung von Natrium-Chelaten des Methylen-bis[iminodiphenylphosphorans] [1] Synthesis of Sodium-Chelates of Methylen-bis[iminodiphenylphosphorane] [1]  
  Reference    (Z. Naturforsch. 36b, 127—130 [1981]; eingegangen am 24. Oktober/27. November 1980) 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0127.pdf 
 Identifier    ZNB-1981-36b-0127 
 Volume    36 
28Author    Rolf Appel, Karl WaidRequires cookie*
 Title    Darstellung symmetrisch bisaminierter Carbodiphosphorane R2NPh2P=C=PPh2NR2 [1] Synthesis of Symmetrical Diaminocarbodiphosphoranes R2NPh2P=C=PPh 2 NR2 [1]  
 Abstract    The hitherto unknown symmetrical diamino carbodiphosphoranes R2NPh2P = C — PPh2NR2 (5 a-d (R = CH3, Et, nPr, nBu) are obtained in good yield by NaH dehydrohalogenation of the corresponding aminophosphonium salts R2NPh2P^CH^PPh2NR2-i+Cl-(3a-d). 3 a-d can be prepared by aminolysis of C(PPh2Cl)2 (1) or, more conveniently, directly in the three component reaction ditertiary phosphine/amine/CCU (31 P{ 1 H} and 13 C{ 1 H} NMR). 
  Reference    Z. Naturforsch. 36b, 131—134 (1981); eingegangen am 22. Mai 1980 
  Published    1981 
  Keywords    Carbodiphosphoranes, Diorganylamino Substitution, Ylid Reaction, 31 P NMR Spectra, 13 C NMR Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0131.pdf 
 Identifier    ZNB-1981-36b-0131 
 Volume    36 
29Author    Evamarie Hey, Ulrich MüllerRequires cookie*
 Title    Die Kristallstruktur von Methyltriphenylphosphoniumhexachlorotitanat [MePh3P]2TiCl6 The Crystal Structure of Methyltriphenylphosphonium Hexachlorotitanate  
 Abstract    Methyltriphenylphosphonium Hexachlorotitanate, Crystal Structure The crystal structure of [MePh3P]2TiCl6 was determined from X-ray diffraction data and refined to a residual index of R = 0.065. It crystallizes in the space group P2i/n with two formula units per unit cell; the cell dimensions are a — 921, b = 1314, c = 1648 pm and y — 100.87°. The TiClö 2-ion occupies an inversion center and has the shape of a slightly distorted octahedron with Ti-Cl distances between 233 and 235 pm. 
  Reference    Z. Naturforsch. 36b, 135—137 (1981); eingegangen am 10. November 1980 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0135.pdf 
 Identifier    ZNB-1981-36b-0135 
 Volume    36 
30Author    G. Peters, W. PreetzRequires cookie*
 Title    Darstellung und Charakterisierung von Tetrabutylammonium-Tetraiodooxotechnetat(V), (TBA) [TcOI4] Preparation and Characterization of Tetrabutylammonium Tetraiodooxotechnetate(V), (TBA)[TcOI4]  
 Abstract    Pure (TBA)[TcOIi] is prepared from (TBA)[TcOCl4] by ligand exchange reaction with Nal in acetone. The vibrational spectra indicate C4v symmetry for the complex ion. On excitation with the 514.5 nm line of an Ar-laser a resonance Raman spectrum is obtained showing v(TcO) = 996 cm -1 and four of its overtones, symmetrically surrounded by groups of bands arising as well from the sums as from the differences of frequencies with the other fundamentals. In contrast to the ligand exchange reaction the reduction of Tc04 _ with conc. HI yields products always contaminated with polyiodides. The extremely strong Raman scatterer (TBA)l3 is detected by a characteristic doublet at 111 and 116 cm -1 and even small amounts of it cover the Raman spectrum of (TBA)[TcOI4]. 
  Reference    Z. Naturforsch. 36b, 138—140 (1981); eingegangen am 17. November 1980 
  Published    1981 
  Keywords    Tetraiodooxotechnetate(V), Resonance Raman Spectra, IR Spectra, UV Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0138.pdf 
 Identifier    ZNB-1981-36b-0138 
 Volume    36 
31Author    Mechthild Vollmerhaus, Friedo HuberRequires cookie*
 Title    Reaktion von Hiallium(III)-carboxylaten mit Ketonen Reactions of Thallium(III) Carboxylates with Ketones  
 Abstract    Thallation, Ketones, Thallium(III) Acetate, Thallium(III) iso-Butyrate In the reaction of ketones RCOCH3 (R = CH3, C2H5, n-C3H7, i-C3H7, n-C4H9, i-C4H9, tert-C1H9) with thallium(III) acetate in methanol, thallation at CH3 or at a-C in R has been observed by NMR spectroscopy. J(203 / 205 T1-1 H) in RCOCH2X [X = Tl(OCOCH3)2] is nearly independent of R (ca. 1290 Hz), but in R'CHXCOCH3 (R' = H, CH3, C2H5) it increases with increasing chain length. RCOCH2X and R'CHXCOCH3 decompose to give the corresponding acetoxylated ketones, e.g. CH3COCH2OCOCH3. Analogous thallation products have been observed in the reaction of acetone and C2H5COCH3 with thallium (III) iso-butyrate. 
  Reference    Z. Naturforsch. 36b, 141—143 (1981); eingegangen am 17. November 1980 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0141.pdf 
 Identifier    ZNB-1981-36b-0141 
 Volume    36 
32Author    M. Veith, 0. RecktenwaldRequires cookie*
 Title    Cyclische Diazastannylene, X [1] Die Kristall-und Molekülstruktur eines Moleküls mit verzerrt-würfelförmigem Sn4N30-Käfig Cyclic Diazastannylenes, X [1] The Crystal and Molecular Structure of a Molecule with a Distorted Cube-Shaped SiLiNsO-Cage  
 Abstract    The crystal and molecular structure of (me3CN)3(me3A10)Sn4 has been determined from three-dimensional X-ray data (4-circle diffractometer, R — 0.048). The crystals are mono-clinic, space group P2i/c, with cell dimensions a = 1017.4(5), b — 1488.5(7), c = 1748(1) pm, jS—91.5(1)° and Z — 4. The molecules approach 3m point-symmetry and include a SruNsO-cage, the atoms occupying the corners of a distorted cube formed by two, differently sized, interpenetrating concentric tetrahedra of tin and nitrogen/oxygen atoms. The nitrogen atoms are attached to tert-butyl groups, whereas the oxygen atom of the cage acts as a base towards the aluminiumtrimethyl group. Typical bond distances and angles (mean values) are: Sn-N = 219.9, Sn-0 = 220.3 pm; N-Sn-N = 81.2°; N-Sn-0 = 79.0°; Sn-N-Sn = 98.8° and Sn-O-Sn -100.2°. 
  Reference    Z. Naturforsch. 36b, 144—149 (1981); eingegangen am 14. Oktober 1980 
  Published    1981 
  Keywords    Molecular Tin(II) Compounds, Iminostannylenes, Cubane-Like Cage, X-ray, Molecular Structure 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0144.pdf 
 Identifier    ZNB-1981-36b-0144 
 Volume    36 
33Author    Wolfgang KaimRequires cookie*
 Title    Zur Reaktion aromatischer Phosphanderivate mit Elektronen, I. On the Reaction of Aromatic Phosphane Derivatives with Electrons, I  
 Abstract    The compounds ;p-Me2P(X)-CeH4-P(X)Me2, X = O, S, Se, NPh undergo one-electron reduction at a mercury cathode or on reaction with solvated electrons in a K/18-crown-6/THF mixture. The radical anions formed are persistent and have been characterized by ESR. They may be described as complexes of the spin-bearing moiety £>-Me2P-C6H4-PMe2 r with the coordinated groups X. 
  Reference    Z. Naturforsch. 36b, 150—156 (1981); eingegangen am 15. August 1980 
  Published    1981 
  Keywords    Organophosphorus Compounds, Reduction to Radical Anions, ESR Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0150.pdf 
 Identifier    ZNB-1981-36b-0150 
 Volume    36 
34Author    Wolfgang Haubold, HansGünter Fehlinger, Gerhard FreyRequires cookie*
 Title    Diazaborolidyl -a Stable Substituent at Sulfur Nitrogen Compounds  
 Abstract    2-Chlor-diazaborolidine, [CH2-N(CH3)]2BC1 (5) and N-silylated sulfur nitrogen com-pounds with sulfur in the oxidation state + 4 or + 6 react to form the boranes 7-11 which are thermally stable compounds. Reactions with other chlorboranes like [(CH3)2N]2BC1, 
  Reference    Z. Naturforsch. 36b, 157—160 (1981); eingegangen am 19. September 1980 
  Published    1981 
  Keywords    Sulfur Nitrogen Compounds, Diazaborolidine, Haloboranes, Synthesis 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0157.pdf 
 Identifier    ZNB-1981-36b-0157 
 Volume    36 
35Author    Joachim Fuchs, Axel Thiele, Rosemarie PalmRequires cookie*
 Title    Strukturen und Schwingungsspektren des Tetramethylammonium -a -dodekawolframatosilikats und des Tetrabutylammonium-/?-dodekawolframatosilikats Structures and Vibrational Spectra of Tetramethylammonium a-Dodecatungstosilicate and Tetrabutylammonium /?-Dodecatungstosilicate  
 Abstract    Dodecatungstosilicates free of crystal water were prepared for the first time by using tetraalkylammonium as cation. The crystal structure of the tetramethylammonium a-dodeeatungstosilicate [N(CH3)4]4SiWi2C>4o (1) and tetrabutylammonium)S-dodecatungs-tosilicate, [N(C4H9)4]4SiWi204o (2) were solved by X-ray diffraction. (1) crystallizes tetragonal in the space group 14 with lattice parameters a = 14.642 A; c= 12.706 A; (2) orthorhombic, space group P2i2x2i with a = 29.277 A, b = 22.181 A and c = 15.381 A. The differences between the two isomeric heteropolyanions are discussed, especially the distances and angles between the tungsten atoms. Comparison of characteristic differences in the vibrational spectra permits the identifica-tion of the isomeric anions. 
  Reference    Z. Naturforsch. 36b, 161—171 (1981); eingegangen am 22. Oktober 1980 
  Published    1981 
  Keywords    Dodecatungstosilicates, Isomers, X-ray, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0161.pdf 
 Identifier    ZNB-1981-36b-0161 
 Volume    36 
36Author    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 
37Author    Gerhard Thiele, Klaus Brodersen, Herbert FrohringRequires cookie*
 Title    Über Cyanohalogenomercurate der Alkalimetalle On Cyanohalogenomercurates of Alkali Metals  
 Abstract    The reactions between Hg(CN)2 and HgX2 in aqueous solutions of alkali halides MX (M = Na, K, Rb; X = CN, Cl, Br, I) lead to mixed cyanohalogenomercurates. 
  Reference    Z. Naturforsch. 36b, 180—187 (1981); eingegangen am 29. Oktober 1980 
  Published    1981 
  Keywords    Cyanohalogenomercurates, Mercury Compounds, Cyano Complex, Crystal Structure 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0180.pdf 
 Identifier    ZNB-1981-36b-0180 
 Volume    36 
38Author    Klaus-Peter Jensen, DietrichK. Breitinger, Wolfram KreßRequires cookie*
 Title    Metallomethane, IV [1] Molekül-und Kristallstruktur von Bis(chloroquecksilber)metliaii CH2(HgCl)2 Metallomethanes, IV [1] Molecular and Crystal Structure of Bis(chloromercuri)methane CH2(HgCl)2  
  Reference    Z. Naturforsch. 36b, 188—194 (1981); eingegangen am 13. Oktober 1980 
  Published    1981 
  Keywords    Metallomethanes, Bis(halomercuri)methanes, Bis(chloromercuri)methane, Molecular Packing, Maximum Density Molecular Layers 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0188.pdf 
 Identifier    ZNB-1981-36b-0188 
 Volume    36 
39Author    KarlE. Schwarzhans, Alfons StueferRequires cookie*
 Title    Pt(n>-, Pd(II)-und Cu(II)-Komplexe mit dem 4.4.5.5-Tetramethylimidazolin-l-oxyl-2-m-pyridyl-3-oxid-Liganden Pt(II), Pd(II) and Cu(II) Complexes with the Ligand 4,4,5,5-Tetramethylimidazohne-l-oxyl-2-m-pyridyl-3-oxide  
 Abstract    Complexes with Radical Ligands The stable free radical 4,4,5,5-tetramethylimidazoline-l-oxyl-2-m-pyridyl-3-oxide has been prepared and used as a ligand in platinum(II), palladium(II) and copper(II) complexes. The magnetic moments and the EPR spectra of the complexes and the free radical have been investigated. The complexes show a considerable interaction between the nitroxyl radicals of the ligands. 
  Reference    Z. Naturforsch. 36b, 195—197 (1981); eingegangen am 22. Oktober 1980 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0195.pdf 
 Identifier    ZNB-1981-36b-0195 
 Volume    36 
40Author    Lothar Weber, Dorothee Vehreschild-Yzermann, Carl Krüger+, Gotthelf Wolmershäuser+@bulletRequires cookie*
 Title    ÜbergangsmetaU-Schwefelylid-Komplexe, XI [1] Struktur und Reaktivität von ^ 5 -Thiacyclohexadienyl-l-oxid-chrom-KompIexeii Transition Metal Sulfur Ylide Complexes, XI [1] Structure and Reactivity of 77 5 -Thiacyclohexadienyl-l-oxide Complexes of Chromium  
 Abstract    The X-ray crystal and molecular structure of tetraethylammonium-tricarbonyl-(3,5-diphenylthiacyclohexadienyl-l-oxide)chromate has been determined. This organo-metallic anion can be nitrosylated to yield neutral [7y 5 -C5H3(C6H5)2SO](CO)2(NO)Cr. Further carbonyl displacement in this compound is achieved by treatment with pyridin or phos-phanes in the presence of triethylamineoxide. 
  Reference    Z. Naturforsch. 36b, 198—204 (1981); eingegangen am 4. September 1980 
  Published    1981 
  Keywords    X-ray, 3, 5-Diphenylthiacyclohexadienyl-l-oxide, Nit rosy lation, Amineoxide Assisted Carbonyl Displacement 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0198.pdf 
 Identifier    ZNB-1981-36b-0198 
 Volume    36 
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