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1981 (332)
61Author    Wolfgang Holzbach, Karl Wieghardt, Johannes WeissRequires cookie*
 Title    Darstellung und Kristallstruktur von Bis-(N-Methylhydroxylamido(l-)-O.N)(N-methyl-N-oxo-dithiocarbamato-O.S)- oxo-molybdän(VI) Synthesis and Crystal Structure of Bis(N-methylhydroxylamido(l-)-0,N)- (N-methyl-N-oxo-cUthiocarbamato-0,S)-oxo-molybdenum(VI)  
 Abstract    Bis(N-methylhydroxylamido(l-)-0,N)(N-methyl-N-oxo-dithiocarbamato-0,S)-oxo-molybdenum(VI), Synthesis, Crystal Structure The reaction of [Mo02((CH3)HN-0)2] and N-methylhydroxylammoniumchloride in an aqueous suspension with CS2 yields red crystals of the analytical composition M0C4H14N3O4S2. The crystal structure has been determined by single crystal X-ray diffraction analysis. The compound crystallizes in the monoclinic space group P 2i/c, with cell constants a= 1333.2(3), 6 = 814.2(2), c = 2179.8(6) pm, ß = 105.42(2)°, and Z = 8. The final i?-value is 4.5% for 2965 unique reflexions. The structure consists of two crystallographically independent neutral complexes of molybdenum(VI). The geometry about the molybdenum is a distorted pentagonal bipyramid containing a terminal oxygen atom, two N-methylhydroxylamido(l-) ligands coordinated via the O-and N-atoms and an N-methyl-N-oxo-dithiocarbamato(2-) ligand forming a planar five membered ring with the molybdenum(VI) center (0,S-coordination). 
  Reference    Z. Naturforsch. 36b, 289—292 (1981); eingegangen am 17. November 1980 
  Published    1981 
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 Identifier    ZNB-1981-36b-0289 
 Volume    36 
62Author    Ulf Thewalt, Maria BurgerRequires cookie*
 Title    S4N4 und seine Derivate: Molekül-und Kristallstruktur von S6N4 2+ (FeCl4 — )2 S4N4 and its Derivatives: Molecular and Crystal Structure of SeN4 2+ (FeCl4 _ )2  
 Abstract    Thiodithiazyl Compound, Molecular Structure The reaction of FeCl3 with S4N4 in CH2CI2 at room temperature yields S6N4 2 +(FeCl4~)2 (A), among other products. Crystal data of A: Space group P2i/c, Z = 4, a — 12.090(4), 6= 11.745(3), c= 13.918(3) Ä, ß= 101.25(2)°. In its dimensions and its conformation the SßN4 2+ -cation in A agrees well with the SöN4 2+ -cation in other salts. There exists one close S---C1 contact between each of the S atoms of the central S4 ring in the cation and the neighbouring FeCLf anions (3.04 to 3.16 A; for comparison: the S--C1 van der Waals distance is 3.50 Ä). 
  Reference    Z. Naturforsch. 36b, 293—296 (1981); eingegangen am 8. Dezember 1980 
  Published    1981 
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 Identifier    ZNB-1981-36b-0293 
 Volume    36 
63Author    Ekkehard Lindner, JuanCarlos WuhrmannRequires cookie*
 Title    Synthese und Stabilisierung von (Benzoyl-und Pentafluorbenzoyloxy)diphenyIphosphan und Vergleich mit den entsprechenden isomeren Aroyldiphenylphosphanoxiden Synthesis and Stabilization of (Benzoyl-and Pentafluorobenzoyloxy)diphenylphosphane and Comparison with the Corresponding Isomeric Aroyldiphenylphosphane Oxides  
 Abstract    (Benzoyloxy)-and (pentafluorobenzoyloxy)diphenylphosphanes RC(0)0PPh2 (2a, b) [R = C6H5 (a), C6F5 (b)] can be obtained by reaction of ClPPh2 (1) with Na02CC6H5 and Ag02CCeF5, respectively [eq. (1)]. Oxidation of 2a with molecular oxygen yields (benzoyl-oxy)diphenylphosphane oxide (3a) [eq. (2)]. The complexes (0C)5CrPPh20C(0)R (oa, b) are formed by the action of Na2OCC6Hs and Ag02CC6Fs, respectively on (OC)5CrPPh2Cl (4) [eq. (3)]. The chemical and spectroscopical properties of the (aroyloxy)diphenylphosphanes (2 a, b) are compared with the corresponding aryldiphenylphosphane oxides. 
  Reference    Z. Naturforsch. 36b, 297—300 (1981); eingegangen am 28. November 1980 
  Published    1981 
  Keywords    (Pentafluoro)(benzoyloxy)diphenylphosphanes, Pentacarbonylchromium Complexes, IR Spectra, NMR Spectra 
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 Identifier    ZNB-1981-36b-0297 
 Volume    36 
64Author    Joseph Grobe, Heinz ZimmermannRequires cookie*
 Title    Elektrochemische Synthesen, VI [1]  
 Abstract    Elektrochemische Substitution der YIB-Hexacarbonyle M(CO)6 (M = Cr, Mo, W) Electrochemical Syntheses, VI [1] Electrochemical Substitution of VIB-Hexacarbonyls M(CO)6 (M = Cr, Mo, W) The electrochemical substitution of group VIB hexacarbonyls by solvent molecules and/or phosphane ligands is studied in some detail and is found to be a fruitful alternative preparative route to the well-known photochemical reaction. 
  Reference    Z. Naturforsch. 36b, 301—306 (1981); eingegangen am 24. Oktober 1980 
  Published    1981 
  Keywords    Electrochemical Synthesis, Metal Carbonyls, Substitution Products, Phosphane Ligands 
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 Identifier    ZNB-1981-36b-0301 
 Volume    36 
65Author    Klaus Büscher, Susanne Heuer, Bernt KrebsRequires cookie*
 Title    Alkoxohalogenotellurate(rV): Darstellung und Struktur von  
 Abstract    Tetraphenylpho8phonium-trichloro(dioxo-etliylen-0.0')tellurat(rV) Alkoxohalogenotellurates(IV): Preparation and Structure of Tetraphenylphosphonium Trichloro(dioxo-ethylene-0,0')tellurate(IV) Halogenotellurates, Crystal Structure, Trichloro(dioxoethylene-0,0')tellurate(IV), Inert Pair The deprotonated glycolate dianion (OCH2CH2O) 2 -is shown to react as a bidentate chelating ligand towards chalcogen(IV) halides. With TeCL, the anion TeCl3(C>2C2H4) _ is formed. According to a single crystal X-ray analysis of the tetraphenylphosphonium salt (P2x/c, a — 7.501, b — 26.328, c= 13.582 A, ß= 104.55°, Z = 4) Te is in a tetragonal pyramidal (rp octahedral) coordination with the alcoholate ligands in the apical (Te-0 1.919 A) and in one of the equatorial positions (Te-0 1.973 A), the Te-Cl bond lengths being between 2.495 and 2.590 A. The trans bond lengthening effect of the equatorial alcoholate ligand (i.e. the polarizing effect towards the lone pair) is unusually low. Vibrational spectra are reported. 
  Reference    Z. Naturforsch. 36b, 307—312 (1981); eingegangen am 10. Dezember 1980 
  Published    1981 
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 Identifier    ZNB-1981-36b-0307 
 Volume    36 
66Author    H. Mongeot, H. R. AtchekzaiRequires cookie*
 Title    Opening of the B10H10 2-Cage to Give B10H14  
 Abstract    Decaborane, Bis(diethylsulphide)decaborane, Decahydrodecaborate Cage Opening Decaborane B10H14 is formed by opening the B10H10 2-cage in strong acidic medium. The reaction must be carried out in the presence of an inert solvent which dissolves B10H14. The best yields (28%) are obtained when zinc dust is added to the reaction mixture. The conversions of BIQHIO 2-into B10H14 or BioHi2(Et2S)2 probably obey the same mechanism. 
  Reference    Z. Naturforsch. 36b, 313—314 (1981); received September 19 1980 
  Published    1981 
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 Identifier    ZNB-1981-36b-0313 
 Volume    36 
67Author    Hans-Otto Stühler, Joachim PickardtRequires cookie*
 Title    (^ 3 -Benzyl)(?? 4 -cyclooctadien)rhodiiim(I)-Komplexe (^ 3 -Benzyl)(^ 4 -cyclooctadiene)rhodium(I) Complexes  
 Abstract    (j^ 3 -Benzyl)(ry 4 -cyclooctadiene)rhodium(I) Complexes, Synthesis, X-ray Reactions of [(COD)RhCl]2 (2) (COD = 1,5-cyclooctadiene) with i-C3H7MgBr in ether and styrene or o-methylstyrene lead to formation of the complexes [(COD)Rh(^ 3 -7-methyl-benzyl)] (3) and [(COD)Rh(?j 3 -6,7-dimethylbenzyl)] (4), respectively. 4 was characterized by X-ray analysis. With ß-methylstyrene or allylbenzene [(COD)Rh(^ 3 -7-ethylbenzyl)] (5) is formed; the latter case leads to precedent isomerisation of allylbenzene to /3-methyl-styrene. On the other hand no ?j 3 -benzylrhodium complexes could be isolated by reactions of 2 with a-methylstyrene, 2,4-dimethylstyrene, 2,6-dimethylstyrene or 2,4,6-trimethyl-styrene. The steric reasons for this behaviour are discussed. 
  Reference    Z. Naturforsch. 36b, 315—321 (1981); eingegangen am 10. Dezember 1980 
  Published    1981 
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 Identifier    ZNB-1981-36b-0315 
 Volume    36 
68Author    Helmut Werner, Tri Ngo-Khae, Claus Friebel, Peter Köhler, Dirk ReinenRequires cookie*
 Title    Synthese und Eigenschaften von zwei  
 Abstract    , drei-und vierkernigen Übergangsmetallkomplexen mit den metallorganischen Chelatliganden [C5H5M{P(0Me)20}2] e (M = Ni, Pd) [1] Synthesis and Properties of Bi-, Tri-and Tetranuclear Transition Metal Complexes with the Organometallic Chelate Ligands [C5H5M{P(0Me)20}2] e (M = Ni, Pd) [1] The compounds C5H5M[{P(0Me)20}2H] and [C5H5M{P(0Me)20}2]Q (M = Ni, Pd; Q = NH4, Tl) react with metal acetylacetonates M'(acac)ra and metal chlorides M'Cln to give the tri-and tetranuclear complexes [C5H5M{P(0Me)20}2]reM' [n = 2 or 3; M' = Co(II), Cu(II), Zn(II), VO, Al(III), Cr(III), Fe(III)]. The mixed-ligand complexes [C5H5Ni{P(0Me)20}2]2Ni(NH3)2, [C5H5Ni{P(0Me)20}2]Ni(acac), [C5H5Pd{P(0Me)20}2]V0(acac), [C5H5M{P(0Me)20}2]Pd(2-RC3H4) (M = Ni, Pd; R = Me, Bu 4) and [C5HsNi{P(0Me)20}2]Rh(C8Hi2) are obtained following similar synthetic routes. Thermolysis of [C5H5Ni{P(0Me)20}2]2Ni(NH3)2 in vacuo leads to the trinuclear nickel complex [C5H5Ni{P(0Me)20}2]2Ni. The magnetic properties as well as the IR, NMR, UV and ESR spectra of the new organometallic chelate complexes are discussed. 
  Reference    Z. Naturforsch. 36b, 322—331 (1981); eingegangen am 22. Dezember 1980 
  Published    1981 
  Keywords    Nickelabis(phosphonates), Palladiabis(phosphonates), Acetylacetonate Analogues, 7r-Allyl Complexes 
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 Identifier    ZNB-1981-36b-0322 
 Volume    36 
69Author    Wolf-Walther Du Mont, Heinz-Jürgen KrothRequires cookie*
 Title    25 Te-NMR-Verschiebungen und Te-P-Kopplungskonstanten von Phosphantelluriden, Tellurophosphanen und Tellurophosphankomplexen 125 Te NMR Shifts and Te-P Coupling Constants of Phosphane Tellurides, Tellurophosphanes, and Tellurophosphane Complexes  
 Abstract    Tellurophosphanes, 125 Te NMR Spectra 125 Te NMR shifts and coupling constants 1 J(125 Te 31 P) of various types of Te-P com-pounds have been measured. 125 Te NMR singlets from R3P = Te/PR3 mixtures corroborate the rapid Te migration between tertiary phosphanes. Tellurophosphanes R—Te-PR^ give well-resolved doublets (R = p-tolyl, trimethylsilyl) or triplets (R = PR'2) due to 1 J(125 Te 31 P) coupling. Coordination of tellurophosphanes to metal carbonyls via the lone pair at phosphorus leads to downfield shifts of the 125 Te NMR resonances. Aufgrund der günstigen Kerneigenschaften von 
  Reference    Z. Naturforsch. 36b, 332—334 (1981); eingegangen am 15. Dezember 1980 
  Published    1981 
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 Identifier    ZNB-1981-36b-0332 
 Volume    36 
70Author    W. PetzRequires cookie*
 Title    Über die Reaktion von [(C0)4FeC(0)NMe2]-[C(NMe2)3] + mit einigen Diorganylbromboranen On the Reaction of [(C0)4FeC(0)NMe2]-[C(NMe2)3 + with Some Diorganoboron Bromides  
 Abstract    The carbamoyl complex [(C0)4FeC(0)NMe2][C(NMe2)3] (1) reacts with boron halides of the type BrBR2 (R = Me, Ph, NMe2) at low temperature to give the boroxycarben com-plexes 2, which decompose at ambient temperature to the aminoboranes 3 and Fe(CO)s. The NMR and IR spectra of the new compounds 2 are reported. 
  Reference    Z. Naturforsch. 36b, 335—338 (1981); eingegangen am 12. November 1980 
  Published    1981 
  Keywords    Boroxycarben Ligands, Iron Carbonyl Complexes, NMR Spectra 
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 Identifier    ZNB-1981-36b-0335 
 Volume    36 
71Author    Wolfgang Sucrow, Wolfgang TurnschekRequires cookie*
 Title    Enhydrazine, XXX [1] Phenyloge Enhydrazine ohne direkte N.N-Bindung Enehydrazines, XXX [1] Phenylogous Enehydrazines without a Direct N,N-Bond  
 Abstract    2-[N-(5,5-Dimethyl-3-oxo-l-cyclohexenyl)-N-aryl]-aminoacrylates, Quinoline-2,5-diones 
  Reference    Z. Naturforsch. 36b, 339—344 (1981); eingegangen am 10. Dezember 1980 
  Published    1981 
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 Identifier    ZNB-1981-36b-0339 
 Volume    36 
72Author    Klaus Burger, Herbert Goth, Kurt Einhellig, Alfred GierenRequires cookie*
 Title    Zum Thermolyseverhalten von 2.2-Dihydro-1.4.2-oxazaphosphol-4-enen, I Über die Dimerisierung von bis(trifluormethyl)substituierten Nitril-yliden [1, 2] Thermolysis of 2,2-Dihydro-l,4,2-oxazaphosphol-4-enes, I Dimerization of Bis(trifluoromethyl) Substituted Nitrile Ylides [1, 2]  
  Reference    Z. Naturforsch. 36b, 345—352 (1981); eingegangen am 18. November 1980 
  Published    1981 
  Keywords    I, 4, 2-Oxazaphosphoranes, 5->-[3 + 2]Cycloreversion Reactions, 1, 3-Dipole Dimerization, Head to Head Dimerization 
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 Identifier    ZNB-1981-36b-0345 
 Volume    36 
73Author    Klaus Burger, Herbert Goth, Eduard BurgisRequires cookie*
 Title    Zum Thermolyseverhalten von 2.2-Dihydro-1.4.2-oxazaphosphol-4-enen, II [1] Eine einfache Synthese für fluorsubstituierte N-Vinylimidoylchloride Thermolysis of 2,2-Dihydro-l,4,2-oxazaphosphol-4-enes, II [1] A Simple Synthesis for Fluorine Substituted N-Vinylimidoyl Chlorides  
 Abstract    3,3-Bis(chlorodifluoromethyl)-2,2,2-trimethoxy-2,2-dihydro-l,4,2-oxazaphosphol-4-enes (2) at room temperature, 3,3-bis(chlorodifluoromethyl)-2,2,2-triphenoxy-2,2-dihydro-l,4,2-oxazaphosphol-4-enes (3) at 140-145 °C undergo cycloelimination of trimethyl, and triphenyl phosphate, respectively, with formation of N-[l-chlorodifluoromethyl-2,2-di-fluoro(vinyl)]-imidoyl chlorides (4) in high yields. 
  Reference    Z. Naturforsch. 36b, 353—358 (1981); eingegangen am 18. November 1980 
  Published    1981 
  Keywords    Phosphorus Compounds, [3 + 2] Cycloreversion Reactions, [1, 4] Chlorine Shift, 2 -Azabuta-1, 3 -dienes 
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 Identifier    ZNB-1981-36b-0353 
 Volume    36 
74Author    Thomas Rausch, Frieder Hofmann, Willy HilgenbergRequires cookie*
 Title    Kinetics of Oxidation of Tryptophan by Sodium Hypochlorite  
 Abstract    The oxidation of tryptophan to 3-indoleacetaldehyde with sodium hypochlorite was investigated with 14 C labelled DL-tryptophan. The reaction was performed under pseudo first order conditions. From the pH dependence of the reaction it was concluded that only the unprotonated tryptophan is converted to the aldehyde. The activation energy is 35 ± 2.2 (SE) kJ x mol -1 as derived from the Arrhenius plot. Variing the pH between 8.5 and 11.0 and the temperature in the range from 298 K to 318 K did not alter the selectivity of the reaction as confirmed by TLC of the product (purity > 90%). A possible reaction mechanism is proposed. 
  Reference    Z. Naturforsch. 36b, 359—361 (1981); received September 12 1980 
  Published    1981 
  Keywords    Tryptophan, Indoleacetaldehyde, Amino Acid Oxidation, Sodium Hypochlorite, Reaction Kinetics 
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 Identifier    ZNB-1981-36b-0359 
 Volume    36 
75Author    SamiBassili Awad, AlfyBadie Sakla, Nadia Fouad, Abdul-Malik, NashedIshak SamaanRequires cookie*
 Title    ,4-Cycloaddition of p-Benzoquinone; 1,4-Naphthoquinone and N-Phenylmaleimide to 9-Vinylidenexanthene (or Thioxanthene) Derivatives  
 Abstract    ja-Benzoquinone, 1,4-Cycloaddition 13-Substituted naphthene(K l)xanthene(or thioxanthene)-1,4-dione (4a, b) have been obtained by thermal cycloaddition of p-benzoquinone (2) to 9-vinylidenexanthene(or thioxanthene) derivatives (la, b). Reductive acetylation of 4 gives the diacetoxy 
  Reference    Z. Naturforsch. 36b, 362—365 (1981); received October 13 1980 
  Published    1981 
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 Identifier    ZNB-1981-36b-0362 
 Volume    36 
76Author    H. A. Daboun, A. M. Abd-Elfattah, M. M. Hussein, A.F A ShalabyRequires cookie*
 Title    Reactions of Amino Acids on 2-Methylmercaptohydantoin Derivatives. Synthesis of Imidazoimidazoline and Imidazoquinazoline Derivatives  
 Abstract    Treatment of 5-arylidene-2-methylmercaptohydantoins (la-d) and 
  Reference    Z. Naturforsch. 36b, 366—369 (1981); received October 29 1980 
  Published    1981 
  Keywords    Amino Acids, 2-Methylmercaptohydantoins, Imidazoimidazolines, Imidazoquinazolines 
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 Identifier    ZNB-1981-36b-0366 
 Volume    36 
77Author    Shinji Ohmori, Kazuko Takahashi, Mikiko Ikeda, Toshihiko UbukaRequires cookie*
 Title    A Fundamental Study of Quantitative Desulfurization of Sulfur Containing Amino Acids by Raney Nickel and its Character  
 Abstract    The desulfurization of several naturally oc cm-ring sulfur-containing amino acids by Raney nickel was studied under various conditions. Raney nickel, which was prepared by treating Al-Ni alloy with 5 N NaOH at 60 °C for 30 min, and was not washed with water, was most active and desulfurized, in quantitative yield, methionine, homocysteine, homocystine, homocysteine sulfinic acid, S-(2-carboxy-n-propyl)-L-cysteine, cysteine, cystine, cysteine sulfinic acid and S-methylcysteine sulfoxide. Raney nickel prepared from 100 mg of Al-Ni alloy desulfurized quantitatively up to 40 //mol methionine at 60 °C for 30 min. The desulfurization occurred effectively in the pH range of 7 and 13, but not below 7. Methionine sulfone, cysteic acid, and homocysteic acid were not subject to the reaction. The Raney nickel was deactivated by H2S, and H2O2, or combustion. De-sulfurization activity was not enhanced by hydrogen gas. 
  Reference    Z. Naturforsch. 36b, 370—374 (1981); received November 27 1980 
  Published    1981 
  Keywords    Desulfurization, Raney Nickel, Sulfur Containing Amino Acids 
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 Identifier    ZNB-1981-36b-0370 
 Volume    36 
78Author    Klaus Praefcke, Dietmar Schmidt, HerrnF. Prof, BohlmannRequires cookie*
 Title    Erste flüssigkristalline Azulen-Derivate [1] First Liquid Crystal Azulene Derivatives [1]  
 Abstract    Various azulene derivatives as a new type of coloured liquid crystals have been syn-thesized. Their mesomorphic behaviour is described. Einführung Flüssigkristallanzeigen stellen, nicht zuletzt we-gen ihrer weitaus geringeren Stromaufnahme, eine erfolgversprechende Alternative zu den bisher ge-bräuchlichen, lichterzeugenden Displays dar. Wäh-rend letztere in fast jeder gewünschten Farbe her-gestellt werden können, ist eine farbige Flüssig-kristallanzeige bisher nur durch Dotierung des flüssigkristallinen Materials mit einem Farbstoff zu erzielen, da bis heute noch keine für technische Anwendungen geeigneten farbigen Flüssigkristalle bekannt sind. Eine Vielzahl von Dotierstoffen der unterschied-lichsten Strukturen sind kürzlich in einem Review über ,,Guest-Host"-Systeme zusammengefaßt wor-den [2]. Ergebnisse und Diskussion In Fortsetzung unserer Arbeiten auf dem Gebiet der flüssigen Kristalle haben wir nach den gelben 
  Reference    Z. Naturforsch. 36b, 375—378 (1981); eingegangen am 1. Dezember 1980 
  Published    1981 
  Keywords    Azulenes, Coloured Liquid Crystals, Nematic Phases 
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 Identifier    ZNB-1981-36b-0375 
 Volume    36 
79Author    A. Römer, H. Thomas, B. Kreuels, H. BudzikiewiczRequires cookie*
 Title    Sesquiterpenester der B-Reihe aus Euonymus europaeus L. [1] Sesquiterpene Esters of Type B from Euonymus europaeus L. [1]  
 Abstract    Sesquiterpene Esters, Euonymus europaeus L. The structure of several esters of 8-epi-desoxymaytol has been elucidated. Die für Euonymus europaeus typischen Terpene leiten sich vom Ringgerüst des Agarofurans ab [2]. In früheren Arbeiten haben wir über die Struktur zweier Alkohole [3], u.zw. A (= 7/?-Hydroxy-3.4-didesoxy-8-epi-maytol = Alatol [4, 5]) und B (= 8-epi-Desoxymaytol, 1) sowie über die Ester der A-Reihe [5] berichtet. Alkohol B ist gleichfalls Grundkörper einer Reihe von Estern, wie sich durch Verseifen von B-l und B-4 [3] sowie einiger neu isolierter Verbindungen (B-2, B-3, B-5 bis B-7) er-gibt. Art und Anzahl der veresternden Säuren (s. Tab. I) (Benzoe-, /J-Furancarbon-, Essig-und (+) = (S)-a-Methylbuttersäure) wurde Massen-und NMR-spektroskopisch bestimmt (s. [3]), a-Methyl-buttersäure überdies als Methylester durch Ver-gleich der Retentionszeit und des Massenspektrums 
  Reference    Z. Naturforsch. 36b, 379—382 (1981); eingegangen am 5. Dezember 1980 
  Published    1981 
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 Identifier    ZNB-1981-36b-0379 
 Volume    36 
80Author    Ulrich WolfRequires cookie*
 Title    7H-Imidazo[1.2-a]-und -[1.5-a]azepin-7-one 7H-Imidazo[l,2-a]-and -[l,5-a]azepine-7-ones  
 Abstract    2-and -4(5)[l-Butene-3-one-yl]-imidazoles, 
  Reference    Z. Naturforsch. 36b, 383—385 (1981); eingegangen am 31. Oktober 1980 
  Published    1981 
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 Identifier    ZNB-1981-36b-0383 
 Volume    36 
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