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1976 (386)
61Author    V. Formacek, M.A R SmithRequires cookie*
 Title    Botanisches Institut I der Universität (TH) Karlsruhe  
 Abstract    Apiaceae, Pimpinella anisum, Essential oil, 13 C NMR From the essential oil of Pimpinella anisum fruits a hitherto unknown type of phenylpro-pane was isolated. The mass, infrared, and 13 C NMR spectra indicate, that the unknown is a 2-methyl-butyric acid ester of 2-hydroxy-5-methoxy-<rans-propenylbenzene. 
  Reference    (Z. Naturforsch. 31b, 283—284 [1976]; received September 25 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0283_n 
 Volume    31 
62Author    S. Pietra, M. FinettiRequires cookie*
 Title    Electrical Conduction in Thiantrene  
 Abstract    Electrical Conductivity, Organic Compounds Electrical conductivity of thiantrene mono-crystals was observed. The experimental results were interpreted as a "hopping" mechanism between the molecules of crystal. 
  Reference    (Z. Naturforsch. 31b, 285—286 [1976]; received August 4 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0285_n 
 Volume    31 
63Author    H.E JRequires cookie*
 Title    Reduction of Indolic Imides with Sodium Borohydride ATTA-UR-RAHMAN and NIGHAT WAHEED  
 Abstract    Reduction The reduction of imides with sodium boro-hydride affords ring cleaved products instead of the corresponding carbinol lactams sug-gested previously. 
  Reference    (Z. Naturforsch. 31b, 287—288 [1976]; received September 23 1975) 
  Published    1976 
  Keywords    Imides, Cyclization, Indole Alkaloids, Sodium Borohydride 
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 Identifier    ZNB-1976-31b-0287_n 
 Volume    31 
64Author    J. C. Huffman, H. Fusstetter», H. NöthRequires cookie*
 Title    Contributions to the Chemistry of Boron, LXXV 1 The Crystal and Molecular Structure of a Tetraazadiborine: 3,6-Bis(dimethylamino)-l,2,4,5-tetramethyl-l,2,4,5,3,6-tetraazadiborine  
 Abstract    X-ray, Bis(dimethylamino)-tetramethyl-tetraazadiborine The title compound crystallizes in the monoclinic system with dimensions of the unit cell a = 14.09(2), b = 8.60(1), c = 11.34(1) A and ß = 101.7 The space group was determined to be A 2/a with four molecules in the unit cell. The structure was solved by direct methods, and all hydrogen atoms were located. Full matrix refinement led to R — 0.059. The B2N4 six membered ring is nonplanar as expected for an 8n electron heterocycle. The molecule possesses C2 symmetry but the ring itself is near the D2 symmetry as derived from earlier CNDO/S-calculations. The BN bond lengths are 1.43 A, the NN distances 1.43 A and the average CN distances 1.44 A. The boron atoms and four of the six nitrogen atoms are trigonal-planarly coordinated while the remaining two N-atoms (N X ,N 2) deviate little, but significantly, from sp 2 hybridisation. The structure of the molecule can be interpreted as the best compromise between BN-jr-bonding, nonbonding repulsion be-tween adjacent CH3 groups, and the interaction between neighbouring 'free pairs of electrons' of the ring N-N-units. 
  Reference    (Z. Naturforsch. 31b, 289—293 [1976]; received November 20 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0289 
 Volume    31 
65Author    Gerhard Hoch, Rainer Panter, ManfredL. ZieglerRequires cookie*
 Title    Darstellung und Charakterisierung von Halogeniden und Pseudohalogeniden des Typs TT-C7H7-M(CO)2X Synthesis and Characterization of Halides and Pseudohalides of the Type  
 Abstract    Halides, Pseudohalides, Nitrogen Atoms Halides and pseudohalides of formula tt-C7H7M(CO)2X were synthesized by reaction of OC7H7M(CO)3][BF4] and Jz-C7H7M(CO)2Br, with NaXorKX (M = Mo, X = OCN" SON", Nr; M = W, X = Cl-, Br-, OCN-, Nr). In the OCN~ and SCN-complexes the ligands are coordinated by the nitrogen atoms. The reaction of [jr-C7H7W(C0)3][BF4] with KOCN yielded (besides 7r-C7H7W(C0)2NC0) a compound which proved to be themono-tricarbonyl-tungsten derivative of bicycloheptatrienyl (C7H7)2W(CO)3. This compound could also be isolated from [>-C7H7W(CO)3][BF4] and Na[NCNH]. Ring contraction occurred when O-C7H7W(C0)3][BF4] was treated with Na2[NCN]. R. B. KING und A. FRONZAGLIA erhielten ge-mäß (1) 
  Reference    (Z. Naturforsch. 31b, 294—299 [1976]; eingegangen am 29. Juli/11. November 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0294 
 Volume    31 
66Author    Requires cookie*
 Title      
 Abstract    Tetraformatozirconium(IV), Diformatoxozireonium(IV)dihydrate, Thermogravimetry, IR Spectra Tetraformatozirconium(IV), Zr(OOCH)4 and diformatoxozirconium(IV)dihydrate, ZrO(OOCH)2 • 2 H2O have been prepared by the reactions of tetrachlorozirconium(IV) and dichloroxozirconium(IV) with anhydrous formic acid, respectively. The compounds have been characterized by elemental analyses, molar conductance, thermogravimetry and in-frared spectral data. The compounds are nonelectrolytes in nitrobenzene and have poly-meric structures. 
  Reference    (Z. Naturforsch. 31b, 300—303 [1976]; received October 27 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0300 
 Volume    31 
67Author    Oswald Adler, Friedhelm KoberRequires cookie*
 Title    Transamination of 2-Dimethylamino-[l,3,2]oxathiarsolane  
 Abstract    Aminoarsine, Oxathiarsolane The reactions of 2-dimethylamino-[l,3,2]oxathiarsolane with secondary amines lead to the formation of 2-dialkylamino-[l,3,2]oxathiarsolanes. IR, J H NMR and mass spectral data are presented and discussed. 
  Reference    (Z. Naturforsch. 31b, 304—306 [1976]; eingegangen am 11. November 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0304 
 Volume    31 
68Author    WernerJ. Rühl, Friedhelm KoberRequires cookie*
 Title    Umsetzung von Aminoarsinen mit tri-und tetrafunktionellen Alkoholen Reaction of Aminoarsines with Tri-and Tetrafunctional Alcoholes  
 Abstract    Arsinous Acid Esters, Aminoarsines The reactions ot the tri-and tetrafunctional alcoholes CH3C(CH20H)3 and C(CH20H)4 with the aminoarsines (CH3)2As-N(CH3)2, CH3As[N(CH3)2]2, and As[N(CH3)2]3 are exa-mined. The reactions lead by cleavage of the As-N-bond to the formation of acyclic and mono-and bicyclic arsinous acid esters. Allgemeiner Teil 
  Reference    (Z. Naturforsch. 31b, 307—310 [1976]; eingegangen am 18. August/26. November 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0307 
 Volume    31 
69Author    Klaus-Jürgen Range, Richard LeebRequires cookie*
 Title    Preparation and Crystal Structure of the High Pressure Phase Tm 2 S3-II  
 Abstract    Single crystals of the quenchable high pressure phase Trri2S3-II were grown from a TmJ3-flux at 10 kbar, 1600 °C. The crystals are monoclinic, space group P2i/m, with a = 11.110(5) A, 6 = 3.874(3) A, c = 10.872(5) A, ß = 108.88(2) ° and Z = 4. In Tm2S3-II, which is isotypic with Er3ScS6, the four independent thulium atoms are coordinated by six (2 x), seven and eight sulfur atoms. 
  Reference    (Z. Naturforsch. 31b, 311—314 [1976]; eingegangen am 7. November 1975) 
  Published    1976 
  Keywords    Thulium Sesquisulfide, High Pressure Phase, Crystal Structure 
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 Identifier    ZNB-1976-31b-0311 
 Volume    31 
70Author    Hans-Ulrich Kreusler, Günther Wiese, Wolfram StüweRequires cookie*
 Title    Investigations on a Blue Solution of Molybdenum(VT)-oxide in Sulfuric Acid  
 Abstract    Spectralphotometric measurements, Molybdenum(VI)-oxide The change of the yellowish solution of M0O3 in concentrated sulfuric acid into a dark blue colour by diluting with water has its maximum at H2SO4 • 2,85 H2O. Spectralphotomet-ric measures show a significant difference to the colour of solutions containing molybde-num-blues. 
  Reference    (Z. Naturforsch. 31b, 315—317 [1976]; eingegangen am 29. August/22. Oktober 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0315 
 Volume    31 
71Author    Herbert Brunner, Reginald GruehnRequires cookie*
 Title    Synthesis and Structure of a New Polymorph of FeNb0 4  
 Abstract    Three different polymorphs of FeNbC>4 were prepared by chemical transport. One of them is a new modification, which crystallisizes in the GaNb04-type, monoclinic, space group C2, o= 12.52 A; 6 = 3.83 A; c=6.67Ä; 107.5°. The detailed structure, composed of 2 X 2 'blocks' of corner shared metal-oxygen octahedra, was investigated by electron-diffraction and two-dimensional high resolution electron microscopy. Bisherige Untersuchungen an FeNb04, 
  Reference    (Z. Naturforsch. 31b, 318—320 [1976]; eingegangen am 21. Oktober 1975) 
  Published    1976 
  Keywords    Iron Niobate, Crystal Structure, Electron Diffraction, High Resolution Electron Microscopy 
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 Identifier    ZNB-1976-31b-0318 
 Volume    31 
72Author    Hans-G Biedermann, Karl Öfele, Jakub TajtelbaumRequires cookie*
 Title    Transition-metal ^-Complexes with Unsaturated and Aromatic Heterocycles, IV 1 zr-Complexes of Methylsubstituted Pyridines with Chromium(O)  
 Abstract    Pyridine jz-Complexes, 2,6-Dimethylpyridine, 2,3,5,6-Tetramethylpyridine Pyridine ^-complexes are prepared by treating 2,6-dimethylpyridine and 2,3,5,6-tetramethylpyridine with Cr(CO)6-Thus, tricarbonyl(2,6-dimethylpyridine)chromium(0) and tricarbonyl(2,3,5,6-tetramethylpyridine)chromium(0) are obtained. IR and !H NMR spectra are discussed together with those of tricarbonyl(pentamethylpyridine)chromium(0) and tricarbony 1 (2,4,6 -trimethylpyridine)chromium (0). 
  Reference    (Z. Naturforsch. 31b, 321—323 [1976]; eingegangen am 18. Dezember 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0321 
 Volume    31 
73Author    Eberhard Hohaus, Wolfgang RiepeRequires cookie*
 Title    Massenspektrometrische Untersuchungen an Borchelaten, III1 , 2 Massenspektrometrische Fragmentierung von Fluorobor- und Phenylborchelaten  
 Abstract    Mass spectra of several fluoroboron and phenylboron chelates were compared with regard to the influence of the boron substituent F and C6H5. The fragmentation pattern depends very strongly on the type of the substituent. In the case of the fluorine substituent, the three bonding states of boron will be reached preferably by opening the chelate ring. For the substituent CßHs this state of boron will be reached by elimination of C6H5. 
  Reference    (Z. Naturforsch. 31b, 324—329 [1976]; eingegangen am 23. Oktober 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0324 
 Volume    31 
74Author    P. R. DanesiRequires cookie*
 Title      
 Abstract    Crystalline complexes of some alkali and alkaline earth Perchlorates and picrates with macrocyclic polyethers have been synthesized. With the alkyl substituted aromatic macro-cyclic polyethers bis(3,5-di-£er£-butylbenzo)-18-crown-6 and bis(4-hexadecylbenzo)-18-crown-6 it was not possible to isolate all the complexes in the crystalline form. In fact the steric hindrance, caused by the alkyl substituents, affects the stability of the complexes and hinders the possibility of isolation. It has been observed that also the molecular structure and the electronic configuration of the anion are important factors in determing the formation of crystalline complexes. The complexes obtained were identified and characterized by ele-mental analysis, IR, UV and iH NMR spectra, conductivity and x-ray powder analysis. 
  Reference    (Z. Naturforsch. 31b, 330—335 [1976]; received October 10 1975) 
  Published    1976 
  Keywords    Macrocyclic Polyether Complexes, Alkali Perchlorate, Picrate Complexes, Alkaline Earth Perchlorate, Picrate Complexes 
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 Identifier    ZNB-1976-31b-0330 
 Volume    31 
75Author    FriedrichFranz SeeligRequires cookie*
 Title    Effects in the Hydroformylation Process  
 Abstract    The complicated and partially controversial formulations of the various steps and branchings in the hydroformylation process are comprised in a reaction scheme that ne-glects the production of different isomers and isomerisations of olefins and is a compromise between the given complexity and a theoretical tractability. Special consideration is devoted to the inhibition of the process by one of its substrates, CO. In a first approxima-tion complete inertness of the Co-tetracarbonyls is assumed and the existence of bistability and hysteresis for particular parameter combinations is proved. In the further treatment this approximation is again relaxed. Technological consequences of the analysis are discussed. 
  Reference    (Z. Naturforsch. 31b, 336—341 [1976]; received October 21 1975) 
  Published    1976 
  Keywords    Hydroformylation, Oxo-synthesis, System Theory, Stability Analysis, Hysteresis 
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 Identifier    ZNB-1976-31b-0336 
 Volume    31 
76Author    Volker BätzelRequires cookie*
 Title    X-ray Structure Analysis of (CO) 9 Co 3 COBBr 2 N(C2H5)3  
 Abstract    Methylidyne-tricobaltnonacarbonyl-cluster, X-ray Using three dimensional X-ray data collected on a four circle diffractometer, the structure of (CO)9Co3COBBr2N(C2H5)3 was solved by Patterson and Fourier methods. Least squares refinement with a block-diagonal matrix leads to a reliability index of R — 10.7%. Crystal data: a = 13.277(6) A, b = 10.17(1) A, c = 9.22(2) A; a = 91.12(6) ß = 87.61(4) °,y = 98.79(2) space group P7; Z = 2; V -1229,7 A 3 ; Dx = 1.97 gem -3 . 
  Reference    (Z. Naturforsch. 31b, 342—344 [1976]; eingegangen am 13. November 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0342 
 Volume    31 
77Author    Requires cookie*
 Title      
 Abstract    Bromothiophenes, Photodebromination, jr-Complex UV irradiation of 2-bromothiophene or 3-bromothiophene in various organic solvents produces thiophene as one of the reaction products. The likely mechanism in the case of 2-bromothiophene involves the formation of a 7r-complex between the thienyl radical and the bromine atom. 
  Reference    (Z. Naturforsch. 31b, 345—347 [1976]; received September 30 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0345 
 Volume    31 
78Author    Friedrich Boberg, Ferdinand HanischRequires cookie*
 Title    On Labelled Compounds, XXIV 1 Chlorine Exchange Antimony(III)-chloride Hexachloropropene in Systems with Electron Donors  
 Abstract    Chlorine Exchange, (36 Cl)Antimony(III)-chloride, (36 Cl)Hexachloropropene, Electron Donor 
  Reference    (Z. Naturforsch. 31b, 348—353 [1976]; eingegangen am 3. Oktober 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0348 
 Volume    31 
79Author    A. Okruszek, W. J. StecRequires cookie*
 Title    in 2-Fluoro-4-methyl-l,3,2-dioxaphosphorinanyl Ring System  
 Abstract    Dioxaphosphorinans, Fluorine Substituent, Axial Preference The axial preference of fluorine substituent at phosphorus involved in 4-methyl-1,3,2-dioxaphosphorinanyl ring system was established. Cis-trans geometry in this family of compounds was assigned by chemical correlation and by means of m, 13 C, 19 F and sip NMR. 
  Reference    (Z. Naturforsch. 31b, 354—360 [1976]; received July 17 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0354 
 Volume    31 
80Author    Shozi Yamashita, Mizuki Yoshida, Giiti TomitaRequires cookie*
 Title    Photoionization of Indole in Alkaline Aqueous Solutions at 77 °K  
 Abstract    The photoionization process of indole in alkaline aqueous solutions at 77 °K and the recombination process of trapped electron with its mother molecule were investigated. The fluorescence spectrum of indole in these glassy media depended on the NaOH concentration; the disappearance of the 325 nm band at the NaOH concentrations higher than 5 M with the appearance of a fluorescence band at 375 nm. The latter emission is possibly ascribed to the fluorescence of indole anion formed by proton dissociation in the excited singlet state of indole. The intensities of the 375 nm band and the ESR signal due to trapped electrons were dependent on the NaOH concentration and increased steeply with increasing the NaOH concentration. There was a parallel relation between the indole anion concentration and the trapped electron density to some extent. The dependence of the ESR signal intensity on irradiation intensity suggested that the photoionization of indole in alkaline aqueous solution occurred through a two photon process. The presence of a photoactive intermediate for absorbing the second photon was further investigated with simultaneous irradiation of two different wavelength lights. The trapped electron was detrapped with the irradiation of visible light (e.g. 580 nm), and its recombination with mother molecule caused an emission with the same spectrum as indole phosphorescence. The molecular species of the photoactive intermediate in alkaline aqueous solutions seems to be the indole anion. The photoionization in NaOH aqueous solution at 77 °K was also compared with that in methanolic glassy solution. 
  Reference    (Z. Naturforsch. 31b, 361—366 [1976]; received April 28/July 22 1975) 
  Published    1976 
  Keywords    Photoionization, Phosphorescence, ESR, Trapped Electron, Indole 
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 Identifier    ZNB-1976-31b-0361 
 Volume    31 
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