| | 61 | Author
| Wolfgang Holzbach, Karl Wieghardt, Johannes Weiss | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0289.pdf | | | | Identifier
| ZNB-1981-36b-0289 | | | | Volume
| 36 | |
| 63 | Author
| Ekkehard Lindner, JuanCarlos Wuhrmann | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0297.pdf | | | | Identifier
| ZNB-1981-36b-0297 | | | | Volume
| 36 | |
| 64 | Author
| Joseph Grobe, Heinz Zimmermann | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0301.pdf | | | | Identifier
| ZNB-1981-36b-0301 | | | | Volume
| 36 | |
| 65 | Author
| Klaus Büscher, Susanne Heuer, Bernt Krebs | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0307.pdf | | | | Identifier
| ZNB-1981-36b-0307 | | | | Volume
| 36 | |
| 66 | Author
| H. Mongeot, H. R. Atchekzai | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0313.pdf | | | | Identifier
| ZNB-1981-36b-0313 | | | | Volume
| 36 | |
| 67 | Author
| Hans-Otto Stühler, Joachim Pickardt | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0315.pdf | | | | Identifier
| ZNB-1981-36b-0315 | | | | Volume
| 36 | |
| 68 | Author
| Helmut Werner, Tri Ngo-Khae, Claus Friebel, Peter Köhler, Dirk Reinen | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0322.pdf | | | | Identifier
| ZNB-1981-36b-0322 | | | | Volume
| 36 | |
| 72 | Author
| Klaus Burger, Herbert Goth, Kurt Einhellig, Alfred Gieren | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0345.pdf | | | | Identifier
| ZNB-1981-36b-0345 | | | | Volume
| 36 | |
| 73 | Author
| Klaus Burger, Herbert Goth, Eduard Burgis | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0353.pdf | | | | Identifier
| ZNB-1981-36b-0353 | | | | Volume
| 36 | |
| 74 | Author
| Thomas Rausch, Frieder Hofmann, Willy Hilgenberg | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0359.pdf | | | | Identifier
| ZNB-1981-36b-0359 | | | | Volume
| 36 | |
| 75 | Author
| SamiBassili Awad, AlfyBadie Sakla, Nadia Fouad, Abdul-Malik, NashedIshak Samaan | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0362.pdf | | | | Identifier
| ZNB-1981-36b-0362 | | | | Volume
| 36 | |
| 77 | Author
| Shinji Ohmori, Kazuko Takahashi, Mikiko Ikeda, Toshihiko Ubuka | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0370.pdf | | | | Identifier
| ZNB-1981-36b-0370 | | | | Volume
| 36 | |
| 78 | Author
| Klaus Praefcke, Dietmar Schmidt, HerrnF. Prof, Bohlmann | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0375.pdf | | | | Identifier
| ZNB-1981-36b-0375 | | | | Volume
| 36 | |
| 79 | Author
| A. Römer, H. Thomas, B. Kreuels, H. Budzikiewicz | Requires 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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| default:Reihe_B/36/ZNB-1981-36b-0379.pdf | | | | Identifier
| ZNB-1981-36b-0379 | | | | Volume
| 36 | |
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