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1981 (332)
161Author    D. Fenske, P. K. Brandt, StockRequires cookie*
 Title    Ungewöhnliche Substitutionsreaktion von (cr-Allyl)manganpentacarbonyl mit 2.3-Bis(diphenylphosphino)- N -methylmaleinimid Unusual Reaction of ((T-Allyl)manganesepentacarbonyl with Bis(diphenylphosphino)-N-methyl Maleic Anhydride  
 Abstract    Crystal Structure, (cr-Allyl)manganpentacarbonyl (T-C3H5 • Mn(CO)ö reacts with bis(diphenyl-phosphino)-N-methyl maleic anhydride to form a complex in which the C3Hs-ligand migrates from the coordination sphere of Mn to the phosphine ligand. The high yield (70%) suggests that this reaction takes place within the co-ordination sphere of Mn. The product (X-ray analysis) shows unusual bonding properties. 
  Reference    Z. Naturforsch. 36b, 768—770 (1981); eingegangen am 13. Februar 1981 
  Published    1981 
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 Identifier    ZNB-1981-36b-0768_n 
 Volume    36 
162Author    Bernhard Ciommer, Helmut Schwarz, Azzedine Maaroufi, ManfredT. Reetz, Karsten LevsenRequires cookie*
 Title    Silyl-Assistierte Etherspaltung bei Radikalkationen von Hydroxylaminderivaten [1] Silyl-Assisted Ether Cleavage in Radical Cations of Hydroxylamine Derivatives [1]  
 Abstract    It is demonstrad by means of various mass spectrometric techniques that the dissociative ionization of N.N-bis-silylated hydroxylamine derivatives (5 a) and (5 b), giving rise to the cleavage of the (O-C) bond, is anchimerically assisted by migration of the trimethylsilyl group to the ether oxygen, thus generating ion (7). 
  Reference    Z. Naturforsch. 36b, 771—773 (1981); eingegangen am 11. März 1981 
  Published    1981 
  Keywords    Mass Spectrometry, Collisional Activation, Anchimeric Assistance, Silyl Ether 
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 Identifier    ZNB-1981-36b-0771_n 
 Volume    36 
163Author    Norbert Thiel, W. Schwarz, A. SchmidtRequires cookie*
 Title    N-Chlor-alkanammonium-hexachloroantimonate(y) Spektren und Struktur N-Chloro Alkaneammonium Hexachloroantimonates(V) Spectra and Structure  
 Abstract    Chloroammonium Salts N-Alkyl-N-chloro and N-chloro alkaneammonium hexachloroantimonates(V) are prepared by reaction of N-alkyl-N-chloro and N,N-dichloroalkaneamines, resp., with hydrogenchloride/antimony(V) chloride (R = Me, Et, n-Pr, i-Pr, n-Bu, i-Bu, <-Bu). 1 Hn.m.r. and the vibrational spectra are measured and NCI vibrations of the chloro alkaneamines, which exist in different rotational isomers, are reported. The crystal and molecular structure of the N-ethyl-N-chloro ethylammonium hexachloroantimonate(V) (2) is determined by X-ray analysis. 
  Reference    Z. Naturforsch. 36b, 775—780 (1981); eingegangen am 9. März/28. April 1981 
  Published    1981 
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 Identifier    ZNB-1981-36b-0775 
 Volume    36 
164Author    ErnstOtto Fischer, Peter StadlerRequires cookie*
 Title    Übergangsmetall-Carben  
 Abstract    Komplexe, CXIX [1] Carbonyl [ethoxy(triphenylsilyl)carben] (dinitrosyl)eisen Transition Metal Carbene Complexes, CXIX [1] Carbonyl[ethoxy(triphenylsilyl)carbene](dinitrosyl)iron Carbonyl[ethoxy(triphenylsilyl)carbene](dinitrosyl)iron Dicarbonyl(dinitrosyl)iron reacts with triphenylsilyllithium and subsequently with triethyloxonium tetrafluoroborate to give carbonyl[ethoxy(triphenylsilyl)carbene](di-nitrosyl)iron. 
  Reference    Z. Naturforsch. 36b, 781—782 (1981); eingegangen am 29. April 1981 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0781.pdf 
 Identifier    ZNB-1981-36b-0781 
 Volume    36 
165Author    Shinzi Kato, Eiji Hattori, Hiroyuki Sato, Masateru Mizuta, Masaru IshidaRequires cookie*
 Title    Preparation and Some Reactions of Phenylmercury Thio-and Dithiocarboxylates  
 Abstract    Phenylmercury Thiocarboxylates It has been found that the reaction of diphenylmercury with an equimolar amount of thio-or dithio acids gave the corresponding phenylmercury thio-(1) or dithiocarboxylates (2), quantitatively, which further react with thio-or dithio acids to give mercury bis (thio-) (3) or bis(dithiocarboxylates) (4). The phenylmercury dithio salts (2) were found to be the very useful thioacylating agents for primary and secondary amines. The reaction of mercury bis(thiocarboxylates) (3) with dithiocarboxylic acids gave the unsymmetrical thio-and dithiocarboxylic acid mercury salts [RC(0)SHgS(S)CR'j (5) in good yields. 
  Reference    Z. Naturforsch. 36b, 783—790 (1981); received April 1 1981 
  Published    1981 
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 Identifier    ZNB-1981-36b-0783 
 Volume    36 
166Author    Udo Engelhardt, Bernd Friedrich, Ingeborg KirnerRequires cookie*
 Title    Komplexe zweifach positiver Übergangsmetallkationen mit Hydrazido-thiophosphorsäure-estern Complexes of Divalent Transition Metals with Hydrazido Thiophosphoric Acid Esters  
 Abstract    Dihydrazido thiophosphoric acid phenyl ester, (NH2NH)2P(= S)-OC6H5 (DHTPPH), forms a 2:1 complex with manganese(II) chloride: [Mn(II)(DHTPPh)2Cl2], soluble in methanol. Solvolysis yields the corresponding methyl ester complex. With water in methanol the dihydrazidothiophosphato complex [Mn(II){(NH2NH)2P(= 0)S}2] is formed. Monohydrazido thiophosphoric acid diphenyl ester NH2NH-P(= S)(OC6H5)2 (MHTPPh) gives various complexes with first row transition metals: [M(II)(MHTPPh)"X2], n = 2, 4; X = halogen. The nickel complex (n = 4; X = Cl) is characterized by elemental analysis and spectroscopic methods. MHTPPh is monodentate through the terminal N atoms of the hydrazido groups. Iron(II) and cadmium complexes have different compositions (n— 2; X = Cl) and therefore different structures, probably with MHTPPh as a bidentate chelate ligand. Einführung 
  Reference    Z. Naturforsch. 36b, 791—791 (1981); eingegangen am 3. April/12. Mai 1981 
  Published    1981 
  Keywords    Cadmium Complexes, Dihydrazido Thiophosphoric Acid Esters, Monohydrazido Thiophosphoric Acid Diphenylester 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0791.pdf 
 Identifier    ZNB-1981-36b-0791 
 Volume    36 
167Author    Gernot Frenking, Helmut SchwarzRequires cookie*
 Title    Frontorbitale und 1.2-Hydridwanderungen in Carbeniumionen Frontier Orbitals and 1,2-Hydrogen Shifts in Carbenium Ions  
 Abstract    For various carbenium ions it is shown that the energy value and the degree of localiza-tion of the LUMO have a significant influence on the energy barriers of 1,2-hydrogen shifts. The structures of the transition states are in line with the Hammond-Postulate. 
  Reference    Z. Naturforsch. 36b, 797—801 (1981); eingegangen am 10. März 1981 
  Published    1981 
  Keywords    Carbocation Chemistry, 1, 2-Hydrogen Migration, Frontier Orbitals, Quantum Mechanical Calculations, Transition States 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0797.pdf 
 Identifier    ZNB-1981-36b-0797 
 Volume    36 
168Author    Ger Vos, JaapG. Haasnoot, WillemL. GroeneveldRequires cookie*
 Title    Complexes of 1,2,4-Triazoles, Part XVI Binuclear Complexes of Transition Metal(II)thiocyanates with 4-Ethyl-l,2,4-triazole  
 Abstract    Coordination compounds of 4-ethyl-l,2,4-triazole (Ettrz) with Mn, Fe, Co, Ni, Cu and Zn are reported. The compounds have been identified and characterized by chemical analyses, infrared and ligand field spectra, electron paramagnetic resonance (e.p.r.) measurements, magnetic susceptibility measurements and thermoanalytical experiments. Except for the Cu compound, which is polynuclear, all compounds appear to be binuclear, with both bridging bidentate and non-bridging triazole ligands. The overall formula is M(Ettrz)2(NCS)2(H20)3/2 for Mn, Fe, Co and Ni. The copper and zinc compounds have the formula Cu(Ettrz)2(NCS)2 and Zn(Ettrz)3/2(NCS)2. 
  Reference    Z. Naturforsch. 36b, 802—808 (1981); received March 2 1981 
  Published    1981 
  Keywords    4-Ethyl-l, 2, 4-triazole, Ligand Field, Magnetic Exchange, Binuclear Complexes 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0802.pdf 
 Identifier    ZNB-1981-36b-0802 
 Volume    36 
169Author    Ger Vos, AnthonieJ. De Kok, GerritC. VerschoorRequires cookie*
 Title    Complexes of 1,2,4-Triazoles, Part XVII The Crystal Structure of Tris-/«-(4-ethyl-l,2,4-triazole-N l ,N 2 )- (4-ethyl-l,2,4-triazole-N 1 )-aquo-bis [bis(thiocyanato-N)- nickel(II)]hydrate, Ni2(C4N3H7)4(H20)(NCS)4 *H20 (x ~ 2.5)  
 Abstract    The crystal structure of Ni2(C4N3H7)4(H20)(NCS)4 • 2.5 H20 has been determined by X-ray diffraction techniques. The compound crystallizes in the monoclinic space group P2i/n with a — 15.121(4), 6= 13.237(2), c= 18.069(3), ß = 94.71(2)° and Z = 4; R = 0.040 (Rm = 0.051). The compound consists of dimeric units in which two Ni ions are bridged by three ethyltriazole (Ettrz) groups. For one Ni, two N donating NCS" groups and an Ettrz coordinating by only one N atom complete the NiNe octahedron. The other Ni atom, which is also octahedrally coordinated, has a coordinated water molecule instead of a monodentate Ettrz. 
  Reference    Z. Naturforsch. 36b, 809—813 (1981); received April 2 1981 
  Published    1981 
  Keywords    4-Ethyl-l, 2, 4-triazole, Binuclear Compound, Hydrogen Bonding 
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 Identifier    ZNB-1981-36b-0809 
 Volume    36 
170Author    Michael Svoboda, Heindirk Torn Dieck, Carl Krüger, Yi-Hung TsayRequires cookie*
 Title    Bis(diazadien)metall(0)-Komplexe, III [1] Nickel(0)-bis(chelate) mit aliphatischen N-Substituenten + Bis(diazadien)metal(0) Complexes, III [1] Nickel(0)-bis(chelates) with Aliphatic N-Substituents  
 Abstract    Diazadiene Nickel Complexes, X-ray, Non-tetrahedral Nickel(O) R 1 R 2 Diazadienes (DAD) R 3 -N = C—C = N-R 4 (with R 1 , R2 = H, CH3 and R 3 , R 4 = alkyl) form nickel complexes 1-14 with composition (DAD)2Ni. They can be prepared by ligand substitution from other Ni(O) compounds or, preferably, by the reduction of Ni(II) salts in the presence of DAD. Spectroscopic differences (NMR, UV) indicate different structures (type 1 and 2) for diamagnetic (DAD)2Ni of same composition, depending on substituents R!-R 4 . The steric requirement of R 3 , R 4 is most important as the main differences show up when going from tertiary (type 1: R2CH-N =) to secondary a-carbon (type 2: RCH2-N =). X-ray analysis of a type 1 complex (R 1 , R 2 = H, R 3 , R 4 = cyclo-hexyl) reveals two strictly orthogonal chelate rings (D2d) corresponding to (pseudo-)tetrahedrally coordinated Nickel(O). A D2-structure with smaller dihedral angle is discussed for type 2 complexes. 
  Reference    Z. Naturforsch. 36b, 814—822 (1981); eingegangen am 27. Mai 1980/5. März 1981 
  Published    1981 
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 Identifier    ZNB-1981-36b-0814 
 Volume    36 
171Author    Heindirk Tom Dieck, Michael Svoboda, Thomas GreiserRequires cookie*
 Title    Bis  
 Abstract    (diazadien)metall(0)-Komplexe, IV [1] Nickel(0)-bis(chelate) mit aromatischen N-Substituenten Bis(diazadiene)metal(0) Complexes, IV [1] Nickel(0)-bis(chelates) with Aromatic N-Substituents R1R2 With N-aromatic substituted diazadienes (DAD) R 3 -N=C—C = N-R 4 (R 1 , R 2 = H, CH3 and R 3 = R 4 = aryl) nickel(O) forms complexes of composition (DAD)2Ni which are prepared preferably by reduction of Ni(II) salts in the presence of DAD. The groups R 1 , R 2 and/or the o-substituents of the aryl system determine the conformation of the DAD and its sterical ligand properties. An X-ray structure analysis of (DAD)2Ni 17 (DAD = glyoxal-bis(2,6-dimethyl-phenylimine)) shows a dihedral angle of 44° between the two chelate planes. With twisted N-aryl substituents nickel seems to prefer planar coordination (formal low spin Ni(II)) of two DADs over tetrahedrally coordinated formal nickel(O) state. 
  Reference    Z. Naturforsch. 36b, 823—832 (1981); eingegangen am 27. Mai 1980 
  Published    1981 
  Keywords    Diazadien Nickel Complexes, Planar ^ Tetrahedral Interconversion, X-ray 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0823.pdf 
 Identifier    ZNB-1981-36b-0823 
 Volume    36 
172Author    Heinz-Dieter Sinnen, Hans-Uwe SchusterRequires cookie*
 Title    Rb4Au7Sn2, eine intermetallische Phase mit siebenatomigen Goldclustern Rb4Au7Sn2, an Intermetallic Phase with Sevenatomic Gold-Clusters  
 Abstract    Ternary Intermetallic Compound, Crystal Data In the course of our investigations of the ternary system Rb-Au-Sn we obtained the new compound Rb4Au?Sn2. Its crystal structure has been determined by single crystal X-ray diffraction data. It crystallizes in the hexagonal (rhombohedral) space group R~3m with unit-cell parameters a — 680.1(3) pm and c = 2909.0(7) pm, and Z = 3. The structure is similar to that of Laves-Phases of the MgCu2-type. 
  Reference    Z. Naturforsch. 36b, 833—836 (1981); eingegangen am 23. März 1981 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0833.pdf 
 Identifier    ZNB-1981-36b-0833 
 Volume    36 
173Author    A.-R Schulze, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Verbindungsbildung von MeO :M203. V Neue metastabile Verbindungen: BaSr2Y6012, BaSr2Er6012 und BaSr2Tm6012  
 Abstract    The new metastable compounds BaSr2YeOi2 (I), BaSr2Er60i2 (II) and BaSr2Tm60i2 (III) could be prepared with high temperature reactions (C02-Laser). The X-ray single crystal investigations lead to hexagonal symmetry, space group Ch-P63/m; lattice constants: I: o= 1029.9 c = 340.9 pm II: a = 1027.7 c = 338.5 pm III: a = 1021.5 c = 337.6 pm The crystal structure the formation of the compounds and the range of stabüity are discussed. 
  Reference    Z. Naturforsch. 36b, 837—839 (1981); eingegangen am 27. März 1981 
  Published    1981 
  Keywords    Barium, Strontium, Rare Earth, Oxide, Crystal Structure 
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 Identifier    ZNB-1981-36b-0837 
 Volume    36 
174Author    Elli Theodoridou, Dimitrios JannakoudakisRequires cookie*
 Title    Elektrochemisches Verhalten der Nitrophenole und ihrer Reduktionsprodukte an Graphitelektroden Electrochemical Behavior of the Nitrophenols and Their Reduction Products at Graphite Electrodes  
 Abstract    The electrochemical reduction of the isomeric nitrophenols at graphite electrodes is investigated in aqueous solutions with pH = 1-13 and is compared with the electro-chemical oxidation of their reduction products. o-Nitrophenol and jo-nitrophenol are reduced to the corresponding amines, as the observed oxidation peaks in their cyclic voltammograms can be simulated by those of o-and p-aminophenol. m-Nitrophenol is reduced to m -hydroxylaminophenol, as its oxidation peak appears at much more negative » potential than that of m-aminophenol, within the potential range of the oxidation of phenylhydroxylamine. The pH-dependence of the reduction potentials of the nitrophenols at the graphite electrodes is discussed in comparison with that at a hanging mercury drop electrode. 
  Reference    Z. Naturforsch. 36b, 840—845 (1981); eingegangen am 12. Februar 1981 
  Published    1981 
  Keywords    Cyclic Yoltammetry, Nitrophenols, Graphite Electrodes 
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 Identifier    ZNB-1981-36b-0840 
 Volume    36 
175Author    Jan Fulara, Tadeusz LatowskiRequires cookie*
 Title    Photochemical Reactions of Bromoanthracenes with N,N-Dimethylaniline in Solution  
 Abstract    Photochemical Reactions, Bromoanthracenes Major products of the photolysis of 9-bromoanthracene and 9,10-dibromoanthracene in benzene and acetonitrile as well as photochemical reaction products of the two bromo-anthracenes with N,N-dimethylaniline in these solvents have been isolated and identified. The mechanisms of partial reactions are discussed and attention is paid to the medium effect on the photochemical transformations. 
  Reference    Z. Naturforsch. 36b, 846—851 (1981); received June 25 1980 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0846.pdf 
 Identifier    ZNB-1981-36b-0846 
 Volume    36 
176Author    Klaus-Peter Zeller, Curt WentrupRequires cookie*
 Title    Azulen-Naphthalin-Umlagerung. Thermolyse von [4.7-13 C2] -Azulen Azulene-Naphthalene Rearrangement. Thermolysis of [4,7-13 C2] Azulene  
 Abstract    The mixture of 13 C2-labelled naphthalenes obtained by flash vacuum thermolysis of [4,7-13 C2] azulene (9) consists of [1,4-13 C2]-(14) and [2,10-13 C2] naphthalene (10) as major products and [l,3-13 C2]naphthalene (11) as a minor product. Traces of [1,6-13 C2]-(12) and [1,7-13 C2] naphthalene (13) are also detectable. The recently proposed vinylidene-norcaradiene mechanism [5] correctly predicts the major products. 
  Reference    Z. Naturforsch. 36b, 852—857 (1981); eingegangen am 15. April 1981 
  Published    1981 
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 Identifier    ZNB-1981-36b-0852 
 Volume    36 
177Author    Klaus-Peter Zeller, Stefan BergerRequires cookie*
 Title    Darstellung und Spektroskopische Charakterisierung von [4.7-13 C2]-Azulen Preparation and Spectroscopic Characterisation of [4,7-13 C2] Azulene 13 C Labelling of Azulene, Electron Impact Induced Carbon Scrambling, 13 C 13 C Spin Spin Coupling Constants  
 Abstract    A multistep synthesis of [4.7-13 C2] azulene (10) using Na 13 CN as source for the labelled carbon atom is described. The electron impact induced elimination of acetylene from the molecular ions of 10 proceeds with almost statistical participation of the carbon atoms, thus indicating an extensive scrambling of the azulene carbon skeleton prior to fragmenta-tion. From the 13 C NMR spectrum of 10, 13 C 13 C spin spin coupling constants have been determined. The measured values confirm our earlier interpretation of the transmission of the 13 C 13 C spin spin coupling constants in terms of a yr-mechanism. 
  Reference    Z. Naturforsch. 36b, 858—864 (1981); eingegangen am 15. April 1981 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0858.pdf 
 Identifier    ZNB-1981-36b-0858 
 Volume    36 
178Author    Bernd Richter, Helmut SchwarzRequires cookie*
 Title    Zur McLafferty-Umlagerung bei Radikalkationen von Phenylpyridylalkanonen [1] On the McLafferty Rearrangement of Ionized Phenyl Pyridyl Alkanones [1]  
 Abstract    A detailed investigation concerning the genesis of McLafferty rearrangement products from molecular ions of phenyl pyridyl alkanones reveals the following features: 1) The various products are not formed by competitive dissociations of the molecular ion. Most of the relevant fragment ions are generated from the primary McLafferty product of a hydrogen transfer to the ionized carbonyl group (M +> ->m/z 163, ion k). The ion k plays a decisive role for the generation of the abundant product ions at m/z 93 (ion g) and m/z 106 (ion s) both of which are formed by further dissociation of k. Details of the mechanisms for the decomposition of k are obtained by investigating [D]-labelled isotopomers, the analysis of low and high resolution data, the application of MIKE and CA spectra. The problem of keto/enol tautomerism between some ions, relevant in this context, is discussed and it is shown that these isomerization processes are not involved. A detaüed description is given for the syntheses of various [D]-labelled phenyl pyridyl alkanones. 
  Reference    Z. Naturforsch. 36b, 865—877 (1981); eingegangen am 16. Dezember 1980 
  Published    1981 
  Keywords    Mass Spectrometry, Hydrogen Rearrangement, Keto Enol Tautomerism, Metastable Ions, Collisional Activation 
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 Identifier    ZNB-1981-36b-0865 
 Volume    36 
179Author    H. J. Opferkuch, W. Adolf, B. Sorg, S. Kusumoto+, E. HeckerRequires cookie*
 Title    Zur Chemie des Ingenols, I Ingenol und einige seiner Derivate On the Chemistry of Ingenol, I Ingenol and Some of its Derivatives  
 Abstract    The tetracyclic polyfunctional diterpene ingenol (1) is the prototype of many di-terpenoid parent alcohols of the ingenane type. Esters of these parent alcohols occur -partly together with esters of polyfunctional diterpene parent alcohols of the tigliane and daphnane type -as irritant, cocarcinogenic and antineoplastic principles in species of the family Euphorbiaceae (Spurge). Preparation of 1 from latex of Euphorbia ingens E.May as well as of some functional derivatives of 1 are described. 
  Reference    Z. Naturforsch. 36b, 878—887 (1981); eingegangen am 2. März 1981 
  Published    1981 
  Keywords    Cocarcinogens, Diterpene Esters, Euphorbiaceae, Tumor Promoters 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0878.pdf 
 Identifier    ZNB-1981-36b-0878 
 Volume    36 
180Author    Maria Konieczny, George Sosnovsky, Peter GutierrezRequires cookie*
 Title    In the Search for New Anticancer Drugs, I Antitumor Activity of Various Nitroxyl-and Aziridine-Containing Phosphorus Compounds  
 Abstract    Antitumor Activity, Phosphorus Compounds A series of pentavalent phosphorus compounds containing the nitroxyl and/or aziridinyl moieties was evaluated for antitumor activity against P 388 and L 1210 lymphocytic leukemias, and compared to the clinical agent thio-TEPA (1). The compounds with the structures 5-13 were found to be active, with a T/C value greater than 125. The percent ILS was also determined. P(S)(N^)3 1 (R0)2P(0)F<] 7 ROP(S){<3)2 0-(&0>2P(S)<] 8 R0P(0F ^ YK H 6 ([>)2P(0)0-<QV-0H 
  Reference    Z. Naturforsch. 36b, 888—891 (1981); received February 4 1981 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0888.pdf 
 Identifier    ZNB-1981-36b-0888 
 Volume    36 
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