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1979 (382)
41Author    Jürgen Weis, Herbert SchäferRequires cookie*
 Title    Na3(AlSi)Te4 -das erste Hypotelluroalumosilikat Na3(AlSi)Te4 -the First Hypotelluroalumosilicate  
 Abstract    Na3(AlSi)Te4 has been prepared and analytically characterized. The compound is mo-noclinic, C2/m, with a = 747 ± 1 pm, b = 434 ± 1 pm, c = 852 ± 1 pm, ß = 107.4° ±0.1. The structure can be described as a variant of the a-NaFe02-type. One half of the octa-hedral sites is occupied by Na ions while in the other half of these holes Na ions and Al-Si-dumbbells in the ratio 1:1 are randomly distributed. 
  Reference    Z. Naturforsch. 34b, 176—178 (1979); eingegangen am 31. Oktober 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0176.pdf 
 Identifier    ZNB-1979-34b-0176 
 Volume    34 
42Author    Herbert Binder, Jürgen PalmtagRequires cookie*
 Title    Synthesen und Reaktionen von 4-Bora-2.6-diphospha-1.3.5-triazenen Cyclische Borbetaine Synthesis and Reactions of 4-Bora-2,6-diphospha-l,3,5-triazenes Cyclic Boron Betaines  
 Abstract    By substitution of chlorine in the title compound 2,2,4,4,6,6-hexachloro-3,5-dimethyl-4-bora-2,6-diphospha-l,3,5-triazene (1) new members of this class of compounds are synthesized. In most cases reaction starts first on the boron site. The ring reactivity can be accounted for in terms of the charge distribution in the heterocycle 1. In 1 the coupling 2 J(31 P-N-n B) could be detected for the first time. A mechanism for the ring formation is discussed. 
  Reference    Z. Naturforsch. 34b, 179—187 (1979); eingegangen am 15. Juni/4. Oktober 1978 
  Published    1979 
  Keywords    Ring Reactivity, Substitution Reactions, 4-Bora-2, 6-diphospha-l, 3, 5-triazenes 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0179.pdf 
 Identifier    ZNB-1979-34b-0179 
 Volume    34 
43Author    Michaela Zuckmantel, R. Kurth, H. P. BoehmRequires cookie*
 Title    Kohlenstoffe als Katalysatoren für die Oxydation von schwef liger Säure Carbons as Catalysts for the Oxidation of Sulfurous Acid  
 Abstract    Conductometric measurements of the catalytic oxydation of dilute aqueous sulfurous acid were used in the comparison of various carbon catalysts, e.g. active charcoals and carbon blacks. The oxidation rate is proportional to (Po2) 1/2 and to the amount of adsorbed HSO3-ions. Basic surface oxides are responsible for the HSO3 -adsorption. The catalytic activity of a carbon is influenced also by other factors than the concentration of basic surface oxides. It is changed by heat treatment of the carbon as well as by chemical treatment of its surface. Treatment with ammonia at 600 °C increases its activity dramatically, absolutely inactive carbon blacks were rendered highly active. 
  Reference    Z. Naturforsch. 34b, 188—196 (1979); eingegangen am 11. Juli 1978 
  Published    1979 
  Keywords    Carbon Catalysts, Catalytic Oxidation, Sulfur Dioxide, Sulfurous Acid, Surface Oxides of Carbon 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0188.pdf 
 Identifier    ZNB-1979-34b-0188 
 Volume    34 
44Author    HerbertW. Roesky, Wilfried Schmieder, Klaus AmbrosiusRequires cookie*
 Title    Über Additionsreaktionen von zinnorganischen Verbindungen mit N.N' -Bis(pentafluorphenyl)-sehwefeldiimid Addition Reactions of Tinorganic Compounds with N,N'-Bis(pentafluorophenyl)sulfurdiimide  
 Abstract    The reactions of N,N / -bis(pentafluorophenyl)sulfurdiimide with [(CH3)3Sn]2NCH3, [(CH3)3Sn]3N and [(CHg^SnJaNCeFs yiels the 1:1 adducts 1-3. *H and 19 F NMR investiga-tions show, that fluorine atoms in the ortho position of the phenyl ring coordinate to the tin atom. This causes an increase of electron density at tin. A similar interpretation is given for the adduct 4 of N,N'-bis(^-chlorophenylsulfonyl)sulfurdiimide and [(CH3)3Sn]2NCH3, where an oxygen atom of the sulfonyl group is bonded to tin. 
  Reference    Z. Naturforsch. 34b, 197—199 (1979); eingegangen am 28. September 1978 
  Published    1979 
  Keywords    Pentafluorophenyl Derivatives, Tin, Coordination Compounds 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0197.pdf 
 Identifier    ZNB-1979-34b-0197 
 Volume    34 
45Author    Wolfgang Beck, Timm Kemmerich, Heiko BöhmeRequires cookie*
 Title    Azido-chelatkobalt(III)-Komplexe [1] Azido Chelate Cobalt(III) Complexes [1]  
 Abstract    The preparation and characterization of a series of azido chelate complexes of cobalt(III), N3Co(chel)2B (chel = anionic bidentate ligand, B = base e.g. PPh3, P(OEt)3) and N3Co(chel')B (chel' = anionic tetradentate ligand) is reported. In addition, analogous chelate cobalt(III) complexes containing the pesudo halides NCO~, NCS -, CN -, C = CR", C(CN)3~, CH2N02" have been prepared. 
  Reference    Z. Naturforsch. 34b, 200—207 (1979); eingegangen am 17. Juli 1978 
  Published    1979 
  Keywords    Azido Chelate Complexes, Cobalt(III), Pseudohalide Complexes 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0200.pdf 
 Identifier    ZNB-1979-34b-0200 
 Volume    34 
46Author    Etelka Farkas, BedaE. Fischer, Rolf Griesser, VolkerM. Rheinberger, Helmut SigelRequires cookie*
 Title    Ternary Complexes in Solution, XXX [1] Increased Stability Through Intramolecular Stacking in Mixed-Ligand Cu 2+ and Zn 2+ Complexes of 2,2' -Bipyridyl and Carboxymethyl Aryl Derivatives  
 Abstract    The stability constants of ternary Cu 2+ and Zn 2+ complexes, each of which contains 2,2'-bipyridyl and a carboxymethyl aryl sulfide, were determined in 50% aqueous dioxane. A comparison of the stability of these ternary complexes with those formed with simple carboxylates demonstrates an enhanced stability of the carboxymethyl aryl sulfide containing mixed ligand complexes. This enhanced stability is not due to a thioether-metal ion interaction, but due to an intramolecular aromatic stacking interaction between the aryl moiety of the carboxymethyl aryl sulfide and 2,2'-bipyridyl. Indeed, by UV difference spectra and by PMR measurements it is possible to show that a binary (metal ion-free) stacked adduct between the aromatic moieties of the two mentioned ligands is formed. Furthermore, by studying the binary and ternary systems of Zn 2+ or Cu 2+ , 2,2'-bipyridyl and hydrocinnamate, i.e. 3-phenylpropionate (-S-of carboxymethyl phenyl sulfide is replaced by -CH2-), it becomes obvious that the thioether moiety is not essential for the observation of an enhanced stability of the ternary complexes. PMR shift studies of 2,2'-bipyridyl/Zn 2+ /carboxymethyl aryl sulfide systems confirm the presence of stacking in the corresponding ternary complexes. Depending on the kind of the ternary metal ion complex the stability enhancement, due to the intramolecular stacking between the aro-matic parts of the coordinated ligands, is between about 0.2 to 0.5 log unit. 
  Reference    Z. Naturforsch. 34b, 208—216 (1979); received September 1 1978 
  Published    1979 
  Keywords    Mixed-Ligand Complexes, Stacking Interactions, 2, 2'-Bipyridyl, 3-Phenylpropionate, Carboxymethyl Aryl Sulfides 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0208.pdf 
 Identifier    ZNB-1979-34b-0208 
 Volume    34 
47Author    Volker Küllmer, Erika Röttinger, Heinrich VahrenkampRequires cookie*
 Title    Phosphinsubstituierte Carbonyl-Seleno-Komplexe des Mangans und Rheniums Phosphine Substituted Carbonyl Seleno Complexes of Manganese and Rhenium  
 Abstract    The selenium bridged complexes [(CO)4M-SeX]2 (M = Mn, Re; X = H, SnMe3) were converted by trimethylphosphine to the dimers [Me3P(CO)3M-SeX]2 and/or the monomers (Me3P)2(CO)3M-SeX. The obtained Se-SnMe3 compounds reacted with HCl to form the SeH compounds. The structures of the new complexes were deduced from their IR and NMR spectra. [(Me3P)2(CO)3Re]2Se, the first monobridged bis-earbonylmetal chalcogenide, was obtained as a byproduct and confirmed by a crystal structure analysis. Die metallorganischen Lewis-Basen des Typs 
  Reference    Z. Naturforsch. 34b, 217—223 (1979); eingegangen am 29. September 1978 
  Published    1979 
  Keywords    Dimeric Complexes, Monomerie Complexes, Crystal Structure, Carbonyl Seleno Complexes 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0217.pdf 
 Identifier    ZNB-1979-34b-0217 
 Volume    34 
48Author    Volker Küllmer, Erika Röttinger, Heinrich VahrenkampRequires cookie*
 Title    Oxidation von Mercapto-Carbonyl-Mangankomplexen Oxidation of Mercapto Carbonyl Manganese Complexes  
 Abstract    Chemical oxidation of the mercapto carbonyl manganese complexes (Me3P)2(CO)3Mn-SX (1), (Me3P)2(CO)5Mn2(SX)2 (2), and (CO)8Mn2(SX)2 (3) (X = H, SnMe3) were investigated. From the SH complexes no identifiable products could be obtained. For X = SnMe3, the iodine oxidation of 2 yielded (Me3P)2(CO)5Mn2S2 (5), that of 3 gave (CO)i5Mn4S4 (7), both containing bridging disulfide ligands. The crystal structure of 7 was determined. 
  Reference    Z. Naturforsch. 34b, 224—229 (1979); eingegangen am 29. September 1978 
  Published    1979 
  Keywords    Chemical Oxidation, Mercapto Ligands, Disulfide Ligands, Crystal Structure 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0224.pdf 
 Identifier    ZNB-1979-34b-0224 
 Volume    34 
49Author    M. M. Aly, A. M. ShalabyRequires cookie*
 Title    The Isolation and Characterization of Molecular Complexes Produced from the Reaction of Nitrophenols with Divalent Metal Oxinates  
 Abstract    The reaction of nitrophenols (picric acid, 2,6-dinitrophenol, and 2,4-dinitrophenol) with divalent metal oxinate (metal = Cu, Co, Ni, Mn, and Zn) produced a type of molecular complex, which comprises two molecules of the metal oxinate and one molecule of the nitrophenol. In the case of the Mg complex the ratio is 1:1. A definite charge-transfer band is detected for the Co(II) complex. A hydrogen bonding system 0I...H+...02 is suggested. This includes the proton of the nitrophenol and two oxygen atoms; each is related to a coordinated oxinate of two different metal oxinate molecules. Analytical and spectral evidence are in accordance with the tentatively suggested formulations. 
  Reference    Z. Naturforsch. 34b, 230—234 (1979); received July 31 1978 
  Published    1979 
  Keywords    Nitrophenols, Divalent Metal Oxinates, Molecular Complexes 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0230.pdf 
 Identifier    ZNB-1979-34b-0230 
 Volume    34 
50Author    Bernd WrackmeyerRequires cookie*
 Title    3 C-und 119 Sn-NMR-Spektren von Thienylstannanen 13 C and 119 Sn NMR Spectra of Thienylstannanes  
 Abstract    The assignment of some 13 C chemical shifts in 2-thienylstannanes has to be reversed. Proton coupled 119 Sn NMR spectra are shown to be useful to detect long range Sn-H coupling, not readily obtained from complex *H NMR spectra. 
  Reference    Z. Naturforsch. 34b, 235—237 (1979); eingegangen am 23. Oktober 1978 
  Published    1979 
  Keywords    Thienylstannanes, NMR, Sn-H Long Range Coupling 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0235.pdf 
 Identifier    ZNB-1979-34b-0235 
 Volume    34 
51Author    Manfred Zabel, Sigrid Wandinger, Klaus-Jürgen RangeRequires cookie*
 Title    Ternäre Chalkogenide M3M2'X2 mit Shandit-Struktur Ternary Chalcogenides M3M2'X2 with Shandite-Type Structure  
 Abstract    Metal-rich ternary chalcogenides M3M2'X2 (M = Ni, Co, Pd, Rh; M' = In, Tl, Pb, Sn; X = S, Se) with Shandite-type structure were synthesized from mixtures of the elements and/or binary components. A single-crystal investigation on Co3ln2S2 verifies the rhombo-hedral unit cell of Shandite-type compounds, originally postulated by Peacock and McAndrew (Crystal data for Co3ln2S2: Rhombohedral, space group R3m; a = 549,31 (6) pm, a = 57.89°, Z= 1; 3 Co in 3d, 1 In(l) in la, 1 In(2) in lb, 2 S in 2c with x = 0.2790). 
  Reference    Z. Naturforsch. 34b, 238—241 (1979); eingegangen am 20. Oktober 1978 
  Published    1979 
  Keywords    Metal-rich Ternary Chalcogenides, Shandite-type, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0238.pdf 
 Identifier    ZNB-1979-34b-0238 
 Volume    34 
52Author    Karl Wieghardt, Udo QuilitzschRequires cookie*
 Title    Zur Strukturchemie der Diperoxovanadate(V): Das //-Hydroxo-bis [oxo-diperoxovanadat(Y)] Anion Studies on Diperoxovanadates: The //-Hydroxo-bis [oxo-diperoxovanadate(V)] Anion  
 Abstract    iu-Hydroxo-bis[oxo-diperoxovanadate(y)], Diperoxovanadates(V) Depending on the pH and the respective concentrations of solutions containing NH4+/NH3/H202/NH4V03 three yellow ammonium salts can be isolated: (NH4)4[0(V0(02)2)2], NH4[V0(02)2NH3]; and the novel (NH4)3[HV20ii] • 2 H20. A cesium and potassium salt of the latter anion have been prepared. The infrared spectra of these salts are interpreted assuming a //-hydroxo-bis[oxo-diperoxovanadate(V)] struc-ture in the solid state. 
  Reference    Z. Naturforsch. 34b, 242—244 (1979); eingegangen am 27. September 1978 
  Published    1979 
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 Identifier    ZNB-1979-34b-0242 
 Volume    34 
53Author    H. J. Keller, R. LehmannRequires cookie*
 Title    Planare Komplexe von unsymmetrisch substituierten Alkyl- und Aryl-a./5-diondioximen mit den Ionen Nickel(II), Palladium(II) und Platin(II) Planar Complexes of Unsymmetrically Substituted Alkyl and Aryl-l,2-dionedioximes with the Ions Nickel(II), Palladium(II) and Platinum(II)  
 Abstract    A series of new planar bis(a,/?-dionedioximato)metal(II) complexes of the ions Ni(II), Pd(II), Pt(II) using unsymmetrically substituted glyoximes as ligands are reported. 
  Reference    Z. Naturforsch. 34b, 245—250 (1979); eingegangen am 26. Oktober 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0245.pdf 
 Identifier    ZNB-1979-34b-0245 
 Volume    34 
54Author    Erwin Brechtel, Gerhard Cordier, Herbert SchäferRequires cookie*
 Title    Zur Darstellung und Kristallstruktur des SrZnSb2 On the Preparation and Crystal Structure of SrZnSb2  
 Abstract    SrZnSb2 has been prepared and characterized analytically and structurally. The compound crystallizes in the orthorhombic system with a = 2305 ± 5 pm, b = 437 ± 1 pm, c = 446 i 1 pm, Pnma-D|j>. Zn-and Sb-atoms form distorted fourfold pyramids, con-nected by common edges in the basis to two-dimensional sheets. These sheets are sepa-rated by double layers of Sr-atoms in which further Sb-atoms are located building four-cornered networks. 
  Reference    Z. Naturforsch. 34b, 251—255 (1979); eingegangen am 5. Oktober 1978 
  Published    1979 
  Keywords    Intermetallic Compound, Crystal Structure, Ternary Antimonide 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0251.pdf 
 Identifier    ZNB-1979-34b-0251 
 Volume    34 
55Author    Siegfried PohlRequires cookie*
 Title    von Diazadiphosphetidin-Derivaten: Fünf Kristall-und Molekülstrukturen Cis-trans Isomers of Diazadiphosphetidine Derivatives: Five Crystal and Molecular Structures  
 Abstract    The crystal structures of the compounds [R3CP(X)NR]2 (R = CH3; X = S, Te for eis 
  Reference    Z. Naturforsch. 34b, 256—261 (1979); eingegangen am 11. Oktober 1978 
  Published    1979 
  Keywords    Cis-trans Isomerism, Diazaphosphetidine Derivatives, Crystal Structures 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0256.pdf 
 Identifier    ZNB-1979-34b-0256 
 Volume    34 
56Author    Eberhard Stumpp, Uwe HillebrandRequires cookie*
 Title    Ligandenfeldspektroskopische Untersuchungen an Übergangsmetall -Aluminium -Tetraalkoxiden Ligand Field Spectroscopic Studies of Transition Metal Aluminium-Tetraalkoxides  
 Abstract    The preparation and the electronic spectral properties of compounds M[A1(0R)4]2 (M = Co, Ni, Cu and R = CH3, C2H5, n-CsIU, n-CjHg) are described. The spectral data are used in conjunction with ligand field theory in deducing the structures of the compounds. The spectrum of green Ni[Al(OR)4]2 is interpreted as a Ni(OR)6 octahedron sharing faces with two Al(OR)4 tetrahedrons. It is proposed that Co 2+ and Cu 2+ are in a distorted octahedral coordination. The alkoxide ligands have been fitted into the spectrochemical and the nephelauxetic series. They are close to H2O in this series. 
  Reference    Z. Naturforsch. 34b, 262—265 (1979); eingegangen am 9. 0ktober/20. November 1978 
  Published    1979 
  Keywords    Transition Metal Aluminium-Tetraalkoxides, Ligand Field Spectra, Molecular Structure, Spectrochemical Series, Nephelauxetic Series 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0262.pdf 
 Identifier    ZNB-1979-34b-0262 
 Volume    34 
57Author    Walter FabianRequires cookie*
 Title    Semiempirische SCF-Rechnungen zur Hydroxypyridin-Pyridon-Tautomerie Semiempirical SCF-Calculations on the Hydroxypyridine-Pyridone-Tautomerism  
 Abstract    Hydroxypyridin-pyridone-tautomerism, UV, CNDO/CI-calculations, MINDO/2-calculations The electronic spectra of a series of substituted 4-hydroxypyridones are calculated by the CNDO/CI-method. Best agreement between observed and calculated transition energies is obtained when the geometry of the pyridone-form is assumed. In addition, MINDO/2-calculations predict the pyridone tautomer to be the more stable one in most cases. 
  Reference    Z. Naturforsch. 34b, 266—270 (1979); eingegangen am 10. Oktober 1978 
  Published    1979 
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 Identifier    ZNB-1979-34b-0266 
 Volume    34 
58Author    Arnd Vogler, Alfred KernRequires cookie*
 Title    Photoredox Reaction of Jrans-4-Stilbenecarboxylatopentaamminecobalt(III)  
 Abstract    The irradiation (A = 313nm) of aqueous [Co(III)(NH3)5TSC] 2 + (TSC -= transA-stilbenecarboxylate) leads to a redox reaction with formation of Co 2+ as has been shown previously. The TSC -ligand is oxidized to the radical in the primary photoreaction. At higher complex concentrations IO -2 M) this TSC radical is oxidized to stable products (0 = 0.09 ± 0.02) by [Co(NH3)5TSC] 2 +, which is reduced to Co 2 + leading to release of the TSC" ligand (0 = 0.07 ± 0.02). Co 2 + is thus formed by both the secondary and the primary photochemical reaction (ÖWraii = 0.16). At low complex concentrations (< 10 -4 M) in the presence of air, the primary TSC radical is scavenged by O2. Benz-aldehyde is an oxidation product. This reduces the formation of Co 2 + to 0 = 0.09 ± 0.02, which is taken to be the efficiency of the primary photochemical step. It is suggested that the photoredox reaction is initiated by an electron transfer from the first excited singlet of the TSC -ligand. As shown by sensitization experiments, the population of the lowest TSC -triplet leads to the usual trans/cis isomerization of the TSC -ligand, but not to the redox reaction. 
  Reference    Z. Naturforsch. 34b, 271—274 (1979); received November 13 1978 
  Published    1979 
  Keywords    Redox Reaction, Photochemistry, Cobalt(III) Complex, Stilbenecarboxylate 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0271.pdf 
 Identifier    ZNB-1979-34b-0271 
 Volume    34 
59Author    MohamedHilmy Elnagdi, Mohamed Ezzat, KamalUsef Kandeel, SadekRequires cookie*
 Title    Reactions with Cyclic Amidenes III: Synthesis of Some New Fused Pyrazole Derivatives  
  Reference    Z. Naturforsch. 34b, 275—279 (1979); received August 28 1978 
  Published    1979 
  Keywords    Diazobetaienes, Dipolarcycloaddition, Pryazolo[4, 3-c]-l, 2, 3, 4-tetrazines, Ethoxycarbonyl Isothiocyanate, X H NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0275.pdf 
 Identifier    ZNB-1979-34b-0275 
 Volume    34 
60Author    Hans Junek, Martin MittelbachRequires cookie*
 Title    Synthesen mit Nitrilen, LIV [1] Reduktion von Oximinomalonitril zu Aminomalonitril mittels Raney-Katalysatoren Syntheses with Nitriles, LIV [1] Reduction of Oximinomalonitrile to Aminomalonitrile Using Raney-Catalysts  
 Abstract    An improvement of the synthesis of aminomalononitrile (2) can be achieved by using Raney-catalysts for the reduction of oximinimalonitrile at a H2-pressure of 4 atm and 20 °C. Due to the reactivity of oximinomalonitrile some new derivatives of oximinocyano-acetamide are obtained by O-and N-acylation. Condensation of 2 with benzilmonoxime leads to 2-amino-5,6-diphenyl-pyrazine-carbonitrile, with N-phenyl-formamidate 2-amino-2,2-dicyano-l-(N-phenylimino)-acetaldehyde (10) is yielded. Oximinomalonitrile, Aminomalononitrile, Oximinocyanoacetamide 
  Reference    Z. Naturforsch. 34b, 280—282 (1979); eingegangen am 19. Oktober 1978 
  Published    1979 
  Keywords    Aminomalonitrile, Oximinocyanoacetamide, Raney-Catalysts 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0280.pdf 
 Identifier    ZNB-1979-34b-0280 
 Volume    34 
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