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1983[X]
101Author    Detlef GeffRequires cookie*
 Title    Imidazole Catalyzed Transformation of 2-Arylmethylperhydro-l,5,2-dioxazine- 3,6-diones into 4-Oxazolidinones  
  Reference    Z. Naturforsch. 38b, 531—534 (1983); eingegangen am 23. November 1982 
  Published    1983 
  Keywords    2 -Ary lmethy lperhydro -1, 5, 2 -dioxazine -3, 6-diones, Imidazole, Thermolysis, 4-Oxazolidinones, Glyoxylamides 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0531_n.pdf 
 Identifier    ZNB-1983-38b-0531_n 
 Volume    38 
102Author    H.E JRequires cookie*
 Title    Atta-ur-Rahman* and Mumtaz Sultana  
 Abstract    A new one step synthesis of ß-carbolines is described, which involves the direct conversion of N-imidotryptamines to the corresponding lactams on reaction with P2S5. 
  Reference    Z. Naturforsch. 38b, 535—536 (1983); received November 18 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0535_n.pdf 
 Identifier    ZNB-1983-38b-0535_n 
 Volume    38 
103Author    Marianne Baudler, Jochen Hellmann, Thomas SchmidtRequires cookie*
 Title    Beiträge zur Chemie des Phosphors  
 Abstract    The reaction of tris(bromo-ter£-butylphosphino)phosphane, P(£-BuPBr)3, with lithium aluminium hydride leads to the title compound P(£-BuPH)3 (1), which could be isolated in a pure state. 1 is the first partially substituted derivative of iso-tetraphosphane(6), P(PHs)3, and was characterized in all details. Because of the chirality of the Z-BuPH-groups, 1 forms two diastereomers with RRS(SSR)-and RRR(SSS)-configuration in a ratio of about 3:1. The conformation of both isomers, which could be deduced from the 31 P NMR parameters, is mainly determined by the steric situation of the molecule. 
  Reference    Z. Naturforsch. 38b, 537—542 (1983); eingegangen am 23. Dezember 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0537.pdf 
 Identifier    ZNB-1983-38b-0537 
 Volume    38 
104Author    Ralf SteudelRequires cookie*
 Title    Barrier to Rotation about Sulfur-Sulfur Bonds in Homocyclic Sulfur Molecules [1]  
 Abstract    It is shown that the distances (d) of the 19 longest bonds in 9 homocyclic sulfur rings of type Sn (n = 6-20) depend on the torsional angles (r) which vary between 0° and 140°. The function d = f (r) is smallest for r = 90-100° and largest for r = 0°; the corresponding bond distance variation amounts to 13 pm or 6%. The height of the torsional cis-barrier is estimated from the enthalpy of formation of gaseous S7 as equal to or smaller than 24 kJ/mol. 
  Reference    Z. Naturforsch. 38b, 543—545 (1983); received January 18 1983 
  Published    1983 
  Keywords    Elemental Sulfur, Sulfur Rings, Sulfur-Sulfur Bonds, Torsional Barrier, Bond Distances 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0543.pdf 
 Identifier    ZNB-1983-38b-0543 
 Volume    38 
105Author    WolfPeter Fehlhammer, Wolfgang BeckRequires cookie*
 Title    Cycloaddition von Schwefelkohlenstoff  
 Abstract    an die Azidliganden in (Ph3P)2Pd(N3)2 und [Co(N3)4] 2 ~ [1] Cycloaddition of Carbon Disulfide to the Azide Ligands of (Ph3P)2Pd(N3)2 and [Co(N3)4] 2 - Thiatriazolinethionato Complexes, Isotliiocyanato Complexes, Palladium(II), Cobalt(III) (Ph3P)2Pd(N3)2 reacts with CS2 by 1,3-dipolar cycloaddition to give the thiatriazoline-5-thionato complex (Ph3P)2Pd(N3CS2)2. From the reaction of [Ph4As]2[Co(N3)4] with CS2, the isotliiocyanato complex [Ph4As]2[Co(NCS)4] has been isolated, and the intermediate thiatriazoline-5-thionato complex [Ph4As]2[Co(N3CS2)4] could be detected by its electronic spectrum. 
  Reference    Z. Naturforsch. 38b, 546—548 (1983); eingegangen am 25. Januar 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0546.pdf 
 Identifier    ZNB-1983-38b-0546 
 Volume    38 
106Author    Karl-Friedrich Tebbe, Roland FröhlichRequires cookie*
 Title    Untersuchungen an Polypseudohalogeniden, II [1] Darstellung und Kristallstruktur des Rubidiumdicyanotriiodids, Rb[I(ICN)2] Preparation and Crystal Structure of Rb[I(ICN)2]  
 Abstract    The new compound Rb[I(ICN)2] can be prepared in aqueous solution by simple addition of two mole equivalents of ICN to one formula unit Rbl. The solid is isotypic with CS[I(ICN)2] and crystallizes in the orthorhombic space group Pmmn with a = 16.246 A, b = 6.795 A, c = 4.397 A and Z = 2. The crystal structure has been solved from diffracto-meter data and refined to R = 0.035 for 313 observed reflections. The structure may be interpreted as a layer-like package of Rb+ cations and pentahalide-analogous anions [I(ICN2]~. The anionic groups are angular with symmetry mm 2 and y(I-I--I) = 128.69°, 0>(I--I-C) = 175.5°, <p(I-C-N) = 177°, d(I~-I) = 3.271 A, d(I-C) = 2.11 A, d(C-N) = 1.13 A. The cation is surrounded by a distorted cube of iodine atoms with a minimum distance d(Rb-I) = 3.775 Ä. Some additional results on the reactions of alkali halides and halogenocyans in different solvents are mentioned and compared with those described elsewhere. 
  Reference    Z. Naturforsch. 38b, 549—553 (1983); eingegangen am 14. Februar 1983 
  Published    1983 
  Keywords    Rubidiumdicyanotriiodide, Polypseudohalide, Pseudopentahalide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0549.pdf 
 Identifier    ZNB-1983-38b-0549 
 Volume    38 
107Author    New Monocyclic Acyloxyfluoroboranes, Herbert Binder, Walter Matheis, Hans-Jörg Deiseroth, Han Fu-Son, ProfH. Dr, W. Binder, MatheisRequires cookie*
 Title    Über neue monocyclische Acyloxyfluoroborane 2.2.6.6-Tetrafluoro-1.4-dialkyl-1.3.5-trioxa-1.6-diboracyclohexene: Darstellung, Molekül-und Kristallstruktur  
 Abstract    Acyloxyfluoroboranes Trimeric alkoxydifluoroboranes (F2BOR)3 (2) react with organic acid anhydrides by substitution of a ring group OR forming monocyclic acyloxyfluoroboranes of the type 2,2,6,6-tetrafluoro-l,4-dialkyl-l,3,5-trioxa-2,6-diboracyclohexene (3). The X-ray crystal structure determination of 3a shows two conformational isomers: two planar and two non-planar six-membered rings are present in the unit cell. The ring conformation is influenced by weak intermolecular H — F interactions. 
  Reference    Z. Naturforsch. 38b, 554—558 (1983); eingegangen am 15. November 1982/26. Januar 1983 
  Published    1983 
  Keywords    6, 6-Tetrafluoro-l, 4-dialkyl-l, 3, 5-trioxa-2, 6-diboracyclohexenes: Synthesis, Molecular and Crystal Structure 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0554.pdf 
 Identifier    ZNB-1983-38b-0554 
 Volume    38 
108Author    Ulrich Müller, Paul KlingelhöferRequires cookie*
 Title    /3-NbBr5, eine neue Modifikation von Niobpentabromid mit einer eindimensionalen Lagenfehlordnung ß-NbBrs, a New Modification of Niobium Pentabromide Having One-Dimensional Stacking Disorder  
 Abstract    While trying to react NbBrs with sulfur in a closed tube, crystals of the new modification /?-NbBra were obtained. Its X-ray diffraction patterns have sharp reflexions and diffuse streaks showing the presence of a one-dimensional disorder. From the sharp reflexions alone, a statistically averaged sub-structure results; it has the space group Ccmm and the lattice constants ao = 644, bo = 1867 and Co = 615 pm. Taking into account the diffuse streaks, the true structure was deduced; its lattice constants are a = 2ao, c = Co, b indefinite due to the disorder. /?-NbBrs is isostructural to tantalum pentaiodide. It consists of layers of (NbBrs)2 molecules that are stacked with displacement faults in the direction of b. The bromine atoms have a hexagonal close-packing arrangement. 
  Reference    Z. Naturforsch. 38b, 559—561 (1983); eingegangen am 25. Januar 1983 
  Published    1983 
  Keywords    Niobium Pentabromide, Crystal Structure, Stacking Faults 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0559.pdf 
 Identifier    ZNB-1983-38b-0559 
 Volume    38 
109Author    BharatB. Kaul, D. SellmannRequires cookie*
 Title    Transition Metal Complexes with Sulfur Ligands, IV [1] Synthesis and Reactions of Mo (IV) Complexes with the Tetradentate Thioether-thiol Ligand 2,3,8,9-Dibenzo-l,4,7,10-tetrathiadecane  
 Abstract    Synthesis and characterization of non-oxo Mo(IV) complexes with the tetradentate thioether-thiol ligand 2,3,8,9-dibenzo-l,4,7,10-tetrathiadecane(dttd-H2) are reported. MoCl4(THF)2 reacts with dttd-H2 in THF at room temperature to give the paramagnetic (2.61 BM, 295 K) [Mo(dttd)Cl2]. The chlorine ligands in [Mo(dttd)Cl2] can be substituted by sulfur ligands yielding diamagnetic complexes as [Mo(dttd)(CeH4S2)], [Mo(dttd)(SC2HiS)] and [Mo(dttd)(SC2H5)2]; with Na2S, NaHS or H2S, the di-^-sulfido bridged complex [(dttd)Mo(S)2Mo(dttd)] is obtained. The reduction of [Mo(dttd)Cl2] by various reducing agents in the presence of CO or NO yields labile carbonyl and nitrosyl species in solution. In contrast to [Mo(dttd)Cl2], the complexes with MoSe cbromophores showed no reactivity to CO or NO under reducing conditions. 
  Reference    Z. Naturforsch. 38b, 562—567 (1983); received January 19 1982 
  Published    1983 
  Keywords    Molybdenum(IV) Sulfur Complexes, Synthesis, Reactions 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0562.pdf 
 Identifier    ZNB-1983-38b-0562 
 Volume    38 
110Author    Thomas Mack, Karl Peters, Hans-Georg Von SchneringRequires cookie*
 Title    Zur Stereochemie von Diazadien-Metall-Komplexen, V [1] Molekülstrukturen und CO-Kraftkonstanten nicht-starrer Chrom-, Molybdän- und Wolframcarbonylderivate DAD M(CO)3(*CO) (*C0 = 12 C0, 13 C0, C 18 0) Stereochemistry of Diazadiene Metal Complexes, V [lj Molecular Structures and CO Force Constants of Non-Rigid Chromium, Molybdenum and Tungsten Carbonyl Derivatives DAD M(CO)3(*CO) (*C0 = 12 CO, 13 C0, C 18 0) Heindirk torn Dieck  
 Abstract    Diazadiene metal tetracarbonyls, DAD M(CO)4, (M = Cr, Mo, W; DAD = R-N = CH-CH = NR with aliphatic and aromatic substituents R) show equi-distribution of one labelled CO when synthesized from fac-DAD M(CO)3(CH3CN) as a consequence of intramolecular CO site exchange. The structures of two Mo-complexes (1: R = iso-propyl; 2: R = 2,6-diisopropylphenyl) with DAD's of different bulkiness have been solved by X-ray methods. From the infrared solution spectra, including those of isotopically labelled (13 CO, C 18 0) compounds, all of the force constants ki, k2, ktt, kcc and kct bave been calculated independently. The ratios of interaction force constants deviate sharply from Cotton-Kraihanzel assumptions, perhaps because of the substantial deviation of the iraws-pair of CO groups from linearity (1: 154.5°, 2: 147.9°). The solid state N-Mo, Mo-C and C-0 bond lengths are neither in agreement with the generally accepted picture for donor/acceptor influences nor with typical IR data and force constant interpretations. (2 with higher v(CO) and ki, k2 has the longer CO bonds and shorter Mo-C bonds than 1.) The force constant sets have been used to calculate CO frequencies for over 60 labelled compounds with good accuracy (Av < 2 cm -1). 
  Reference    Z. Naturforsch. 38b, 568—579 (1983); eingegangen am 3. Dezember 1982 
  Published    1983 
  Keywords    Diazadiene Chromium, Molybdenum and Tungsten Carbonyls, X-Ray, Isotopically Labelled Carbonyls 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0568.pdf 
 Identifier    ZNB-1983-38b-0568 
 Volume    38 
111Author    ErnstOtto Fischer, Jiabi Chen+Requires cookie*
 Title    Übergangsmetall-Carben-Komplexe, CXXX [1] Nucleophile Spaltung der Kohlenstoff-Fluor-Bindung in einem Fluorcarben-Komplex des Mangans Transition Metal Carbene Complexes, CXXX [1] Nucleophilic Cleavage of the Carbon-Fluorine Bond in a Fluorocarbene Complex of Manganese  
 Abstract    The reaction of C5H5(CO)2Mn[C(C6H5)F] with n-C4H9Li results in cleavage of the C(carbene)-F bond and formation of C5H5(CO)2Mn[C(C6H5)n-C4H9]. In a similar way fluoride can be abstracted by ethanol to yield C5H5(CO)2Mn[C(C6H5)OC2H5]. 
  Reference    Z. Naturforsch. 38b, 580—581 (1983); eingegangen am 27. Januar 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0580.pdf 
 Identifier    ZNB-1983-38b-0580 
 Volume    38 
112Author    ErnstOtto Fischer, Rudolf ReitmeierRequires cookie*
 Title    Übergangsmetall-Carben-Komplexe, CXXXI [1]  
 Abstract    Umsetzung von [(CO)5WCNEt2]BF4 mit anionischen Organylverbindungen von Elementen der V. Hauptgruppe Transition Metal Carbene Complexes, CXXXI [1] Reaction of [(CO)sWCNEt2]BF4 with Anionic Organyl Compounds of Group V Elements Transition Metal Carbene Complexes The cationic carbyne complex [(CO)5WCNEt2]BF4 (1) reacts with potassiumdiphenyl-amide, KNPI12, with nucleophilic addition of the amide anion to give (CO)5W[C(NEt2)NPh2] (2). The corresponding reactions with KPPh2, KPEt2, KPMePh, NaSbPh2 and NaBiPh2 yield the complex [(CO)5~W(CNEt2)]2 (3), which is formed by reductive dimerization of two carbyne fragments. In case of KPMePh the carbene complexes (CO)5\V[C(NEt2)PMePh (4) and £rans-(MePhPH)(CO)4W[C(NEt2)PMePh] (5) are also obtained. On warming in solution 1 1 
  Reference    Z. Naturforsch. 38b, 582—586 (1983); eingegangen am 4. Februar 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0582.pdf 
 Identifier    ZNB-1983-38b-0582 
 Volume    38 
113Author    Alexander Filippou, ErnstOtto FischerRequires cookie*
 Title    Übergangsmetall-Carbin-Komplexe, LXXIY [1]  
 Abstract    Synthese thermisch stabiler neutraler Carbin-Carbonyl-Komplexe von Chrom, Molybdän und Wolfram mit den zweizähnigen Liganden 2.2' -Bipyridyl und 1.10-Phenanthrolin Transition Metal Carbyne Complexes, LXXIV [1] Synthesis of Thermostable Neutral Carbyne Carbonyl Complexes of Chromium, Molybdenum, and Tungsten with the Bidentate Ligands 2,2'-Bipyridyl and 1,10-Phenanthroline trans -Bromo (organy lcarby ne) -(eis -dicarbony 1 (2,2' -bipyridyl) Metal Complexes, Chromium, Molybdenum, Tungsten 
  Reference    Z. Naturforsch. 38b, 587—591 (1983); eingegangen am 17. Januar 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0587.pdf 
 Identifier    ZNB-1983-38b-0587 
 Volume    38 
114Author    Borislav Bogdanović, Martin Rubach, Klaus SeevogelRequires cookie*
 Title    ?f-Allyl-hydrogensulfidopalladium-und -platin-Komplexe ?7 3 -Allylmetal-Sulfur Complexes, IV [1] ?y 3 -A]lyl-hydrogensulfidopalladium and -platinum Complexes  
  Reference    Z. Naturforsch. 38b, 592—598 (1983); eingegangen am 28. Dezember 1982 
  Published    1983 
  Keywords    r/ 3 -Allyl-hydrogerisulfklopalladium Complexes, r/ 3 -Allyl-hydrogensulfidoplatinum Complexes, IR Spectra, Raman Spectra, NMR Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0592.pdf 
 Identifier    ZNB-1983-38b-0592 
 Volume    38 
115Author    Borislav Bogdanović, Peter Göttsch, Martin RubachRequires cookie*
 Title    r/ 3 -Allylmetall-Schwefel-Komplexe, V [1] Mono-und bimetallische, mehrkernige ry 3 -Allylmetall-Sehwefel-Komplexe des Nickels, Palladiums und Platins r/ 3 -Allylmetal-Sulfur Complexes, V [1] Mono-and Bimetallic, Polynuclear rj 3 -Allylmetal-Sulfur Complexes of Nickel, Palladium and Platinum  
  Reference    Z. Naturforsch. 38b, 599—603 (1983); eingegangen am 28. Dezember 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0599.pdf 
 Identifier    ZNB-1983-38b-0599 
 Volume    38 
116Author    Reinhard Benn, Borislav Bogdanović, Peter Göttsch, Martin RubachRequires cookie*
 Title    Anionische ^ 3 -Allylnickel-und -palladium-Schwefel-CJuster ?; 3 -Allylmetal-Sulfur-Complexes, VI [1J Anionic r/ 3 -Allylnickel-and -palladium-Sulfur-Clusters  
  Reference    Z. Naturforsch. 38b, 604—610 (1983); eingegangen am 28. Dezember 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0604.pdf 
 Identifier    ZNB-1983-38b-0604 
 Volume    38 
117Author    Hans Bock, Sitki Aygen, Bahman SoloukiRequires cookie*
 Title    Gasphasen-Reaktionen, 35 [1] Benzseleniren als kurzlebiges Zwischenprodukt in der Pyrolyse von 1.2.3-Benzoselenodiazol zu 6-Fulvenselon Benzselenirene as Short-lived Intermediate in the Pyrolysis of 1,2,3-Benzoselenodiazole to 6-Fulvenselone  
 Abstract    In the pyrolysis of 1,2,3-benzoselenodiazole using a short-distance furnace, a short-lived intermediate is detected photoelectron spectroscopically. Mass spectra recorded under similar conditions suggest an isomer CöHiSe rearranging to the more stable final product 6-fulveneselone. The ionization pattern obtained by computerized spectra stripping is assigned to benzselenirene by molecular radical cation state comparison based on MNDO calculations. 
  Reference    Z. Naturforsch. 38b, 611—615 (1983); eingegangen am 24. Januar 1983 
  Published    1983 
  Keywords    PE Spectra, Short-lived Intermediates, Selenium Compounds 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0611.pdf 
 Identifier    ZNB-1983-38b-0611 
 Volume    38 
118Author    Reinhold Tacke, Haryanto Linoh, Burghard Stumpf, Wolf-Rainer Abraham, Klaus Kieslich, Ludger ErnstRequires cookie*
 Title    Mikrobiologische Umwandlung von Silicium-Yerbindungen: Enantioselektive Reduktion von Acetessigsäure-(trimethylsilylalkyl)estern und deren Carba-Analoga Microbiological Transformation of Silicon Compounds: Enantioselective Reduction of Trimethylsilylalkyl Acetoacetates and their Carba-Analogues  
 Abstract    The trimethylsilylalkyl acetoacetates 1 b and 2 b as well as their carba analogues 1 a and 2 a have been reduced microbiologically by Kloeckera corticis (ATCC 20109), leading to the corresponding (+)-3(£)-hydroxybutanoates 3b, 4b, 3a, and 4a. The enantiomeric purity was found to be 80% (3a, 3b, 4b) and 65% (4a), respectively. The reduction of lb and 2b is -to our knowledge -the first example for a controlled microbiological transformation of organosilicon substrates. 
  Reference    Z. Naturforsch. 38b, 616—620 (1983); eingegangen am 8. Dezember 1982 
  Published    1983 
  Keywords    Silicon Compounds, Microbiological Transformation, Enantioselective Reduction 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0616.pdf 
 Identifier    ZNB-1983-38b-0616 
 Volume    38 
119Author    Ulrich Bayer, HansAlbert BruneRequires cookie*
 Title    Untersuchungen über Substituenten-Einflüsse auf die reduktive Eliminierung des Biphenyl-Systems aus as-Bis(aryl)bis(triphenylphosphan)platin(II)-Verbindungen Influence of Substituents on the Reductive Elimination of the Biphenyl-System from cis-Bis(aryl)bis(triphenylphosphane)platinum(II) Compounds  
 Abstract    Compounds cis-[Pt(PPh3)2(3-X-C6H4)2] [X = F, Cl, CF3, CH30, (CH3)2N] and cis-[Pt(PPh3)2(3-X-C6H4)(Y-C6H4)] [X = F/Y = H, 4-F, 4-CF3, 4-CH30; X = Cl/Y = 4-F; X = CF3/Y = 4-F; X = CH3Ö/Y = 4-F] have been synthesized and studied thermally with respect to the reductive elimination of disubstituted biphenyls. Activation parameters A H+ and A S4= are reported and discussed. 
  Reference    Z. Naturforsch. 38b, 621—631 (1983); eingegangen am 17. Januar 1983 
  Published    1983 
  Keywords    Platinum-organic Compounds, Syntheses, Reductive Elimination, Activation Parameters 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0621.pdf 
 Identifier    ZNB-1983-38b-0621 
 Volume    38 
120Author    Ulrich Bayer, HansAlbert BruneRequires cookie*
 Title    Ein Beitrag zur Frage der Existenz von d~ p--Binduiigsanteilen zwischen Platin und sp 2 -hybridisierten Kohlenstoff-Atomen in Phenyl-Platin-Verbindungen A Contribution on the Existence of d^p.-r-Interactions between Platinum and sp 2 -hybridized Carbon in Phenyl-Platinum Compounds  
 Abstract    19 F NMR chemical shifts of 14 fluorine substituted cis-Bis(phenyl)bis(triphenylphos-phane)platinum(II) compounds are discussed with respect to d^p^-interactions between platinum and sp 2 -hybridized carbon. 
  Reference    Z. Naturforsch. 38b, 632—634 (1983); eingegangen am 17. Januar 1983 
  Published    1983 
  Keywords    Platinum-Phenyl Compounds, 19 F NMR Spectra, d^p^-Interactions 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0632.pdf 
 Identifier    ZNB-1983-38b-0632 
 Volume    38 
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