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1989 (280)
101Author    K. Hesse, G. Gliemann, A. Kiss, P. Kleinschmit, W. VölkerRequires cookie*
 Title    Photophysics of Ceramic Luminophores. Zeolite-Based Luminophores of the Types Zn2S i04:Mn and (C d0)2B20 3:Mn  
 Abstract    The em ission spectra (at T = 10 K and 296 K) and the excitation spectra (at T = 295 K) o f zeolite-based luminophores of the types Z n:S i 0 4:Mn and (C d O)2B2O vM n show the characteris­ tics of M n2+ in tetrahedral and octahedral surroundings, respectively, as well as additional fea­ tures due to impurities and/or structural defects of the host crystal. The Z n S i0 4-type phosphor exhibits photostim ulated em ission, which can be assigned to trap states o f the silicate host. 
  Reference    Z. Naturforsch. 44b, 557 (1989); received January 24 1989 
  Published    1989 
  Keywords    Ceramic Lum inophores, Z eolites, Photophysics 
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 Identifier    ZNB-1989-44b-0557 
 Volume    44 
102Author    G. Erhard, BaumArnd Greiling, W. Erner Massa, BenjaminC. Hui, Jörg LorberthRequires cookie*
 Title    Metallorganische Verbindungen für MOCVD-Prozesse: Kristallstruktur des dinieren Addukts [Et3AsXAsCI3]2 Crystal Structure of the Dimeric Triethvlarsine-Arsenictrichloride A dduct, Dimer [Et3A sx A sC 13]2: Synthesis, Molecular and Crystal Structure  
 Abstract    Triethylarsine-Arsenictrichloride Adduct. Synthesis. Crystal Structure Reaction of E t,A s with A sC l, in n-pentane yields dimeric [E t,A sX AsC13]2 in quantitative yield; sublimation in vacuo affords white crystals. X -R ay diffraction data were collected at 133 K (3149 independent observed reflections; R = 0.029. Rw = 0.026). Crystal data: m onoclinic space group P2,/c, a = 761.9(8). b = 1118.8(4). c = 1406.0(14) pm; ß = 100.90(4)°. Z = 2 dimers. The dimer contains a planar A s2Cl6-unit with terminal and bridging A s —Cl bonds; each arsenic atom is bonded to a Et3A s m olecule via an arsenic—arsenic bond. The dimer thus has pseudo four-and six-coordinate arsenic atoms. 
  Reference    Z. Naturforsch. 44b, 560 (1989); eingegangen am 17. Novem ber 1988/23. Januar 1989 
  Published    1989 
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 Identifier    ZNB-1989-44b-0560 
 Volume    44 
103Author    U. Holzgrabe, B. Piening, K.-F Hesse, H.-DH M Öltje, WorchRequires cookie*
 Title    Stereochemistry of 2,6-Dipyridine Substituted N-Benzyl-4-piperidone Mono-and Dicarboxylates and of the Corresponding Reduction Products [1]-Dipyridine Substituted N -Benzyl-4-piperidones M ono-and Dicarboxylates, K eto-Enol Tautom erism , Configurational Isom erism  
  Reference    Z. Naturforsch. 44b, 565 (1989); received N ovem ber 3 1988 
  Published    1989 
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 Identifier    ZNB-1989-44b-0565 
 Volume    44 
104Author    Giuliano Bandoli, Berto Casellato, Mario Gleria, Antonio Grassi, EnzoM. Ontoneria, GiuseppeC. PappalardoRequires cookie*
 Title    Solid State Structure of 2,2,4,4,6,6-Hexa(/?-naphthyloxo)cyclophosphazatriene and Dipole Moments of Hexa(aryloxo)cyclophosphazatrienes  
 Abstract    H exa(aryloxo)cyclophosphazatrienes, X -R ay. Solid State Structure, D ipole Moment The crystal and molecular structure of [N P (O C |0H 7)2]3 was determ ined by X-ray analysis. The dipole m om ents of this com pound and o f the hexa(phenoxo)cvclotriphosphazatrienes of formula [NP(O C6H 3X X 'Y),], (X = X ' = H . Y = p-Br; X = m -C H ,. X r = H . Y = p-C 1; X = X' = m -C H " Y = p-Cl; X = X' = m -C H ,. Y = H; X = X' = H. Y = p -C H (C H 3)2; X = X' = H. Y = p-C (C H 3)3) were measured in benzene at 25 °C. Crystals of [N P (O C 10H 7)2]3 are m onoclinic with unit cell dimensions a = 24.870(15), b = 7.712(8), c = 27.687(14) Ä , ß = 115.85(7)°; space group P 2 1/c. The structure was refined to an agreem ent factor of 0.09. The phosphazene ring deviates (max. deviation 17°) from planaritv. and mean distances (Ä) and angles (°) are P —N 1.58(1). P —O 1.58(1). O -C 1.41(2); P -N -P 120(1), N -P -N 119(1), P -O -C 124(2). The conform ations of the naphthyloxo groups at P(2) and P(3) are similar, and different from the group at P (l). D ipole moment analysis showed that the solid state conformation changes in the solution state. The measured value was in agreem ent with a symm etric conformation in which at the O —P —O plane each naphthyloxo group is rotated by ca. 4 0 —50° from the <7nr/-coplanar arrangement relative to this plane. The dipole m om ent data for the p-substituted phenoxo derivatives agree with such a conform ation, but the analysis of the dipole m oment values of phosphazenes having phenoxo groups bearing more than one substituent group and p-C H (C H 3)2 substituent failed to do so due to the inherent lim itations o f the m ethod. 
  Reference    Z. Naturforsch. 44b, 575 (1989); received Septem ber 23 1988 
  Published    1989 
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 Identifier    ZNB-1989-44b-0575 
 Volume    44 
105Author    George Sosnovsky, Klaus PurgstallerRequires cookie*
 Title    Aminations with O-Diphenylphosphinylhydroxylamine A Critical Evaluation  
 Abstract    Synthesis. O -D iphenylphosphinylhydroxylam ine, H ydroxylam ine-O -sulfonic A cid, N -A m ino Derivatives, N -A m in o H eterocyclic Com pounds A critical evaluation is presented o f the scope o f amination reactions with O-diphenylphos-phinylhydroxylamine (O D P H) as com pared to those using hydroxylamine-O-sulfonic acid (H O S A). Am inations with O D P H o f isopropyl, r-butyl and cyclohexyl carbanions derived from the corresponding Grignard reagents, gave the corresponding amines in 36, 34 and 50 percent yields, respectively. The am ination with H O S A o f the same carbanions under similar conditions was unsuccessful. The aminative quarternization o f the tertiary nitrogen of pyridine andquinoline with O D PH proceeded with com parable yields to those obtained with H O S A . A n improved one flask amination with O D P H o f indole, skatole and carbazole was achieved in 5 2 —62 percent yields. The am ination under the same conditions using H O S A gave consistently lower yields. Several other amination reactions which have been reported for H O SA were unsuccessful using O D P H . The conclusion is reached that overall the O D P H reagent is much less versatile than H O SA . N evertheless, in the am inations o f N H groups of heterocyclic com pounds ODPH appears to be superior to H O S A and is the reagent o f choice, in particular, since the preparation of O D PH is much less harzardous than that o f H O S A . 
  Reference    Z. Naturforsch. 44b, 582—586 (1989); received Septem ber 23. 1988 
  Published    1989 
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 Identifier    ZNB-1989-44b-0582 
 Volume    44 
106Author    RolfW. Saalfrank, W. Eißa, UweW. Irtha, Karl Petersb, HansG. Eorg, Von SchneringbRequires cookie*
 Title    2.2-Diethoxy-l-ethendiazonium-hexachIoroantimonat: Ein vielseitiger Synthesebaustein für 5-und 6-gliedrige N-Heterocyclen Kristall-und Molekülstruktur von 5'-Phenyl-3'-(2-phenyl  
 Abstract    6H-l,3,4-oxadiazin-5-yl)spiro[isobenzofuran-l(3H),2'(3'H)-[l,3?4]-oxadiazol]-3-on [1] 2.2-D iethoxy-l-ethenediazonium H exachloroantim onate: A Versatile Building Block for the Synthesis of 5-and 6 -Membered N-Heterocycles Crystal and M olecular Structure of 5'-Phenyl-3'-(2-phenyl-6H -l,3,4-oxadiazine-5-yl)spiro[isobenzofuran-l(3H),2'(3' H)-[l,3,4]-oxadiazol]-3-one [1] 2.2-D iethoxy-l-ethenediazon iu m Salts, 1 -A lk y l-1 H -1.2,3-triazoles, 2'-[2-Phenyl-4H -l ,3,4-oxadiazine-5(6H)-ylidene]benzohydrazide, 5'-P henyl-3'-(2-phenyl-6H -l ,3,4-oxadiazin e-5-yl)-l,3,4-oxad iazole-2(3H)-one, 2-Benzoyl-2,8-dihydro-6-phenyl[ 1,2,3,5]thiatriazolo[5.4-d][ 1,3.4]oxadiazine-3-oxide 
  Reference    Z. Naturforsch. 44b, 587 (1989); eingegangen am 16. D ezem ber 1988 
  Published    1989 
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 Identifier    ZNB-1989-44b-0587 
 Volume    44 
107Author    Rüdiger Blume, DagmarHeinrich Wiechoczek, FrankW. Meier, EdekindRequires cookie*
 Title    Degradation of Lactic Acid and Pyruvic Acid in Belousov-Zhabotinskii Reactions  
 Abstract    B elousov-Zhabotinskii R eaction. Lactid Acid. Pyruvic A cid. Brom o Pyruvic Acid The temporal degradation o f the Belousov-Zhabotinskii substrates lactic acid, pyruvic acid, bromo-and dibrom o pyruvic acid is investigated. The only final product o f non-brom inated substrates is acetic acid. From brominated educts only brominated acetic acids result. The con­ centrations o f the stable products are determined as a function o f time. The gross reactions are mainly based on simple consecutive first order reactions. For the pyruvic acid rate constants are determ ined. 
  Reference    Z. Naturforsch. 44b, 598 (1989); received January 23. 1989 
  Published    1989 
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 Identifier    ZNB-1989-44b-0598 
 Volume    44 
108Author    W. S. Sheldrick, J. KieferRequires cookie*
 Title    Crystal Structure of [Et4N][PBr4]. Structural Correlation for H alogenophosphates(III)  
 Abstract    Tetrabrom ophosphate(III). Crystal Structure. Structural Correlation 
  Reference    Z. Naturforsch. 44b, 609—611 (1989); eingegangen am 30. Januar 1989 
  Published    1989 
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 Identifier    ZNB-1989-44b-0609_n 
 Volume    44 
109Author    Udo Engelhardt, Ursula DiefenbachRequires cookie*
 Title    Cy clotriphosphazen-2-spiro-3' -cy clo- di[phosphadiazan] — Eine Spiroverbindung aus Hexachlor- triphosphazen und Dihydrazidothio- phosphorsäure-O-phenylester Cyclotriphosphazene-2-spiro-3'-cyclo- difphosphadiazane] — A Spiro Com pound from Hexachlorocyclotriphosphazene and Di- hydrazidothiophosphoric Acid O-Phenylester6-T etrachloro-6'-phenoxy-6'-thioxo-cyclotri- phosphazene-2-spiro-3'-cyclodi[phosphadiazane]. Spiro-Phosphazenes, Phosphorus-Hydrazine H eterocycles, 3IP NM R Spectra  
  Reference    Z. Naturforsch. 44b, 612 (1989); eingegangen am 18. Januar 1989 4.4.6. 
  Published    1989 
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 Identifier    ZNB-1989-44b-0612_n 
 Volume    44 
110Author    Evamarie Hey, S.Bruce Wild, SimonG. Bott, JerryL. AtwoodRequires cookie*
 Title    The Synthesis and Crystal Structure o f (/?*,/?*)-( ± ) -[ ( i/5-C5H 5){ 1,2- C6H4(PM ePh)2}Fe(PCI3)]Cl -2M eC N  
 Abstract    (^;'-Cyclopentadienyl)[l ,2-phenylenebis(m ethyI-phenylphosphine)](phosphorus trichloride)iron(II) Chloride Di-acetonitrile Solvate, Synthesis, Crystal Structure 
  Reference    Z. Naturforsch. 44b, 615 (1989); received January 9. 1989 
  Published    1989 
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 Identifier    ZNB-1989-44b-0615_n 
 Volume    44 
111Author    P. E. Rlhöfer, W. PreetzRequires cookie*
 Title    Darstellung und Schwingungsspektren der 35CI/37Cl-markierten Fluoro-Chloro-Platinate(IV) Preparation and Vibrational Spectra of 35C1/ Cl Labelled Fluoro-Chloro-Platinates(IV)  
 Abstract    A ll com ponents of the two series Cs2[PtF"35Cl6_"] and Cs2[PtF"37ClA_"], including the pairs of geom etric isomers for n = 2 ,3 , 4, have been prepared and isolated by ion exchange chrom atogra­ phy on D E A E cellulose. The highly resolved low temperature (80 K) IR and Raman spectra of the pure isotopom ers show distinctive isotopic shifts for different vibrational m odes up to 10 cm -1 . The excellent agreem ent o f the observed values with Teller-R edlich calculations verifies the assignm ent of all stretching and especially o f the narrow deform ation bands. For trans -com plexes containing C l—P t— Cl axes, the lowered of mutual exclusion. 
  Reference    Z. Naturforsch. 44b, 619 (1989); eingegangen am 8. Februar 1989 
  Published    1989 
  Keywords    Fluoro-C hloro-Platinates(IV ), Isotopom ers, Teller-Redlich Calculation, IR Spectra, Raman Spectra 
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 Identifier    ZNB-1989-44b-0619 
 Volume    44 
112Author    M. Arianne Baudler, Guido Scholz, Wolfgang OehlertRequires cookie*
 Title    Beiträge zur Chemie des Phosphors  
 Abstract    , 196 [1] Synthese und Eigenschaften der Organyltris(phosphino)silane RSi(PH2)3 (R = Me, Et, i-Pr, Ph) C ontributions to the Chemistry of Phosphorus, 196 [1] Synthesis and Properties of the Organotris(phosphino)silanes R Si(PH 2) 3 (R = M e, E t, i-Pr, Ph) O rganotris(phosphino)silanes, Organochlorophosphinosilanes, Organotrichlorosilanes, Lithium Tetraphosphinoalum inate The new organotris(phosphino)silanes R Si(PH 2)3 (R = Me (1), Et (2), /-Pr (3). Ph (4)) have 
  Reference    Z. Naturforsch. 44b, 627—631 (1989); eingegangen am 31. Januar 1989 
  Published    1989 
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 Identifier    ZNB-1989-44b-0627 
 Volume    44 
113Author    P. Eter Stolz, Wolfgang Saak, H. Enry, Strasdeit, Siegfried PohlRequires cookie*
 Title    Mangan(II)  
 Abstract    Komplexe mit dem vierzähnigen Stickstoffliganden Ci2H22N6(L): Synthese von [MnX2L] (X = CI, Br, I, NCS), Kristallstrukturen von [MnCl2L] und [MnBr2L] M anganese(II) Complexes with the T etradentate Nitrogen Ligand C 12H 22N(s(L): Synthesis of [MnX2L] (X = Cl, Br, I. NCS), Crystal Structures of [MnCl2L] and [M nBr:L] M anganese(II) C om plexes, Tetradentate Nitrogen Ligand. Synthesis, Crystal Structure [M nCl2(C 12H 22Nf,)] (1) and [M nBr2(C |2H 22N 6)] (2) are obtained from the reaction of M nX 2 (X = 
  Reference    Z. Naturforsch. 44b, 632 (1989); eingegangen am 2. Februar 1989 
  Published    1989 
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 Identifier    ZNB-1989-44b-0632 
 Volume    44 
114Author    Karl-Friedrich Tebbe, N. Orbert KraußRequires cookie*
 Title    Untersuchungen an Polypseudohalogeniden, VI [1] Darstellung und Kristallstruktur des Natriumdicyanoiodat(I)-dihydrats, Na[I(CN)2] * 2 H20 Studies on the Polypseudohalides, VI [1] Preparation and Crystal Structure of N a[I(CN )2] -2 H 20  
 Abstract    The new com pound N a[I(C N)2] • 2 H 20 can be prepared by addition o f iodine to a concentrated aqueous solution of sodium cyanide. It crystallizes in the monoclinic space group P 2,/c with a — 1044.0(2), b — 480.2(2), c = 730.2(2) pm , ß — 95.94(2)° and Z = 2. The crystal structure has been refined to Rf = 0.027 for 692 reflections. The structure may be described as a layer-like package o f cations N a+, water m olecules and trihalide-analogous anions [I(C N)2]~. The anion is strictly linear at the I atom and nearly linear at the C atom s with cp(l—C —N) = 176.2° and d(I —C) = 231.1, d (C —N) = 110.6 pm. The cation is surrounded by a slightly distorted octahedron o f nitrogen and oxygen atoms with d(N a--N) = 263.8, d(N a--O) = 242.0, 242.8 pm. 
  Reference    Z. Naturforsch. 44b, 637 (1989); eingegangen am 27. Januar 1989 
  Published    1989 
  Keywords    Sodium dicyanoiodate, C yanogen Com pound, Polypseudohalide, Pseudotrihalide, Crystal Structure 
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 Identifier    ZNB-1989-44b-0637 
 Volume    44 
115Author    Hidenari Inoue, Takeshi Kuroiwa, Tsuneo Shirai, Ekkehard FluckRequires cookie*
 Title    Preparation and Spectroscopic Characterization of rra/i5-Fe(CO)3L1L2 (L1, L2 = Phosphine or Phosphite)  
 Abstract    (Phosphine/Phosphite)tricarbonyliron, M ößbauer Spectra. IR Spectra, 3IP NM R Spectra The 57Fe M ößbauer spectra o f mixed ligand com plexes o f the type frfl«5-Fe(CO)3L'L: (L 1 = triphenylphosphine or triphenylphosphite and L2 = phosphine or phosphite) show a quadrupole-splitting doublet typical o f the disubstituted iron carbonyls in trigonal bipyramidal symmetry. The inverse linear dependence o f the isomer shifts on the CO stretching frequencies is interpreted on the basis o f the strengthening triple-bond nature o f the carbonyl ligands with increasing iron-to-phosphorus jr-back donation. A linear correlation, with a positive slope, betw een the isomer shifts and the quadrupole splittings has revealed that the phosphorus-to-iron a-donation is offset by the iron-to-phosphorus jr-back donation. A correlation betw een the coordination shifts and the isomer shifts dem onstrates that the iron-to-phosphorus jr-back donation plays an important role in the Fe —P bond. The relatively large coupling constant o f 2y (P ,P) reflects a strong interaction between fra«5-phosphorus ligands through the P —Fe —P bond. 
  Reference    Z. Naturforsch. 44b, 641 (1989); eingegangen am 7. N ovem ber 1988/27. Januar 1989 
  Published    1989 
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 Identifier    ZNB-1989-44b-0641 
 Volume    44 
116Author    Georg Beuter, Joachim SträhleRequires cookie*
 Title    Clusteraufbau durch Photolyse von R3PAuN3  
 Abstract    , III [1] Synthese von [(Ph3PAu)5Fe(CO)3]PF6 und Ru3(CO)10(jM-AuPPh3)(/i-NCO) Cluster Synthesis by Photolysis of R3PA uN 3, III [1] Synthesis of [(Ph3PA u)5Fe(C O)3]PF6 and R u3(C O)10(«-A uPPh3)(w-NCO) Photolysis of a mixture of Ph3P A u N 3 with F e(C O)5, Fe2(C O)9 or Fe3(C O),2 in TH F yields [(Ph3P A u)5F e(C O)3]+ (1) which crystallizes with PF6" as counterion as air stable, yellow platelets in the space group P2,/c: a = 2230.0(7), b = 1655.0(6), c = 2462.7(8) pm, ß = 94.04(5)°, Z = 4. The cationic A u5Fe cluster forms a bicapped F eA u 3 tetrahedron with almost equal Fe — A u dis­ tances o f 259.0 to 265.1 pm to all five A u atoms. D ue to the local symmetry C3|, o f the F e(C O)3 group two v(CO) at 1880 and 1930 c m ' 1 are observed. C o-photolysis of R u3(C O),2 and Ph3P A uN 3 does not result in a cleavage of the R u3 cluster. Bridging ,w-AuPPh3 and /^-NCO groups substitute two CO ligands to form Ru3(C O)10 («-A uPP h3)(u-N C O) (2). 
  Reference    Z. Naturforsch. 44b, 647 (1989); eingegangen am 26. Januar 1989 
  Published    1989 
  Keywords    Pentagold Iron Cluster, Synthesis, Crystal Structure, Triruthenium M onogold Cluster 
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 Volume    44 
117Author    A. Lexander, Constantin Filippou, W. Alter GrünleitnerRequires cookie*
 Title    Isonitril-substituierte Halbsandwich-Komplexe von Wolfram(IV) Isonitrile Substituted H alf Sandwich Complexes of Wolfram(IV)  
 Abstract    cis-and rra/t5-Iodo(^5-cyclopentadienyl)(rm -butylisonitrile)(dicarbonyl)tungsten(II). Triiodo(?75-cyclopentadienyl)(te/-f-butylisonitrile)(carbonyl)tungsten(IV), Diiodo(>75-cyclopentadienyl)(di-jm -butylisonitrile)(carbonyl)tungsten(IV) Iodide, Diiodo(?7s-cyclopentadienyl)(tri-rm -butylisonitrile)tungsten(IV) Iodide, D iiodo(cyano)(?7s-cyclopentadienyl)(di-rm -butylisonitrile)tungsten(IV) A good entry to cyclopentadienyl substituted isonitrile com plexes o f W (IV) is provided by 
  Reference    Z. Naturforsch. 44b, 666 (1989); eingegangen am 13. März 1989 
  Published    1989 
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 Identifier    ZNB-1989-44b-0666 
 Volume    44 
118Author    Rolf Minkwitz, A. Ndreas LiedtkeRequires cookie*
 Title    Bildung und NMR-spektroskopische Charakterisierung der Fluorphosphoniumkationen PH4_W F"+ (n = 1—4) Formation and NM R Spectroscopic Characterization of the Fluorophosphonium Cations, PH 4 _"F"+ (n = 1—4)  
 Abstract    The preparations o f the salts PH 3F +SbF6~ and PH F3+Sb2F n " are reported. All fluorophos­ phonium cations PH 4_"F"+ are characterized by multinuclear ('FI, 19F, MP) NM R spectroscopy. For n > 1 these salts are easily accessible by fluoride abstraction from fluorohvdridophos-phates(V). P H ,F +SbF6 , how ever, is obtained in the 
  Reference    Z. Naturforsch. 44b, 679—682 (1989); eingegangen am 15. August 1988 
  Published    1989 
  Keywords    Fluorophosphonium Salts, Form ation, N M R Spectra 
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 Identifier    ZNB-1989-44b-0679 
 Volume    44 
119Author    M. Oham, Hilmy Elnagdi, Abdel Fatma, Abdel Maksoud, Ebtisam Aal, Aziz Abdel, YoussefM. Flafez, Ahfouz YassinRequires cookie*
 Title    Studies on Alkyl Heterocyclic Aromatic Compounds: New Routes for the Synthesis of Polyazanaphthalenes  
 Abstract    Ethyl 2-A rylhydrazono-3-oxobutanoate, Alkylpyridazines, Alkylpyridines, Cinnoline D erivatives Several new polyfunctionally substituted polyazanaphthalene derivatives could be synthesized via condensing readily obtainable polyfunctional nitriles with substituted alkyl heteroarom atic derivatives and reacting the latter derivatives with electrophilic reagents. 
  Reference    Z. Naturforsch. 44b, 683 (1989); received Decem ber 5 1988 
  Published    1989 
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 Identifier    ZNB-1989-44b-0683 
 Volume    44 
120Author    Roland Vogt, Reinhard SchmutzlerRequires cookie*
 Title    Uber die Darstellung von P-Chlor-substituierten N,N'-Dimethylharnstoff-verbrückten Diphosphorverbindungen, deren Enthalogenierung mit Oxalsäurebis(trimethylsilylester) und anschließende Oxidation mit Tetrachlororthobenzochinon Preparation of P-Chloro-Substituted N .N '-D im ethylurea-Bridged D iphosphorus Compounds, their D ehalogenation with Oxalic Acid Bis(trimethylsilyl) Ester and Subsequent Oxidation with Tetrachloro-o-benzoquinone  
 Abstract    N .N '-D im ethyl-N ,N '-bis(trim ethylsilyl)urea. N ,N '-D im ethyl-N ,N '-bisalkyl(chlorophosphino)urea, N ,N '-D im ethyl-N ,N '-bis(diphenylphosphino)urea, Oxalic Acid Bis(trim ethylsilyl) Ester, M ixed V alence Diphosphorus Com pounds R eaction o f N ,N '-dim ethyl-N ,N '-bis(trim ethylsilyl)urea (1) with dichlorophosphines. RPC1; (R = Et: 14; R = Pr': 15) has furnished the P-chloro-substituted acyclic diphosphorus com ­ pounds, 16 and 17. In the analogous reaction o f 1 with Ph:PCl the corresponding bis(diphenyl-phosphino)-substituted derivative, 21 was formed. D ehalogenation o f 11, 16 and 17 with oxalic acid bis(trimethylsilyl) ester, 22 has produced the m ixed-valent cyclic A3P,A4P-diphosphorus com ­ pounds, 23—25 in almost quantitative yield. O xidation o f the A3P atom in 23—25 with tetrachloro-orthobenzoquinone. 26 has given rise to partial cleavage of the P —P bond, and only m oderate yields o f the products, 29, 31 and 32, have been obtained. The characterization o f the various com pounds obtained rests, especially, on their 'H and 3IP NM R spectra, and on a study o f their mass spectral fragmentation pattern. 
  Reference    Z. Naturforsch. 44b, 690 (1989); eingegangen am 5. D ezem ber 1988 
  Published    1989 
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 Identifier    ZNB-1989-44b-0690 
 Volume    44 
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