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1994 (283)
161Author    HenriB. Runner3, Manfred Muschiola, B. Ernhard, N. UberbRequires cookie*
 Title    Ein Dimer von Ferroceno[l,2]cyclohexen-l-on-3  
 Abstract    Dimerization of Ferroceno[l,2]cyclohexen-l-one-3, X-Ray A new by-product in the synthesis of ferroce-no[l,2]cyclohexen-l-one-3 (1) is the dimer 2, which has been characterized by an X-ray analy­ sis. Molecular structure of 2: Space group C 2h/ 
  Reference    Z. Naturforsch. 49b, 991—9 (1994); eingegangen am 28. Januar 1994 
  Published    1994 
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 Identifier    ZNB-1994-49b-0991_n 
 Volume    49 
162Author    W. S. Sheldrick, B. SchaafRequires cookie*
 Title    Schichtstruktur £, [Te6~] RbTe6, a Polytelluride with Layer Structure ^,[Te6_]  
 Abstract    Reaction of Rb2C 0 3 with Te in M ethanol at 160 °C in the presence of G e yields the polytellu­ ride RbTe6, the structure o f which has been deter­ mined by X-ray structural analysis. The poly­ anions (£,[Te6~] contain Te6 rings with a chair conformation, which are connected via four T e-T e bonds into a layer structure. A T structure is exhibited by the resulting TeTe3 units. The Rb cations adopt positions betw een neighbouring parallel anion layers and are surrounded by 12 Te atoms in their first coordination sphere. 
  Reference    Z. Naturforsch. 49b, 993—9 (1994) 
  Published    1994 
  Keywords    Rubidium Polytelluride, Methanolothermal Synthesis, Crystal Structure 
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 Identifier    ZNB-1994-49b-0993_n 
 Volume    49 
163Author    Blaschette, PeterG. Jones, Karin Linoh, Ilona Lange, M. Artina Näveke, Dagmar Henschel, Axel Chrapkowski, Dietm Ar, SchomburgRequires cookie*
 Title    Arm  
  Reference    Z. Naturforsch. 49b, 999—1011 (1994); eingegangen am 1. Februar 1994 
  Published    1994 
  Keywords    Polysulfonylamines, 18-Crown-6-Dimesylamine (3/2), Synthesis, Crystal Structure, Coronand Conformation 
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 Identifier    ZNB-1994-49b-0999 
 Volume    49 
164Author    H. Bocka, T. H. Auck3, C. N. Äthera, Z. HavlasbRequires cookie*
 Title    Wechselwirkungen in Kristallen, 35 [ 1, 2]  
 Abstract    Einkristallzüchtung von Na0 ^C(NO2)3 [***] aus Etherlösungen zu einem polymeren Band [(Na" 9 C (N 0 2)3) D io x a n ^ und einem Lösungsmittel-getrennten Ionenpaar [(Na0 /18-Krone-6)(THF)2]0 [(Na0 /18-K rone-6)(O N O -C e (NO 2)2)2]e Interactions in Crystals, 35 [1, 2] Single Crystal Growths of Na0 e C (N O 2)3 [***] from Ether Solutions to a Polymer Band [(Na0 e C (N O2)3)Dioxane]TO and to a Solvent-Separated Ion Pair [(Na0 /18-Crown-6)(THF)2]0 [(Na0 /18-C row n-6)(O N O -C e (N O 2)2)2]e The sodium salt of the most simple polynitro-substituted hydrocarbon anion, Na0 e C (N O 2)3, (for a hazard warning cf. [***]) crystallizes from ether solutions without and with addition of 18-crown-6 either in a polymer band, [(Na®0 C (N O 2)3)dioxane]oo, or as a solvent-separated ion pair, [(Na®/18-crown-6)(THF2]0 [(Na®/18-crown-6)(O2N -C e (N O 2)2)2]e . The Na® cations are each 8-fold coordinated in hexagonal bipyramidal arrangement. According to extensive quantum-chemical calculations based on the structure coordinates, the formation of these novel salts can be traced back to the charge distribution in the anions e C (N 0 2)3, which due to negatively charged oxygen centers are favorable complex ligands. The structure determining effects of solvation are discussed. 
  Reference    Z. Naturforsch. 49b, 1012—1020 (1994); eingegangen am 31. Januar 1994 
  Published    1994 
  Keywords    Trinitromethanide Salts, Single Crystal Structure, M N DO Calculations, Solvation Effects 
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 Identifier    ZNB-1994-49b-1012 
 Volume    49 
165Author    Hans Bocka, Sabine Nicka, ChristianN. Äthera, JanW. Bats3, Professor Franz-GustavRequires cookie*
 Title    Strukturen ladungsgestörter Moleküle, 47 [1 , 2 ] Dinatrium-und Dikalium-Nitranilate: Die Cyanin-Verzerrung der Kohlenstoff-Sechsringe Structures of Charge-Perturbed Molecules 47 [1,2] Disodium and Dipotassium Nitranilates: The Cyanine Distortion of the Six-Membered Carbon Ring  
 Abstract    Crystals of lemon yellow dipotassium nitranilate and of yellow disodium nitranilate di­ hydrate have been grown and their structures determined at 290 and 200 K. The six-member-ed, 0 2N-disubstituted rings show a pronounced cyanine distortion with all four CO bonds identical and the two (0 C C (N 0 2) C 0) e chains connected by single CC bonds of each 156 pm length. In the anhydrous K® salt, the ring is planar, but in the Na® hydrate salt it exhibits a twist conformation. Quantum chemical calculations allow to reproduce the structure in every detail, demonstrate strong charge alternation along the cyanine chains with considerable delocalization into the 0 2N acceptor substituents, and suggest that the rather long connecting CC bonds contain positively charged carbon centers on both ends. In addition, metal ion coordination effects as well as the rather high pKa value of nitranilic acid are rationalized. 
  Reference    Z. Naturforsch. 49b, 1021—1030 (1994); eingegangen am 17. März 1994 
  Published    1994 
  Keywords    Cyanine Distortion of C6-Rings, Single Crystal Structures, Semiempirical Calculations 
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 Identifier    ZNB-1994-49b-1021 
 Volume    49 
166Author    Joachim Pickardt, B. Ritta KühnRequires cookie*
 Title    Kristallstrukturen der [2  
 Abstract    2.2]Cryptate [Cd(cryptand 222)][CdCl4] und [Hg(cryptand 222)][Hg2Cl6] mit achtfach koordinierten Metallionen Crystal Structures of the [2.2.2]Cryptates [Cd(cryptand 222)][CdCl4] and [Hg(cryptand 222)][Hg2Cl6] with 8-Coordinated Metal Ions 
  Reference    Z. Naturforsch. 49b, 1031—1035 (1994); eingegangen am 29. April 1994 
  Published    1994 
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 Identifier    ZNB-1994-49b-1031 
 Volume    49 
167Author    R. Obert Schröck, Alexander Sladek, H. Ubert SchmidbaurRequires cookie*
 Title    ,2-Di(silyl)benzene and l,4-Dibromo-2,5-di(silyl)benzene  
 Abstract    Silanes, Silylbenzenes, Di(silyl)benzenes. Bromo(silyl)benzenes 1,2-Di(silyl)benzene (3). has been prepared in a three-step process starting with the reac­ tion of 1 ,2-dibromobenzene and /?-tolyl(chloro)silane with magnesium in tetrahydrofuran, which affords l,2-bis(p-tolylsilyl)benzene (1) as a stable high-yield intermediate. Compound 1 has been converted into 1 .2-bis(trifluoromethanesulfonatosilyl)benzene (2) with trifluoro-methanesulfonic acid, and finally into 3 by reduction with lithiumaluminiumhydride, both again in high yields. -In an attem pt to prepare l,2,4.5-tetra(silyl)benzene in an analogous way. only the bis-silylated species could be obtained (from l,2,4,5-C6H 2Br4, p-M eC6H4SiClH2 and Mg powder: l,4-dibromo-2,5-bis(p-tolylsilyl)benzene, 4, and l,4-dibromo-2,5-di( 
  Reference    Z. Naturforsch. 49b, 1036—1040 (1994); received May 20 1994 
  Published    1994 
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 Identifier    ZNB-1994-49b-1036 
 Volume    49 
168Author    HorstW. Eber, Andreas Grzesiok3, Reiner Sustmannb, H. Ans-, Gert Korthb, Herrn Prof, H J Dr, RothRequires cookie*
 Title    Stabile und instabile Produkte bei der Reaktion von 2.2-Diphenyl-l,2-dihydrochinolinnitroxid-Radikalen mit Stickstoffmonoxid Stable and Unstable Products on the Reaction of 2.2-Diphenyl-l,2-dihydroquinolinenitroxide Radicals with Nitric Oxide  
 Abstract    The stable 2,2-diphenyl-l,2-dihydroquinolinenitroxide radicals 1 react with nitric oxide (NO) to form the stable nitro compounds 2 and 3 as main products. The stable dinitro compounds 6 and 1,2-dihydroquinolines 7 are formed in minor yield as side-products accom­ panied with the unstable N-nitroso compounds 4 and 5, which further decompose to form the stable products mentioned above. The proposed mechanism of the reaction is discussed in terms of homolytical processes and is supported by PM 3 calculations. 
  Reference    Z. Naturforsch. 49b, 1041—1050 (1994); eingegangen am 15. März 1994 
  Published    1994 
  Keywords    Nitroxide Radicals, Nitric Oxide, PM3 Calculations, Homolysis 
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 Identifier    ZNB-1994-49b-1041 
 Volume    49 
169Author    Armin Weiss, Stefan DickRequires cookie*
 Title    Der zweikernige Fe(III)-Komplex von N,N,N',N'-Tetrakis(2-pyridylmethyl)-2-hydroxy-l,3-diaminopropan - Molekül-und Kristallstruktur und seine Wechselwirkung mit Montmorillonit The Binuclear Fe(III) Complex of N,N,N',N'-Tetrakis(2-pyridylmethyl)-2-hydroxy-l,3-diaminopropane - Molecular and Crystal Structure and its Interaction with Montmorillonite  
 Abstract    of [Fe2(H P T P)(0 H)(N 0 3)2](C104)2 (HPTP = N,N,N',N'-tetrakis(2-pyridyl-methyl)-2-hydroxy-l,3-diaminopropane) were grown by slow diffusion of diethylether into a solution of the complex salt in acetonitrile. Crystal data: space group R3, a = 4280,1(15) pm, c -1147,6(7) pm, Z = 18. The complex exhibits a binuclear Fe(III) core with (w-oxo)(//-alkoxo) ligands as bridging units. The nitrate anions coordinate each with a short and a long F e -O bond. The coordination spheres of the iron atoms can be looked at as distorted edge-shearing pentagonal bipyramides. The complex cation was introduced into the interlayer region of montmorillonite by cation exchange in acetonitrile. The results of X-ray, IR-and UV/VIS experiments suggest that the cation exchange is reversible. In the interlayer region the dinuclear cations are arranged in a rather loosely packed way, thus creating channels similar to those in pillared smectites or zeolites, respectively. 
  Reference    Z. Naturforsch. 49b, 1051—1058 (1994); eingegangen am 17. Januar 1994 
  Published    1994 
  Keywords    Binuclear Iron(III) Complex, Hem erythrin Model, Crystal Structure, Montmorillonite, Cation Exchange Reaction Yellow crystals 
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 Identifier    ZNB-1994-49b-1051 
 Volume    49 
170Author    İzzetA. Mour, Saim Ozkar, CorneliusG. KreiterRequires cookie*
 Title    Synthesis and Spectroscopic Studies of Pentacarbonylfumaronitrile-chromium(O), -molybdenum(O), and -tungsten(O)  
 Abstract    Photolysis of hexacarbonyl-chromium(O), -molybdenum(O), and -tungsten(O) in presence of fumaronitrile yields at room tem perature pentacarbonyl-fumaronitrile-chromium(O) (1), -molybdenum(O) (2), and -tungsten(O) (3). The complexes were purified by crystallization and characterized by IR and 13C-NM R spectroscopy. The fumaronitrile ligand is bonded to the M (CO)5 moiety by one nitrile nitrogen atom rather than by the carbon-carbon double bond. In toluene 2 dissociates into fumaronitrile and pentacarbonyl-molybdenum(O), which is stabi­ lized by the solvent. Fumaronitrile and solvated pentacarbonyl-molybdenum(O) exist in solu­ tion together with 2 in an equilibrium which lies in favour of the former species. 
  Reference    Z. Naturforsch. 49b, 1059—1062 (1994); eingegangen am 13. April 1994 
  Published    1994 
  Keywords    Chromium, Molybdenum, Tungsten, Carbonyl, Fumaronitrile Complexes 
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 Identifier    ZNB-1994-49b-1059 
 Volume    49 
171Author    FrankW. Heinem, Helmut Hartung, NadjaM. Aier3, HermannM. Atschiner3Requires cookie*
 Title    Molekül-und Kristallstruktur der Verbindung 8-(n-Butylamino- phenyl-methyliden)  
 Abstract    -l,2,3?4,5,6,7-heptathiocan Molecular and Crystal Structure of 8-(«-Butylamino-phenyl-methylidene)-l,2,3,4,5,6,7-heptathiocane By the reaction of acetophenone with sulfur and primary amines yellow-coloured crystals of the title compound are formed. It crystallizes in the monoclinic space group P 2 x!n with lattice constants a = 1309.9(2) pm, b = 926.5(2) pm, c -1582.2(2) pm and ß -114.00(1)°. The structure of the eight-membered heptathiocane ring is characterized by a crown confor­ mation. The range of the S -S distances [204.4(1)-207.3(1) pm], the S -S -S bond angles [107.2(1) — 109.0(1)°] and the S-S-S-S torsion angles [93.2(1)-97.7(1)°] is comparable to those observed in a-, ß-and y-sulfur. 
  Reference    Z. Naturforsch. 49b, 1063—1066 (1994); eingegangen am 3. Februar 1994 
  Published    1994 
  Keywords    Heptathiocane, Acetophenone, Sulfur, Crystal Structure, Crown Conformation 
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 Identifier    ZNB-1994-49b-1063 
 Volume    49 
172Author    E. Riedel, D. Prick, E. Wolska, Herrn Prof, Dr, Dieter Heinz, LutzRequires cookie*
 Title    Mößbauer-Untersuchung ferrimagnetischer Spinelle des Systems CdA -Ni1_jrFe20 4 M ößbauer Investigation of Ferrimagnetic Spineis in the System Cd*Ni1_JC Fe20 4  
 Abstract    Cadmium-Nickel-Iron Spinels, M ößbauer Spectra, Magnetic Properties Room tem perature Mößbauer spectra of ferrimagnetic spinels in the system Cd2+F e^^[N i7t J.Fei+A r]0 4 have been interpreted using the polyhedron model which is based on six different environments at the A-site for the B-site Fe3+-ions. To each environm ent belongs one sextet with a characteristic magnetic splitting. An additional sextet is due to Fe3+-ions at the A-site. 
  Reference    Z. Naturforsch. 49b, 1067—1070 (1994); eingegangen am 18. März 1994 
  Published    1994 
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 Identifier    ZNB-1994-49b-1067 
 Volume    49 
173Author    Viktor Keimes, Albrecht MewisRequires cookie*
 Title    MgNi2P -das erste ternäre Phosphid mit geordneter Fe3C-Struktur MgNi2P -The First Ternary Phosphide with an O rdered Fe3C Type Structure  
 Abstract    MgNi2P was prepared by heating a mixture of the elements and investigated by means of single crystal X-ray methods. The compound crystallizes in an ordered Fe3C-type structure 
  Reference    Z. Naturforsch. 49b, 1071—1073 (1994); eingegangen am 00. 00. 0000 
  Published    1994 
  Keywords    Ternary Nickelphosphide, Magnesium, Crystal Structure 
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 Identifier    ZNB-1994-49b-1071 
 Volume    49 
174Author    JörgH. Albering, Wolfgang JeitschkoRequires cookie*
 Title    D im orp h ie T h N i2P 2 with B aC u2S2 and C aB e2G e2 Type Structure  
 Abstract    Two modifications of ThNi2P2 were prepared in a tin flux at 850 °C (a-ThN i2P2) and 1000 °C (/3-ThNi2P2). The crystal structures of both modifications were refined from single­ crystal X-ray data. a-ThN i2P2 (BaCu2S2 type structure): Pnma, a = 819.69(5). b = 394.28(3), c = 981.54(7) pm. R = 0.028 for 32 variables and 654 structure factors; /3-ThNi2P2 (CaB e2Ge2 type structure): P4/nmm, a = 408.5(1), c = 908.0(3) pm, R = 0.033 for 15 variable param eters and 261 F values. Although the two structures are closely related, they can be transformed into each other only by a reconstructive phase transformation. The differences and similari­ ties of the two structures are discussed. The high tem perature form has higher symmetry, a smaller num ber of variable positional parameters, and a tendency for higher coordination numbers. 
  Reference    Z. Naturforsch. 49b, 1074—1080 (1994) 
  Published    1994 
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 Identifier    ZNB-1994-49b-1074 
 Volume    49 
175Author    Rainer Pöttgen, G. Ünter Block, Wolfgang Jeitschko, RonaldK. BehrensRequires cookie*
 Title    Preparation and Crystal Structure of the Carbides Ln12Re5C15 (Ln = Y, L a-N d, G d-E r)  
 Abstract    The title compounds were prepared by arc-melting of the elem ental components and sub­ sequent annealing. Their crystal structure is hexagonal P 6 2 m with one formula unit per cell. It was determined from single-crystal X-ray data o f La12R e5C i5 (a = 1116.8(1) pm. c = 545.3(1) pm. R = 0.060 for 287 structure factors and 27 variable parameters) and H o 12R e5C i5 (a = 1066.7(1) pm, c -504.2(1) pm, R = 0.018 for 392 F's and 31 variables). The structures correspond to the formula Ln12[ReC 3]2[R e3C3(C2)3], where the brackets indicate two differ­ ent trigonal planar anionic rhenium-carbon groups. The coordination of the rhenium atoms in these polyanions seem s to be compatible with the 18-electron rule. 
  Reference    Z. Naturforsch. 49b, 1081—1088 (1994); received February 22 1994 
  Published    1994 
  Keywords    Crystal Structure, Lanthanoid-Rhenium-Carbides, 18-Electron Rule 
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 Identifier    ZNB-1994-49b-1081 
 Volume    49 
176Author    A. Rnd Böttcher, Horst Elias, Brigitte Eisenmann, Elke Hilms, Andreas Huber, Rüdiger Kniep, CarolineR. Öhr, M. Argareta Zehnder, M. Arkus Neuburger, Johan SpringborgRequires cookie*
 Title    A Novel Synthetic Approach to Asymmetric Salen, Dihydrosalen, and Tetrahydrosalen Ligands: Structures and 0 2-Activating Properties of their Nickel(II) and Cobalt(II) Complexes A. Böttcher et al. * A N ovel Synthetic Approach to Asymmetric Ligands  
 Abstract    Activation of D ioxygen, Asymmetric Salen, Dihydrosalen, Tetrahydrosalen, Crystal Structure A synthetic procedure is described for the preparation of the tetradentate N 20 2 ligands H2[H4]L! = 6-(2-hydroxyphenyl)-2,5-diaza-3,3-dimethyl-l-(2-hydroxy-3-r-butyl-5-methyl-phenyl)heptane, H 2[H2]L' = 6-(2-hydroxyphenyl)-2,5-diaza-3,3-dimethyl-l-(2-hydroxy-3-/-bu-tyl-5-m ethylphenyl)-l-heptene, and H 2L' = 6-(2-hydroxyphenyl)-2,5-diaza-3,3-dimethyl-l-(2-hydroxy-3-r-butyl-5-methylphenyl)-l,5-heptadiene, which are asymmetric derivatives o f the ligands tetrahydrosalen, dihydrosalen, and salen. Complexes N i[H 4] L \ N i[H 2]L', N iL 1, C oL 1, N i[H 4]L2 (([H 4]L2)2~ = anion of H2[H4]L2 = N,N'-bis(2-hydroxy-3-/-butyl-5-methylbenzyl)-fra«s-(S,S)-l,2-diam inocyclohexane), and NiL2 were prepared, characterized (VIS and IR ab­ sorption, magnetic m om ent) and subjected to spectrophotometric titration with pyridine, to determine the equilibrium constants for adduct formation. Single crystal X-ray structure analy­ ses were carried out for N i[H 7]L ' (monoclinic, P 2jln\ a = 8.926(4), b = 29.324(7), c = 8.411(4) A; ß = 95.3(1)°; Z = 4), C oL 1 (m onoclinic, C2/c; a = 25.389(2), b = 18.139(2), c = 10.179(1) A; ß = 112.227(6); Z = 8), and N i[H 4]L2-acetone (tetragonal, P4i2i2; a = 13.928(3), c = 33.698(5) Ä; Z = 8). In all of the three complexes, the N 20 2-metal coordination core is square-planar. The skeleton of the tetradentate ligand is more or less twisted. The planar cobalt(II) com plex C oL 1 is a low spin d7 system with /uexp = 2.02 BM at 298 K, whereas the planar com plexes N iL 1, N i[H 2] L \ and N i[H 4]L2 are diamagnetic (j i e x P = 0.2 8 -0 .6 4 BM). The blue solvate N i[H 4]L1-3 E t0 H H 20 is paramagnetic (jucxp = 3.04 BM), which points to octahedral coordination. In aerated acetone solution, the tetrahydrosalen-type complex Ni[H4]L ! activates dioxygen and one C -N bond is oxidatively dehydrogenated. The VIS spectrum of the dihydrosalen-type com plex formed is virtually identical with that of the aldimine complex N i[H 2]lA In the pres­ ence of dioxygen, C o[H 4]L' and CofH^jL1 are readily oxidized to C oL 1 in acetone solution. # Abbreviations: salen, H 2salen = N,N'-disalicylidene-1,2-diaminoethane; tetrahydrosalen, H2[H4]salen = N,N'-bis(2-hydroxybenzyl)-l,2-diam inoethane; dihydrosalen, H2[H2]salen = N-(2-hydroxybenzyl)-N'-salicylidene-l,2-diam inoethane; H 2(B u,X 5)[H 4]salen, N,N'-bis(2-hydroxy-3-r-butyl-5-X-benzyl)-l,2-diaminoethane; H 2[H2]L !, 6-(2-hydroxyphenyl)-2,5-diaza-3,3-dimethyl-l-(2-hydroxy-3-r-butyl-5-methyl-phenyl)-l-heptene-6; H 2[H4]L ', 6-(2-hydroxyphenyl)-2,5-diaza-3,3-dimethyl-l-(2-hydroxy-3-r-butyl-5-methylphenyl)heptane; H 2L ', 6-(2-hydroxyphenyl)-2,5-diaza-3,3-dimethyl-1 -(2-hydroxy-3-/-butyl-5-m ethylphenyl)-l,5-heptadiene; H2[H4]L2, N,N'-bis(2-hydroxy-3-?-butyl-5-methylbenzyl)-rran5,-(S,S)-1,2-diaminoeyclohexane; H 2L2, N,N'-bis(3-r-butyl-5-methylsalicylidene)-rran5-(S,S)-l,2-diaminocyclo-hexane. 
  Reference    Z. Naturforsch. 49b, 1089—1100 (1994); received January 27 1994 
  Published    1994 
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 Identifier    ZNB-1994-49b-1089 
 Volume    49 
177Author    Joseph Grobe, Harald ZiemRequires cookie*
 Title    Bildung und Reaktivität der Silaethene Me(Vi)Si=CHCH2'Bu und Vi2Si=CHCH2'Bu  
 Abstract    The reactions of Vi2(Me)SiCl or Vi3SiCl with 'BuLi in pentane solution at low temperatures (-7 8 to 20 °C) are governed by the addition of 'BuLi to one of the vinyl groups, followed by LiCl elimination to yield the silaethenes V i(M e)Si=C H N p (1) and Vi2Si=CHNp (2), re­ spectively. The following reactions of 1 and 2 without or with trapping reagents have been studied in some detail. Both silaethenes undergo dimerization with formation of 1,3-disila-cyclobutane derivatives, in case of 2 accompanied by trimers. A surprise is the generation of the disilanes V i(M e)Si(C H =C H 'Bu)Si(M e)V i(C H 2CH2,Bu) (3) and Vi2Si(CH=CH'Bu)SiVi2(CH2CH2'Bu) (17) very probably by intermolecular ene-type reac­ tions. With DMB or isoprene as trapping agents [4 + 2]-cycloadducts 11, 14, 15, 21, ene-pro-ducts 10, 13 and substitution products 12, 22 are obtained. A very efficient indirect detection of 1 and 2 has been achieved with M e3SiOMe as quenching reagent, which gives excellent yields of the adducts V i(M e)Si(O M e)C H (SiM e3)Np (16, 91%) and Vi2Si(O M e)C H (SiM e3)Np (23, 76%). respectively. Problems in the characterization of iso­ mer mixtures arise from difficulties in the GC separation procedure and from the limited thermal stabilities of some of the products. 1 and 2 are very similar with respect to the reactivity of the Si=C double bond, but differ considerably in their tendency to undergo polymerization which is connected to the number of vinyl groups. Therefore, the yields of the typical Si=C products is drastically reduced in the case of 2. In spite of separation pro­ blems most of the products have been characterized by a combination of GC/MS, GC/FT-IR and NM R measurements. 
  Reference    Z. Naturforsch. 49b, 1101—1114 (1994); eingegangen am 14. Februar 1994 
  Published    1994 
  Keywords    Silaethenes, Neopentyl, Cycloaddition Reactions with Dienes, Disilane Formation 
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 Identifier    ZNB-1994-49b-1101 
 Volume    49 
178Author    W. Lübbe, A. Franken, W. PreetzRequires cookie*
 Title    Darstellung, n B-, 13C-, 'H-NMR-und Schwingungsspektren  
 Abstract    von 1.2-Trimethylenpentahydro-closo-Hexaborat(l -) , c i s -[B6H5(CH2)3]" und 1.2-TetramethyIenpentahydro-closo-Hexaborat(l-), cjs-[B6H5(CH2)4]_ sowie Kristallstrukturen von [P(C6H5)4][B6H5(CH2)3] und [P(C6H5)4][B6H5(CH2)4] Preparation, n B, 13C, 'H NMR and Vibrational Spectra of 1.2-Trim ethylenepentahydro-closo-hexaborate(l-), ds-[B 6H 5(C H 2)3]_, and 1.2-Tetram ethylenepentahydro-closo-hexaborate(l-), ds-[B 6H 5(CH 2)4]~, and the Crystal Structures of [P(C6H 5)4][B6H 5(CH 2)3] and [P(C6H 5)4][B6H 5(C H 2)4] 1.2-Trimethylenepentahydro-closo-hexaborate(l -) , 1.2-Tetram ethylenepentahydro-closo-hexaborate( 
  Reference    Z. Naturforsch. 49b, 1115—1122 (1994); eingegangen am 17. Januar 1994 
  Published    1994 
  Keywords    ), Crystal Structures, 'H NM R Spectra, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1115.pdf 
 Identifier    ZNB-1994-49b-1115 
 Volume    49 
179Author    Kerstin Müllera, Klaus-JürgenR. Ange3, AntonM. HeynsbRequires cookie*
 Title    Alkalimetallformiate, VI Die Kristallstruktur von Rubidiumhydrogendiformiat, RbH(HC02)2 [1]  
 Abstract    Single crystals of the title compound have been obtained by neutralization of formic acid with solid rubidium carbonate and subsequent solvent evaporation at room temperature. The very hygroscopic crystals are orthorhombic, space group Pbca (Nr. 61), with a = 7.614(1), 
  Reference    Z. Naturforsch. 49b, 1123—1126 (1994); eingegangen am 11. April 1994 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1123.pdf 
 Identifier    ZNB-1994-49b-1123 
 Volume    49 
180Author    Vassilios Vergopoulosa, Sven Jantzen3, Nathalie Julien3, Eric Roseb, D. Ieter, R. Ehder3Requires cookie*
 Title    Oxo-und Non-oxovanadium(IY)-Komplexe mit Oxy-Carboxylaten als Liganden, und die Struktur von VCl2(salen) Oxo and Non-oxovanadium(IV) Complexes with Oxy-Carboxylate Ligands, and the Structure of VCl2(salen)  
 Abstract    Oxovanadium Compounds, N on-O xo Complexes of Vanadium V 0 2+ forms complexes of composition V O (L J)(E tO H), V O (H L 1)2 and V 0 (H L 2)(H 20) with the lithium or sodium salts of 6-hydroxymethyl-pyridine-2-carboxylic acid (H 2L ') and 4,8-dihydroxyquinoline-2-carboxylic acid (H 3L2). V Cl2(salen/salphen) and V Cl2(napgly/ nappa) (napgly and nappa are the Schiff bases derived from o-hydroxynaphthaldehyde and glycine or phenylalanine, respectively), prepared from the oxo precursor and SOCl2, react with Li2L ' and the lithium salts of benzilic acid (H 2L3) and ortho-hydroxybenzoic acid (H 2L4) to yield the non-oxo ("bare") com plexes V (sa le n)L \ V (salen)L 3, V (salphen)L 3, V (salen)L 4, V (napgly)L', V(nappa)L! and V(nappa)L4. The com plexes have been characterized by IR, EPR and elemental analyses. VOCl2(salen) crystallizes in the monoclinic space group Cc, a = 14.579(3), b = 9.537(2), c = 13.453(3) Ä, ß -120.92(3)°. The m olecule exhibits gross distor­ tions from octahedral geometry. An improved synthesis for H 2L' is described. 
  Reference    Z. Naturforsch. 49b, 1127—1136 (1994); eingegangen am 21. Januar 1994 
  Published    1994 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1127.pdf 
 Identifier    ZNB-1994-49b-1127 
 Volume    49 
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