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1990 (280)
161Author    Requires cookie*
 Title    Zur Stereochemie von c/s-Pterocarpanen -eine theoretische Studie  
 Abstract    O n the Stereochem istry o f cw -Pterocarpans -a T heoretical Study W illy Friedrichsen* u n d Axel Schöning In stitu t für O rganische C hem ie d er U n iversität Kiel, O lshausenstraße 40/60, D -2300 Kiel, F R G Z. N atu rfo rsch . 45b, 10 4 9 -1 054(1990); eingegangen am 12. Ja n u a r 1990 cw -P terocarpans, Stereochem istry, C o n fo rm atio n al E quilibria, A M 1 C alculatio ns (A M 1) on cw -pterocarpans are reported. The results are in agreem ent w ith experim ental observations. 
  Reference    Z. Naturforsch. 45b, 1049 (1990) 
  Published    1990 
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 Identifier    ZNB-1990-45b-1049 
 Volume    45 
162Author    E.M A Fsah, M. H. Am, M. Ouda, M.M K HalifaRequires cookie*
 Title    A Study on the Mannich Reaction with 1,3-Indandione  
  Reference    Z. Naturforsch. 45b, 1055 (1990) 
  Published    1990 
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 Identifier    ZNB-1990-45b-1055 
 Volume    45 
163Author    Requires cookie*
 Title    Heterocyclische Siebenring-Verbindungen, XXXV [1] Die thermische 1-Benzothiepin-Thionaphthol-Umlagerung  
 Abstract    H eterocyclic Seven-M em bered Ring C om p o u n d s, X X X V [1] T he T herm al 1-B enzothiepine-Thionaphthole R earrangem ent H ans H ofm ann*, C hristine G ö ttfe rt und H elm ut G aube 
  Reference    Z. Naturforsch. 45b, 1059 (1990) 
  Published    1990 
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 Identifier    ZNB-1990-45b-1059 
 Volume    45 
164Author    R. Afat, M. Ilad, M. Ohareb, SherifM., Rad SherifRequires cookie*
 Title    cr-Bromoacetophenones in Heterocyclic Synthesis: A Convenient One-Pot Synthesis and the Chemical Behaviour of 3-Bromomethylbenzo|d]isoxazole  
  Reference    Z. Naturforsch. 45b, 1067 (1990) 
  Published    1990 
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 Identifier    ZNB-1990-45b-1067 
 Volume    45 
165Author    Requires cookie*
 Title    Synthesis and Photodecomposition of Two Azido Derivatives of PCB  
 Abstract    A ngelika B ründl, E rnst C lausen3, and K laus Buff* G esellschaft fü r S trahlen-und U m w eltforschung, A bteilung für Zellchem ie und a In stitu t fü r Ö kologische C hem ie, D-8042 N euherberg Z. N atu rfo rsch . 45b, 1 0 7 2 -1074(1990); received N ovem ber 16. 1989 P olychlorinated Biphenyls, P h o todecom position, A zido C o m p o u n d s Synthesis o f the PCB derivatives 4-azido-2,2',4',5,5'-pentachlorobiphenyl an d 4,4'-diazido-2,2',5,5'-tetrach lo ro b ip h en y l is described. The co m p o u n d s are easily p h o to a c tiv ate d by UV-C irrad iatio n . T h u s these derivatives are valuable p hotolabels which have been used already in studies o f in tracellu lar distrib u tio n . 
  Reference    Z. Naturforsch. 45b, 1072 (1990) 
  Published    1990 
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 Identifier    ZNB-1990-45b-1072 
 Volume    45 
166Author    Requires cookie*
 Title    Synthesis and Plane Selective Spin Trapping of a Novel Trap 5,5-Dimethyl-3-(2-ethoxycarbonylethyl)-1 -pyrroline N-oxide  
  Reference    Z. Naturforsch. 45b, 1075 (1990) 
  Published    1990 
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 Identifier    ZNB-1990-45b-1075 
 Volume    45 
167Author    Inosose Liquid, C. Rystals, K. Laus Praefcke, BerndK. Ohne, A. Ndreas, E. Ckert, Joachim HempelRequires cookie*
 Title    Inosose-Flüssigkristalle*  
  Reference    Z. Naturforsch. 45b, 1084 (1990) 
  Published    1990 
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 Identifier    ZNB-1990-45b-1084 
 Volume    45 
168Author    Requires cookie*
 Title    Regioselectivity Control of Thiocyanate Benzylation by the Structure of Phase Transfer Catalysts [1]  
 Abstract    E ckehard V. D ehm low * and G agik O. T o ro ssian [2] F a k u ltä t für C hem ie, U n iv ersität Bielefeld, U n iv ersitätsstraß e 25. D -4800 Bielefeld 1 Z. N atu rfo rsch . 45b, 1091 -1092 (1990); received F eb ru ary 12, 1990 A m bident SC N A nion, Benzyl T h iocyanate, Benzyl Isothiocyanate, C atalyst S tructure Influence Solid/liquid phase tran sfer catalytic conver­ sions o f K S C N an d benzyl ch loride at 180 °C give th io cy an ate/iso th io cy an ate ratio s depending on catalyst structure. L iq u id /liq u id P T C at 100 °C yields thiocyanate exclusively. 
  Reference    Z. Naturforsch. 45b, 1091 (1990) 
  Published    1990 
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 Identifier    ZNB-1990-45b-1091_n 
 Volume    45 
169Author    Z.Requires cookie*
 Title    Variety of Oxidation States of Manganese Ions in Compounds with Tripod-Like Tetradentate Ligands  
 Abstract    Y uzo N ishida*, M iyuki N asu, an d T adashi T okii+ D ep artm en t o f C hem istry, F acu lty o f Science, Y am ag ata U niversity, Y am ag ata 990, Ja p a n , an d + D ep artm en t o f C hem istry, F acu lty o f Science and Engineering, Saga U niversity, 
  Reference    Z. Naturforsch. 45b, 1093—1096 (1990); received Jan u ary 2 1990 
  Published    1990 
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 Identifier    ZNB-1990-45b-1093_n 
 Volume    45 
170Author    Bernd Jung, G. Erd, M. EyerRequires cookie*
 Title    Kristallstruktur  
 Abstract    von [As(C6H5)4J2[Re3ClH(H 20)] • H 20 C rystal Structure o f [As(C6H 5)4]2[R e3C lu (H 20) ] H 20 
  Reference    Z. Naturforsch. 45b, 1097 (1990) 
  Published    1990 
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 Identifier    ZNB-1990-45b-1097_n 
 Volume    45 
171Author    Requires cookie*
 Title    from Cadaba farinosa  
 Abstract    V iqar U ddin A hm ad*, A ziz-ur-R ehm an A m ber, K aniz Fizza, an d A rsh ad K am al H .E .J. R esearch In stitu te o f C hem istry, U niversity o f K arachi, K arachi-75270, P akistan Z. N aturfo rsch . 45b, 1100-1 102 (1990); received D ecem ber 11, 1989 Sesquiterpene L actone, Cadaba farinosa A new eudesm anolide has been isolated from Cadaba farinosa. Its stru ctu re was determ ined by spectroscopic studies including 2 D -N M R (/-resolv ed , COSY -45 an d h etero C O SY experi­ m ents). 
  Reference    Z. Naturforsch. 45b, 1100 (1990) 
  Published    1990 
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 Identifier    ZNB-1990-45b-1100_n 
 Volume    45 
172Author    Requires cookie*
 Title    Molekülstruktur von Re3Cl6(Acac)3 im Feststoff  
 Abstract    M olecular Structure o f R e3C l6(A cac)3 in the Solid State M an fred Irm ler und G erd M eyer* In stitu t für A norganische und Analytische Chemie, Justus-Liebig-U niversität, H einrich-Buff-Ring 58, D-6300 G ießen Z. N atu rfo rsch . 45b, 1 1 0 3 -1104 (1990); eingegangen am 22. Ja n u a r 1990 R henium , A cetylacetonate, C rystal S tructure D a rk red single crystals o f R e3C l6(A cac)3 are ob tain ed from a solution o f " R eC l3 -2 H 20 " in acetylacetone by slow ev ap oratio n . The u nit cell (m onoclinic, P2!/c, a -1687.3(9), b = 963.4(5), c = 1664.3(9) pm , ß = 108.97(4)°) contains fo u r m olecules o f R e3Cl6(A cac)3. E ach o f the b identate A cac(—) ligands substitutes one o f the in-plane term inal and one o f the out-of-plane term inal li­ gands w ith respect to the R e3 triangle. 
  Reference    Z. Naturforsch. 45b, 1103 (1990) 
  Published    1990 
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 Identifier    ZNB-1990-45b-1103_n 
 Volume    45 
173Author    Dirk Petersen, M. Artina Lemmrich, M. Atthias Altrogge, Jürgen VossRequires cookie*
 Title    Electroreduction o f Organic Com pounds, XV [1] Electrochemical Dehalogenation of Chlorinated Benzenes and Biphenyls in M ethanol  
 Abstract    The twelve possible chlorinated benzenes and the three isomeric m onochlorobiphenyls are elec-trochemically reduced in a divided cell in meth­ anol at a lead cathode. Chlorobenzene and ben­ zene or biphenyl, respectively, are formed with acceptable current yields and very good chemical yields. 
  Reference    Z. Naturforsch. 45b, 1105—1107 (1990); eingegangen am 11. Dezember 1989 
  Published    1990 
  Keywords    Electroreduction, Chlorinated Benzenes and Biphenyls, D ehalogenation 
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 Volume    45 
174Author    Ekkehard Lindner, Berthold KarleRequires cookie*
 Title    Fluktuierendes Verhalten von Tris(Ether-Phosphan)-Ruthenium(II)- Komplexen Novel Basic Ligands for the Hom ogenous Catalytic C arbonylation of M ethanol, XXVII [1] Fluxional Behaviour of Tris(ether-phosphane) Ruthenium (II) Complexes  
 Abstract    Three equivalents o f the ether-phosphane li­ gands 2 a -c react with Cl2R u(PPh3)3 (1) to give the complexes rra«.s-Cl2R u (P '''0)(P ~ 0) 2 (3a-c) 
  Reference    Z. Naturforsch. 45b, 1108—1110 (1990); eingegangen am 24. Januar 1990 
  Published    1990 
  Keywords    Ruthenium Complexes, Ether-phosphanes, Fluxional Behaviour 
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 Identifier    ZNB-1990-45b-1108_n 
 Volume    45 
175Author    Y.W M Irhom, A.G H Annab, M.H A Elgamalb, K. Szendrei, J. Reischd, R. EgyptRequires cookie*
 Title    A Novel Triterpenoid Isolated from the Roots of Glycyrrhiza echinata L  
 Abstract    Triterpene, 3 >5,21 a-D ihydroxy-oleane, 11,13-Dien-28-oic Acid 
  Reference    Z. Naturforsch. 45b, 1111—1112 (1990); received December 11 1989 
  Published    1990 
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 Identifier    ZNB-1990-45b-1111_n 
 Volume    45 
176Author    W. Preetz, M. StallbaumRequires cookie*
 Title    Darstellung und "B-NMR-Spektren perhalogenierter c/oso-Hexaborate B«X"Y6."2-, n = 0 -6 ; X * Y = Cl, Br, I  
 Abstract    The mixed halogenohexaborates B6X"Y6_"2~, n = 1 -5 ; X ^ Y = Cl, Br, I, including most o f the pure stereoisomers for n = 2 -4 , are prepared for the first time by treatment o f the halo-hydrohexaborates B6X"H6_"2~, X = Cl, Br in aqueous alkaline solution with bromine and iodine or with halogenosuccinimides. The point symmetry is determined from the "B N M R spectra, which show characteristic features for hom ologous isostructural compounds. In the systems B6X"Y6_n2_ a considerable dispersion o f the "B signals is observed, for B(X) atoms to lower, for B(Y) atoms to higher field compared with B6X 62_ and B6Y 62~ (electronegativity X > Y), respectively. An additional chemical shift is caused by the mutual antipodal effect between pairs o f opposite B atom s carrying different substituents. From the systematic influ­ ences on the chemical shifts the "B N M R spectra o f the missing species fac-B6X 3Y 32_ are cal­ culated. 
  Reference    Z. Naturforsch. 45b, 1113—1117 (1990); eingegangen am 6. März 1990 
  Published    1990 
  Keywords    Mixed Halogenohexaborates, 11B N M R Spectra, A ntipodal Effect 
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 Identifier    ZNB-1990-45b-1113 
 Volume    45 
177Author    R. J. Schubert, K.-J RangeRequires cookie*
 Title    T etra-w-butylammoniumdicyanoaurat(I), (/j-C4H9)4N Au(CN)2 Tetra-/7-butylammonium Dicyanoaurate(I), (az-C4H9)4N A u(C N)2  
 Abstract    Single crystals o f (/j-C4H9)4N A u (C N) 2 were obtained by crystallization using the tempera­ ture decreasing method in a newly developed com puter-controlled apparatus. The colourless crystals aor e monoclinic, space group A 2/n, with a = 20.216(2) Ä, b = 13.130(1) A, c = 9.328(1) A, and ß = 109.69(1)°. The measured density is 1.45 g/cm 3, which agrees with the cal­ culated density o f 1.40 g/cm 3 for Z = 4. The structure was solved by Direct M ethods using 674 independent reflections and refined by least-squares procedures to conventional and weighted R factors o f 0.068 and 0.058, respectively. The nearly linear [A u(C N)2]~-anions form pseudo-hexagonal layers, in which they are arranged parallel to each other. The shortest A u -A u dis­ tance is 8.05 A. The stacking o f the layers produces pseudo-trigonal channels, occupied by the cations. The tetra-«-butylammonium cation has four ordered trans chains with idealized D 2d symmetry (42 m). 
  Reference    Z. Naturforsch. 45b, 1118—1122 (1990); eingegangen am 12. Februar 1990 
  Published    1990 
  Keywords    Tetra-«-butylammonium Dicyanoaurate(I), Crystal Growth, Crystal Structure 
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 Identifier    ZNB-1990-45b-1118 
 Volume    45 
178Author    M. K. Das, S. C. HakrabortyRequires cookie*
 Title    Boron Spirochelates Derived from Some Hydroxamic Acids and Carboxylic Acids  
 Abstract    A number o f boron spirochelates o f the general formula B [R 'C 0 N (R)0 ]Y have been syn­ thesized by the single-pot reaction o f boric acid, a hydroxamic acid R'C O N (R)O H and a car­ boxylic acid H 2Y . The spirochelates have been characterized by elemental analyses, by IR, N M R ('H and nB) and UV spectra and conductance measurements. They are non-electro-lytes. 
  Reference    Z. Naturforsch. 45b, 1123—1127 (1990); received January 23 1990 
  Published    1990 
  Keywords    Boron, Hydroxam ic A cids, Carboxylic Acids, Spirochelates 
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 Identifier    ZNB-1990-45b-1123 
 Volume    45 
179Author    Ulrich Müller, My-Linh Ha-Eierdanz, G. Ertrud, K. Räuter, K. Urt DehnickeRequires cookie*
 Title    Synthese und Kristallstruktur von (PPh4)4[Cu2S e14| Synthesis and Crystal Structure of (PPh4)4[Cu2Se14]  
 Abstract    Polyselenide Complex o f Copper(I), Synthesis, IR Spectra, Crystal Structure (PPh4)4[Cu2S e14] has been prepared by the reaction o f a lithium polyselenide solution in D M F with CuCl at 120 °C in the presence o f PPh4Br. The compound forms black crystals, which were characterized by IR spectroscopy as well as by an X-ray structure determination. Space group P 2 ,, Z = 2, 2690 observed unique reflexions, R = 0.095. Lattice dim ensions at 19 °C: a = 2139.5(9), 6 = 1 6 1 1 .7 (3), c = 1365.1(3) pm, ß = 93.54(3)°. The com pound consists o f PPh4+ and [Cu2Se14]4" ions, in which the two copper atoms are bridged by an Se52-chain. One o f the Cu atom s is a member o f a CuSe4 ring, the other one o f a CuSe5 ring; the coordina­ tion at each Cu atom is trigonal-planar. 
  Reference    Z. Naturforsch. 45b, 1128—1132 (1990); eingegangen am 15. Januar 1990 
  Published    1990 
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 Identifier    ZNB-1990-45b-1128 
 Volume    45 
180Author    G.E N Arda, J. C. Pedregosa, S. B. Etcheverry, E. J. BaranRequires cookie*
 Title    Schwingungsspektroskopische Untersuchung einiger gemischter Calcium/Cadmium-Hydroxylapatite Vibrational-Spectroscopic Investigation on Some Mixed Calcium /Cadmium -Hydroxylapatites  
 Abstract    The infrared spectra o f a series o f cadmium substituted calcium hydroxylapatites o f the type C aH)_;cC dv(P 0 4)6(0 H)2, were investigated in order to obtain insight on the effect o f the Cd(II) ion on the vibrational properties o f the P 0 4_ and O H " groups. The effect o f the substitutional process on the strength o f the P -O bonds was also checked by Raman Spectroscopy and an analysis o f the behaviour o f the deuterated C a5C d5(P 0 4)6(0 D) 2 phase was undertaken. The strength o f the P -O bonds shows a linear dependence on the Cd(II) content, whereas the OH-vibrational modes present a more com plex behaviour. 
  Reference    Z. Naturforsch. 45b, 1133—1135 (1990); eingegangen am 15. Januar 1990 
  Published    1990 
  Keywords    Mixed Apatites, Calcium /Cadmium Apatites, Phosphate Vibrations, Hydroxyl Vibrations, Hard Tissues 
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 Identifier    ZNB-1990-45b-1133 
 Volume    45 
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