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1985 (316)
81Author    Brigitte Eisenmann, Jendy Hansa, Herbert SchäferRequires cookie*
 Title    Zur Kenntnis der Selenidosilikate und -germanate Na 4 Si 4 Se 10 , Na 2 GeSe 3 und Na 8 Ge 4 Se 10 On the Selenidosilicates and Germanates Na 4 Si 4 Se 10 , Na 2 GeSe 3 and Na 8 Ge 4 Se 10  
 Abstract    Selenidosilicates(IV), Selenidogermanates(IV) and (III), Crystal Structure The following new compounds have been prepared and structurally characterized: Na 4 Si 4 Se 10 : orthorhombic, space group Cmcm (No. 63). a -1340.9(5) pm, b = 1318.4(5) pm, c = 1086.5(4) pm, Z = 4, g x = 3.44 g/cm 3 , g exp = 3.47 g/cm 3 . The compound crystallizes in the Na 4 Si 4 S 10 type with adamantane analogous Si 4 Se 10 4-anions. Na 2 GeSe 3 : Monoclinic, space group P2,/c (No. 14). a = 709.7(2) pm, b = 1606.8(5) pm, c = 607.3(2) pm, ß = 113.69(8)°, Z = 4, g x = 3.72 g/cm 3 , g exp . = 3.76 g/cm 3 . The compound is isotypic with Na 2 GeS 3 . GeSe 4 -tetrahedra are connected by common corners to infinite "Zweiereinfach" chains. Na 8 Ge 4 Se 10 : monoclinic, space group P2,/c (No. 14). a = 1310.4(5) pm, b = 1205.7(5) pm, c = 1410.1(5) pm, ß = 92.9(1)°, Z = 4, g x = 3.77 g/cm 3 , £ exp . -3.75 g/cm 3 . Analogous to Na 8 Ge 4 Te 10 (mod. I), two octahedral Ge 2 Se 6 — units are connected by a common edge to a Ge 4 Se 10 8-— anion. 
  Reference    Z. Naturforsch. 40b, 450—457 (1985); eingegangen am 13. Dezember 1984/4. Februar 1985 
  Published    1985 
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 Identifier    ZNB-1985-40b-0450 
 Volume    40 
82Author    Walter Siebert, Mohyi El-Din, M. El-Essawi, Roland Full, Jürgen HeckRequires cookie*
 Title    Sandwich-Komplexe mit einem 2,5-Dihydro-l,2,5-thiadiborol-Derivat als Liganden [1]  
 Abstract    Cyclopentadienyl(2,5-dihydro-l,2,5-thiadiborol)cobalt, Cyclopentadienyl(2,5-dihydro-l,2,5-thiadiborol)nickel. ESR Spectra 
  Reference    Z. Naturforsch. 40b, 458—461 (1985); eingegangen am 21. Dezember 1984 
  Published    1985 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0458.pdf 
 Identifier    ZNB-1985-40b-0458 
 Volume    40 
83Author    Gert Heller, Joachim PickardtRequires cookie*
 Title    Über ein Ikosaborat-Ion in hydratisierten Kalium-und Natriumkupferpolyboraten On an Icosaborate Ion in Hydrated Potassium and Sodium Copper Polyborates  
 Abstract    K s H{Cu 4 O[B, 0 O 32 (OH) 8 ]}-33 H.O, M = 1925.46 g/mol, triclinic, PI, a = 1627.4(7), b = 1799.6(9), and c = 1365.2(5) pm; a = 96.37(5), ß = 110.93(5), and y = 111.36(5)°; Z = 2; D m = 1.96 (flotation) and D x = 1.91. Mg-m~ 3 ; R = 0.155 for 5022 observed reflections, and Na 5 H{Cu 4 O[B 20 O 32 (OH) 8 ]}. 32 H 2 0, M = 1825.62 g/mol, tetragonal, 14, a = 1866 and c = 1042 pm; Z — 2; D m = 1.63 and D x = 1.67 Mg-nT 3 have been investigated. The structure of the anion icosaboro-,«4-oxo-tetracuprate(II)(6—) contains the largest known isolated borate ion with 20 boron atoms. Each borate ion is a prophyrine-like ring, and encloses four Cu ions in a nearly planar Cu 4 0 cation, thus forming a chelate-like complex. While the anion structure is clear, the positions of the alkalimetal ions and the water molecules are not yet known, although an exact analysis and thermoanalytic determinations confirm the formula. 
  Reference    Z. Naturforsch. 40b, 462—466 (1985); eingegangen am 29. Oktober 1984 
  Published    1985 
  Keywords    Icosaborates, Heteropolyanions Polyborates, Structure 
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 Identifier    ZNB-1985-40b-0462 
 Volume    40 
84Author    Joseph Grobe, Due Le VanRequires cookie*
 Title    Reactive E=C (p-p)jr-Systems III [1]: Diels Alder Reactions with F 3 CP=CF 2 as Dienophile  
 Abstract    The perfluorophosphaalkene F 3 CP=CF 2 (1) reacts as a dienophile at temperatures between —20 and +15 °C with cyclopentadiene, 1,3-cyclohexadiene, butadiene and 2,3-dimethyl-butadiene, respectively, giving the corresponding Diels-Alder adducts 2 to 5 in high yields. The observed reactivity proves the close relationship of P=C and C=C systems. CF2 >F^ CF 2 
  Reference    Z. Naturforsch. 40b, 467—469 (1985); eingegangen am 27. November 1984 
  Published    1985 
  Keywords    Perfluorophosphaalkene, Diels-Alder Reactions, Mass Spectra, NMR Spectra 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0467.pdf 
 Identifier    ZNB-1985-40b-0467 
 Volume    40 
85Author    J. K. Das, K. C. DashRequires cookie*
 Title    Azido(imidazole)bis(acetylacetonato)cobalt(III) Complexes — Facile tränst eis Interconversion in Solution  
 Abstract    A number of mixed-ligand complexes of cobalt(III) containing coordinated azide ion, acetyl-acetonate anion and the neutral base imidazole and, having the general formula [Co(acac) 2 (N 3)(Im)] (Im = imidazole or its derivatives) have been synthesised by the reaction of K[rrans-Co(acac) 2 (N 3) 2 ] with the biologically active ligand imidazole or its derivatives. IR and electronic spectra alongwith 'H and 13 C NMR spectra have been employed to characterise the complexes and determine their geometry. In contrast to the stable f/w7s-[Co(acac) 2 (N0 2)(Im)] complexes, these azido complexes are shown to undergo facile trans^eis interconversion in CHC1 3 solution. The NMR spectra ('H and 13 C) can be interpreted by assuming the presence of an equilibrium mixture of the eis-and /rarts-isomers in solution. 
  Reference    Z. Naturforsch. 40b, 470—476 (1985); received August 27 1984 
  Published    1985 
  Keywords    Azido Coordination, Imidazole Adducts, Structural Interconversion 
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 Identifier    ZNB-1985-40b-0470 
 Volume    40 
86Author    Norbert Kleiner, Martin DrägerRequires cookie*
 Title    Über gemischte Bindungen in der IV. Hauptgruppe, II [1] Hexacyclohexylethan-Analoga Pb 2 (c-Hex) 6 , (c-Hex) 3 Pb—Sn(c-Hex) 3 und Sn 2 (c-Hex) 6 On Mixed Group IVb -Group IVb Bonds, II [1]  
 Abstract    Hexacyclohexylethane Analogues Pb 2 (c-Hex) 6 , (c-Hex) 3 Pb—Sn(c-Hex) 3 , and Sn 2 (c-Hex) 6 Lead, Tin, Metal-Metal Bond (c-Hex) 3 Pb—Sn(c-Hex) 3 is synthesized from (c-Hex) 3 PbLi and (c-Hex) 3 SnCl at —50 °C in THF. The three title compounds are isomorphous. The compounds have been investigated by mass, NMR and vibrational spectra. Pb,(c-Hex) 6 : highest fragment Pb 2 (c-Hex) 5 + , 7(13 C-207 Pb) 30.2 Hz, 2 /(13 C— 207 Pb) 9.1 Hz, d(207 Pb) +81 ppm. (c-Hex) 3 Pb-Sn(c-Hex) 3 : highest fragment PbSn(c-Hex) 5 + , <3(207 Pb) -92 ppm, c5(119 Sn) -157 ppm, 7(207 Pb-ll9 Sn) 2217 Hz. Sn 2 (oHex) 6 : parent peak Sn 2 (c-Hex) 6 +, 7(13 C-119 Sn) 113.3 Hz, 7(13 C-119 Sn) 26.4 Hz, <5(U9 Sn) -71 ppm, 7(119 Sn-119 Sn) 1258 Hz, v(Sn-Sn) 135 cm -1 . The crystal structure of Pb 2 (c-Hex) 6 has been deter-mined and refined to R = 0.044. The symmetry of the molecule is C 3 ; distances Pb—Pb 287.6(4), Pb—C 226(2) and 228(3) pm. The cyclohexyl groups are unusual flat and distorted from the normal C s symmetry; this is in accordance with two sets of 13 C NMR signals in benzene-d 6 . 
  Reference    Z. Naturforsch. 40b, 477—483 (1985); eingegangen am 12. November 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0477 
 Volume    40 
87Author    A. Döhring, P. W. Jolly, C. Krüger, M. J. RomãoRequires cookie*
 Title    The Ni(0)—C0 2 System: Structure and Reactions of [Ni(PCy 3 ) 2 (i/ 2 -C0 2 )]  
 Abstract    The reactions of a variety of bis(tricyclohexylphosphine)nickel species with C0 2 have been studied. The product of the reaction is solvent dependent: in toluene the known complex [NiL 2 (/7 : -C0 2)]-toluene (L = PCy 3) is formed while in ether or pentane a binuclear complex [(NiL 2) 2 (?;-C0 2)] results through the intermediacy of the solvent free species [NiL 2 (// 2 -C0 2)] the structure of which has been determined by X-ray crystallography. 
  Reference    Z. Naturforsch. 40b, 484—488 (1985); received November 30 1984 
  Published    1985 
  Keywords    Carbon Dioxide Complexes, Nickel, X-Ray 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0484.pdf 
 Identifier    ZNB-1985-40b-0484 
 Volume    40 
88Author    Helmut Endres, August Bongart, Dietrich Nöthe, Ingolf Hennig, Dieter Schweitzer, Herbert Schäfer, HansW. Helberg, Serge FlandroisRequires cookie*
 Title    A Novel Molecular Metal: (Oxamide oximato) (Oxamide oxime)nickel(II) Tetracyanoquinodimethanide, [Ni(oaoH)(oaoH 2 )]tcnq, and Physical Properties of its Semiconducting Pt Analogue  
 Abstract    [QHnNsNiOJ^CnH^]", M r = 498.09 is triclinic, PI, a = 3.7718(6), b = 7.436(2), c = 17.511(4) A, a = 88.67(2), ß = 86.93(2), y = 85.05(2)°, V = 488.51 Ä\ Z = 1, d c = 1.69 gern 3 , final R w = 0.035 for 1454 observed independent reflections. The crystals consist of segregated regular parallel stacks of planar metal complex cations and tenq" counterions with intermolecular H bonds stabilizing the structure. The compound is metallic at room temperature. A metal to semiconductor transition around 230 K shows up in thermopower data, in the microwave conduc-tivity and epr around 170 K. It is not visible in the static magnetic susceptibility. 
  Reference    Z. Naturforsch. 40b, 489—495 (1985); eingegangen am 15. November 1984 
  Published    1985 
  Keywords    Molecular Metal, Radical Salt, Electronic Properties, Stacked Structure 
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 Identifier    ZNB-1985-40b-0489 
 Volume    40 
89Author    W. UrlandRequires cookie*
 Title    Neue Verbindungen der Lanthanoiden vom Typ [(C 6 H 5 ) 4 E]MX 4 * 8 H 2 0 (E = P  
 Abstract    New Lanthanide Compounds of the Type [(C 6 H 5) 4 E]MX 4 • 8 H 2 0 (E = P, As The compounds [(C 6 H 5) 4 P]PrX 4 -8 H z O (X = Cl, Br), [(C 6 H 5) 4 P]LaBr 4 -8 H 2 0 and [(C 6 H 5) 4 As]MCl 4 -8 H 2 0 (M = La, Ce, Pr, Sm, Eu, Gd) were prepared and investigated by X-ray diffraction. The compounds were found to be isotypic with [(C 6 H 5) 4 As]NdCl 4 -8 H 2 0, which was structurally characterized already previously. The magnetic behaviour of [(C 6 H 5) 4 P]PrX 4 -8 H 2 0 (X = Cl, Br) has been studied. 
  Reference    Z. Naturforsch. 40b, 496—499 (1985); eingegangen am 22. November 1984 
  Published    1985 
  Keywords    , As, M = La, Ce, Pr, Sm, Eu, Gd, X = Cl, Br), M = La, Ce, Pr, Sm, Eu, Gd, X = Cl, Br) Preparation, Lanthanide Complexes, X-Ray, Magnetism 
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 Identifier    ZNB-1985-40b-0496 
 Volume    40 
90Author    Heinrich Lang, Laszlo Zsolnai, Gottfried HuttnerRequires cookie*
 Title    Pentacarbonyl-Metallkomplexe von Phosphor(+I)-Chelaten Pentacarbonyl Metal Complexes of Phosphorus(+I) Chelates  
 Abstract    Halogenphosphinidene Complexes, Phosphorus(+ I) Chelates Phosphorustrihalides react with Na 2 [M 2 (CO) 10 ] (M = Cr, Mo, W) to give phosphinidene com-plexes [(CO) 5 M] 2 P—Hal. These species are transformed into phosphorus(+ I)-chelate compounds [(CO) 5 M] 2 P-LL with LL = tropolonate or 8-hydroxychinolate. 
  Reference    Z. Naturforsch. 40b, 500—506 (1985); eingegangen am 27. Dezember 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0500 
 Volume    40 
91Author    Herbert Bissinger, Wolfgang BeckRequires cookie*
 Title    Metallkomplexe mit biologisch wichtigen Liganden, XXXIX [1] Platin(IV)-Komplexe mit a-Aminosäure-und Peptidestern; 15 N-und 195 Pt-NMR-Spektren von «-Aminosäuren-Platin-Komplexen Metal Complexes with Biologically Important Ligands, XXXIX [1] Platinum(IV) Complexes with a-Amino Acid Esters and Peptide Esters; l3 N and 14r, Pt NMR Spectra of Platinum Complexes with a-Amino Acids  
 Abstract    The platinum(IV) complexes PtX 4 L 2 (X = Cl, Br; 2 X = oxalate; L = glyOEt, glyglyOEt, gly-cleuOEt; 2 L = metOEt) have been obtained by oxidative addition of halogenes to platinum(II) compounds PtX 2 L2-A high field shift of <3 15 N (—50 ppm) is observed for the coordi-nated amino acid ligand of various platinum complexes, compared to the free ligand. Platinum(II) and platinum(IV) can be distinguished by their 195 Pt NMR signals. 
  Reference    Z. Naturforsch. 40b, 507—511 (1985); eingegangen am 12. November 1984 
  Published    1985 
  Keywords    a-Amino Acid Esters, Peptide Esters, Platinum(IV) Complexes, "N NMR Spectra, 195 Pt NMR Spectra 
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 Identifier    ZNB-1985-40b-0507 
 Volume    40 
92Author    Udo Kunze, Hussain Jawad, Wolfgang Hiller, Regina NaumerRequires cookie*
 Title    Phosphinsubstituierte Chelatliganden, XIV [1] Wasserstoff-Brückenbindung in THF-Addukten von Tetracarbonylchrom-und -molybdänkomplexen mit P,S-koordinierten Phosphinothioformamid-Liganden. Kristallstruktur von [(CO) 4 Cr(PPh 2 C(S)NHMe)] THF Phosphine-Substituted Chelate Ligands, XIV [1] Hydrogen Bonding in THF-Adducts of Tetracarbonylchromium and -molybdenum Complexes with P,S-Coordinated Phosphinothioformamide Ligands. Crystal Structure of [(CO) 4 Cr(PPh 2 C(S)NHMe)] * THF  
 Abstract    The tetracarbonyl chromium and molybdenum P,S-chelate complexes la, b and 2a, b are obtained by low-temperature photolysis of the metal hexacarbonyls with the neutral phos-phinothioformamide ligands, Ph 2 PC(S)NHR (R = Me (a), Ph (b)), as stoichiometric 1/1 THF adducts. A weak N-H---O(THF) hydrogen bond is deduced from the ; H NMR spectra which show a collapse of the N-methyl doublet in la (T c -18 °C) but not in 2a. Unusually small P-C(S) couplings are observed in the 13 C{'H} NMR spectra. The N-methyl chromium complex la crystal-lizes in the triclinic space group P1 (Z = 2) with the lattice constants a = 1076.6(3), b = 1235.8(3), c = 915.1(3) pm, a = 97.99(4)°, ß = 92.73(5)°, y = 87.63(5)°. The planar thioamide unit adopts the Z configuration and is linked to the tetrahydrofuran molecule by a hydrogen bond (N-H1-031 164°) with an 0---H contact distance of 191 pm. 
  Reference    Z. Naturforsch. 40b, 512—517 (1985); eingegangen am 23. November 1984 
  Published    1985 
  Keywords    Hydrogen Bonding, THF-Adducts, Phosphinothioformamide Complexes, Crystal Structure, Chromium Complex 
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 Identifier    ZNB-1985-40b-0512 
 Volume    40 
93Author    Wolfgang Gerhartz, Friedrich-Wilhelm Grevels, WernerE. Klotzbücher, ErnstA. Koerner Von Gustorf, RobinN. PerutzRequires cookie*
 Title    Low-Temperature Matrix Photochemistry of (f/ 4 -Diene)tetracarbonylchromium Complexes  
 Abstract    Photolysis of (^ 4 -diene)Cr(CO) 4 complexes (diene = butadiene, trans,trans-2,4-hexadiene, 2,3-dimethylbutadiene) in Ar, N 2 , and CO matrices at 10-12 K was monitored by infrared and UV-Vis spectroscopy. In argon and dinitrogen matrices loss of CO ist the predominant photoreaction. The resulting fac-(rf-diene)Cr(CO) 3 can take up N 2 from the matrix to form (?7 4 -diene)Cr(CO) 3 (N 2). In the case of the hexadiene complex this process requires matrix an-nealing subsequent to photolytic loss of CO. Photolysis in CO matrices, by contrast, results in stepwise displacement of the diene ligand, yielding (/7 2 -diene)Cr(CO) 5 and ultimately Cr(CO) 6 . 
  Reference    Z. Naturforsch. 40b, 518—523 (1985); received November 13 1984 
  Published    1985 
  Keywords    Matrix Isolation, Photochemistry, Carbonylchromium Diene Complexes, IR Spectra 
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 Identifier    ZNB-1985-40b-0518 
 Volume    40 
94Author    Hans Möhrle, RomanusThomas Platzek, Wille, Detlef WendischRequires cookie*
 Title    Trisubstituted Cyclohexanes  
 Abstract    Cyclotrimerisation. Vinylketones. Mannich Bases. NMR Spectra C-Tertiary vinylketones or the corresponding masked vinylketone derivatives react with pyrrolidin-2-one in the system sodium hydride/dimethylsulfoxide to substituted cyclohexanes of the 1.3,5-and sometimes additionally of the 1,2,4-type. Only acetophenone Mannich bases bear-ing a /^-hydroxy or a dimethylamino group failed in cyclization. 
  Reference    Z. Naturforsch. 40b, 524 (1985); eingegangen am 12. November 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0524 
 Volume    40 
95Author    Dimeric Naphthoquinones, Hartmut LaatschRequires cookie*
 Title    Dimere Naphthochinone, 13* Synthese m-substituierter 4-Methoxy-l-naphthole — ß-Halogenalkylether als Schutzgruppen für Phenole Synthesis of ra-Substituted 4-Methoxy-l-naphthols -/3-Haloalkyl Ethers as Protective Groups in Phenols  
 Abstract    m-Substituted naphthohydroquinone monoethers are difficult to synthesize by direct alkyla-tion. They are conveniently obtainable now in the following way: Acid-catalyzed reaction of naphthohydroquinones with /3-haloethyl alcohols affords monoethers 5 in high yield which are conventionally alkylated forming 6. In 6 the protective group is cleaved off via the vinyl ether or, under milder conditions, by bromine/iodine exchange and fragmentation with zink. 
  Reference    Z. Naturforsch. 40b, 534—542 (1985); eingegangen am 23. Mai 1984 
  Published    1985 
  Keywords    Naphthols, Protective Groups, Haloalkyl Ethers 
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 Identifier    ZNB-1985-40b-0534 
 Volume    40 
96Author    Atta-Ur -Rahman, Irshad Ali, M. Iqbal, ChaudharyH E JRequires cookie*
 Title    NMR and Mass Spectroscopic Studies on Catharine  
 Abstract    The 13 C NMR of Catharine is reported. A temperature-dependent study of the 'H NMR of Catharine indicates that it exists as two conformers at room temperature. At higher temperatures, the distinction between the two conformers disappears with the higher rate of equilibration. The mass spectral fragmentation of Catharine as established by link scan measurements is also re-ported. 
  Reference    Z. Naturforsch. 40b, 543—545 (1985); received August 20/December 20 1984 
  Published    1985 
  Keywords    Catharine, Conformational Analysis, 13 C NMR 
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 Identifier    ZNB-1985-40b-0543 
 Volume    40 
97Author    Salimuzzaman Siddiqui, S. Imtiaz Haider, S.Salman Ahmad, B. Shaheen, SiddiquiH E JRequires cookie*
 Title    Some Extensions of von Braun (BrCN) Reaction on Organic Bases, Part IV  
 Abstract    von Braun Cyanogen Bromide Reaction Extensions of von Braun cyanogen bromide reaction have been undertaken on some aliphatic and heterocyclic amines. Monocyanamides of all these bases yielded their respective urea and carboxamide derivatives on hydrolysis with dilute hydrochloric acid. They also gave the amido derivatives on reaction with Zn/HCl, as in the case of diisobutyl and di-2-butyl cyanamides. 
  Reference    Z. Naturforsch. 40b, 546—549 (1985); received June 5 1984/January 3 1985 
  Published    1985 
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 Identifier    ZNB-1985-40b-0546 
 Volume    40 
98Author    M. Singh, J. SinghRequires cookie*
 Title    Phytochemical Investigation of Cassia spectablis Seeds Isolation and Structural Studies of Two New Flavone Glycosides  
 Abstract    Cassia Spectablis, Leguminosae, Flavone Glycosides From the seeds of Cassia spectablis 6-hydroxy-4'-methoxy flavone-6-0-arabinopyranoside and 3,5-dihydroxy-7,3',4'-trimethoxy flavone-3-0-arabinopyranoside have been isolated and their structure elucidated. 
  Reference    Z. Naturforsch. 40b, 550—552 (1985); received July 27 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0550 
 Volume    40 
99Author    Gioacchino Falsone, Claudia SchneiderRequires cookie*
 Title    Über Inhaltsstoffe von  
 Abstract    Euphorbiaceae, 8. Mitt. [1] Triterpenester und Triterpenalkohole aus Euphorbia biglandulosa Desf. Constituents of Euphorbiaceae, 8. Comm. [1] Triterpen Esters and Triterpen Alcohols from Euphorbia biglandulosa Desf. Fatty acids and acetic acid esters of lanosterol and cycloartenol and triterpens alcohols were isolated from the latex of Euphorbia biglandulosa Desf. The triterpenesters were identified as (E,Z)-2,4-decadienoyllanosterol (la), (E,Z)-2,4-octadienoyllanosterol (lb), (E,Z)-2,4-oc-tadienoylcycloartenol (2a), (2E,4Z)-2,4,6-decatrienoyllanosterol (lc), (2E,4Z)-2,4,6-deca-trienoylcycloartenol (2b), lanosterylacetat (Id) and cycloartenylacetat (2c) by IR-, 'H-NMR-and MS-spectroscopy and hydrolysis. The triterpens alcohols were identified as butyrospermol, cyclo-artenol, 24-methylencycloartanol and obtusifoliol. 
  Reference    Z. Naturforsch. 40b, 553—555 (1985); eingegangen am 12. Oktober 1984 
  Published    1985 
  Keywords    Euphorbiaceae, Triterpen Alcohols, Triterpen Esters 
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 Identifier    ZNB-1985-40b-0553 
 Volume    40 
100Author    F. Camps, A. Conchillo, A. MesseguerRequires cookie*
 Title    Preparation of Precocene 2 and 3,4-Epoxyprecocene 2 Deuterated Analogues at C-3, C-4 and C-3, C-4  
 Abstract    A convenient route for the preparation of title compounds from benzopyran-4-one (1) and its corresponding 3,3-2 H 2 deuterated analogue (2) is reported. Treatment of 1 or 2 with lithium aluminum deuteride followed by dehydration afforded, respectively, 4-2 H precocene (3c) or 3,4-2 H 2 precocene (3b). Likewise, reduction of 2 with lithium aluminum hydride and subsequent dehydration led to the formation of 3-2 H precocene (3d). Finally, the corresponding 3,4-epoxy derivatives of all these compounds were prepared in good yields by conventional procedures. 
  Reference    Z. Naturforsch. 40b, 556—558 (1985); received November 23 1984 
  Published    1985 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0556.pdf 
 Identifier    ZNB-1985-40b-0556 
 Volume    40 
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