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1987 (274)
61Author    Marianne Baudler, Doris DüsterRequires cookie*
 Title    Beiträge zur Chemie des Phosphors, 175 [1] Dinatrium-hexadecaphosphid: Darstellung durch Spaltung von weißem Phosphor mit Natrium Contributions to the Chemistry of Phosphorus, 175 [1] Disodium Hexadecaphosphide: Preparation via Cleavage of White Phosphorus with Sodium  
 Abstract    Disodium Hexadecaphosphide, Polyphosphides. White Phosphorus, Conjuncto-phosphanes Disodium hexadecaphosphide has been prepared as a solvent adduct by reacting white phos-phorus with sodium (atomic ratio 3 :1) in boiling tetrahydrofuran or monoglyme in the presence of 18-crown-6. 
  Reference    Z. Naturforsch. 42b, 335—336 (1987); eingegangen am 30. Oktober 1986 
  Published    1987 
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 Identifier    ZNB-1987-42b-0335 
 Volume    42 
62Author    Somluck Ruangsuttinarupap, Claus Friebel, Kurt DehnickeRequires cookie*
 Title    Synthese, IR-, EPR-und Elektronenspektren der Dischwefel-dinitrid-Komplexe [CUC1 2 (CH 3 CN)] 2 -(/I-S 2 N 2 ) und [CuCl 2 ] 2 * (/I-S 2 N 2 ) Synthesis, IR, EPR, and Electronic Spectra of the Disulfur Dinitride Complexes [CUC1 2 (CH 3 CN)] 2 * (w-S 2 N 2 ) and [CuCl 2 ] 2 -(w-S 2 N 2 )  
 Abstract    [CuCl 2 (CH 3 CN)] 2 -(W-S 2 N 2) is prepared by the reaction of trithiazyl chloride with CuCl in acetonitrile solution. Thermolysis at 120 °C yields [CuCl 2 ] 2 -(W-S 2 N 2). The complexes are charac-terized by their IR, EPR, and electronic spectra. 
  Reference    Z. Naturforsch. 42b, 337—340 (1987); eingegangen am 24. November 1986 
  Published    1987 
  Keywords    Disulfur Dinitride Complexes of Copper(II), EPR Spectra, Electronic Spectra, Synthesis, IR Spectra 
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 Identifier    ZNB-1987-42b-0337 
 Volume    42 
63Author    Dieter Sellmann, Gerhard BinkerRequires cookie*
 Title    Übergangsmetall-Komplexe mit Schwefelliganden, XXVII* Synthese und Reaktivität der Nitrosyl-und Nitrido-Ruthenium-Komplexe mit 1,2-Benzoldithiolat-Liganden [Ru(NO)(S 2 C 6 H 4 ) 2 r bzw. [Ru(N)(S 2 C 6 H 4 ) 2 r Transition Metal Complexes with Sulfur Ligands, XXVII* Synthesis and Reactivity of the Nitrosyl-and Nitrido-Ruthenium Complexes with 1,2-Benzenedithiolate Ligands [Ru(NO)(S 2 C 6 H 4 ) 2 ]~ and [Ru(N)(S 2 C 6 H 4 ) 2 ]~, Respectively  
 Abstract    The reaction of [Ru(NO) 2 (PPh 3) 2 ], [RuCl(NO) 2 (PPh 3) 2 ]PF 6 or [RuCl 3 (NO)(PPh 3) 2 ] with 1,2-benzenedithiolate(—2), C 6 H 4 S 2 : ~, leads to the 16e"-complex [Ru(NO)(S 2 C 6 H 4) 2 ]~, which was isolated as the NBu 4 + salt (1). The square pyramidal anion in [NBu 4 ][Ru(NO)(S 2 C 6 H 4) 2 ] coordi-nates PMe 3 with rearrangement of the sulfur ligands to give the six-coordinate cis-[NBu 4 ][Ru(NO)(PMe 3)(S 2 C 6 H 4) 2 ] (3); the rearrangement of the C 6 H 4 S 2 2 "-ligands from trans to eis coordination is proved by 13 C NMR spectroscopy. [Ru(NO)(S 2 C 6 H 4) 2 ]~ is rapidly reduced even under mild conditions. Reaction of 1 with NaBH 4 in MeOH leads to the reduction of NO to a nitrido ligand and the concomitant oxidation of (formal) Ru(III) to Ru(VI) yielding [NBu 4 ][Ru(N)(S^C 6 H 4)->] (2). This compound is also formed when the nitrosyl complex is reacted with SiMe 3 N 3 . [Ru(NO) 2 (PPh 3) 2 ] and [RuCl(NO) 2 (PPh 3) 2 ]PF 6 are denitrosylatedby dttd 2 ~ (dttd 2 " = 2,3,8,9-dibenzo-l,4,7,lÖ-tetrathiadecane(—2)) to give [Ru(dttd)(PPh 3) 2 ], 
  Reference    Z. Naturforsch. 42b, 341—347 (1987); eingegangen am 10. November 1986 
  Published    1987 
  Keywords    Ruthenium Sulfur Complexes, Synthesis, Reactions 
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 Identifier    ZNB-1987-42b-0341 
 Volume    42 
64Author    Sigurd Elz, Martin Dräger, Walter SchunackRequires cookie*
 Title    Synthese und absolute Konfiguration kettenverzweigter, Cimetidin-analoger Thioether Synthesis and Absolute Configuration of Chain Branched Cimetidine Analogous Thioethers  
 Abstract    Chain branched Cimetidine analogous thioethers. promising building blocks for the preparation of H : -histaminergic compounds, were svnthetized from chiral aminoalkanethiols. Enantiomeri-callv pure amino acids or aminoalcohols were used as starting materials. In one case, a resolution via neutral and acid di-0-(4-toluoyl)tartrates was achieved in good yields and satisfying enan-tiomeric excess. The absolute configuration of an ethyl branched compound was determined using X-ray diffraction and anomalous dispersion. 
  Reference    Z. Naturforsch. 42b, 348—354 (1987); eingegangen am 22. September 1986 
  Published    1987 
  Keywords    Aminoalkanethiols, Cimetidine, Crystal Structure, Histamine H : -Receptor Impromidine 
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 Identifier    ZNB-1987-42b-0348 
 Volume    42 
65Author    AndrzejJ. Małkiewicz, Barbara NawrotRequires cookie*
 Title    The 2-Thioanalogues of /RNA Components Derived from 5-Hydroxyuridine  
 Abstract    The synthesis of 5-cyanomethoxy-2-thiouracil (5b) is described. The acid catalysed ethanolysis of 5b leads to 5-ethoxycarbonylmethoxy-2-thiouracil (5a). Condensations of 5-methoxy-2-thiouracil (5) and 5a with the sugar component 7 using the "silyl method" yield peracylated 5-methoxy-2-thiouridine (8) and 5-ethoxycarbonylmethoxy-2-thiouridine (8a), which under treatment with sodium methanolate/methanol afford title 5-methoxy-2-thiouridine (1) (s 2 mo 5 U) and 5-methoxycarbonylmethoxy-2-thiouridine (2) (s : mcmo 5 U), respectively. 
  Reference    Z. Naturforsch. 42b, 355—359 (1987); received June 30 1986 
  Published    1987 
  Keywords    Modification /RNA Components, Modified Uridines, 2-Thiouridine Derivatives, Nucleosides Synthesis 
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 Identifier    ZNB-1987-42b-0355 
 Volume    42 
66Author    AndrzejJ. Małkiewicz, Barbara Nawrot, Elżbieta SochackaRequires cookie*
 Title    Transformation of Some /RNA "Wobble Uridines" to their 2-Thioanalogues  
 Abstract    -5-[(N-trifluoroacetyl)methoxycarbonylmethylaminomethyl]uridine (5) and 2',3'-0-isopropylidene-5-ethoxycarbonylmethoxyuridine (6) have been prepared using as the substrates 2',3'-0-isopropylidene-5-chloromethyluridine (11) and 2',3'-0-isopropylidene-5-hydroxyuridine (8), respectively. The transformation of 5 and 6 into respective 2,5'-anhydro-nucleosides 16 and 10 followed by treatment of 16 and 10 with liquid hydrogen sulphide/pyridine system produces 2\3'-0-isopropyhdene-5-[(N-trifluoroacetyl)methoxycarbonylmethylamino-methyl]-2-thiouridine (17) and 2',3'-0-isopropylidene-5-ethoxycarbonylmethoxy-2-thiouridine (18). The acid catalysed methanolysis of 6 and 18 yields 5-methoxycarbonylmethoxyuridine (4) and its 2-thioanalogue 4a, while refluxing of 5 and 17 with 50% acetic acid gives 5-[(N-tri-fluoroacetyl)methoxycarbonylmethylaminomethyl]uridine (2) and its 2-thioanalogue 2a. 
  Reference    Z. Naturforsch. 42b, 360—366 (1987); received June 30 1986 
  Published    1987 
  Keywords    rRNA Components, Modified Uridines, 2-Thiouridine Derivatives, Nucleosides Synthesis 2', 3'-0-Isopropylidene 
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 Identifier    ZNB-1987-42b-0360 
 Volume    42 
67Author    Harald Labischinski, Dieter Naumann, Gerhard Barnickel, Wolfgang Dreißig, Wojciech Gruszecki, Andreas Hofer, Hans BradaczekRequires cookie*
 Title    Comparison between the Molecular and Crystal Structures of a Benzylpenicillin Ester and its Corresponding Sulfoxide with Drastically Reduced Biological Activity  
 Abstract    A comparative X-ray structure determination was performed to elucidate possible conforma-tional differences between penicillins and penicillin sulfoxides. Penicillin-G-acetoxy-methylester and its Iß-oxide were used as model substances, because the only chemical difference between both compounds resides in the thiazolidine ring sulfur oxidation. On the basis of the X-ray data as well as of infrared measurements it is discussed that the drastically reduced biological activity of the penicillin-G-sulfoxide might be related to conformational differences in thiazolidine ring puckering or, even more simply, to the geometric position of the sulfoxide oxygen atom, both of which may hamper the proper reaction of the sulfoxide with its target enzyme(s). 
  Reference    Z. Naturforsch. 42b, 367—375 (1987); received June 30/0ctober 14 1986 
  Published    1987 
  Keywords    X-Ray, Penicillin G, Penicillin G Sulfoxide, Thiazolidine Ring Conformation, Structure Activity Relationships 
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 Identifier    ZNB-1987-42b-0367 
 Volume    42 
68Author    George Sosnovsky, Jan Lukszo, PeterL. Gutierrez, Klaus SehefflerRequires cookie*
 Title    EPR and ENDOR of Sodium Complexes of Spin Labeled Monoazacrown Ethers  
 Abstract    Azacrown Ethers, Nitroxyl Radicals, Synthesis, EPR. ENDOR Sodium complexes 3 and 5 of the spin labeled monoazacrown ethers 2.2,15,15-tetramethyl-l-aza-4,7,10,13-tetraoxacyclopentadecane-l-oxyl (2) and 1.4,7,10-tetraoxa-13-(2',2',6'.6'-tetramethyl-piperidine-l'-oxyl-4'-yl)azacyclopentadecane (4) were synthesized and studied by EPR and ENDOR spectroscopies. The hyperfine splitting parameter and the g value of the complex 5, containing the exocyclic nitroxyl moiety, were identical to the parent complexon 4, i.e., a^ — 15.6 G, g = 2.0060 ± 0.0001. In contrast, the data for the complex 3, containing the endocyclic nitroxyl moiety were different. Thus, the spectrum of the complex 3 was a triplet of quartets with a N = 15.7 G, a Na = 2.47 G, g = 2.0062 ± 0.0001, whereas the spectrum of the parent complexon2 was a triplet with a N -15.5 G. g = 2.0059 ± 0.0001. The interaction between the sodium cation and the nitroxyl moiety in 3 was further confirmed by the sodium ENDOR transition at 7.27 MHz. 
  Reference    Z. Naturforsch. 42b, 376—380 (1987); received September 15 1986 
  Published    1987 
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 Identifier    ZNB-1987-42b-0376 
 Volume    42 
69Author    W. Preetz, H.N V AllwördenRequires cookie*
 Title    Darstellung und Schwingungsspektren von Chloro-Bromo-Ruthenaten(IV) einschließlich der Stereoisomeren Preparation and Vibrational Spectra of Chloro-Bromo-Ruthenates(IV) Including Stereoisomers  
 Abstract    The mixed chloro-bromo complexes [RuCl"Br 6 _"] 2_ , n = 1—5, have been separated for the first time by ion exchange chromatography on diethylaminoethylcellulose. Due to the stronger trans-effect of Br compared with Cl, on treatment of [RuBr 6 ] 2 ~ with Cl" in the presence of Br 2 nearly pure ciy//ac-isomers,andbyreactionof [RuCl 6 ] 2 " withBr"/Br 2 nearlypurerran5/mer-isomersforn = 2,3,4 are formed. The vibrational spectra of the mixed ligand complexes are completely assigned according to point groups D 4h , C 4v , C 3v and C 2v , respectively. The bands are observed in the characteristic regions: v(RuCl): 340-270 > v(RuBr): 245-190 > <3(ClRuCl): 170-140 > ö(ClRuBr) > <3(BrRuBr): 125—90 > v L : < 100 cm" 1 . The lower stability of the hexahalogeno complexes of Ru(IV), 4d, compared with the homologous complexes of Os(IV), 5d, is confirmed by a decrease of the force field constants by approximately 15%. 
  Reference    Z. Naturforsch. 42b, 381—386 (1987); eingegangen am 18. Dezember 1986 
  Published    1987 
  Keywords    Chloro-Bromo-Ruthenates(IV), Stereoisomers, r/wis-Effect, IR Spectra, Raman Spectra 
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 Identifier    ZNB-1987-42b-0381 
 Volume    42 
70Author    Requires cookie*
 Title    Sn-NMR-Untersuchungen und die Kristall-und Molekülstrukturen von Bis(tri-terf-butyIstannyl)oxid und Bis(tribenzylstannyl)sulfid  
  Reference    Z. Naturforsch. 42b, 387 (1987) 
  Published    1987 
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 Identifier    ZNB-1987-42b-0387 
 Volume    42 
71Author    Peter Hofmann, Helmut Heiß, Gerhard MüllerRequires cookie*
 Title    Synthese und Molekülgeometrie von Dichloro[i/ 2 -bis(di-r-butylphosphino)methan]pIatin(II), Pt(dtbpm)Cl 2 . Die Elektronenstruktur von 1,3-Diphosphaplatinacyclobutan-Fragmenten The Electronic Structure of 1,3-Diphosphaplatinacyclobutane Fragments  
 Abstract    Synthesis and Molecular Structure of Dichloro[?/ 2 -bis(di-/-butylphosphino)methane]platinum(II), Pt(dtbpm)Cl 2 . 1,3-Diphosphaplatinacyclobutanes, Molecular and Electronic Structure of Bent d 10 -ML 2 Fragments, Synthesis and Molecular Geometry of Pt(dtbpm)Cl 2 
  Reference    Z. Naturforsch. 42b, 395—409 (1987); eingegangen am 4. August 1986 
  Published    1987 
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 Identifier    ZNB-1987-42b-0395 
 Volume    42 
72Author    Aida El-Kholi, Ruth Christophersen, Ulrich Müller, Kurt DehnickeRequires cookie*
 Title    Synthese und Kristallstruktur von [N(PPh 3 ) 2 ][VCl3(N 3 S2)] * CyHj Synthesis and Crystal Structure of [N(PPh3)2][VCl3(N 3 S 2 )] * C 7 H 8  
 Abstract    Cyclo-thiazeno-trichlorovanadate(V), Synthesis, IR Spectra, Crystal Structure [N(PPh 3) 2 ][VCl 3 (N 3 S 2)]-C 7 H 8 is formed by the reaction of VC1 2 (N 3 S 2) with excess PPh 3 in CH 2 C1 2 and subsequent treatment of the reaction mixture with toluene, as well as by the reaction of VC1 2 (N 3 S 2) with [N(PPh 3) 2 ]Cl in CH 2 C1 2 in the presence of toluene. The compound forms red crystals, which have been characterized by IR spectroscopy. The crystal structure was determined by X-ray diffraction (1433 observed, independent reflexions, R = 0.070). Crystal data: mono-clinic, space group Cc, Z = 4, a = 994.1, b = 2148.0, c = 2055.2 pm, ß = 90.03°. The compound consists of [N(PPh 3) 2 ]® cations and [VCl 3 (N 3 S 2)] e anions, in which the vanadium atom is five-coordinated by threee chlorine atoms and two nitrogen atoms, and is part of a planar VN 3 S 2 ring. 
  Reference    Z. Naturforsch. 42b, 410—414 (1987); eingegangen am 28. Oktober 1986 
  Published    1987 
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 Identifier    ZNB-1987-42b-0410 
 Volume    42 
73Author    Walter AbrielRequires cookie*
 Title    On the Stereochemistry of the Lone-Pair Electrons in AX 6 E-Systems: Dynamically Distorted Anion in (NH 4 ) 2 SeBr 6 , Statically Distorted Anion in l,3-Propanediammonium-Hexabromoselenate(IV) (C 3 N 2 H 12 )SeBr 6  
 Abstract    Using 293 K diffractometer intensity data, the crystal structures of (NH 4) 2 SeBr 6 (1) and [H 3 N(CH 2) 3 NH 3 ]SeBr 6 (2) have been determined by single crystal X-ray technique and refined to a final R w of 0.049 and 0.040, respectively. The dark red crystals of 1 are cubic (space group Fm3m) with a = 10.478(2) Ä and Z = 4. This structure contains SeBe 6 2 ~ octahedra (point symmetry m3m, distance Se —Br: 2.577(2) Ä) in an antifluorite type arrangement of cations and anions. In contrast, the SeBr fi 2-ion in 2 is statically distorted (approximate point symmetry 3m, distance Se-Br min. 2,547(2), max. 2.595(2) Ä. The dark red crystals are orthorhombic (space group Pnma) with a = 17.795(3), b = 7.5037(6), c = 10.476(1) Ä and Z = 4. The results agree with the rules for the appearance of a static/dynamic stereochemical effect of the lone pair electrons given for TeX 6 2 " (X = Cl, Br, I) species (W. Abriel, Acta Crystallogr. B 42, 449 (1986)). Consequently these rules can be extended considering SeX 6 2-as well. Basic structural data for all compounds containing AX 6 2-ions (A = Se, Te; X = Cl, Br, I) known to date are given including the zl-values (R. D. Shannon, Acta Crystallogr. A 32, 751 (1976)) as a measure for the distortion of the octahedral anion. 
  Reference    Z. Naturforsch. 42b, 415—420 (1987); received November 24 1986/January 12 1987 
  Published    1987 
  Keywords    Lone Pair Electrons, Pseudo-Jahn-Teller Effect, Symmetry Rules, Selenates, Crystal Structure 
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 Identifier    ZNB-1987-42b-0415 
 Volume    42 
74Author    KlausR. Pörschke, Richard MynottRequires cookie*
 Title    Bis(dimethyIphosphino)methan-Nickel(0)-Komplexe Bis(dimethylphosphino)methane-Nickel(0) Complexes  
 Abstract    The reaction of tris(ethene)nickel(0) with stoichiometric amounts of bis(dimethylphos-phino)methane (dmpm) in ether at low temperature affords the yellow crystalline, dinuclear complexes (dmpm)Ni 2 (QH 4) 4 (1) and (dmpm)2Ni 2 (C 2 H 4)2 (2). 2 reacts with ethyne to yield (dmpm) 2 Ni 2 (C 2 H 2) 2 (3). When 2 is treated with CO at —40 °C the primary product is (dmpm) 2 Ni 2 (CÖ) 2 (w-CO) (4). At 20 °C 4 is converted by additional CO into (dmpm) 2 Ni 2 (CO) 4 (5), which has already been characterized as the reaction product of Ni(CO) 4 with dmpm. In compounds 1—5 the bidentate dmpm acts as a bridging and not as a chelating ligand. The structures of complexes 1—4 were assigned on the basis of their 13 C and 31 P NMR spectra. 
  Reference    Z. Naturforsch. 42b, 421—424 (1987); eingegangen am 9. August 1986 
  Published    1987 
  Keywords    Carbonyl, Ethyne, Nickel(O), Phosphane, 13 C NMR Spectra 
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 Identifier    ZNB-1987-42b-0421 
 Volume    42 
75Author    Sylvia Ernst, Volker Kasack, Christian Bessenbacher, Wolfgang KaimRequires cookie*
 Title    Ein-und zweikernige Bis(2,2'-bipyridyI)ruthenium-Komplexe mit N,0-Mode!liganden für Dehydrogenase-Cofaktoren Mono-and Binuclear Bis(2,2'-bipyridine)ruthenium Complexes with N,0-Ligands Modelling Dehydrogenase Cofactors  
 Abstract    Coordination of substitutionally inert [Ru(bpy) 2 ] 2+ fragments (bpy: 2,2'-bipyridine) to the a-iminoketone chelate ligands pyrazine-2-dimethylcarboxamide (4) and 4,7-phenanthroline-5,6-dione (5) yields the complexes [(N,0-4)Ru(bpy) 2 ] 2 ®, [(0,0'-5 e)Ru(bpy) 2 ]® and {(N,0; N',0'-5)[Ru(bpy) 2 ] 2 } 4 ® which exhibit a rich electrochemistry. The distinctly different electronic structures of the complexes are evident from the ESR behaviour of paramagnetic intermediates: N.O-coordinated complexes have the unpaired electron residing in the ligand n system upon reduction, albeit with g<2 for the complex of 4 but with g>2 for the binuclear complex of 5. The paramagnetic 0,0'-coordinated mononuclear complex with 5 has its redox potentials shifted positively relative to that of the binuclear system. These results are particularly noteworthy because 4 and 5 can be regarded as model compounds for the flavin and methoxatin dehydrogenase cofactors. 
  Reference    Z. Naturforsch. 42b, 425—430 (1987); eingegangen am 6. August 1986 
  Published    1987 
  Keywords    Dehydrogenase Cofactors, Ruthenium Complexes, Oxidation States, ESR Spectra, a-Iminoketones 
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 Identifier    ZNB-1987-42b-0425 
 Volume    42 
76Author    Peter Böttcher, Heinz Buchkremer-HermannsRequires cookie*
 Title    Darstellung und Kristallstruktur des Bis((—)-strychninium)hexasulfids, ^IH^J^C^^SÖ Synthesis and Crystal Structure of Bis((—)-strychninium)hexasulfide, (C 2 iH 2 3N20 2 )2S6  
 Abstract    Crystal Structure, Polychalcogenides Bis((—)-strychninium)hexasulfide has been synthesized from (—)-strychnine and (NH 4) 2 S 5 in ethanolic solution at 0 °C. It is monoclinic, S. G. C2, with a = 34.21(1) Ä, b = 7.59(2) A, c = 7.74(1) A, ß = 103.0(1)°. As expected, the S 6 2--anions occur as unbranched zig-zag-chains. Surprisingly, they do not show the common helical all-trans-conformation but the all-cis-confor-mation. The cations and the anions are linked by hydrogen bridges, running from the terminal sulfur atoms of the polysulfide dianions to the protonated nitrogen atoms of the monoprotonated (—)-strychnine molecules. 
  Reference    Z. Naturforsch. 42b, 431—434 (1987); eingegangen am 20. Oktober/15. Dezember 1986 
  Published    1987 
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 Identifier    ZNB-1987-42b-0431 
 Volume    42 
77Author    Oligophosphine Ligands, XxiiiRequires cookie*
 Title    Oligophosphan-Liganden, XXIII** Synthese und Chemie des metallacyclischen Eisenkomplexes [Me 2 P(CH 2 )3] 2 P(CH 2 ) 3 P(Me)CH 2 -FeH  
  Reference    Z. Naturforsch. 42b, 435 (1987) 
  Published    1987 
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 Identifier    ZNB-1987-42b-0435 
 Volume    42 
78Author    RalfG. Dietzgen, Evamarie Sander, Jürgen Christner, Günther JungRequires cookie*
 Title    Examination of a New Cross-Linker in Monoclonal Antibody Reaction Against the C-Terminus of Tobacco Mosaic Virus Coat Protein  
  Reference    Z. Naturforsch. 42b, 441—453 (1987); received December 3 1986 
  Published    1987 
  Keywords    Monoclonal Antibody, Synthetic Antigen, Enzyme-Linked Immunosorbent Assay, Tobacco Mosaic Virus Protein, Cross-Linking Reagent 
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 Identifier    ZNB-1987-42b-0441 
 Volume    42 
79Author    Ekkehard Lindner, Konrad Auch, Wolfgang Hiller, Riad FawziRequires cookie*
 Title    Darstellung und Eigenschaften von und Reaktionen mit metallhaltigen Heterocyclen, LVII [1] Stabilisierung der RPSR'-Gruppe in der Koordinationssphäre von Carbonylmangan-Komplexen Preparation and Properties of, and Reactions with Metal-Containing Heterocycles, LVII [1] Stabilization of the RPSR' Group in the Coordination Sphere of Carbonylmanganese Complexes  
 Abstract    Stabilization of RPSR', Manganese Complexes, X-Ray Stabilization of a RPSR' function is possible by its incorporation into the mono-and binuclear manganese complexes, r-BuP[Mn(CO) 5 ]SPh (3b) and (u-CH 3 PSPh)(u-SPh)Mn 2 (CO) 8 (4a), re-spectively. Formation of 4a is accomplished via the precursors 3a and PhSMn(CO) 5 (5), which are both unstable. 3a, b and 5 are formed by reaction of RP(Cl)SPh (la, b) [R = CH 3 (a), t-Bu (b)] with [Mn(CO) 5 ]~ (2). 4a crystallizes in the orthorhombic space group Pbca with Z = 8. 
  Reference    Z. Naturforsch. 42b, 454—458 (1987); eingegangen am 9. Oktober/17. Dezember 1986 
  Published    1987 
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 Identifier    ZNB-1987-42b-0454 
 Volume    42 
80Author    Karol Maskos, Hubert Kaibacher, Wieland Stock, Wolfgang VoelterRequires cookie*
 Title    The Interaction of Copper(II) Ions with the Thyrotropin-Releasing Hormone Synthesized by Adpoc Protection  
 Abstract    Thyrotropin-Releasing Hormone (TRH), Copper(II) Ion Complexes The copper(II) complexes of the thyrotropin-releasing hormone (L-pyroglutamyl-L-histidyl-L-prolinamide, TRH) in 3 M LiCl-water solutions were investigated as a function of pH by circular dichroism, absorption, and electron spin resonance spectroscopy. It was concluded that a simple ML (IN) complex of copper(II)-TRH is formed over the pH range 4.0-4.5, while 2N and 3N complexes are present in the solutions of pH 4.4—6.0. From pH 6.1 to 9.8 an ML 2 (4N) complex is formed and this species is the only complex found over the pH range 6.5—8.5. At pH values above 9.0 a 3N species is formed in addition to a 2N complex which is present in the solutions of pH 11.3. These observations are controversial to former reports. TRH [1—2] was synthesized using the fully Adpoc (adamantyl-isopropyloxycarbonyl)-protected histidine. From the synthesis the advantages of the Adpoc group, cleavable under extreme mild acidolytic conditions, become obvious. 
  Reference    Z. Naturforsch. 42b, 459—466 (1987); received September 2 1986 
  Published    1987 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0459.pdf 
 Identifier    ZNB-1987-42b-0459 
 Volume    42 
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