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1985 (316)
61Author    Klaus Brodersen, Hans-Ulrich Hummel, Karl Böhm, Heribert ProcherRequires cookie*
 Title    Zur Koordination von Thiocyanat in ternären Metallkomplexen: CdZn(NCS) 4 und die Kristallstruktur von BaZn(NCS) 4 -7H 2 0 On the Coordination of Thiocyanate in Ternary Metal Complexes: CdZn(NCS) 4 and the Crystal Structure of BaZn(NCS) 4 -7H 2 0  
 Abstract    Crystal Structure, Ternary Metal Complexes CdZn(NCS) 4 (1): studied by means of Precession and Guinier technique. The compound seems to be isomorphous to CdHg(SCN) 4 but with exchanged metal positions consisting of tetrahedral Cd(SCN) 4 and Zn(NCS) 4 groups. (M r = 410.1, space group I 4, Z = 2, a = 1110.89(2) pm, c = 444.36(2) pm, V = 548.37-10 6 pm 3 , d c = 2.48 g-cm' 3 .) BaZn(NCS) 4 -7H 2 0 (2): prepared by reaction of Ba(NCS) 2 -3H 2 0 with Zn(NCS) 2 in H 2 0. The crystal structure was solved with X-ray methods. (M r = 561.14, space group I 4, Z = 8, a = 1894.7(6) pm, c = 1032.4(3) pm, V = 3706.2-10 6 pm 3 , /L(AgKa) = 55.83 pm, d c = 2.00 g-cm~ 3 , MAgKa) = 18.89 cm 1 , F(000) = 2143.8, T = 298 K, final R = 0.0548 for 1475 independent reflections.) The structure consists of two crystallographic independent Zn(NCS) 4 tetrahedra, while the Ba 2+ cations are surrounded by 9 oxygen atoms of water molecules and 1 sulfur atom of thio-cyanate. The crystal water forms one-dimensional chains, consisting of alternant four-and five-membered rings. 
  Reference    Z. Naturforsch. 40b, 347—351 (1985); eingegangen am 5. Oktober/22. November 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0347 
 Volume    40 
62Author    H. Schmidbaur, R. PichlRequires cookie*
 Title    Diethylamino/methylphosphonium-methylide und ihre Bis(cyclopentadienyI)zirconium(IV)-Komplexe Diethylamino/methylphosphonium-methylides and their Bis(cyclopentadienyl)zirconium(IV) Complexes  
 Abstract    The diethylamino/methylphosphines Me"(NEt 2) 3 _"P (la—c) with n = 0, 1. or 2 have been synthesized from PC1 3 or MePCl 2 , respectively. Addition of methyliodide gave the phosphonium salts Me"(NEt 2) 4 _"P~L (2a—c) with n — 1,2, or 3. These salts were converted into the corre-sponding ylides Me"(NEt 2) 3 _"P=CH 2 (3a—c) with n = 0, 1, or 2. The products are reactive, colorless, distillable liquids, freely soluble in non-polar solvents. — (C 5 H 5) 2 ZrCl 2 when treated with 3b afforded two isomeric products with chelating or monodentate vlide coordination, respec-tively: (C 5 Hs) 2 ZrCl(CH 2) 2 P(NEt 2) 2 (4) and (C 5 H 5) 2 ZrClCH=P(NEt 2) 2 Me (5). In an analogous reaction. 3a gave a dinuclear complex [(C 5 H 5) 2 ZrCP(NEt 2)Me 2 ] 2 (6) whereas no well-defined material could be obtained with the bulky trisamino ylide 3c. All compounds were characterized by their 'H. 13 C, and 31 P NMR spectra. ' 
  Reference    Z. Naturforsch. 40b, 352—356 (1985); eingegangen am 27. November 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0352 
 Volume    40 
63Author    Maria Brenndörfer, HansAlbert Brune, Tony Debaerdemaeker, Reinhard HemmerRequires cookie*
 Title    Synthesen, Kristall-und Molekülstruktur ionischer Nickel-Komplexe mit Phosphanen im kationischen und anionischen Komplex-Teil Syntheses, Crystal and Molecular Structure of Ionic Nickel Complexes with Phosphanes in the Cationic and Anionic Part  
 Abstract    The syntheses of five new nickel-II-complexes of the type [HPR' 3 ][R 3 PNiCl 3 ] (R,R' = C 6 H 5 , n-C 4 H 9 , C 6 H n , C 5 H 9 and R = C 6 H 5 , R' = C 6 H") are described. The structure of the compound [HP(C 6 H u)3][(C 6 H 5) 3 PNiCl3] was determined by X-ray analy-sis. The crystals are monoclinic; space group P2 x /n with the lattice parameters a = 18.180(5), b = 18.842(4), c = 11.173(3) Ä and ß = 107.12(6)°; Z = 4. 
  Reference    Z. Naturforsch. 40b, 357—362 (1985); eingegangen am 18. Oktober 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0357 
 Volume    40 
64Author    Fritz Preuss, Edith Fuchslocher, WilliamS. SheldrickRequires cookie*
 Title    Darstellung und Struktur eines zweikernigen  
 Abstract    Vanadium(V)-Komplexes mit den terminal gebundenen Stickstoffliganden N'C 4 H 9 , NH'C 4 H 9 und NH 2 'C 4 H 9 : [ VCl^i-Cl) (N'C 4 H 9) (NH'C 4 H 9) (NH 2 'C 4 H 9) ] 2 Synthesis and Molecular Structure of a Binuclear Vanadium(V) Complex Containing the Terminal Nitrogen Ligands N'C 4 H 9 , NH'C 4 H 9 , NH 2 'C 4 H 9 : [VC1(//-C1)(N'C 4 H 9)(NH'C 4 H 9)(NH 2 'C 4 H 9)] 2 
  Reference    Z. Naturforsch. 40b, 363 (1985); eingegangen am 2. November 1984 
  Published    1985 
  Keywords    Amino Iminovanadium(V) Compounds, Preparation, X-Ray, 'H NMR Spectra, 51 V NMR Spectra 
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 Identifier    ZNB-1985-40b-0363 
 Volume    40 
65Author    Dieter Sellmann, Lothar ZapfRequires cookie*
 Title    Molybdenum Oxo Complexes of the  
 Abstract    Type [Mo(IV)(0)(S 2) 2 ], [Mo(VI)(0) 2 (S 4)], [MO(IV)(0)(S 4)] and [Mo(IV)(0)(S 5)] with Bi-, Tetra-and Pentadentate Thioether-Thiolate Ligands (S X = Multidentate Thioether-Thiolate Ligand Transition Metal Complexes, Sulfur Ligands Reacting [Mo(0) 2 (acac) 2 ] (acac~ = acetylacetonate) with the tetradentate thioether-thiol ligand 2,3,8.9-dibenzo-l,4,7,10-tetrathiadecane (dttd-H 2) yields ds-[Mo(0) 2 (dttd)]; this com-pound is reduced by PPh, to give [MoO(dttd)], which is also obtained from [MoCl 2 (dttd)] and H 2 0. Depending upon the concentrations of the reactants [MOC1 4 (THF) 2 ], CH 3 SC 6 H 4 SH and H 2 0, in THF the products [MoO(CH,SC 6 H 4 S) 2 ] or [MOC1 2 (CH 3 SC 6 H 4 S) 2 ] are formed. In the analogous reaction between [MOC1 4 (THF) 2 ] and the pentadentate ligand 2,3,11,12-dibenzo-1,4,7,10,13-pentathiatridecane (dpttd-H 2) in THF/H 2 0. [MoO(dpttd)] is obtained exclusively. Due to their poor solubility, the Mo(IV)-oxo complexes show only limited reactivity only; with NO reductive nitrosylation to c«-Mo(NO) 2 complexes is observed. 
  Reference    Z. Naturforsch. 40b, 368—372 (1985); eingegangen am 30. November 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0368 
 Volume    40 
66Author    Lothar WeberRequires cookie*
 Title    Übergangsmetall-Schwefelylid-Komplexe, XXII [1] Zur Reaktivität von DicarbonylnitrosyI-f/ 5 -thiacyclohexadienyl-l-oxid- Chromkomplexen gegenüber Phosphor-und Schwefelyliden Transition Metal Sulfur Ylide Complexes, XXII [1] Reactivity Studies of Dicarbonylnitrosyl-^-thiacyclohexadienyl-l-oxide Chromium Complexes with Phosphorus and Sulfur Ylides  
 Abstract    ?? 5 -Thiacyclohexadienyl-l-oxide chromium complexes 3a—d are generated by treatment of the 1-methyl-thiabenzene-l-oxide complexes la—d with Li[BHEt 3 ] and successive nitrosylation of the intermediates 2a—d. 3a—d react with Me 2 S(0) = CH 2 or Ph 3 P=CH 2 at a carbonyl ligand in an additon/transylidation process to yield the very sensitive products 5, 6a—d. 
  Reference    Z. Naturforsch. 40b, 373—379 (1985); eingegangen am 12. Oktober 1984 
  Published    1985 
  Keywords    Reactivity, ?; 5 -Thiacyclohexadienyl-l-oxide Complexes, Sulfur Ylides, Transylidation 
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 Identifier    ZNB-1985-40b-0373 
 Volume    40 
67Author    Dieter Sellmann, Lothar ZapfRequires cookie*
 Title    Übergangsmetallkomplexe mit Schwefelliganden, XIII* Synthesen und Reaktionen der 1,2-Benzoldithiolatomolybdat-Komplexe  
 Abstract    MO(C 6 H 4 S 2) 3 ]"" (Jn = 0, 1, 2) und des Hydrid-Komplexes [Mo(H)(C 6 H 4 S 2) 3 ] 3 " Transition Metal Complexes with Sulfur Ligands, XIII* Syntheses and Reactions of the 1,2-Benzenedithiolato Molybdate Complexes [MO(C6H4S2)3]"-(n = 0, 1, 2) and the Hydride Complex [Mo(H)(C 6 H 4 S 2) 3 ] 3_ 1,2-Benzenedithiolato Molybdate Complexes, Hydride Derivative Modes of formation as well as redox and substitution reactions of the 1,2-benzenedithiolate complexes [Mo(C 6 H 4 S,) 3 ]"" (n = 0, 1, 2, (3)) are described. [MOC14(THF) 2 ] with neutral C 6 H 4 (SH) 2 gives the Mo(VI) complex [MO(C 6 H4S 2) 3 ]; with C6H4S2 2 ~, however, the Mo(IV) com-plex [MO(C6H4S^) 3 ] 2 ~ can be isolated as the PPh 4 + or NR 4 + salt; in the course of the synthesis of (NMe 4) 2 [Mo(C 6 H 4 S 2) 3 ] in MeOH/THF. the complex salt /ra«s-(NMe 4) 2 [Mo(C 6 H 4 S 2) 2 (OCH 3) 2 ] is also obtained. Directly and controlled by pH, [Mo(VI)(C 6 H 4 S 2) 3 ] can be reduced by NaOH/MeOH to afford [Mo(V)(C 6 H 4 S,) 3 ]" or [Mo(IV)(C 6 H 4 S 2) 3 ] 2 ". [Mo(VI)(C 6 H 4 S 2) 3 ] and (NMe 4) 2 [Mo(IV)(C 6 H 4 S 2) 3 ] symproportionate in MeOH to yield (NMe 4)[Mo(V)(C 6 H 4 S 2) 3 ], which was isolated for the first time. When butyllithium reacts with [Mo(VI)(C 6 H 4 S 2) 3 ] in the molar ratio of 1:1, 2:1 or 3:1, one obtains the Mo(V), Mo(IV) dithiolates or an orange complex, respectively. The latter is extremely H 2 0-as well as 0 2 -sensitive; it is identified by its reactions with H 2 0, ROH, 0 2 , alkyl halides and NO as well as by 'H NMR spectroscopy as a salt containing the [MO(H)(C6H4S 2) 3 ] 3 " anion. [Mo(H)(C 6 H 4 S 2) 3 ] 3 ~ is the first example of an exclusively sulfur coordi-nated metal hydride complex. With NO it reacts in several steps yielding first N 2 0 and [Mo(IV)(C 6 H 4 S 2) 3 ] 2 ~; subsequently the Mo(IV) complex is reductively nitrosylated by further NO yielding ds-[Mo(NO) 2 (C 6 H 4 S 2) 2 ] 2 ~, which is isolated as NMe 4 + salt. 
  Reference    Z. Naturforsch. 40b, 380—388 (1985); eingegangen am 13. Dezember 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0380 
 Volume    40 
68Author    Jacek Bielawski, Kurt Niedenzu, JeanS. StewartRequires cookie*
 Title    Preparation and Characterization of Some Isoelectronic Boron-Nitrogen Analogs of Substituted Uracil [1]  
 Abstract    Several l,3,5-triaza-2-boracyclohexa-4,6-diones, which are isoelectronic analogs of substituted uracil, have been prepared by condensation reactions of boranes with biurets. They include species containing a NH or BH unit as potentially reactive sites. The latter are extremely sensitive to hydrolysis but are readily handled as the 2-methylaminoethanol derivative containing four-coordinate boron. 
  Reference    Z. Naturforsch. 40b, 389—392 (1985); received November 18 1984 
  Published    1985 
  Keywords    Boron-Nitrogen Compounds, Azaborauracils, l, 3, 5-Triaza-2-boracyclohexa-4, 6-diones, Spiroboron Compound, NMR Spectra 
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 Identifier    ZNB-1985-40b-0389 
 Volume    40 
69Author    Jan Runsink, Lothar MeierRequires cookie*
 Title    Correction of Structure Determinations on Monomethyl-Substituted 2-(ChloromethyI)-l,4-dioxaspiro[4.5]decanes, 2-Methylene-l,4-dioxa- spiro[4.5]decanes, l-(l'-Cyclohexene-l'-yloxy)-2-propanes and rac-4,5,6,7-Tetrahydro-3-methyI-l-benzofurans  
 Abstract    Spirodioxolanes, syn/am/'-Isomerism, /3-Oxa-y,6-enones, Menthofuranisomers, 13 C NMR Spectra The structures of the entitled compounds, synthesized as mixtures up to four isomers, are determined by the means of 13 C NMR spectroscopy. Our previous assignment [2] of the syn/anti-isomers of the monomethyl-substituted 2-(chloromethyl)-l,4-dioxaspiro[4.5]decanes are re-versed. Wrong assignments made in literature [3, 4] are corrected. 
  Reference    Z. Naturforsch. 40b, 393—397 (1985); received September 17 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0393 
 Volume    40 
70Author    Detlef Geffken, Knuth Strohauer, Meinem Verehrten Lehrer, Herrn Prof, G. Dr, ZinnerRequires cookie*
 Title    3-Substituierte l-AIkoxyindolin-2-one aus N-Alkoxy-2-phenylgIycoIamiden und Dicyclohexylcarbodiimid 3-Substituted l-Alkoxyindolin-2-ones from N-Alkoxy-2-phenylglycolamides and Dicyclohexylcarbodiimide  
  Reference    Z. Naturforsch. 40b, 398—401 (1985); eingegangen am 15. August 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0398 
 Volume    40 
71Author    HansAlbert Brune, Peter LachRequires cookie*
 Title    Eine Untersuchung über die Energie-Übertragung bei der triplett-sensibilisierten Photo-Isomerisierung der 6-endo-und 6-ero-alkylsubstituierten Tetramethylhomofulvene An Energy Transfer Study of the Triplet Sensitized Photo-Isomerizations of 6-endo-and 6-exo-Alkyl-Substituted Tetramethylhomofulvenes  
 Abstract    The isomerizations following triplet sensitized excitations of three diastereomeric pairs of 6-endo-and 6-exo-alkyl substituted l,2,3,5-Tetramethyl-4-methylenebicyclo[3.1.0]hex-2-enes have been studied with respect to the influence of the steric conditions during triplet energy transfer on the equilibrium constant of the photo-stationary equilibrium. 
  Reference    Z. Naturforsch. 40b, 402—406 (1985); eingegangen am 20. Oktober 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0402 
 Volume    40 
72Author    AndrzejE. WróblewskiRequires cookie*
 Title    Synthesis of Substituted 3-(/J,ß-Dimethylhydrazino)- 2-methoxy-2-oxo-l,2-oxaphospholanes +  
 Abstract    3-(/?,/3-Dimethylhydrazino)-l,2-oxaphospholanes, Diastereoselectivity, Configuration, Mechanism, Equilibration Cyclisation of d-(N.N-dimethylhydrazono)alkyl phosphites afforded the title compounds in moderate to high yields. The ring closure was highly diastereoselective leading to an excess of the diastereomers with the /3,/3-dimethylhydrazino and MeOP groups in the trans configuration. The structure and relative configurations of diastereomeric pairs were established by 'H and 13 C NMR spectroscopy. A mechanism of cyclisation was proposed. 
  Reference    Z. Naturforsch. 40b, 407—415 (1985); received November 5 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0407 
 Volume    40 
73Author    Wolfgang Sucrow, Ronald Lüschen, Annette RisseRequires cookie*
 Title    Aliphatische Flüssigkristalle, IV [1] Synthese einiger l-(l,3-Dioxan-2-und -5-yl)piperidine Aliphatic Liquid Crystals, IV [1] Synthesis of Some l-(1.3-Dioxan-2-and -5-yl)Piperidines  
 Abstract    4-Pentylpiperidine. frans-4-Pentyl-l-(c/s-and frarts-2-pentyl-l,3-dioxan-5-yl)piperidines. Liquid Crystal, Smectic B Phase 
  Reference    Z. Naturforsch. 40b, 416—421 (1985); eingegangen am 5. Oktober 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0416 
 Volume    40 
74Author    Joachim Thiem, Hans-Peter Wessel, Pharmazeutische Forschungsabteilung, F. Hoffmann, Laroche, Co Ag, PfRequires cookie*
 Title    Synthesen von Emodinaldehyd [1] Synthesis of Emodine Aldehyde [1]  
 Abstract    By chromium trioxide oxidation and subsequent acid hydrolysis triacetyl emodine (3) was transferred to the aldehyde 9 in a two-step synthesis. In a more favourable sequence 3 was reacted to the bromomethyl derivative 4 and this solvolyzed to the citreoroseine derivative 5. A second NBS reaction gave 8 which after acid hydrolysis led to emodine aldehyde (9). This five-step process proceeded without chromatographic separation in 27% overall yield. 
  Reference    Z. Naturforsch. 40b, 422—425 (1985); eingegangen am 15. August 1984 
  Published    1985 
  Keywords    Emodine, Citreoroseine, 3-Formyl-l, 6, 8-trihydroxyanthraquinone, 'H NMR Spectra 
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 Identifier    ZNB-1985-40b-0422 
 Volume    40 
75Author    Hans Achenbach, Andreas Mühlenfeld, Dieter HunklerRequires cookie*
 Title    Stoffwechselprodukte von Mikroorganismen, XXIX [1] C-NMR-Spektren hochsubstituierter Naturstoffe vom Phthalid-Typ Investigations on Metabolites of Microorganisms, XXIX [1] 13 C NMR Spectra of Highly Substituted Natural Products of the Phthalide Type  
 Abstract    Since the usual 13 C shift increments are not applicable for very highly substituted benzenes, the 13 C NMR spectra of 3-O-ethyl-cyclopolic acid (1) and 2 were studied and fully analyzed. These results were essential for the structure elucidation of a number of new highly substituted phthalides recently isolated from cultures of Aspergillus duricaulis [3], 
  Reference    Z. Naturforsch. 40b, 426—428 (1985); eingegangen am 12. Oktober 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0426 
 Volume    40 
76Author    Richard Neidlein, UdoJ. Klotz, Herrn Kollegen, Hans Musso, KarlsruheRequires cookie*
 Title    Substitutionsreaktionen an 3,7-Dialkoxy- and of its Derivatives — Synthetic Research with Electron-Rich Olefins and Nucleophiles  
 Abstract    4H,8H-benzol(l,2-c:4,5-c')diisoxazoI-4,8-dionen und ihren Derivaten — synthetische Untersuchungen mit elektronenreichen Olefinen und anderen Nukleophilen Substitution-Reactions at 3,7-Dialkoxy-4H,8H-benzol(l,2-c:4,5-c')diisoxazole-4,8-diones 3,7-Diethoxy-4H,8H-benzo(l,2-c:4,5-c')diisoxazole-4,8-dione, 3,7-Bis-[(2,2-bis-dimethylamino)ethenyl]-4H,8H-benzo(l,2-c:4,5-c')diisoxazol-4,8-dione, 3,6-Dioxo-l,4-cyclohexadiene-l,4-dicarbonic-acid-amides, Synthesis, Spectroscopic Properties The syntheses of the compounds 3, 5, 8a—8d, 10 and 12a—12d by substitution-reactions, the different spectroscopic results are reported in detail. 
  Reference    Z. Naturforsch. 40b, 429—433 (1985); eingegangen am 27. August 1984 
  Published    1985 
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 Identifier    ZNB-1985-40b-0429 
 Volume    40 
77Author    Hans Möhrle, Hans-Jörg HemmerlingRequires cookie*
 Title    Kondensierte Imidazolone Condensed Imidazolones  
 Abstract    The dehydrogenation of 2-rerr-amino-2,2-diphenyl-acetamides with cyclic amine components gives under neighbouring the corresponding condensed imidazolones 11—13. With analogous reactions of 2-terr-amino-2-phenylacetamides on dependence of the ring size of the amine cycle, a different course is observed resulting in the cyclic acylaminal 14 or in the condensed imidazolone derivatives 15 and 16. 
  Reference    Z. Naturforsch. 40b, 434—440 (1985); eingegangen am 14. September 1984 
  Published    1985 
  Keywords    Condensed Imidazolones, Mercuric EDTA, Dehydrogenation, Neighbour Group Effect 
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 Identifier    ZNB-1985-40b-0434 
 Volume    40 
78Author    HelmutG. AltRequires cookie*
 Title      
 Abstract    The complexation of cyclohexanedioxydiacet-amides by K + cations may be studied by J H and 13 C NMR spectroscopy. 
  Reference    Z. Naturforsch. 40b, 441—442 (1985); received October 29 1984 
  Published    1985 
  Keywords    Noncyclic, Ionophors, Complexation of K + Cations, 'H NMR Spectra, I3 C NMR Spectra 
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 Identifier    ZNB-1985-40b-0441_n 
 Volume    40 
79Author    Udo Demant, Elke Conradi, Ulrich Müller, Kurt DehnickeRequires cookie*
 Title    Formamidinhim-Hexachloroferrat(III) Synthese und Kristallstruktur Formamidinium-Hexachloroferrate(III) Synthesis and Crystal Structure  
 Abstract    [HC(NH 2) 2 ] 3 FeCl 6 was obtained together with other products from the reaction of S 4 N 4 with HCl in H 2 CC1 2 in the presence of FeCl 3 . Its crystal structure was determined from X-ray diffraction data (473 in-dependent observed reflexions, R = 0.047). Lattice constants: a = 961.6, c — 876.4 pm; tetragonal, space group P4 2 /m, Z = 2. Of the two crystallo-graphically independent formamidinium ions HC(NH 2) 2 ®, one exhibits positional disorder; the other one has C—N bond lengths of 128 pm. The FeCl 6 30 ions have symmetry C 2h , but the deviation from O h is small. 
  Reference    Z. Naturforsch. 40b, 443—445 (1985); eingegangen am 6. November 1984 
  Published    1985 
  Keywords    Formamidinium-Hexachloroferrate(III), Synthesis, IR Spectra, Crystal Structure 
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 Identifier    ZNB-1985-40b-0443_n 
 Volume    40 
80Author    Tetrameric, Hartmut Köpf, Thomas KlapötkeRequires cookie*
 Title    Ein tetrameres Zirconocen und seine Spaltung zu Chloro-bis(f7 5 -cycIopentadienyl)-trimethylsilyI-zirkonium(IV) oder Bis[bis(f7 5 -cycIopentadienyl)-trimethylstannyl-zirkonium(III)]  
 Abstract    Zirconocene and its Cleavage to Chloro-bis(?; 5 -cyclopentadienyl)-trimethylsilyl-zirconium(IV) or Bis[bis(?7 :, -cyclopentadienyl)-trimethylstannyl-zirconium(III)] Zirconocene, Chloro-bis(?7 5 -cyclopentadienyl)-trimethylsilyl-zirconium(IV), Bis[bis(/7 :, -cyclopentadienyl)-trimethylstannyl-zirconium(III)] A tetrameric zirconocene, [Cp 2 Zr] 4 , was prepared by reducing Cp 2 ZrH 2 with red or white phosphorus, with grey arsenic or with antimony in toluene. The tetramer reacts with adequate amounts of Me 3 SiCl to give Cp 2 Zr(SiMe 3)Cl, but with Me 3 SnCl to give [Cp 2 Zr(SnMe 3)] 2 , Cp 2 ZrCl 2 , and Sn 2 Me 6 . Reaction with Ph 2 PCl yields Cp 2 ZrCl 2 and P 2 Ph 4 . 
  Reference    Z. Naturforsch. 40b, 447—449 (1985); eingegangen am 13. November 1984/21. Januar 1985 
  Published    1985 
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 Identifier    ZNB-1985-40b-0447 
 Volume    40 
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