Published by De Gruyter

Volume 32 Issue 7

Issue of Zeitschrift für Naturforschung B

Contents
Journal Overview

Open Access June 2, 2014

Hydrat und Thiohydrat des Propinals / Hydrate and Thiohydrate of Propynal

Franz Wille, Walter Schwab

Page range: 729-732

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Abstract

Propynal (2 a) reacts with water at temperatures of about —18 °C to give a single crystallized hydrate 1 a with the structure [xxx]. It decomposes at higher temperature into 2 a and water. No other hydrates of 2 a could be found. An analogous compound lb is obtained with H 2 S at about the same temperature. At room temperature it decomposes into H 2 S and 2 a, at higher temperatures into 3,3'-thiodiacroleine (6 a).

Open Access June 2, 2014

Malondialdehyde aus Propinai / Malonaldehydes from Propynal

Franz Wille, Walter Schwab

Page range: 733-740

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Abstract

Malonaldehyde (2 a) is possibly an intermediate in the reaction of propynal (1) with itself, which ends up in 3-ethinyl-2,4-diformyl-pentanedial (6 a), a compound containing two malonaldehyde groups bridged by a substituted methylene group. The alkali salts of the unstable 1-thiomalonaldehyde (7 a) are obtained from 3,3′-thiodiacroleine (8 a) or S-acroleinyl-diphenylthiourea (8 b) and alkalisulfide or ammonia. 2-Chloro, 2-bromo- and 2-iodo-malonaldehyde (14 a-c) are prepared from 1 via 2,3-dihalogenpropenals (12).

Open Access June 2, 2014

Die Kristallstruktur des Silbertetrachloroaurats(III) AgAuCl₄ und seine kristallchemische Verwandtschaft zum Rubidiumtetrachloroaurat(III) RbAuCl₄ / The Crystal Structure of Silver Tetrachloroaurate(III) AgAuCl₄ and its Crystal Chemical Relationship to the Rubidium Tetrachloroaurate(III) RbAuCl₄

Walther Werner, Joachim Strähle

Page range: 741-744

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Abstract

AgAuCl 4 crystallizes in the monoclinic space group I2/c with Zi = 4. The crystal structure is built up by Ag + cations and square planar AuCl 4⁻ anions with Au-Cl bond length of 228 pm. The Ag + ions have an octahedral coordination of Cl atoms. AgAuCl 4 is topologically related to RbAuCl 4 .

Open Access June 2, 2014

Darstellung und Kristallstruktur von Na₂CuP, K₂AgAs, K₂AgSb und K₂AgBi / Preparation and Crystal Structure of Na₂CuP, K₂AgAs, K₂AgSb, and K₂AgBi

Gerhard Savelsberg, Herbert Schäfer

Page range: 745-748

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Abstract

The title compounds have been prepared and structurally characterized. Na 2 CuP crystallizes in the Na 2 CuAs-structure type/(Cmcm) forming infinite Cu—P-zigzag-chains. In the silver compounds we found analogous Ag—E(V)-chains in a cell with atomic positions, which slightly violate the above symmetry.

Open Access June 2, 2014

LiFe₆Ge₅ und LiFe₆Ge₄ Zwei Phasen mit enger Strukturbeziehung zu der Verbindung LiFe₆Ge₆ / LiFe₆Ge₅ and LiFe₆Ge₄ Two Phases with Close Structure Relations to the Compound LiFe₆Ge₆

Erwin Welk, Hans-Uwe Schuster

Page range: 749-752

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Abstract

The phases LiFe 6 Ge 5 and LiFe 6 Ge 4 have been prepared and structurally characterized. They crystallize monoclinic (LiFe 6 Ge 5 : a = 8.74 4 Å, b = 5.04 5 Å, c = 14.84 1 Å, β = 101.42°; LiFe 6 Ge 4 : a = 8.73 9 Å, b = 5.04 5 Å, c = 7.17 0 Å, β = 113.94°; space group C 2/m), their structures show close relations to the structure of LiFe 6 Ge 6 and binary iron-germanium-phases.

Open Access June 2, 2014

AB₂X₂-Verbindungen im CaAl₂Si₂-Typ, III Zur Struktur der Verbindungen CaZn₂P₂, CaCd₂P₂, CaZn₂As₂ und CaCd₂As₂ / AB₂X₂ Compounds with the CaAl₂Si₂ Structure, III The Crystal Structure of CaZn₂P₂, CaCd₂P₂, CaZn₂As₂, and CaCd₂As₂

Peter Klüfers, Albrecht Mewis

Page range: 753-756

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Abstract

As confirmed by X-ray data, the four ternary compounds CaZn 2 P 2 , CaCd 2 P 2 , CaZn 2 As 2 , and CaCd 2 As 2 crystallize trigonally in a CaAl 2 Si 2 -type structure. Some conditions for the existence of this structure type are given.

Open Access June 2, 2014

Tri(tert-butyl)methylenphosphoran : Konsequenzen sterischer Hinderung für innermolekulare Beweglichkeit und thermischen Zerfallsmechanismus / Tri(tert-butyl)methylenephosphorane : Consequences of Sterical Hindrance for Intramolecular Motions and Thermal Decomposition Mechanism

Hubert Schmidbaur, Günter Blaschke, Frank H. Köhler

Page range: 757-761

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Abstract

Dimethyl(tert-butyl)-, di(tert-butyl)methyl- and tri(tert-butyl)methylenephosphorane (CH 3 ) n [(CH 3 ) 3 C] 3-n P=CH 2 , 3a-c, (n = 2,1, 0) have been synthesized from the corresponding phosphonium bromides, using standard methods, but under mild conditions. 3 c was found to be thermally unstable, undergoing reductive elimination of isobutene already at room temperature, with di(tert-butyl)methylphosphine as a by-product. 3 b is decomposed similarly above 80 °C. A mechanism for this unusual mode of ylide decomposition is proposed, based on the extreme steric crowding of the molecules. Restricted P–C bond rotation has been detected by 1 H and 13 C NMR spectroscopy for 3 c in toluene solution. Traces of protic species cause a rapid intermolecular H 2 C(P) hydrogen exchange.

Open Access June 2, 2014

Funktionelle Trimethylphosphinderivate, VI¹ Lithium-dimethylphosphinomethanid, (CH₃)₂PCH₂Li, Tetraorganodiphosphinomethane, R₂PCH₂P(CH₃)₂ und Tris(dimethylphosphinomethyl)phosphin, P[CH₂P(CH₃)₂]₃ Functional Derivatives of Trimethylphosphine, VI¹ / Lithium-dimethylphosphinomethanide, (CH₃)₂PCH₂Li, Tetraorganodiphosphinomethanes, R₂PCH₂P(CH₃)₂, and Tris(dimethylphosphinomethyl)phosphine, P[CH₂P(CH₃)₂]₃

Hans H. Karsch, Hubert Schmidbaur

Page range: 762-767

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Abstract

Dialkylmethylphosphines R 2 PCH 3 are metallated by tert-C 4 H 9 Li to give LiCH 2 PR 2 (la: R = CH 3 , lb: R. = tert-C 4 H 9 ). la introduces the e CH 2 P(CH 3 ) 2 -ligand into L 3 CoCl to give [xxx] (2). With diorganochlorophosphines R 2 PCl (R = CH 3 , tert-C 4 H 9 , C 6 H 5 ) and with triphenylphosphite P(O Ø) 3 the new biphosphinomethane derivatives (CH 3 ) 2 PCH 2 PR 2 (4 a-c) and P[CH 2 P(CH 3 ) 2 ] 3 (5) are formed, resp.. Tetramethyldiphosphinomethane (3 a) is also obtained from (CH 3 ) 2 PCl and Li 2 CH 2 . Some properties and spectroscopic data of these new materials are described.

Open Access June 2, 2014

NMR-Untersuchungen an Organoelement(IVb)-phosphinen, III¹ Phosphor-Wolfram-Kopplungskonstanten in Pentacarbonyl-trimethylelement(IVb)-phosphin-Wolfram-Komplexen / NMR-Studies on Organoelement(IV b)-phosphines, III¹ Phosphorus-Tungsten Coupling Constants in Pentacarbonyl-trimethylelement(IVb)-phosphine Tungsten Complexes

Herbert Schumann, Heinz-Jürgen Kroth

Page range: 768-770

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Abstract

Nuclear spin-spin coupling constants 1 J( 31 P- 183 W) are reported of trimethyl element (IVb)-phosphine substituted pentacarbonyl-tungsten complexes of the type [(CH 3 ) 3 E] n PR 3-n W(CO)5 (E = C, Si, Ge, Sn; R = t C 4 H 9 , C 6 H 5 ; n = 0, 1, 2, 3). Variations in the size of coupling constants are shown to depend mainly on the different ligand electronegativities.

Open Access June 2, 2014

A Study of Vanadium-51 Shielding in VO³⁺ Compounds

Dieter Rehder

Page range: 771-775

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Abstract

Vanadium-51 NMR chemical shifts δ V for a variety of VO 3+ compounds have been found to range from —432 ppm (liquid VOBr 3 ) to + 786 ppm (VOF 3 /CH 3 CN) relative to a liquid VOCl 3 standard. The δ V values and hence the shieldings of the vanadium nucleus are shown to increase in the order VOBr 3 ≪ VOCl 3 < VO(NEt 2 ) 3 < VO(OR) 3 < VOF 3 (1); VOCl 3 < VOCl 2 (OEt) < VOCl(acac) 2 < VOCl(OEt) 2 < VO(OEt) 3 (2); VOCl 2 (OMe) < VOCl 2 (OEt) < VOCl 2 (OPri) < VOCl 2 (OBu t ) (3); VO(OEt) 3 < VO(OBu n ) 3 < VO(OPr n ) 3 ≲ VO(OBu i ) 3 < VO(OPr i ) 3 (4). These trends are elucidated by considering the energy separation between highest occupied and lowest unoccupied molecular orbitals (1,2), inductive and π-transmittance of electron density (1, 2), and hindered σ-donation and expansion of the coordination sphere due to ligand bulkiness (3, 4). High solvent shifts in THF solution suggest complete or partial removal of the halogen from the VO 3+ moiety for VOBr 3 and VOCl 2 (OBu t ). For other compounds, solvent shifts of approximately 30 ppm are likely caused by solvation effects. In the case of VOCl 3 , an equilibrium between solvated VOCl 3 and a species containing THF molecules directly bonded to VO 3+ is proposed. VOCl 3 · 2 RCN (R = Me, Ph) in THF show intact VOCl 3 units : solvent-solute interaction is restricted to the second coordination sphere.

Open Access June 2, 2014

Anionenaktivierung, V / Anion Activation, V

Charakterisierung des anionenaktivierenden Verhaltens makrozyklischer Polyether im Verlauf nukleophiler Substitutionsreaktionen bei homogener Reaktionsführung / Characterisation of Anion Activation by Macrocyclic Polyethers during Nucleophilic Substitutions under Homogeneous Conditions

W. L. Dorn, A. Knöchel, J. Oehler, G. Rudolph

Page range: 776-782

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Abstract

The rate constants of the reaction between benzyl chloride and acetate ion, generated from several alkali acetates and a series of macrocyclic polyethers, were measured under equal conditions. It appears that aminopolyethers are superior to crown ethers in rate acceleration. This behaviour is correlated to the amount of ion-pair separation by certain macrocyclic polyethers, as detected by 1 H NMR spectroscopy, which is a simple method to evaluate the anion activation of every ligand/cation-combination.

Open Access June 2, 2014

Anionenaktivierung, VI¹ Charakterisierung des anionenaktivierenden Verhaltens makrozyklischer Polyether im Verlauf nukleophiler Substitutionsreaktionen mit heterogener Reaktionsführung / Anion Activation, VI Characterisation of Anion Activation by Macrocyclic Polyethers during Nucleophilic Substitutions under Heterogeneous Conditions

A. Knöchel, J. Oehler, G. Rudolph

Page range: 783-786

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Abstract

The reaction between benzyl chloride and acetate ion, generated from several alkali acetates and a series of macrocyclic polyethers was carried out under similar, heterogeneous solid/liquid phase-transfer conditions. The ability of anion activation of several important polyether ligands is compared. The differences of reactivity among the macrocyclic polyethers in the presence of the same cation are reported. Each ligand can be combined with one certain alkali cation to generate the most reactive species. A model of anion activation under phase-transfer condition is discussed.

Open Access June 2, 2014

Chromchalkogenide, IX¹ Ternare Sulfide der Systeme Calcium—Chrom—Schwefel, Strontium—Chrom—Schwefel und Barium—Chrom—Schwefel / Chromium Chalcogenides, IX¹ Ternary Sulfides of the Systems Calcium Chromium Sulfur, Strontium Chromium Sulfur, and Barium Chromium Sulfur

Heinz Dieter Lutz, Rolf-Armin Becker

Page range: 787-789

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Abstract

As the first ternary calcium chromium sulfide Ca 0,29 Cr 0,48 S was synthesized by firing of stoichiometric mixtures of CaS and Cr 2 S 3 at 950 °C. From strontium and barium only the well-known compounds SrCr 2 S 4 and BaCr 2 S 4 could be obtained. The best methods of preparation for these compounds are the reactions of SrCrO 4 or BaCO 3 and Cr 2 S 3 resp. with H 2 S/H 2 at 950 °C. Whisker-like single crystals of BaCr 2 S 4 are formed by heating of crude BaCr 2 S 4 with AICl 3 . X-ray and IR data of the ternary chromium sulfides are given.

Open Access June 2, 2014

Aktive Zentren in CaNaX und NiNaX-Zeolithen / Active Sites in CaNaX and NiNaX Zeolites

Johannes Latzel, Heinrich Noller

Page range: 790-794

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Abstract

Temperature programmed desorption of pyridine and benzene was carried out on NaX-13, CaNaX and NiNaX. This was correlated with IR investigation of pyridine adsorption according to WARD 3 and with microcatalytic investigations of 2-butanol dehydration and butene isomerisation. Pyridine showed three definite desorption maxima for each of the three zeolites. While the catalytically inactive NaX-13 desorbed pyridine up to 385 °C, the comparable desorption maxima of the active CaNaX and NiNaX were situated at 490 and 470 °C, respectively. IR investigations showed zeolitic cations for these adsorption centres (bands at 1443-1444,1443-1445,1447-1448 cm -1 ). The lower desorption temperature of the system pyridine/NiNaX, compared with CaNaX, is incompatible with the higher acidity of Ni 2+ and the higher IR band level, while the desorption temperature on NaX-13 and CaNaX is conform with the acidity of the ions and the IR band. Benzene on NiNaX behaves in the same way as on NaX-13 (highest desorption temperature 160 °C) while a desorption peak still occurs at 375 °C on CaNaX. The special case of NiNaX is explained by migration of the Ni 2+ into the sodalite cave.

Open Access June 2, 2014

Synthese und Eigenschaften von Rhenium-Komplexen mit N₂-, N₂H₂-, N₂H₄- und NH₃-Liganden / Synthesis and Properties of Rhenium Complexes with N₂, N₂H₂, N₂H₄ and NH₃ Ligands

D. Sellmann, E. Kleinschmidt

Page range: 795-801

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Abstract

UV irradiation of C 5 H 5 Re(CO) 3 in tetrahydrofuran (THF) yields the THF complex C 5 H 5 Re(CO) 2 THF and traces of [(C 5 H 5 ) 2 Re 2 (CO) 5 ]. C 5 H 5 Re(CO) 2 THF is stable at room temperature, its reaction with N 2 /100 bar yields C 5 H 5 Re(CO) 2 N 2 , which also forms in the reaction with N 2 O whereby the THF complex is partially oxidized and decomposed. The reaction with an excess of N 2 H 4 yields C 5 H 5 Re(CO) 2 N 2 H 4 , the oxidation of which leads to C 5 H 5 Re(CO) 2 N 2 and the by-product trans-N 2 H 2 [C 5 H 5 Re(CO) 2 ] 2 , in which the under ambient conditions unstable HN=NH molecule could be stabilized in a rhenium complex for the first time. In contrast to the analogous manganese complex C 5 H 5 Re(CO) 2 N 2 H 4 disproportionates easily to C 5 H 5 Re(CO) 2 N 2 and C 5 H 5 Re(CO) 2 NH 3 at room temperature; the NH 3 complex can be synthesized directly only by irradiating C 5 H 5 Re(CO) 3 in hexane in the presence of NH 3 . The complexes are characterized spectroscopically and by elemental analyses; the different electronic influence of the nitrogen ligands on the C 5 H 5 Re(CO) 2 system is discussed.

Open Access June 2, 2014

Übergangsmetall-Carbin-Komplexe, XXXIII¹ Thermische Abspaltung von Carbinliganden aus trans-Bromotetracarbonyl(organylcarbin)chrom-Komplexen / Transition Metal Carbyne Complexes, XXXIII¹ Thermal Cleavage of Carbyne Ligands from trans-Bromotetracarbonyl(organylcarbyne)chromium Complexes

Ernst Otto Fischer, Alexander Ruhs, Dieter Plabst

Page range: 802-804

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Abstract

trans-Bromotetracarbonyl(phenyl- or -methylcarbyne)chromium react at elevated temperatures to yield tolane and dimethylacetylene, respectively. On warming trans-bromo-tetracarbonyl(phenyl- and -p-tolylcarbyne)chromium phenyl-p-tolylacetylene is formed as well as both the symmetrical alkynes tolane and di-p-tolylacetylene.

Open Access June 2, 2014

Kurzzeitpyrolyse, VI Ringverengungen durch CO-Eliminierung aus cyclischen Carbonylverbindungen / Short Time Pyrolysis, VI Ring Contractions by CO-Elimination from Cyclic Carbonyl Compounds

Gerhard Schaden

Page range: 805-806

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Abstract

An one-step synthesis of benzocyclobutene (2) by gas-phase pyrolysis of indane-2-one (1) has been found. By the same method indane-1-one (3) and naphthoquinone(1,4) (5) gave indene-1 -one (4) and fluorene-9-one (7) formed biphenylene (8).

Open Access June 2, 2014

Zum Mechanismus der Hydrolyse des Adenosin-3′.5′-cyclophosphatbenzylesters / On the Mechanism of Adenosine-3′,5′-cyclophosphatebenzylester Hydrolysis

Joachim Engels

Page range: 807-809

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Abstract

The hydrolysis of benzyltriesters of adenosine 3′,5′-cyclophosphate with H 2 18 O was undertaken. The mass spectra of the benzylalcohol fragments contained the label whereas the cAMP after derivatisation with trimethylsilyl-groups did not show an enhanced M + 2 peak. This clearly indicates that the benzylic C–O bond is broken during hydrolysis.

Open Access June 2, 2014

Correlations between the Stereochemistry and the Chemical Ionization Spectra of Epimeric 3,4-Dimethyl-1,2-cyclopentanediols

C. C. Van De Sande, F. Van Gaever, R. Hanselaer, M. Vandewalle

Page range: 810-817

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Abstract

The eight epimeric 3,4-dimethyl-l,2-cyclopentanediols have been investigated as bistrimethylsilyl (TMS) ethers and as diacetates by means of isobutane chemical ionization (CI). Correlations between stereochemistry and CI spectra appear to be limited in the case of the TMS ethers. All eight diacetates, however, can be unequivocally identified from their isobutane CI spectra.

Open Access June 2, 2014

Nuclear Magnetic Resonance Studies on Aromatic Compounds, IV ¹³C NMR Spectra of Some Disulpho-substituted 1- and 2-Naphthols

Kauko Räisänen, Lauri H. J. Lajunen

Page range: 818-820

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Abstract

The 13 C NMR spectra of 1-hydroxynaphthalene-3,6-disulphonic, 1-hydroxynaphthalene- 3,8-disulphonic, 2-hydroxynaphthalene-3,6-disulphonic, and 2-hydroxynaphthalene-6,8-disulphonic acids were determined with and without noise-decoupling. The fine splitting caused by the long-range couplings pattern was used in the identification of the resonances lines of the 13 C nuclei. The combined influence of the mesomeric effect of the hydroxyl group and that of the sulphonate groups have been discussed.

Open Access June 2, 2014

Heterocyclic Compounds Synthesis of 7,14-Diacetyl-3,10-diethoxy-6,13-dihalo-triphenodithiazine and Derivatives

Surendra Kumar Jain, R. L. Mital

Page range: 821-825

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Abstract

7,14-Diacetyl-6,13-dihalo-3,10-diethoxytriphenodithiazines have been synthesised by reductive acetylation of 6,13-dihalo-3,10-diethoxytriphenodithiazine with Zn dust (Ac 2 O) pyridine. Attempts to synthesis 7,14-dihydro-6,13-dihalo-3,10-diethoxytriphenodithiazine is failed. Oxidation with 30% H 2 O 2 in AcOH of 7,14-diacetyl-6,13-dihalo-3,10-diethoxytriphenodithiazine did not produce its S,S-dioxide. 3-Acetoxy-7-ethoxy-1,2,4-trihalophenothiazine on treatment with 30% H 2 O 2 in AcOH regenerated 7-ethoxy-1,2,4-trihalo-3H-phenothiazine-3-one by oxidative deacetylation. Their R i values and IR spectral data have been recorded.

Open Access June 2, 2014

Formose-Reaktion, I Kinetik und Mechanismus der Sekundärreaktionen bei Anwesenheit von Formaldehyd / Formose Reaction, I Kinetics and Mechanism of the Secondary Reaction Step in the Presence of Formaldehyde

Günther Harsch, Wolfgang Voelter, Hermann Bauer

Page range: 826-832

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Abstract

Quantitative kinetic results of the intermediates and end products of the formose reaction are obtained for the first time by the application of high pressure liquid chromatography. A mechanism for the secondary reaction step of the formose reaction in the presence of excess formaldehyde is derived from these results : Formaldehyde adds successively to intermediates and the formation of xylose is highly favoured. All results are characteristic for typical aldol-type reactions. Almost no cleavage of the intermediate and end products is observed.

Open Access June 2, 2014

Notizen: CaFe₆Al₆O₁₉ mit Magnetoplumbitstruktur / CaFe₆Al₆O₁₉ with Magnetoplumbite Structure

M. Harder, Hk. Müller-Buschbaum

Page range: 833-834

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Abstract

Single crystals of the hitherto unknown compound CaFe 6 Al 6 O 19 were examined by X-ray work. It is isotypic with the magnetoplumbite structure (a = 562.8, c = 2208. 4 pm, space group D 6h 4 -P6 3 /mmc). A discussion of the statistical distribution of Fe 3+ and Al 3+ with respect to other compounds of this type is given.

Open Access June 2, 2014

Notizen: Zur Darstellung und Kristallstruktur von Ba₂MnTe₃ / Preparation and Crystal Structure of Ba₂MnTe₃

Peter Matje, Wiking Müller, Herbbert Schäfer

Page range: 835-836

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Abstract

Ba 2 MnTe 3 has been prepared and analytically and structurally characterized. It crystallizes orthorhombic with a = 972(2) pm, b = 473(1) pm, c = 1898(4) pm, Pnma and is isotypic to Ba 2 MnS 3 and Ba 2 MnSe 3 .

Open Access June 2, 2014

Notizen: Structures, Energies, and Reactivities of Bridgehead Olefins

Otto Ermer

Page range: 837-840

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Abstract

Force field calculations of a series of bridgehead olefins give nonplanar double bond deformation energies which are correlated with chemical stability (reactivity) properties. Minimum potential energies allow an interpretation of experimental relative yields of isomeric bridgehead olefins with the same carbon skeleton. Pyramidal distortions (outof-plane bending) at the sp 2-carbon atoms are often found to contribute more prominently to the non-planar double bond deformations than pure twisting. Qualitative rules proposed in the past as to reactivity, thermodynamic stability, and structure of bridgehead olefins do not always agree with the computational results.

About this journal

Objective
Zeitschrift fuer Naturforschung B (ZNB) publishes novel research in all areas of inorganic chemistry, organic chemistry, and analytical chemistry. In particular, the journal focuses on solid state chemistry, coordination chemistry, main group element chemistry, synthetic organic chemistry, natural product chemistry and, to a lesser extent, on analytical chemistry. For more than 65 years Zeitschrift fuer Naturforschung B has been open to contributions from all fields of experimental and theoretical chemistry. Zeitschrift fuer Naturforschung B publishes 12 issues per volume/year. Sometimes double issues occur.

Topics

Solid state chemistry
Coordination chemistry
Main group element chemistry
Organic chemistry
Natural product chemistry

Article formats
Original (full) papers, research notes and preliminary communications, reports on specific research topics of current interest (reviews)

> Information on submission process

Volume 32 Issue 7

Issue of Zeitschrift für Naturforschung B

Hydrat und Thiohydrat des Propinals / Hydrate and Thiohydrate of Propynal

Abstract

Malondialdehyde aus Propinai / Malonaldehydes from Propynal

Abstract

Die Kristallstruktur des Silbertetrachloroaurats(III) AgAuCl4 und seine kristallchemische Verwandtschaft zum Rubidiumtetrachloroaurat(III) RbAuCl4 / The Crystal Structure of Silver Tetrachloroaurate(III) AgAuCl4 and its Crystal Chemical Relationship to the Rubidium Tetrachloroaurate(III) RbAuCl4

Abstract

Darstellung und Kristallstruktur von Na2CuP, K2AgAs, K2AgSb und K2AgBi / Preparation and Crystal Structure of Na2CuP, K2AgAs, K2AgSb, and K2AgBi

Abstract

LiFe6Ge5 und LiFe6Ge4 Zwei Phasen mit enger Strukturbeziehung zu der Verbindung LiFe6Ge6 / LiFe6Ge5 and LiFe6Ge4 Two Phases with Close Structure Relations to the Compound LiFe6Ge6

Abstract

AB2X2-Verbindungen im CaAl2Si2-Typ, III Zur Struktur der Verbindungen CaZn2P2, CaCd2P2, CaZn2As2 und CaCd2As2 / AB2X2 Compounds with the CaAl2Si2 Structure, III The Crystal Structure of CaZn2P2, CaCd2P2, CaZn2As2, and CaCd2As2

Abstract

Tri(tert-butyl)methylenphosphoran : Konsequenzen sterischer Hinderung für innermolekulare Beweglichkeit und thermischen Zerfallsmechanismus / Tri(tert-butyl)methylenephosphorane : Consequences of Sterical Hindrance for Intramolecular Motions and Thermal Decomposition Mechanism

Abstract

Abstract

Abstract

A Study of Vanadium-51 Shielding in VO3+ Compounds

Abstract

Anionenaktivierung, V / Anion Activation, V

Charakterisierung des anionenaktivierenden Verhaltens makrozyklischer Polyether im Verlauf nukleophiler Substitutionsreaktionen bei homogener Reaktionsführung / Characterisation of Anion Activation by Macrocyclic Polyethers during Nucleophilic Substitutions under Homogeneous Conditions

Abstract

Abstract

Chromchalkogenide, IX1 Ternare Sulfide der Systeme Calcium—Chrom—Schwefel, Strontium—Chrom—Schwefel und Barium—Chrom—Schwefel / Chromium Chalcogenides, IX1 Ternary Sulfides of the Systems Calcium Chromium Sulfur, Strontium Chromium Sulfur, and Barium Chromium Sulfur

Abstract

Aktive Zentren in CaNaX und NiNaX-Zeolithen / Active Sites in CaNaX and NiNaX Zeolites

Abstract

Synthese und Eigenschaften von Rhenium-Komplexen mit N2-, N2H2-, N2H4- und NH3-Liganden / Synthesis and Properties of Rhenium Complexes with N2, N2H2, N2H4 and NH3 Ligands

Abstract

Übergangsmetall-Carbin-Komplexe, XXXIII1 Thermische Abspaltung von Carbinliganden aus trans-Bromotetracarbonyl(organylcarbin)chrom-Komplexen / Transition Metal Carbyne Complexes, XXXIII1 Thermal Cleavage of Carbyne Ligands from trans-Bromotetracarbonyl(organylcarbyne)chromium Complexes

Abstract

Kurzzeitpyrolyse, VI Ringverengungen durch CO-Eliminierung aus cyclischen Carbonylverbindungen / Short Time Pyrolysis, VI Ring Contractions by CO-Elimination from Cyclic Carbonyl Compounds

Abstract

Zum Mechanismus der Hydrolyse des Adenosin-3′.5′-cyclophosphatbenzylesters / On the Mechanism of Adenosine-3′,5′-cyclophosphatebenzylester Hydrolysis

Abstract

Correlations between the Stereochemistry and the Chemical Ionization Spectra of Epimeric 3,4-Dimethyl-1,2-cyclopentanediols

Abstract

Nuclear Magnetic Resonance Studies on Aromatic Compounds, IV 13C NMR Spectra of Some Disulpho-substituted 1- and 2-Naphthols

Abstract

Heterocyclic Compounds Synthesis of 7,14-Diacetyl-3,10-diethoxy-6,13-dihalo-triphenodithiazine and Derivatives

Abstract

Formose-Reaktion, I Kinetik und Mechanismus der Sekundärreaktionen bei Anwesenheit von Formaldehyd / Formose Reaction, I Kinetics and Mechanism of the Secondary Reaction Step in the Presence of Formaldehyde

Abstract

Notizen: CaFe6Al6O19 mit Magnetoplumbitstruktur / CaFe6Al6O19 with Magnetoplumbite Structure

Abstract

Notizen: Zur Darstellung und Kristallstruktur von Ba2MnTe3 / Preparation and Crystal Structure of Ba2MnTe3

Abstract

Notizen: Structures, Energies, and Reactivities of Bridgehead Olefins

Abstract

Darstellung und Kristallstruktur von Na₂CuP, K₂AgAs, K₂AgSb und K₂AgBi / Preparation and Crystal Structure of Na₂CuP, K₂AgAs, K₂AgSb, and K₂AgBi

LiFe₆Ge₅ und LiFe₆Ge₄ Zwei Phasen mit enger Strukturbeziehung zu der Verbindung LiFe₆Ge₆ / LiFe₆Ge₅ and LiFe₆Ge₄ Two Phases with Close Structure Relations to the Compound LiFe₆Ge₆

AB₂X₂-Verbindungen im CaAl₂Si₂-Typ, III Zur Struktur der Verbindungen CaZn₂P₂, CaCd₂P₂, CaZn₂As₂ und CaCd₂As₂ / AB₂X₂ Compounds with the CaAl₂Si₂ Structure, III The Crystal Structure of CaZn₂P₂, CaCd₂P₂, CaZn₂As₂, and CaCd₂As₂

A Study of Vanadium-51 Shielding in VO³⁺ Compounds

Chromchalkogenide, IX¹ Ternare Sulfide der Systeme Calcium—Chrom—Schwefel, Strontium—Chrom—Schwefel und Barium—Chrom—Schwefel / Chromium Chalcogenides, IX¹ Ternary Sulfides of the Systems Calcium Chromium Sulfur, Strontium Chromium Sulfur, and Barium Chromium Sulfur

Synthese und Eigenschaften von Rhenium-Komplexen mit N₂-, N₂H₂-, N₂H₄- und NH₃-Liganden / Synthesis and Properties of Rhenium Complexes with N₂, N₂H₂, N₂H₄ and NH₃ Ligands

Übergangsmetall-Carbin-Komplexe, XXXIII¹ Thermische Abspaltung von Carbinliganden aus trans-Bromotetracarbonyl(organylcarbin)chrom-Komplexen / Transition Metal Carbyne Complexes, XXXIII¹ Thermal Cleavage of Carbyne Ligands from trans-Bromotetracarbonyl(organylcarbyne)chromium Complexes

Nuclear Magnetic Resonance Studies on Aromatic Compounds, IV ¹³C NMR Spectra of Some Disulpho-substituted 1- and 2-Naphthols

Notizen: CaFe₆Al₆O₁₉ mit Magnetoplumbitstruktur / CaFe₆Al₆O₁₉ with Magnetoplumbite Structure

Notizen: Zur Darstellung und Kristallstruktur von Ba₂MnTe₃ / Preparation and Crystal Structure of Ba₂MnTe₃