Published by De Gruyter

Volume 36 Issue 8

Issue of Zeitschrift für Naturforschung B

Contents
Journal Overview

Open Access June 2, 2014

N-Brom-N-chlorsulfonamide. Herstellung und Reaktionen mit Phenylmetallverbindungen/N-Bromo-N-chlorosulfonamides. Preparation and Reactions with Phenylmetallics

Steffen Mohr, Jochen Jander, Hans Peter Latscha

Page range: 901-903

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Abstract

The preparation of CH 3 SO 2 NBrCl and p-CH 3 C 6 H 4 NBrCl is described. These compounds react with (C 6 H 5 ) 4 Sn, (C 6 H 5 ) 4 Pb, and (C 6 H 5 ) 2 Hg to give derivatives CH 3 SO 2 N(C1)M(C 6 H 5 ) n-1 . In these reactions one phenyl group is cleaved from the metal.

Open Access June 2, 2014

NMR-Untersuchungen an Organoelement(IVb)-phosphinen, VII [1] ¹¹⁹Sn-NMR-Untersuchungen an Trimethylstannylphosphin-substituierten Verbindungen der Pseudonickelcarbonylserie/NMR Studies on Organoelement(IVb)-phosphines, VII [1] ¹¹⁹Sn NMR Spectroscopic Investigations on Trimethylstannylphosphine Substituted Compounds of the Pseudonickelcarbonyl Series

Manfred Meißner, Heinz-Jürgen Kroth, Karl-Heinz Köhricht, Herbert Schumann

Page range: 904-906

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Abstract

119 Sn NMR chemical shifts as well as 1 H 119 Sn and 31 P 119 Sn NMR coupling constants are reported and discussed for compounds of the type [(CH 3 ) 3 Sn] n [ t C 4 H 9 ] 3-n P (n = 1, 2, 3) and related complexes Mn(NO) 3 L, Fe(CO)(NO) 2 L, Co(CO) 2 (NO)L and Ni(CO) 3 L (L = organotin phosphine).

Open Access June 2, 2014

Eine neue Form von Al(H₂PO₄)₃ mit dreidimensionaler Al-O-P-Vernetzung/ A New Form of Al(H₂PO₄)₃ with Three-Dimensional Al-O-P Crosslinking

Dieter Brodalla, Rüdiger Kniep, Dietrich Mootz

Page range: 907-909

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Abstract

3 ∞ [Al(H 2 PO 4 ) 3 ] has been prepared and characterized as a second modification of aluminium tris(dihydrogenphosphate). Its crystal structure is a three-dimensional Al-O-P network of AlO 6 octahedra, linked by common vertices through O 2 P(OH) 2 tetrahedra with six further octahedra. Each P-OH group is a proton donor as well as a proton acceptor of O-H···O hydrogen bonds arranged in angular chains of alternating polarity in macroscopic domains.

Open Access June 2, 2014

Kohlensäureesterphosphide - Synthese und Reaktionsverhalten/ Carbonic Ester Phosphides - Synthesis and Chemical Behaviour

Rüdiger Thamm, Ekkehard Fluck

Page range: 910-916

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Abstract

Primary phosphanes, RPH 2 , react with carbonic ester chlorides, ClCOOR′, in the presence of K 2 C0 3 to yield the title compounds RPHCOOR′ and RP(COOR′) 2 . The NMR data of the novel compounds are presented and discussed. Other physical and some chemical properties are described.

Open Access June 2, 2014

Struktur- und Phasenübergangsuntersuchungen an β-Li₂ZnGe/ Structure and Phase Transition Investigations on β-Li₂ZnGe

Hans-Otto Cullmann, Heinz-Walter Hinterkeuser, Hans-Uwe Schuster

Page range: 917-921

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Abstract

The ternary compound β-Li 2 ZnGe was prepared and its structure determined from powder and single crystal data. The compound crystallizes in a modified Na 3 As type structure, space group Ṗ̇̇̇̇̇̇̇̇̇̇̇̇̇̇3̄ m 1 - D 3 3d .The cell parameters are: a = 432.6 pm, c = 1647.0 pm, c/a= 3.83. A phase transition between a-and β-Li 2 ZnGe was found and the reaction of the elements lithium, zinc and germanium to a-Li 2 ZnGe was followed by differential thermal analysis. The temperatures and the enthalpies of transition and fusion were determined.

Open Access June 2, 2014

Kristall-und Molekülstrukturen von Benzoato-pyridin-iod(I) und Phthalato-bis(pyridin-iod(I))/ Crystal and Molecular Structures of Benzoato-pyridine-iodine(I) and Phthalato-bis(pyridine-iodine(I))

Hans Hartl, Martina Hedrich

Page range: 922-928

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Abstract

Benzoato-pyridine-iodine(I) and phthalato-bis(pyridine-iodine(I)) crystallize in the monoclinic spacegroup P2 1 /c. In both cases iodine(I) shows an almost linear coordination towards the pyridine-N and one carboxylate-O donor atom. The I -N distances range from 228 to 232 pm, the I - O distances from 213 to 219 pm. The vibrational spectra contain frequencies in the range 136-145 and 164-175 cm - 1 assigned to the quasi-symmetric and quasi-antisymmetric N-I-O-vibrations. The IR and Ra spectra of the benzoate and phthalate ligands are similar to those of the crystalline benzoic and phthalic acids.

Open Access June 2, 2014

Dialkylallenylidenekomplexe mit Pentacarbonylfragmenten der VIb Metalle/Dialkylallenylidene Complexes with Pentacarbonyl Fragments of VI b Metals

Heinz Berke, Peter Härter, Gottfried Huttner, Laszlo Zsolnai

Page range: 929-937

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Abstract

In the context of the synthesis of allenylidene compounds, the reaction of methylpropiolate with a (OC) 5 CrO(C 2 H 5 ) 2 complex was investigated. The species pentacarbonyl- (methylpropiolate)chromium(0) (1), 2,4-bis(methoxycarbonyl)-cyclobut-2-en-1-yliden-1- pentacarbonylchromium(0) (2) and cis-2,4-dimethoxycarbonyl-1,3-butadien-1 -yliden-1 - pentacarbonylchromium (3) were isolated. Attempts to synthesize allenylidene complexes from 1 were unsuccessful. Di-iso-propyl or di-tert-butylallenylidene complexes with chromium or tungsten centers (4a, 4b, 5a, 5b) were finally obtained by the photochemical reaction of pentacarbonylpropargylates, (OC) 5 MC(O)C ≡ CCR 2 O 2- , M = Cr, W, and subsequent desoxygenation. The complexes 4 a, b were characterized as triphenylphosphane adducts, di-iso-propylallenylidenetriphenylphosphorane complexes (6a und 6b). The structure of 6 a was determined by X-ray methods.

Open Access June 2, 2014

Substitutionsreaktionen von Tetracarbonyl(dihydrido)eisen mit Trimethylphosphit/Substitution Reactions of Tetracarbonyl(dihydro)iron with Trimethylphosphite

Heinz Berke, Gottfried Huttner, Laszlo Zsolnai

Page range: 938-944

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Abstract

The reaction of H 2 Fe(CO) 4 with trimethylphosphite in various stoichiometric ratios is reported. The compounds H 2 Fe(CO) 2 [P(OCH 3 ) 3 ] 2 (stoichiometry of reactants 1:2), H 2 Fe(CO) 3 P(OCH 3 ) 3 (1:1), Fe 3 (CO) 11 [P(OCH 3 ) 3 ], and H 3 Fe 4 (CO) 11 [P(OCH 3 ) 2 ] (3.5:1) were obtained.

Open Access June 2, 2014

Darstellung und Charakterisierung von Triphenylbleiderivaten einiger Aminosäuren/Preparation and Characterization of Triphenyllead Derivatives of Some Amino Acids

Gerd Roge, Friedo Huber

Page range: 945-948

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Abstract

Triphenyllead derivatives Ph 3 PbL (HL = glycine, alanine, phenylalanine) and (Ph 3 Pb) 2 L′ (H 2 L′ = aspartic acid) have been prepared from Ph 3 PbOH and the appropriate amino acid. PH 3 Pb-leucinate has been synthesized from Ph 3 PbCl and Tl(I)-leucinate. From IR data structural proposals are inferred: Ph 3 Pb-glycinate is polymeric through monodentate carboxylate and coordinating NH 2 ; Ph 3 Pb-alaninate, -phenylalaninate, and -leucinate contain bidentate carboxylate and non-coordinating NH 2 groups and are probably monomeric. For (Ph 3 Pb) 2 -aspartate and (Me 3 Sn) 2 -aspartate a structure with coordinating NH 2 and mono-and bidentate carboxylate groups is proposed.

Open Access June 2, 2014

Stability Constants of Metal Ion Complexes of Cyclopentadienyltris(diethylphosphito-P)cobaltate(1-), [(C₅H₅)CO{P(O)(OC₂H₅ )₂ }₃ ]^-, an Oxygen Tripod Ligand

Giorgio Anderegg, Wolfgang Kläui

Page range: 949-951

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Abstract

The formation of metal ion complexes ML (n-1)+ and ML 2 (n-2)+ of the oxygen tripod ligand L - = cyclopentadienyltris(diethylphosphito-P)cobaltate(l-) with metal ions M n+ = Li + , Na + , K + , Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ , Mn 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ ,Cd 2+ , Hg 2+ , Pb 2+ , Ag + ,and La 3+ has been studied by pH titration at 25 °C in 95/5 methanol/water solutions kept at an ionic strength of 0.1 by means of tetramethylammonium chloride. The stability of the alkali metal ion complexes increases with decreasing metal ion radii. The sodium complex NaL is more stable than the known crown ether sodium complexes. The K 1 values of the transition metal complexes ML+ are ≈ 10 9 [1/mol]. For H + , Na + , Mg 2+ , and La 3+ the enthalpies and entropies of complex formation have been determined by calorimetric measurements. The results are comparable to those of the tripolyphosphate anion. The complex formation is slightly endothermic and the stability of the complexes arises from a large positive ⊿S of reaction.

Open Access June 2, 2014

The Crystal and Molecular Structure of the 1:2 5,10-Dihydro-5,10-diethylphenazine-(E₂P)-2,2′-(2,5-Cyclohexadiene-1,4- diylidene)bispropanedinitrile (TCNQ) Complex

K. Dietz, H. Endres, H. J . Keller, W. Moroni

Page range: 952-955

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Abstract

C 16 H 18 N 2· 2 C 12 H 4 N 4 , C 40 H 26 N 10 , Mr = 646.7, crystallizes in space group P1̄ with a = 6.843(2), 6 = 7.845(3), c = 16.208(7) Å, α = 84.59(3), β = 81.63(3), γ = 75.75(3)°, V = 832.9 Å 3 , Z = 1, d c = 1.29 Mgm -3 . Final weighted R = 0.107 based on 2894 reflections. The structure consists of stacks of TCNQ π-dimers with interplanar distances of 3.25(1) Å within a dimer and 3.54(1) A between dimers. The phenazine species do not form stacks and show no electronic interaction with adjacent E 2 P or TCNQ molecules.

Open Access June 2, 2014

The Structure of the Cyclopentathiazenium Cation (S₅N₅⁺) - a MNDO Investigation

Rolf Gleiter, Richard Bartetzko

Page range: 956-957

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Abstract

The total energies, heats of formation (⊿H f ), bond lengths and bond angles of four isomers of S 5 N 5 + (1) have been calculated using the MNDO method. The heart shaped and azulene like structures 1 e and 1 f have been found to be the most stable isomers with about equal energies.

Open Access June 2, 2014

cis -Bis(2 -methoxyphenyl)bis (triphenylphosphan)platin(II) Synthese, Kristall- und Molekülstruktur und thermisches Verhalten/cis-Bis(2-methoxyphenyl)bis(triphenylphosphane)platinum(II) Synthesis, Crystal and Molecular Structure and Thermal Stability

Tony Debaerdemaeker, Heinz-Peter Klein, Manfred Wiege, Hans Albert Brune

Page range: 958-966

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Abstract

cis-Bis(2-methoxyphenyl)bis(triphenylphosphane)platinum(II) has been synthesized and its molecular and crystal structure determined by X-ray analysis. The structure is discussed with respect to the transition state of the thermal reductive elimination of 2,2′ -bismethoxybiphenyl.

Open Access June 2, 2014

Identification of Protected Deoxyribonucleotides by Field Desorption Mass Spectrometry in Fractions from High Performance Liquid Chromatography

Hans Martin Schiebel, Hans-Rolf Schulten

Page range: 967-973

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Abstract

Protected deoxyribonucleotides were identified by field desorption mass spectrometry in eluate fractions from high performance liquid chromatography. The production of abundant cationized molecules and the formation of structural significant fragments by thermally/field induced processes allowed a direct and unambiguous identification of the synthesized products. In addition, indications can be obtained on both organic and inorganic impurities.

Open Access June 2, 2014

Das dynamische Verhalten des 1-Methyl-1-benzothiepinium-Ringsystems/The Dynamic Behaviour of the 1-Methyl-1-benzothiepinium Ring System

Hans Hofmann, Franz Dickert

Page range: 974-977

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Abstract

By 1 H NMR spectroscopy the stereochemistry of the 1-methyl-1-benzothiepinium ring system was investigated both in thermodynamic and kinetic respects. It was shown that in solution a rapid mutual conversion of the boat shaped seven membered ring system with exo-respectively endo-S-methyl group occurs via a ring inversion and not by a pyramidal inversion at the sulfonium ion. At room temperature predominantly the conformation with the exo-S-methyl group is present.

Open Access June 2, 2014

Conformational Studies of R-(+)-2-Alkylidene-and R-(—)-2-Benzylidene-5-methylcyclohexanones

Devinder K. Anand, Michael K. Hargreaves, Mohsin A. Khan

Page range: 978-988

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Abstract

The cis and trans 2-alkylidene-5-methylcyclohexanones have been separated and distinguished. 2-Benzylidene-5-methylcyclohexanone was also prepared in both forms. The CD, ORD, UV and IR spectra are recorded and discussed. The NMR data include solvent and temperature effects.

Open Access June 2, 2014

Inhibitoren der Korrosion 26 Die Struktur der bei der Korrosion von Kupfer in Gegenwart von 2-Aminopyrimidin (Sauerstoff, NaCl, pH 4,1, 22 °C) aufgebauten Schutzschicht/ Corrosion Inhibitors 26 The Structure of the Protecting Coating Formed During the Corrosion of Copper (Oxigen, NaCl, pH 4.1, 22 °C) in the Presence of 2-Aminopyrimidine

L. Horner, E. Pliefke

Page range: 989-996

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Abstract

The analysis of the protective coating produced during the corrosion of copper in the presence of 2-aminopyrimidine (2-AP) is consistent with the composition [Cu 1+ -2-AP-Cl] n . The individual units form a three-dimensional macro-structure via chloride bridging and hydrogen bonding. The assignment of the structure was supported by NMR, IR, UV and magnetic susceptibüity measurements and an X-ray investigation using the Debye- Scherrer powder method. The thermal behaviour of the coating was studied by massspectral and DTA (differential thermal analysis) methods. Radiochemical experiments were carried out using active copper samples (i.e. containing 64 Cu), or using added 64 CuCl and 64 CuCl 2 in the corrosion of non-active copper both in the presence and absence of added 2-AP. The results elucidate the exchange reactions at the copper surface between dissolved and metallic components. The equilibrium between Cu 2+ and metallic copper on the one hand and 2 Cu 1+ ions on the other is central to the problem, as is also the dissociation of the [Cu 1+ -2-AP-Cl] n complex. The concepts here developed were confirmed by studies of the autoxidation of CuCl and CuO in the presence and absence of 2-AP.

Open Access June 2, 2014

Konfigurations-Bestimmung von Isomeren des Methyl 4-O-Acetyl-2.3-O-(1-phenylethyliden)-α-L-rhamnopyranosides/ The Configuration of Isomeres of Methyl 4-O-Acetyl-2,3-O-(1-phenylethylidene)-α-L-rhamnopyranoside

Hermann Lotter, András Lipták

Page range: 997-999

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Abstract

The diastereomeric 2,3-O-[2-phenyl-2-methyl-1,3 dioxalanes] of methyl-α-L-rhamno-pyranosides were synthesised for the first time. The stereochemical characterisation was carried out by X-ray analysis. Evaluation of the X-ray data and comparison with NMR data indicated that the same configuration exists in the crystalline state as in solution.

Open Access June 2, 2014

Conformations of Chlorophylls a and a′ and their Magnesium-Free Derivatives as Revealed by Circular Dichroism and Proton Magnetic Resonance

Paavo H. Hynninen, Gunnel Sievers

Page range: 1000-1009

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Abstract

The electronic absorption (UV/VIS), circular dichroism (CD) and proton magnetic resonance ( 1 H NMR) spectra have been recorded for C-10 epimeric chlorophylls a and a′, pheophytins a and a′ as well as pheophorbides a and a′. Although the epimers in each pair showed virtually identical UV/VIS spectra, their CD spectra were profoundly different and exhibited opposite signs at most wavelengths in the UV region. The differences were interpreted as arising, in part, from different C-10 configurations, and, in part, from conformational alterations induced by the steric strain in the crowded periphery of the macrocycle. The conformational alterations were also clearly indicated by the 1 H NMR Δδ-values observed for the α,β and δ methine protons, the C-10 protons and most methyl group protons of the epimers in each pair. This was considered to imply changes in the geometry of the whole macrocycle. The Δδ-values were larger for the Mg-free epimers than for the chlorophyll epimers, which shows that the central Mg-atom makes the macrocycle more rigid. Correlations between the signs of the CD bands and configurations are discussed.

Open Access June 2, 2014

Mechanism of the Allomerization of Chlorophyll: Inhibition of the Allomerization by Carotenoid Pigments

Paavo H. Hynninen

Page range: 1010-1016

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Abstract

It is shown that the allomerization of chlorophylls a and b is effectively inhibited by carotenoid pigments. In the light of this finding, two possible mechanisms are considered for the allomerization. One assumes the addition of singlet oxygen to the 9,10-double bond of the chlorophyll (Chl) enolate anion to yield a C-10 hydroperoxide or a dioxetane derivative. The other assumes a free-radical chain reaction involving Chl enolate anion, triplet oxygen, Chl C-10 radicals and peroxide radicals, and Chl C-10 hydroperoxide. The observation that the allomerization and its inhibition by carotenoids occur under carefully controlled dark conditions precluding singlet oxygen formation provides substantial support to the latter mechanism. Further evidence for the free-radical mechanism is obtained by observing the increase of the allomerization rate when air is replaced with pure oxygen from a container. The rate increases to about two-fold in the methanolic Chl solution containing no carotenoid but remains close to zero in the Chl solution containing an equimolar amount of β-carotene. The relevance of the results to photosynthesis and cancer research is briefly discussed.

Open Access June 2, 2014

Kernresonanz-Untersuchunghen von 1.2.3-Selenadiazolen/ Nuclear Magnetic Resonance of 1,2,3-Selenadiazoles

Herbert Meier, Johannes Zountsas, Oswald Zimmer

Page range: 1017-1022

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Abstract

A 1 H and 13 C NMR spectroscopical study is performed on the basis of 37 1,2,3-selena-diazoles. Besides the discussion of chemical shifts and coupling constants of 1 H and 13 C, selenium satellites were measured providing 1 H 77 Se and 13 C 77 Se coupling constants.

Open Access June 2, 2014

Zur Stereochemie der Bisaboloide aus Matricaria chamomilla L/On the Stereochemistry of the Bisaboloids from Matricaria chamomilla L.

Elmar Flaskamp, Gerhard Nonnenmacher, Gottfried Zimmermann, Otto Isaac

Page range: 1023-1030

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Abstract

The stereochemistry of the bisaboloids in chamomile-with the exception of bisabolol-oxide C-has been elucidated. The in-vitro-examination of the mutual convertibilities of some bisaboloids gave evidence for the stereochemical accordance of the common chiral centres of all the bisaboloids. The absolute configurations of the remaining third asymmetric carbon atoms in bisabololoxide A and B have been determined by NMR spectrometric studies in comparison with their unnatural semisynthetic epimers. All the stereogenic centres of the bisabololoxides A and B, of (-)-α-bisabolol and of bisabolonoxide A turn out to be S-configurated.

Open Access June 2, 2014

Untersuchungen an quartären Pyridinium-Salzen, XIV Dihydropyridyl-oximether/Investigations of Quaternary Pyridinium Salts, XIV Dihydropyridyl-oxime-ethers

Wolf-H. Gündel

Page range: 1031-1036

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Abstract

Pyridinium Salts with electron-withdrawing groups in the 3-position react with aliphatic ketoximes under basic conditions to lipophilic addition products, 6-(alkylideniminoxy)-1,6-dihydropyridines.

Open Access June 2, 2014

Phenazine aus Pseudomonden/Phenazines from Pseudomonads

A. Römer, H. Scholl, H. Budzikiewicz

Page range: 1037-1046

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Abstract

The structure elucidation of several minor phenazine pigments of Pseudomonads is described. 4-Hydroxyphenazine-1,6-dicarboxylic acid dimethyl ester, 2,3-dihydroxyphenazine, 2,3,7-trihydroxyphenazine, 4-hydroxyphenazine-1-carboxylic acid, 2,3-dihydroxyphenazine-1-carboxylic acid, 2,6-dihydroxyphenazine-1-carboxylic acid and 2,3,7-trihydroxyphenazine-1,6-dicarboxylic acid are new phenazine derivatives. The distribution of phenazines in the genus Pseudomonas is investigated.

Open Access June 2, 2014

Notizen:The Reaction of Dithiocarboxylic Acids with Imines

Masaru Ishida, Shinzi Kato, Masateru Mizuta

Page range: 1047-1049

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Abstract

Aromatic dithiocarboxylic acids 1 react with imines 4 to give the corresponding adducts 5, aminomethyl dithiocarboxylates, in good yields. The adducts 5 react with phenacyl bromide to give the corresponding phenacyl dithiocarboxy-lates 6.

Open Access June 2, 2014

Darstellung und Struktur von Di-gold(III)bis(selenit)(diselenit), Au₂(SeO₃ )₂(Se₂O₅)/Preparation and Crystal Structure of Di-gold(III)bis(selenite) Diselenite, Au₂(SeO₃ )₂(Se₂O₅)

Peter G. Jones, Einhard Schwarzmann, George M. Sheldrick, Harald Timpe

Page range: 1050-1052

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Abstract

The compound Au 2 (SeO 3 ) 2 (Se 2 O 5 ) was prepared from gold metal and seienic acid at 553 K. The crystal structure [C2/c, a = 2034.4(5), b = 413.0(1), c = 1325.4(3) pm, β = 115.88(3)°, Z = 4] was refined to R = 0.035. Both gold atoms lie on crystallographic centres of symmetry and show square planar coordination (Au-0 196.9-201.3 pm). The extended structure consists of three cross-linked systems of the form [··· -Au-(selenite or diselenite) -Au-···].

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 36 Issue 8

Issue of Zeitschrift für Naturforschung B

N-Brom-N-chlorsulfonamide. Herstellung und Reaktionen mit Phenylmetallverbindungen/N-Bromo-N-chlorosulfonamides. Preparation and Reactions with Phenylmetallics

Abstract

Abstract

Eine neue Form von Al(H2PO4)3 mit dreidimensionaler Al-O-P-Vernetzung/ A New Form of Al(H2PO4)3 with Three-Dimensional Al-O-P Crosslinking

Abstract

Kohlensäureesterphosphide - Synthese und Reaktionsverhalten/ Carbonic Ester Phosphides - Synthesis and Chemical Behaviour

Abstract

Struktur- und Phasenübergangsuntersuchungen an β-Li2ZnGe/ Structure and Phase Transition Investigations on β-Li2ZnGe

Abstract

Kristall-und Molekülstrukturen von Benzoato-pyridin-iod(I) und Phthalato-bis(pyridin-iod(I))/ Crystal and Molecular Structures of Benzoato-pyridine-iodine(I) and Phthalato-bis(pyridine-iodine(I))

Abstract

Dialkylallenylidenekomplexe mit Pentacarbonylfragmenten der VIb Metalle/Dialkylallenylidene Complexes with Pentacarbonyl Fragments of VI b Metals

Abstract

Substitutionsreaktionen von Tetracarbonyl(dihydrido)eisen mit Trimethylphosphit/Substitution Reactions of Tetracarbonyl(dihydro)iron with Trimethylphosphite

Abstract

Darstellung und Charakterisierung von Triphenylbleiderivaten einiger Aminosäuren/Preparation and Characterization of Triphenyllead Derivatives of Some Amino Acids

Abstract

Stability Constants of Metal Ion Complexes of Cyclopentadienyltris(diethylphosphito-P)cobaltate(1-), [(C5H5)CO{P(O)(OC2H5 )2 }3 ]-, an Oxygen Tripod Ligand

Abstract

The Crystal and Molecular Structure of the 1:2 5,10-Dihydro-5,10-diethylphenazine-(E2P)-2,2′-(2,5-Cyclohexadiene-1,4- diylidene)bispropanedinitrile (TCNQ) Complex

Abstract

The Structure of the Cyclopentathiazenium Cation (S5N5+) - a MNDO Investigation

Abstract

cis -Bis(2 -methoxyphenyl)bis (triphenylphosphan)platin(II) Synthese, Kristall- und Molekülstruktur und thermisches Verhalten/cis-Bis(2-methoxyphenyl)bis(triphenylphosphane)platinum(II) Synthesis, Crystal and Molecular Structure and Thermal Stability

Abstract

Identification of Protected Deoxyribonucleotides by Field Desorption Mass Spectrometry in Fractions from High Performance Liquid Chromatography

Abstract

Das dynamische Verhalten des 1-Methyl-1-benzothiepinium-Ringsystems/The Dynamic Behaviour of the 1-Methyl-1-benzothiepinium Ring System

Abstract

Conformational Studies of R-(+)-2-Alkylidene-and R-(—)-2-Benzylidene-5-methylcyclohexanones

Abstract

Abstract

Konfigurations-Bestimmung von Isomeren des Methyl 4-O-Acetyl-2.3-O-(1-phenylethyliden)-α-L-rhamnopyranosides/ The Configuration of Isomeres of Methyl 4-O-Acetyl-2,3-O-(1-phenylethylidene)-α-L-rhamnopyranoside

Abstract

Conformations of Chlorophylls a and a′ and their Magnesium-Free Derivatives as Revealed by Circular Dichroism and Proton Magnetic Resonance

Abstract

Mechanism of the Allomerization of Chlorophyll: Inhibition of the Allomerization by Carotenoid Pigments

Abstract

Kernresonanz-Untersuchunghen von 1.2.3-Selenadiazolen/ Nuclear Magnetic Resonance of 1,2,3-Selenadiazoles

Abstract

Zur Stereochemie der Bisaboloide aus Matricaria chamomilla L/On the Stereochemistry of the Bisaboloids from Matricaria chamomilla L.

Abstract

Untersuchungen an quartären Pyridinium-Salzen, XIV Dihydropyridyl-oximether/Investigations of Quaternary Pyridinium Salts, XIV Dihydropyridyl-oxime-ethers

Abstract

Phenazine aus Pseudomonden/Phenazines from Pseudomonads

Abstract

Notizen:The Reaction of Dithiocarboxylic Acids with Imines

Abstract

Darstellung und Struktur von Di-gold(III)bis(selenit)(diselenit), Au2(SeO3 )2(Se2O5)/Preparation and Crystal Structure of Di-gold(III)bis(selenite) Diselenite, Au2(SeO3 )2(Se2O5)

Abstract

Eine neue Form von Al(H₂PO₄)₃ mit dreidimensionaler Al-O-P-Vernetzung/ A New Form of Al(H₂PO₄)₃ with Three-Dimensional Al-O-P Crosslinking

Struktur- und Phasenübergangsuntersuchungen an β-Li₂ZnGe/ Structure and Phase Transition Investigations on β-Li₂ZnGe

Stability Constants of Metal Ion Complexes of Cyclopentadienyltris(diethylphosphito-P)cobaltate(1-), [(C₅H₅)CO{P(O)(OC₂H₅ )₂ }₃ ]^-, an Oxygen Tripod Ligand

The Crystal and Molecular Structure of the 1:2 5,10-Dihydro-5,10-diethylphenazine-(E₂P)-2,2′-(2,5-Cyclohexadiene-1,4- diylidene)bispropanedinitrile (TCNQ) Complex

The Structure of the Cyclopentathiazenium Cation (S₅N₅⁺) - a MNDO Investigation

Darstellung und Struktur von Di-gold(III)bis(selenit)(diselenit), Au₂(SeO₃ )₂(Se₂O₅)/Preparation and Crystal Structure of Di-gold(III)bis(selenite) Diselenite, Au₂(SeO₃ )₂(Se₂O₅)