bluuebunny/crossref_metadata_2025 huggingface dataset:
Photolysis (λ =185 nm) of Liquid Pivalaldehyde Dimethyl Aceta
Authors: Naderwitz Peter , Schuchmann Heinz-Peter , Von Sonntag Clemens
Published: March 2015

Deoxygenated liquid pivalaldehyde dimethyl acetal was photolyzed at λ = 185 nm, and 28 products have been determined. The major ones and their quantum yields are: methyl formate (0.47), isobutene (0.39), methane (0.28), neopentane (0.16), isobutane (0.13), formaldehyde dimethyl acetal (0.13), formaldehyde (0.09), methyl neopentyl ether (0.09), methanol (0.07), and methyl pivalate (0.04). The predominant primary photoprocesses are suggested to be the scission of the O–CH3 bond (homolytic, 0.51; molecular, 0.04) and the C-tBu bond (homolytic and molecular, 0.16). Minor processes are the scission of the C–OCH3 (molecular, 0.09; homolytic, 0.03), C–H (0.006), and C–CH3 bonds (< 0.01). The radical (A) eliminates with ease t-butyl (reaction (i)). This process is at least 10 times more efficient than methoxy elimination or hydrogen abstraction from the substrate.

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Notizen: Exchange of a H Atoms for Deuterium and Tritium in Cyclic N-Nitrosamines
Authors: Frank Norbert
Published: March 2015

The exchange of a protons for deuterium or tritium in di-N-nitrosohomopiperazine and in di-N-nitroso-2,6-dimethylpiperazine is described. It is shown that an exchange in bifunctional N-nitrosamines occurs in all acidic positions, even in those which are sterically hindered. In addition, it is demonstrated that a protons will also exchange for tritium in 3H2O enriched H2O, using KOH.
Über die Ladungsverteilung in Stickstoffverbindungen. ESCA-Untersuchungen an formylierten und acetylierten Ammoniak-Derivaten sowie an alkylierten und merkurierten Ammoniumsalzen / Charge Distribution in Nitrogen Compounds. ESCA Study of Formyl and Acetyl Derivatives of Ammonia and of Alkylated and Mercurated Ammonium Salts
Authors: Binder Herbert
Published: March 2015

Nitrogen 1 s energies are measured by ESCA for a series of formyl and acetyl derivatives of ammonia and of some alkylated and mercurated ammonium salts. For convenient use in chemical structure analysis the binding energy shifts are correlated with a charge parameter obtained from electronegativity considerations. The shifts are also analyzed in terms of group electronegativities. Comparison between the two classes of compounds gives evidence for π-bonding in formyl and acetyl derivatives of ammonia.
Studies on 3,5-Diamino Pyrazoles: Chemical Behavior of 4-Phenylazo-3,5-diaminopyrazoles
Authors: Elnagdi Mohamed Hilmy , Kandeel Ezzat Mohamed , Elmoghayar Mohamed Rifaat Hamza
Published: March 2015

The behaviour of 3,5-diamino-4-phenylazopyrazole (1) toward isothiocyanates, acrylonitrile and ethyl ethoxymethylenecyanoacetate is investigated. An improved synthesis of 4-unsubstituted-3,5-diaminopyrazoles by an arylazo removal reaction is also reported.
Die Molekül- und Kristallstruktur von Bis(diaminoglyoximato)kobalt(II)diamininoglyoxim, Co(C2H5N402)2 · C2H6N4O2 / The Crystal and Molecular Structure of Bis(diaminoglyoximato)cobalt(II)diaminoglyoxim, Co(C2H5N4O2)2 · C2H6N4O2
Authors: Bekaroglu Ö. , Sarisaban S. , Koray A. R. , Ziegler M. L.
Published: March 2015

The title compound has been synthesized and its structure determined by threedimensional X-ray data.
Elektronenbeugungsbestimmung der Molekülstruktur von 4-Fluor-2′,4′,6′ -trimethylbiphenyl / Molecular Structure of 4-Fluoro-2′,4′,6′-trimethylbiphenyl Determined by Electron Diffraction
Authors: Zeitz K. , Oberhammer H. , Häfelinger G.
Published: March 2015

The molecular structure of gaseous 4-fluoro-2′,4′,6′-trimethylbiphenyl was determined by electron diffraction. The average of two independend determinations leads to the following parameters for the structure:

CC(ring) = 1.398(1),CC(methyl) = 1.522(5), CH(ring) = 1.082(6), CH(methyl) = CH(ring) + 0.015 = 1.097(6), CF = 1.324(7), Cl-Cl′ = 1.488(9) (inter ring bond), ∢(C,C,H) = 109.9(1.8)° (angle of methylgroup tetrahedra), α = 124.9(0.6)° (angle of ortho-methyl-groups towards the inter ring bond), φ = 77.5(2.1)° (angle of torsion between the planes of the two phenyl rings) which are in good agreement with respect to known structural data on biphenylderivatives. A very interesting result is the angle of torsion with 77.5° which is by 6.5° smaller than the value of 84(1)° determined by X-ray crystallography for the corresponding 4-iodo-compound in the crystalline state1. In all determinations known to us til now for comparable derivatives of biphenyl the angle of torsion was found larger in the gaseous state than in the crystalline state.
Autocatalytic Effect in the Reduction of Some Schiff Bases
Authors: El-Cheikh F. , Khalil Z. H. , Khodair Ahmed I.
Published: March 2015

The autocatalytic effect of the reduction products of some selected Schiff bases on their reduction on copper and lead cathodes was investigated. The repitition of reduction efficiency measurements in the same solution and the pre-treatment of the cathode or the solution by electrolysis confirmed the autocatalytic effect of the produced secondary amines. Different amines were tested as external catalysts.
Notizen: Die ersten Brom-Elpasolithe: Cs2BILnIIIBr6 (BI = Na, K; LnIII= Sc, Tm, Sm) / The First Bromo-Elpasolites : Cs2BILnIIIBr6 (BI = Na, K; LnIII = Sc, Tm, Sm)
Authors: Meyer Gerd , Linzmeier Peter
Published: March 2015

The preparation of the hitherto unknown bromo-elpasolites Cs2BLnBr6 (B = Na, K; Ln = Sc, Tm, Sm) is reported. Besides Cs2KSmBr6 they all crystallize cubic-face centered, isostructural to K2NaAlF6 (elpasolite).
Notizen: Ein silacyclisches Triple-Ylid: 2.4.6-Tris-trimethylphosphoranyliden-1.3.5- trisilacyclohexan / A Silacyclic Triple-ylide : 2,4, 6-Tris-trimethylphosphoranylidene-1,3,5-trisilacyclohexane
Authors: Schmidbaur Hubert , Zimmer-Gasser Beate
Published: March 2015

From (chloromethyl)silane and trimethylphosphine a phosphonium salt

[(CH3)3P–CH2SiH3]Cl

is obtained, which can be converted into the ylide (CH3)3P=CHSiH3 upon transylidation with (CH3)3P = CH2. The silyl ylide is thermally unstable and looses hydrogen to give the title six-membered ring species.
Ternäre Erdalkali-Element(V)-Verbindungen AMg2B2 mit A = Ca, Sr, Ba und B = As, Sb, Bi / Ternary Alkaline Earth-Element(V)-Compounds AMg2B2 with A = Ca, Sr, Ba and B = As, Sb, Bi
Authors: Deller Klaus , Eisenmann Brigitte
Published: March 2015

The new compounds AMg2B2 (A = Ca, Sr, Ba; B = As, Sb, Bi) have been prepared and structurally characterized by X-ray single crystal investigations. They are isotypic and crystallize trigonally in the ordered anti-La2O3 (Ce2O2S)-type. The lattice constants (in Å ± 0.01) are

[xxx]

The compounds belong to the Zintl-phases, the coordination polyhedra of the element(V)-atoms are compared with those in the A2B and A5B3 compounds.
Markierte Verbindungen, XXVII Darstellung und katalytische Spaltung des Octachlor-(2-14C)propan / On Labelled Compounds, XXVII Synthesis and Catalytic Cleavage of Octachloro-(2-14C)propane
Authors: Boberg Friedrich , Habenstein Klaus , Voss Rainer
Published: March 2015

Starting with (1-14C)ethanol (2z) octachloro-(2-14C)propane (1 z) is synthesized according to Scheme 1. The skeleton of 1 z is rearranged by AlCl3. The equilibrium octachloropropane (1)/tetrachloromethane (11) + perchloroethylene (12) is proved by gaschromatography.
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
Authors: Schumann Herbert , Kroth Heinz-Jürgen
Published: March 2015

Nuclear spin-spin coupling constants 1J(31P-183W) are reported of trimethyl element (IVb)-phosphine substituted pentacarbonyl-tungsten complexes of the type [(CH3)3E]nPR3-n
W(CO)5 (E = C, Si, Ge, Sn; R = tC4H9, C6H5; n = 0, 1, 2, 3). Variations in the size of coupling constants are shown to depend mainly on the different ligand electronegativities.
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
Authors: Knöchel A. , Oehler J. , Rudolph G.
Published: March 2015

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.
Zum Mechanismus der Hydrolyse des Adenosin-3′.5′-cyclophosphatbenzylesters / On the Mechanism of Adenosine-3′,5′-cyclophosphatebenzylester Hydrolysis
Authors: Engels Joachim
Published: March 2015

The hydrolysis of benzyltriesters of adenosine 3′,5′-cyclophosphate with H2
18O 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.
Nuclear Magnetic Resonance Studies on Aromatic Compounds, IV 13C NMR Spectra of Some Disulpho-substituted 1- and 2-Naphthols
Authors: Räisänen Kauko , Lajunen Lauri H. J.
Published: March 2015

The 13C 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 13C nuclei. The combined influence of the mesomeric effect of the hydroxyl group and that of the sulphonate groups have been discussed.
Die Fragmentierung der Azo- und Hydrazontautomeren von 2.3-Dioxobutyranilid-2-phenylhydrazonen in der Gasphase in Abhängigkeit von Substituenten / The Fragmentation of Azo and Hydrazone Tautomeres of 2,3-Dioxobutyranilide-2-phenylhydrazones in the Gaseous State in Dependence of Substituents
Authors: Kettrup Antonius , Grote Manfred
Published: March 2015

Relative intensities of specific fragments of azo and hydrazone tautomeres in mass spectra are discussed. Linear relationship is given between calculated ZH(ZA)-values and pKB- and Hammett σ·values respectively. Electron donating substituents will lead to the formation of hydrazone tautomeres.
29Si-, 31P- und 13C-Kernresonanzuntersuchungen an N-silylierten Triorganophosphiniminen / Silicon-29, Phosphorus-31, and Carbon-13 Nuclear Magnetic Resonance Investigations of N-Silylated Triorganophosphine Imines
Authors: Buchner Wolfgang , Wolfsberger Werner
Published: March 2015

29Si, 31P and, in part, 13C NMR data are reported for N-trimethylsilyl-triorganophosphine imines as well as some siliconsubstituted methoxy and chloro derivatives. The spin-spin splitting pattern of the 29Si{1H} spectra is discussed for disilanes of the type (RR′R″P=N-SiMe2-)2. A qualitative interpretation of 29Si chemical shifts is preferably being based on hyperconjugation rather than a (p-d)n bonding mechanism. The preparation of a series of bis(phosphinimino)silanes and 1,2-bis(phosphinimino)disilanes is described.
Darstellung und Kristallstruktur von CaCuGe / Preparation and Crystal Structure of CaCuGe
Authors: Dörrscheidt Wolfgang , Niess Nicosia , Schäfer Herbbert
Published: March 2015

CaCuGe crystallizes orthorhombic, Pna21 with a = 2136 ± 2 pm, b = 754 ± 1 pm, c = 435 ± 1 pm, z = 12. The Cu atoms together with the Ge atoms form puckered layers parallel to the b/c-plane. Within each layer each Cu atom is bonded to three Ge atoms and viceversa. Between the layers the Ca atoms are located.
Über Derivate des Hydrazins, VII Zur Reaktivität von Bis(trimethylsilyl)aminoisocyanid / On Derivatives of Hydrazine, VII Reactivity of Bis(trimethylsilyl)aminoisocyanide
Authors: Wiberg Nils , Hübler Gerhard
Published: March 2015

The chemistry of bis(trimethylsilyl)aminoisocyanide (1) is determined by three reactive centres of the system : the hydrolyzable Si–N-bond, the oxidizable carbon in the formal oxidation state two, the additionable double bond system. Reactions of the oxygen stable compound 1 with halogens X2 or sulfenyl halides RSX as oxidizing agents gives compounds of type (Me3Si)2NNCX2 or (Me3Si)2NNCX(SR). Heterocumulenes such as CO2, CS2, RNCS (R = (Me3Si)2N), SO2 add to 1, leading to heterocycles, which decompose at higher temperatures by ring cleavage. With other heterocumulenes such as PhNCO, Me3SiNSO, Me3SiNSNSiMe3 products are found, the formation of which could be explained by reaction paths including the building and cleavage of heterocycles.
Reaktionen an komplexgebundenen Liganden, XXII Synthese und Reaktionen von Cyclopentadienyl-diphosphan-carbonyl-Eisen- und Chrom-Komplexen / Reactions at Complex Bonded Ligands, XXII Synthesis and Reactions of Cyclopentadienyl Diphosphane Carbonyl Iron and Chromium Complexes
Authors: Sellmann Dieter , Kleinschmidt Ernst
Published: March 2015

The synthesis of binuclear iron and chromium complexes with bridging dppe ligands is reported, e.g. [μ-dppe{C5H5Fe(CO)Br}2] or [μ-dppe{C5H5Cr(CO)(NO)}2], (dppe = (C6H5)2PC2H4P(C6H5)2). With hydrazine, these compounds yield no doubly bridged complexes with dppe and N2H4 bridges, neither in dark- nor in photo-reactions. In case of the iron complexes either reduction of the starting complex or transformation of the dppe bridging ligand into a chelating ligand are observed instead. The reactions depend upon the polarity of the solvent and yield [μ-dppe{C5H5Fe(CO)}2] in benzene, however, [C5H5Fe(CO)(dppe)]Br in tetrahydrofuran. The chromium complex undergoes decomposition on UV irradiation, splitting off CO and yielding the chelate complex [C5H5Cr(NO)(dppe)] as well as polymeric [C5H5Cr(NO)]x.
Zur Hochdruckpolymorphie der Oxidchloride (MOCI) von Er, Tm, Yb und Lu und neue Verbindungen des Formeltyps Ln3O4Cl / High Pressure Polymorphism of Rare Earth Oxychlorides of Er, Tm, Yb and Lu and New Compounds with the General Formula Ln3O4Cl
Authors: Beck H. P.
Published: March 2015

Rare earth oxychlorides crystallizing in the SmSI arrangement undergo a high pressure transformation to a PbFCl-type structure. An intermediate phase appearing during the transition supports a proposed mechanism of displacive and martensitic movements in several steps. The decomposition of PbFCl-type oxychlorides to new Ln3O4Cl compounds is discussed as a topotactic reaction.
Das 2-Oxazolinsystem als Schutzgruppe für die sterisch gehinderte Carboxylfunktion bei Grignard-Reaktionen: Synthese phosphororganischer Verbindungen mit einem o-Carboxyphenylrest / The 2-Oxazoline System as a Protecting Group for the Sterically Hindered Carboxyl Function in Grignard-Reactions: The Synthesis of Organophosphorus Compounds with an o-Carboxyphenyl Rest
Authors: Luckenbach Reiner , Lorenz Klaus
Published: March 2015

The efficiency of the 2-oxazoline system as a protecting group for the sterically hindered carboxyl function is demonstrated in the case of Grignard-reactions of certain organophosphorus compounds. Thereby, organophosphorus species with an o-carboxyphenyl group are easily accessible. Additionally, the enantiomer separation of an unsymmetrically substituted tertiary phosphine oxide with an o-carboxyphenyl group is described.
Radiation Chemistry of Carbohydrates, XV OH Radical Induced Scission of the Glycosidic Bond in Disaccharides
Authors: Zegota Henryk , Von Clemens
Published: March 2015

In the γ-radiolysis of deoxygenated, N2O-saturated aqueous solutions of maltose, lactose, gentiobiose, melibiose, trehalose and sucrose carbohydrate products containing five or six carbon atoms have been identified and their G-values measured. These products originate from the OH radical induced scission of the glycosidic bond of the disaccharides. The nature of the products is in agreement with a reaction scheme proposed previously for the radical induced scission of the glycosidic bond of cellobiose. It involves hydrolysis and the rearrangements of radicals with the free spin next to the glycosidic bond and to the lactol bridge. The nature the glycosidic bond (α, β, 1-4, 1-6, 1-1, 1, 2) has only little influence on the G-values of its scission which range between about 1.9 and 3.5.
Über Aminosäure-Antagonisten, III Synthese von 4-Alkoxy-2-oxo-trans-3-butensäurealkylestern / On Amino Acid Antagonists, III Syntheses of 4-Alkoxy-2-oxo-trans-3-butenoic Acid Esters
Authors: Trowitzsch Wolfram
Published: March 2015

The syntheses of the above biologically active esters are described. By NMR spectroscopy it is shown that the corresponding ethyl compound 4 may exist in both the trans and the cis conformers. Starting with 4, addition of an appropriate alcohol results in the corresponding 4-alkoxy compound of 4. The described esters are antagonists of aspartic acid as well as of oxalacetic acid and inhibited the growth of E. coli MRE 600.
Zur Reaktivität von C=N-Doppelbindungssystemen, XII1 über Kupfer(II)- und Nickel(II)-Komplexe von Aminomethylen-1.3-dicarbonylverbindungen / The Reactivity of the C=N-Double Bond System, XII1 Copper(II) and Nickel(II) Complexes of Aminomethylen-1,3-dicarbonyl Compounds
Authors: Wolfbeis Otto S. , Ziegler Erich
Published: March 2015

Reaction of active methylene compounds (2,4-pentanedione, dimedone, 4-hydroxycoumarin, 4-hydroxycarbostyriles) with triethyl orthoformate and primary amines (aniline, o-methylmercapto aniline, cyclohexylamine) yields substituted aminomethylen-1.3-dicarbonyles (1-5), which in their tautomeric form (B) give stable, deeply coloured Cu··- and Ni- --organic complexes (6-27). The same chelates may also be obtained by direct reaction of orthoformate, amine and active methylene in the presence of the metal acetate at 40-50 °C in 65-90% yield.

Anilinomethylene-3-methyl-1-phenylpyrazolone in turn does not exhibit any tendency to chelate Cu·· or Ni··. The X-ray crystallography of its o-methylmercaptoderivative shows it to exist in the virtually planar enamin form.
Notizen: Eine theoretische Interpretation der gegenseitigen Wechselwirkungsparameter in den 29Si–NMR-Verschiebungen / A Theoretical Interpretation of Mutual Interaction Parameters for 29Si NMR Chemical Shifts
Authors: Radeglia R.
Published: March 2015

The description of substituent dependence of 29Si NMR chemical shifts by means of pairwise interaction parameters is interpreted with a simple quantumchemical model theoretically.
Notizen: Darstellung und Kristalldaten der isomorphen Kupferthio(seleno)phosphate Cu7PS6 und Cu7PSee / Preparation and Crystal Data of the Isomorphous Copperthio(seleno)phosphates Cu7PS6 and Cu7PSe6
Authors: Kuhs W. F. , Schulte-Kellinghaus M. , Krämer V. , Nitsche R.
Published: March 2015

The title compounds were prepared by annealing the elements in stoichiometric proportions at 720 °C as well as by thermal decomposition of Cu3PS4 or Cu3PSe4. They crystallize in the space group P213 with lattice parameters a = 9.671(1) and 10.116(1) Å resp.; X-ray powder diffraction data are listed.
Umlagerungen von Heterocyclen, VI Über die Umsetzung von reaktiven Malonestera mit Benzalaceton und Cinnamoylaceton / Rearrangement Reactions of Heterocycles, VI The Reaction of Reactive Malonates with Benzalacetone and Cinnamoylaceton
Authors: Chirazi Ali M. , Brandner Alexander , Kappe Thomas
Published: March 2015

Trichlorophenylmalonates (1) react with benzalacetone (2) to give 4-hydroxy-6-styryl- 2-pyrones (3) and the isomeric 2:1 condensation products 4 and 5 which are interconvertable. Cinnamoylacetone (8) reacts at different temperatures to three isomeric pyrones (9, 10, and 11). Thermal rearrangement of 9 yields 10 and the latter compound at highter temperatures 11.
Synthesen von Heterocyclen, CCVII Mesoionische Pyrimidine und Thiazine / Syntheses of Heterocycles, CCVII Mesoionic Pyrimidines and Thiazines
Authors: Ziegler Erich , Steiger Wilfried , Strangas Charilaos
Published: March 2015

Benzanilidoxim-benzylether reacts with C3O2 in chlorobenzene yielding the pyrimidiniumolat 2. S-Alkyl-N,N′-diaryl-isoureas can be converted with C3O2 to 2-alkylthio-l-pyrimidinium-4-olates (3a-f). 2-Ethylthio-2-pyrazolin gives 8-ethyl-7-oxo-2,3-dihydro-7 H-imidazo[2,3-b][1,3]-thiazin-8-ium-5-olat (5a). Starting with O-alkyl-N,N′-disubstituted isoureas and C3O2 the corresponding 1-pyrimidinium-4-olates (6a—d) are obtained.
Beiträge zur Chemie des Phosphors, 761 Tricyclohexyl-cyclotriphosphan, Pentacyclohexyl-cyclopentaphosphan und 1.2.3.4-Tetracyclohexyl-cyclo-5-carba-1.2.3.4-tetraphosphan / Contributions to the Chemistry of Phosphorus, 761
Tricyclohexyl-cyclotriphosphane, Pentacyclohexyl-cyclopentaphosphane, and 1,2,3,4-Tetracyclohexyl-cyclo-5-carba-1,2,3,4-tetraphosphane
Authors: Baudler Marianne , Pinner Christian , Gruner Christian , Hellmann Jochen , Schwamborn Michael , Kloth Bernhard
Published: March 2015

Tricyclohexyl-cyclotriphosphane, (c-C6H11P)3 (1), is another relatively stable compound with a three membered phosphorus ring. It is produced in the reactions of (a) K2(c-C6H11P)4 with CH2Cl2, (b) K2(c-C6H11P)4 with CS2, (c) c-C6H11PCl2 with sodium in dioxane. The following by-products are formed: (c-C6H11P)4CH2 (3), (c-C6H11P)5 (2) and (c-C6H11P)4 in the reaction (a); mainly (c-C6H11P)4 in the reaction (b); (c-C6H11P)5 (2) and (c-C6H11P)4 in the reaction (c). The P3 ring compound 1 and the P5 ring compound 2 can be isolated in a pure state. The oligomers (c-C6H11P)n, n = 3, 4, 5, clearly are distinguished by the melting points, the molecular masses and by the 31P NMR and vibrational spectra. The 31P NMR parameters of 3 are reported. The cyclohexyl groups in 1, 2 and 3 are situated on both sides of the corresponding ring systems, giving rise to a maximum number of “trans” orientated neighboring substituents.
The Molecular Structure of Allenes and Ketenes, XI Semiempirical Calculations of 1H-Chemical Shifts of Allenes
Authors: Runge W.
Published: March 2015

A comparison between calculated and observed values demonstrates that “ansätze” derived from an algebraic model in connection with appropriate boundary conditions are able to account for a quantitative description of the proton chemical shifts of allenes.

Correlations of the proton chemical shifts with other NMR data, such as 13C-chemical shifts and one-bond carbon-proton coupling constants, reveal some insigths into the nature of the 1H substituent chemical shifts of alienes.
Über die Spaltung von O-Phenylcarbamoyl-salicylhydroxamsäure / Decomposition of O-Phenylcarbamoyl-salicylohydroxamic Acid
Authors: Zörkendörfer E.
Published: March 2015

Decomposition of O-phenylcarbamoyl-salicylohydroxamic acid (8 a) in various systems yields benzoxazolin-2-one (4 a), salicylohydroxamic acid (10 a), aniline (9 a), and carbanilide (11 a), what is explained by two reaction paths via two different isocyanate intermediates.
Notizen: Kristallstruktur einer Phosphor-Stickstoff-Verbindung mit zweifach koordiniertem, kationisch stabilisierten Phosphor / Crystal Structure of a Phosphorus-Nitrogen Compound with Two-Coordinate Cationic Phosphorus
Authors: Pohl Siegfried
Published: March 2015

The crystal structure of a phosphorusnitrogen compound with two-coordinate cationic phosphorus was determined from single crystal X-ray data. The structure of the molecule shows two very short P–N distances (161.4 pm) indicating 3pπ(P)— 2pπ(N) interaction between the phosphorus and the lone pairs of the nitrogen atoms. The N–P–N angle was found to be 97.4°.
Notizen: Effect of Ortho Substitution on the Aminolysis of Active Esters in Aprotic Solvents
Authors: Kómives T. , Márton A. F. , Dutka F. , Lów M. , Kisfaludy L.
Published: March 2015

Kinetics of the piperidinolysis of active esters of acetic acid in acetonitrile and chlorobenzene was investigated. The rate data show intramolecular catalysis for the aminolysis of 2-nitro- and 2-cyanophenyl esters, while reactions of 2,6-disubstituted compounds are hindered by steric inhibition.
Untersuchungen an Stickstoff-Brom-Verbindungen, IV / Studies on Nitrogen-Bromine Compounds, IV
Authors: Jabay Omar , Pritzkow Hans , Jander Jochen
Published: March 2015

The crystal and molecular structures of N-bromobenzamide (NBB), N-bromosuccinimide (NBS), and N,N-dibromobenzenesulfonamide (NBBS) were determined by X-ray structure analysis. The nitrogen atoms in NBB and NBS have a trigonal planar coordination (sp2) and the N—Br distances lie in the same range (1.82 A, 1.84 A). The N—Br distance in NBBS, where the nitrogen atom is sp3-hybridized, is somewhat longer (1.88 A). In these structures the molecules are connected by O···H—N (NBB), O···Br—N (NBS) or N···Br—N (NBBS) intermolecular bonds forming endless chains; positivated hydrogen atoms or, in case that they are absent, positivated bromine atoms act as electron acceptors with oxygen or sp3- hybridized nitrogen atoms. These results suggest, that in solid nitrogen tribromide, the crystal structure of which cannot be determined, the nitrogen atoms will be sp3-hybridized and intermolecular contacts via N—Br···N will occur.
Three-membered Rings. Molecular Structure and Conformation of Aryl Substituted Oxiranes by Dipole Moment Measurements
Authors: Sorriso Salvatore , Battistini Carlo , Macchia Bruno , Macchia Franco
Published: March 2015

The electric dipole moments of some styrene and trans- and cis-stilbene oxides have been measured, in benzene. From these data some bond angles have been calculated and it has been deduced that in the styrene derivatives the phenyl group is in rapid interconversion about the bond with the triatomic ring.
Darstellung und Struktur des KAu4Sn2 / Preparation and Crystal Structure of KAu4Sn2
Authors: Sinnen Heinz-Dieter , Schuster Hans-Uwe
Published: March 2015

In the course of our investigation of the ternary system K-Au-Sn we obtained the new compound KAu4Sn2. Its crystal structure has been determinated from single crystal X-ray diffraction data. It crystallizes in the tetragonal space group 1̅4̅c2 with unit-cell parameters a = 884.7 and c = 817.8 pm and Z = 4. The structure is comparable to that of the Tl2Se.
Bis[-µ-methyl-1.3-dimethyl-h3 -allyl-nickel] Struktur und Bindungsverhältnisse eines Alkyl-verbrückten Ni-Ni-Systems / Bis [-µ-methyl-1,3-dimethyl-h3 -allyl-nickel] The Bonding in an Alkyl-Bridged Ni-Ni System
Authors: Krüger Carl , Sekutowski Janine , Berke Heinz , Hoffmann Roald
Published: March 2015

The crystal structure of the diamagnetic title compound (1), a = 9.9594(9), b = 9.3895(7), c = 14.8434(8), β = 95.112(5) is described. Two co-ordinatively square planar nickel atoms each carrying a h3-C5H9 group are linked together by two methyl bridges, with the h3-C5H9 groups lying cisoid about the two nickel atoms. The molecule is folded about its centre so that the Ni-Ni distance is only 2.371, indicating a strong interaction within the unsaturated metal system. The bridging methyl groups form novel, slightly unsymmetrical two electron - three centre bonding systems. The electronic structure of 1 is analysed by MO methods. The nature of the nickel-nickel interaction as well as the stabilising factors of these unsaturated systems are explained. A discussion centred about one low energy LUMO leads
The Delayed Fluorescence of Indole in Alcohol-Alkane Mixed Glasses at 77 K
Authors: Yamashita Shozi , Tomita Giiti
Published: March 2015

Using a phosphoroscope and a pulsed light-signal integrator, the effect of alcohol on the delayed fluorescence of indole was investigated in alcohol-isopentane mixed glasses at 77 K. The delayed fluorescence intensity was strongly depended on the alcohol concen-tration and the polarity of alcohol. Trapped electrons causing the delayed fluorescence were separated into two species utilizing the scavenge effect of CCl4; shallow trapped-electrons sensitive to CCl4 and deep trapped-electrons insensitive to CCl4. The former electrons seem to be responsible for the delayed fluorescence at low alcohol concentrations, whereas the latter for the delayed fluorescence at higher alcohol concentrations. The delayed fluorescence decayed exponentially at low alcohol concentrations, but it decayed with the Debye-Edwards law of t-1 at higher alcohol concentrations. The recombination mechanism of trapped electrons with parent cations was discussed. The structure of shallow traps was also estimated.
Notizen: Eine einfache Synthese von Tetrahydroxybenzochinon-1.4 / A Simple Synthesis of Tetrahydroxy-benzoquinone- 1,4
Authors: Junek Hans , Unter Bernd , Peltzmann Regina
Published: March 2015

Tetrahydroxy-benzoquinone-1.4, Tetraalkoxy-benzoquinones-1.4 Hydrolysis of easy available tetramethoxy-benzoquinone-1,4 leads to tetrahydroxy-benzo-quinone-1,4 in good yield. Tetramethoxy-benzo-quinone is obtained by a modified method from tetrachlorobenzoquinone. It is subsequently used for the synthesis of higher alkoxy-benzo-quinones-1,4.
Neues über ternäre Interalkalimetalloxide und Alkalithallium(I)-oxide / News About Ternary Inter Alkaline Metal Oxides and Alkalinethallium(I)oxides
Authors: Sabrowsky Horst , Mertens Petra , Dönhoff Fritz Otto
Published: March 2015

Besides KNaO and RbNaO, KLiO is the third example of hitherto unknown and unexpected in- teralkaline metal oxides. The X-ray investigation of the orthorhombic KLiO (Z=8) shows a new structure with separated layers of [xxx] anions in which every lithium atom is co-ordinated by a triangle of three oxygens.

The compounds KTlO, RbTlO and CsTlO are already known. Now serveral new ternary alkaline oxides with monovalent thallium have been obtained. In the Na2O-Tl2O system the red compounds NaTlO and Na3TlO2 were found. Further- more KTl3O2, RbTl3O2 and CsTl3O2 have been prepared. Their unit cells (Z=3) correlate to the unit cell of hexagonal Tl2O (Z=6)
Notizen: The Isolation and Structure of “Papilinine” a New Alkaloid from Buxus papilosa
Authors: Atta-ur-Rahman  , Nisa Mehrun , Zamir Talat
Published: March 2015

A new alkaloid “Papilininc” has been isolated from the leaves of Buxus papilosa to which structure 1 has been assigned.
Synthese neuer Phosphan-Nickel(I)-KompIexe und Kristallstruktur von μ3–Iodo-tris-μ-iodo-cyclotris(triphenylphosphan-nickel), (TPP)3Ni3I4 / Synthesis of New Phosphine Nickel(I) Complexes and Crystal Structure of μ3-Iodo-tris-μ-iodo-cyclotris(triphenylphosphine Nickel), (TPP)3Ni3I4
Authors: Hoberg Heinz , Radine Klaus , Krüger Carl , Romão Maria J.
Published: March 2015

Synthesis and properties of the new nickel(I) complexes (COD)Ni(TPP)I (3) and (TCP)Nil (5) are reported. Reaction of 3 and 5 with diphenylacetylene (7) yields alkyne complexes (R3P)NiI(PhC2Ph)Ni(R3P)I (R = Ph (8a), and Cy (8b)). In solution, 3 disproportionates to give nickel(O) and (TPP)3Ni3I4 (12)), the structure of which has been determined by X-ray crystallography. Cluster compound 12 is cleaved into monomeric units by addition of ligands such as TPP or CO (TPP = triphenylphosphine, TCP = tricyclohexylphosphine, COD = 1,5-cyclooctadiene).
Trimethoxyphenylverbindungen, X [1]. Inhaltsstoffe von Hagenia abyssinica, 1: Isolierung von Kosinen und Strukturaufklärung einkerniger Phloracylophenone [2] / Trimethoxyphenyl Compounds, X [1]. Constituents of Hagenia abyssinica, 1: Isolation of Kosins and Structure Elucidation of Phloracylophenones Containing One Phloroglucinol Unit [2]
Authors: Schiemenz Günter Paulus , Schröder Jens-Michael
Published: March 2015

From Hagenia abyssinica, 26 compounds were isolated, mostly phloracylophenones with one to three phloroglucinol units. The structure elucidation of three phloracylophenones with one phloroglucinol unit is described.
Trimethoxyphenylverbindungen, XI [1]. Inhaltsstoffe von Hagenia abyssinica, 2: Synthese einkerniger Phloracylophenone / Trimethoxyphenyl Compounds, XI [1]. Constituents of Hagenia abyssinica, 2: Synthesis of Phloracylophenones Containing One Phloroglucinol Unit
Authors: Schiemenz Günter Paulus , Behrens Heinz , Ebert Claus Peter , Maienschein Konrad , Schröder Jens-Michael
Published: March 2015

For the Koso constituents K6 and K8, we previously proposed the structures 1a, b and 2a, b [1]. These assignments have been confirmed by synthesis.
Monogagaine, a Novel Dimeric Indole Alkaloid from Tabernaemontana chippii and Tabernaemontana dichotoma [1]
Authors: Beek Teris A. van , Lankhorst Peter P. , Verpoorte Robert , Massiot Georges , Fokkens Roel , Erkelens Cornelis , Perera Premila , Tibell Cecilia
Published: March 2015

From the rootbark of Tabernaemontana chippii and the stembark of T. dichotoma a novel dimeric indole alkaloid was isolated which was named monogagaine. It was assigned structure 1 on the basis of spectral data. It showed antimicrobial activity against Bacillus subtilis.
1.1.3.3-Tetrakis(dimethylamino)-1λ5,3λ5-diphosphet / 1.1.3.3-Tetrakis(dimethylamino)-1λ5,3λ5-diphosphete
Authors: Svara Jürgen , Fluck Ekkehard , Riffel Heinz
Published: March 2015

The title compound 1 was prepared by reacting methyl-bis(dimethylamino)difluorophosphorane with butyllithium at -95 °C. The crystalline product is characterized by its NMR and IR spectra. The results of the X-ray crystal and molecular structure analyses are reported.
Dimethylantimonazid: Synthese, Spektren und Kristallstruktur Dimethylbismutazid: Synthese und Kristallstruktur Trimethylbleiazid: Verfeinerung der Kristallstruktur / Dimethyl Antimony Azide: Preparation, Spectra and Crystal Structure Dimethyl Bismut Azide: Synthesis and Crystal Structure Trimethyl Lead Azide: Refinem ent of the Crystal Structure
Authors: Müller Joachim , Müller Ulrich , Loss Almuth , Lorberth Jörg , Donath Harald , Massa Werner
Published: March 2015

Reaction of Me2SbBr or Et2SbBr with AgN3 in ether affords Me2SbN3 and Et:SbN3. respectively. Me2SbN3 can also be obtained from Me2SbNMe2 and HN3 in ether. Me2BiN3 from Me2BiN(SiMe3)3 and HN3 in ether. Me2SbN3 and Et2SbN3 dissolve as monomers in benzene; 1H, 13C, iaN and 15N NMR spectra of the solutions are reported. IR and Raman spectra of solid Me2SbN3 and Et2SbN, as well as the mass spectrum of Me2SbN3 are assigned. The crystal structures of Me2SbN3 and Me2BiN3 were determined by X-ray diffraction data collected at -67 °C (888 and 439 reflexions, R = 0.024 and 0.076. respectively). Both compounds are isotypic, space group Pnma. Z = 4. Crystal data: Me2SbN3, a = 843.6. b = 919.3, c = 744.1 pm: Me2BiN3, a - 870.8. b = 911.3, c = 738.4 pm. In the crystals, the metal atoms are linked via the aN atoms of the azido groups to form endless zig-zag chains. Whereas the Bi -N distances are equal. Sb-N bonds alternate with two different lengths (232 and 243 pm). Including the lone pair of electrons, the metal coordination can be described as distorted trigonal bipyramidal, with nitrogen atoms occupying the apical positions. With new X-ray diffraction data collected at -100 °C, the crystal structure of Me3PbN3 was refined (1692 reflexions, R = 0.036). Crystal data: a = 656.3, c = 1377 pm. space group P3221, Z = 3. It consists of endless metal-nitrogen chains of helical symmetry. the Pb atoms having trigonal bipyramidal coordination.
N,N,N′,N′,N′,N″,N‴,N‴-Octamethyl-[bi-2,4,6-cycloheptatrien-1-yl]- 3,3′-dicarboxamidinium-Salze: Struktur der meso-Verbindung in Lösung und im Kristall [1] / N,N,N′,N′,N′,N″,N‴,N‴-Octamethyl-[bi-2,4,6-cycloheptatriene-1-yl]- 3,3′-dicarboxamidinium Salts: Structure of the meso-Compound in Solution and in Solid State [1]
Authors: Daub Jörg , Hasenhündl Adelheid , Salbeck Erika , Gieren Alfred , Hübner Thomas
Published: March 2015

3,3′-Bicycloheptatrienylamidinium salts 3 have been prepared by oxidative dimerization of 8 ,8 -bis(dimethylamino)heptafulvene (1). An X-ray structure analysis of the meso-octamethyl[bi-2,4,6-cycloheptatrienyl]3,3'-dicarboxamidinium-bis(triiodide) (3b) has been carried out. The dication 3 is centrosymmetric (Ci-symmetry) with boat shaped cycloheptatriene rings. The amidinium groups are twisted out of the plane of the C3(C3′)-C2(C2′) double bonds. The structure of the dication in the solid state is discussed in comparison with the structure in solution by aid of 1H NMR techniques. The N-methyls within one amidinium group show temperature dependent 1H NMR spectra and are chemically nonequivalent (anisochronous).
Studien zum Vorgang der Wasserstoffübertragung, 78 [1]. Untersuchungen zur Charakterisierung des im Raney-Nickel (Ra-Ni) gebundenen Wasserstoffs / Studies on the Occurrence of Hydrogentransfer, 78 [1]. Investigations for the Characterization of the Hydrogen Present in Raney-Nickel (Ra-Ni)
Authors: Horner L. , Kaps U.
Published: March 2015

Hydride supported alloys Mg2Ni (A), CaNi5 (B) and FeTi (C) are in contrast to Ra-Ni unable for the catalytic hydrogenation and the hydrogenolysis of sulfur compounds. The origin and quality of the “structure bonded hydrogen” in Ra-Ni is still speculative.
Neue ternäre Alkaliphosphide mit Kupfer, Zink und Cadmium: K2CuP, NaZnP und K4CdP2 / On New Ternary Alkali Metal Phosphides: K2CuP, NaZnP and K4CdP2
Authors: Eisenmann Brigitte , Somer Mehmet
Published: March 2015

The new compounds K2CuP, NaZnP and K4CdP2 have been prepared and structurally charac­terized. The crystallographic data are:

K2CuP: orthorhombic, space group Cmcm (No. 63). Na2CuAs structure type with a = 983.9(5) pm. b = 739.7(4) pm, c = 579.5(3) pm. There are CuP2- zigzag chains, which are isosteric to the chains in HgO.

NaZnP: tetragonal, space group P4/nmm (No. 129). PbFCl structure type with a = 406.6(2) pm. c = 689.3(3) pm, c/a = 1.695.

K4CdP2: monoclinic, space group C2/m (No. 12). New structure type with a = 984.0(5) pm, b = 568.1(3) pm. c = 957.5(5) pm. β = 110.0(1)°. There are discrete [P−Cu−P]4- anions, which are isosteric to the HgCl2 molecules.
Beiträge zur Chemie des Phosphors, 161 [1] Kernresonanzspektren und Struktur von Heptaphosphan(3), P7H3 / Contributions to the Chemistry of Phosphorus, 161 [1] NMR Spectra and Structure of Heptaphosphane(3), P7H3
Authors: Bäudler Marianne , Riekehof-Böhmer Renate
Published: March 2015

Heptaphosphane(3) (1) is obtained pure by the reaction of (Me3Si)3P7 with methanol and has been characterized NMR spectroscopically (in nascent state). It turned out to be a mixture of two diastereomers P7H3sym and P7H3asym, which differ in the spatial arrangement of the hydrogen atoms. Both isomers were proven to possess the earlier reported structure of a tri-cyclo[2.2.1.02,6]heptaphosphane, which in the case of P7H3sym was ascertained by a complete analysis of its 31P{1H} NMR spectrum. As shown by the chemical shifts, the P7 cage in P7H3sym is clearly stretched compared with P7Me3sym and (Me3Si)3P7.
Darstellung, Kristallstruktur und spektroskopische Daten von Rb2VOF4 / Preparation, Crystal Structure and Spectroscopic Data of Rb2VOF4
Authors: Schabert Martin , Pausewang Gerhardt
Published: March 2015

Crystals of Rb2VOF4 have been obtained under hydrothermal conditions. The crystal structure (orthorhombic, space group Pnma, a = 759.9(2) pm. b = 579.1(2) pm, c = 1193.8(4) pm, Z = 4, dc = 3.96 gcm-3, dm = 3.90 gcm-3, R = 0.019 for 655 independent reflections) shows infinite zig-­zag-chains of VOF5-octahedra along the b-axis, linked by cis-bridging F-atoms. Despite of orien­tational disorder, clear evidence for a trans-effect could be established: d(V−O) 165.8(2), d(V−Ftrans brjdge) 221.1(1), d(V−Fcis bridge) 203.6(1), d(V-Fterminal) 185.2(2), 187.8(2), 193.2(2) pm.
Monomere [Bis(diphenylphosphino)methan]platin-acetylid-Komplexe [1] / Monomeric [Bis(diphenylphosphino)methan]platinum Acetylide Complexes [1]
Authors: Sebald Angelika , Wrackmeyer Bernd
Published: March 2015

The reaction of [dppmPtCl2] (dppm = bis(diphenylphosphino)methane) with bis(alkynyl)-dimethylstannanes leads to monomeric complexes [dppmPt(C≡C−R)2], 2 (R = H, CH3, C4H9
t, C6H5) in >90% yield. Rearrangement of 2 into the dimeric complexes 3, trans,trans- [Pt2(C≡C−R)4(dppm)2] is catalyzed by traces of various phosphanes. All products are characterized by 1H, 13C, 31P and 195Pt NMR spectroscopy.
On the Reaction Products of Some Aldoses with Secondary Aliphatic Aromatic Amines
Authors: Kolka Stefania
Published: March 2015

Reactions of L-arabinose, D-xylose. D-galactose and D-glucose with N-methylaniline and its p-methyl and p-methoxy derivatives were studied in methanol, in the presence and absence of an acidic catalyst, by employing the thin-layer chromatographic technique. Appropriate N-aryl- N-methyl-N-glycopyranosylamines found in the products underwent rapid transformations in the reaction medium.
Spin Labeled Chelating Agents and their Gadolinium Complexes as Contrast Enhancing Agents for NMR Imaging
Authors: Sosnovsky George , Li Shu Wen , Maheswara Rao N. Uma , Brasch Robert C.
Published: March 2015

Spin labeled EDTA, CDTA and DTPA chelating agents and their gadolinium complexes were synthesized and evaluated for their effects on the spin-lattice (T1) and spin-spin (T2) relaxation times of water, plasma, and blood. It was found that the spin labeled chelating agents are effective proton relaxation agents. Although, the gadolinium complexes of these agents have superior relaxation properties, the differences in relaxivitv between the spin labeled complexes and the non-spin labeled gadolinium complexes are marginal. The spin labeled agents and their gadolinium complexes are expected to be very useful in designing paramagnetic conjugates with biomolecules. In particular, the latter type possesses high proton relaxivity combined with a nitroxvl marker which can be followed pharmacokinetically by EPR.
Anwendungen der Phasentransfer-Katalyse, 33 [1] Zur Extraktion von Peroxosulfaten in organische Medien und zur oxidativen Phenolkopplung durch Peroxodisulfat / Applications of Phase Transfer Catalysis, 33 [1 ] On the Extraction of Peroxosulfates into Organic Media and on the Oxidative Phenol Coupling by Peroxodisulfate
Authors: Dehmlow Eckehard V. , Vehre Burkhard , Makrandi Jagdish K.
Published: March 2015

Salts of the types (NR4)2S2O8 and NR4HSO5 can be prepared easily by ion pair extraction. The lipophilicity of persulfate anions is classified. Phase transfer catalyzed peroxodisulfate oxidation of 2,6- disubstituted phenols yields diphenoquinones.
Cyclothiazeno-oxo-diazidowoIframat(VI) Die Kristallstruktur von (AsPh4)2[W(N3S2)(O)(N3)2]2 / Cyclothiazeno Oxodiazidotungstate(VI) The Crystal Structure of (AsPh4)2[W(N3S2)(O)(N3)2]2
Authors: Wadle Heribert , Conradi Elke , Müller Ulrich , Dehnicke Kurt
Published: March 2015

A new, improved method of synthesis for the cyclothiazeno complex AsPh4[WCl4(N3S2)] consists of the reaction of Na2WO4 with molten trithiazyl chloride (NSCl)3 followed by treatment with AsPh4Cl in CH2C12. Through the reaction with silver azide suspended in CH2C12 in the presence of moisture, black crystalline (AsPh4)2[W(N3S2)(O)(N3)2]2 is obtained. Its IR spectrum and its crystal structure are reported. Crystal data: triclinic, space group P1̄, Z = 1, a - 1018.3, b = 1107.8, c = 1379.1 pm; a = 91.11°, β = 106.74°, γ = 113.91°. Structure determination with 3219 observed reflexions, R = 0.061. The structure consists of AsPh4
+ cations arranged to form (AsPh4
+)2 pairs and of dimeric anions [W(N3S2)(O)(N3)2]2⊖ in which the tungsten atom s are members of planar cyclothiazeno rings WN3S2 with WN bond lengths of 186 and 222 pm. The oxygen atoms are in positions trans to the longer of these bonds. One of the N atoms of each cyclothiazeno ring is involved in the dimerization resulting in a centrosymmetric W2N2 ring. The azido groups are situated above and below the ring system and complete the coordination number of six for the W atoms with WN distances of 208 and 212 pm
Radical Cation Salts of an Unsymmetrical BEDT-TTF Derivative: Molecular Structure and Physical Properties of (DIMET*)2CIO4 X THF
Authors: Heid R. , Endres H. , Keller H. J.
Published: March 2015

4.5-Dimethyl-4'.5'-ethylenedithiolotetrathiafulvalene (DIMET) was obtained by reacting 4.5- ethylenedithiolo-1.3-dithioliumtetrafluoroborate with 4.5-dimethyl- 1.3-dithiolium-tetrafluoroborate in the presence of diisopropylethylamine or triethylamine. Electrocrystallization of this donor in different solvents like dichloromethane or tetrahydrofurane (THF) and with varying supporting electrolytes, like tetrabutylammonium hexafluorophosphate, triiodide, nitrate, perrhenate or perchlorate, results in a large number of well crystallizing compounds. The crystal and molecular structure of one of the isolated solids was elucidated by X-ray methods.

(C10)H10S6)2CIO4 x C4H8O, Mr = 816.66, is triclinic, P1̄ , a = 6.731(5), b - 7.632(3), c = 33.32(3) Å , α = 96.53(5), β = 92.99(6), γ = 103.13(5)°, V - 1650.7 Å3, Z = 2, dc = 1.64 gem-3, final Rw = 0.077 for 1844 observed independent reflections. Sheets of cations with an average charge of 1/2+ are separated by sheets of anions and THF solvent molecules. Intermolecular S···S contacts result in two-dimensional physical properties. Electrical conductivity and thermopower measurements indicate two broad phase transitions at around 200 K and 80 K
Neuartige Cerebroside aus Cystobacter fuscus (Myxobacterales) [1] / Novel Cerebrosides from Cystobacter fuscus (Myxobacterales) [1]
Authors: Dill D. , Eckau H. , Budzikiewicz H.
Published: March 2015

From the cell material of Cystobacter fuscus (Myxobacterales) the cerebroside 1-O-β-D-galactopyranosyl- N-(2R-hydroxy-15-methylpalmitoyl)-17-methylsphinga-4E,8E-dienin (main component) and three related compounds could be isolated, the structure elucidation of which is being reported here
Gestational Age and Developmental Risk in Moderately and Late Preterm and Early Term Infants
Authors: Schonhaut Luisa , Armijo Iván , Pérez Marcela
Published: March 2015

OBJECTIVES:

The objective of this study was to evaluate the association between gestational age (GA) at birth and risk of developmental delay at 8 and 18 months of corrected postnatal age.

METHODS:

During 2008 to 2011, infants at a corrected postnatal age of 8 or 18 months attending health centers in Santiago, Chile, were recruited. Participants completed a form on biographical and demographic characteristics and the Chilean validated version of the Ages and Stages Questionnaires, Third Edition (ASQ). Logistic regression was used to detect the capacity of GA to predict scores < −2 SDs on the basis of the Chilean ASQ reference group, in at least 1 ASQ domain, adjusted by different control variables.

RESULTS:

A total of 1667 infants were included in the analysis. An inverse “dose response” relationship between developmental delay risk and GA at birth was found, both in the crude and adjusted models. Compared with those born full term, the odds ratio for developmental delay risk was 1.56 for those born early term (95% confidence interval [CI]: 1.19–2.06), 2.58 for infants born late preterm (95%CI: 1.66–4.01), and 3.01 for those born moderately preterm (95%CI: 1.59–5.71).

CONCLUSIONS:

An inverse dose-response relationship between GA and risk of developmental delay was found in the tested population. Future prospective studies and predictive models are needed to understand whether this higher developmental risk in moderately and late preterm infants is transient and modifiable or persists throughout life, allowing for better targeting of early-intervention strategies.