bluuebunny/crossref_metadata_2025 huggingface dataset:
Smectogenic Behaviour of 7O.6 at it's Phase Transition Temperature: A Computational Analysis Reprint request to
Authors: Prasad Ojha Durga , Kumar Devesh , Pisipati V. G. K. M.
Published: February 2015

A computational analysis has been carried out to determine the configurational preference of a pair of Ar-(4-n-heptyloxybenzylidine)-4-hexylaniline (70.6) molecules with respect to translatory and orien­ tational motions. The CNDO/2 method has been employed to evaluate the net atomic charge and atom ic dipole components at each atomic centre of the molecule. The configurational energy has been com­ puted using the modified Rayleigh-Schrödinger perturbation method. The obtained energies were used to calculate the probability of each configuration at phase transition temperature, using Maxwell-Boltz-mann's formula. The flexibility of various configurations has been studied in terms of variations of the probability due to small departures from the most probable configuration. The results are discussed in the light of experimental as well as other theoretical observations. The smectogenic character of the molecule has been correlated with the parameters introduced in this paper.
Quantum Multi-object Search Algorithm with the Availability of Partial Information
Authors: Chen Goong , Diao Zijian
Published: February 2015

Consider the unstructured search of an unknown number I of items in a large unsorted database of size N. The multi-object quantum search algorithm consists of two parts. The first part of the algorithm is to generalize Grover's single-object search algorithm to the multi-object case, and the second part is to solve a counting problem to determine l. In this paper we study the multi-object quantum search algorithm (in continuous time), but in a more structured way by taking into account the availability of partial information. The modeling of available partial information is done simply by the combination of several pre­scribed, possibly overlapping, information sets with varying weights to signify the reliability of each set. The associated statistics is estimated and the algorithm efficiency and complexity are analyzed. Our analysis shows that the search described here may not be more efficient than the unstructured (generalized) multi-object Grover search if there is "misplaced confidence". However, if the information sets have a "basic confidence" property in the sense that each information set contains at least one search item, then a quadratic speedup holds on a much smaller data space, which further expedites the quantum search for the first item.
Gamma-Ray Bursters and Lorentzian Relativity
Authors: Winterberg F.
Published: February 2015

In the dynamic interpretation of relatively by Lorentz and Poincare, Lorentz invariance results from real physical contractions of measuring rods and slower going clocks in absolute motion against an ether. As it was shown by Thirring, this different interpretation of special relativity can be extended to general relativity, replacing the non-Euclidean with a Euclidean geometry, but where rods are contracted and clocks slowed down. In this dynamic interpretation of the special, (and by implication of the general) theory of relativity, there is a balance of forces which might be destroyed near the Planck energy, reached in approaching the event horizon. In gravitational collapse, the event horizon appears first at the center of the collapsing body, thereafter moving radially outward. If the balance of forces holding together elementary particles is destroyed near the event horizon, all matter would be converted into zero rest mass particles which could explain the large energy release of gamma ray bursters.
Darstellung und Charakterisierung von Spezies der Zusammensetzung η5-C5H5Cr(NO)2SR (R = C6H5, C6F5, t–C4H9) und [η5-C5H5CrNO]2(ER)2 (E = O, S, Se, Te, R = Alkyl, Aryl); Röntgenstrukturanalysen von [η5-C5H5(NO)Cr(μ-SeC6H5)2Cr(NO)-η5-C5H5] und [η5-C5H5(NO)Cr(μ-Se-n-C4H9)(μ-OH)Cr(NO)-η5-C5H5] / Synthesis and Characterization of Species of Composition η5-C5H5Cr(NO)2SR (R = C6H5, C6F5, t-C4H9) and [η5-C5H5CrNO]2(ER)2 (E = O, S, Se, Te, R = Alkyl, Aryl); Röntgenstrukturanalysen von [η5-C5H5(NO)Cr(μ-SeC6H5)2Cr(NO)-η5-C5H5] and [η5-C5H5(NO)Cr(μ-Se-n-C4H9)(μ-OH)Cr(NO)-η5-C5H5]
Authors: Rott Johannes , Guggolz Ernst , Rettenmeier Albert , Ziegler Manfred L.
Published: February 2015

The title compounds have been synthesized and characterized by elemental analysis, IR and 1H NMR methods and mass spectra. The crystal and molecular structures of the binuclear complexes [η-C5H5(NO)Cr(μ-SeC6H5)2Cr(NO)-η5-C5H5] and [η5-C5H5(NO)Crμ-Se-n-C4H9)(μ-OH)Cr(NO)-μ5-C5H5] have been determined by X-ray structure analysis. The latter is shown to have a four-membered ring consisting of two chromium atoms, one selenium, and one oxygen atom.
31P-NMR-Untersuchungen an linearen Phosphorylphosphazenen / 31P NMR Investigations oil Linear Phosphorylphosphazenes
Authors: Schilling Gerhard , Rabener Claus W. , Lehr Wendel
Published: February 2015

The 31P NMR Spectra of PCl3NPCl2O (1) and the homologous compounds 2-4 do not indicate any rotational isomers in the temperature range 183-413 K. The observed values for ν/2 depend on the viscosity of the solvent and on the temperature of the sample. They are reduced to T1 relaxation effects, where the spin rotational mechanism may be dominant in the case of the small molecules and the PCl3 group.
Reaktionen von Mehrfachbindungssystemen mit dem 1.2.4-Trithia-3.5-diborolan-Ring / Reactions of Multiple Bond Systems with the 1,2,4-Trithia-3.5-diborolane Ring
Authors: Habben Carl , Maringgele Walter , Meiler Anton
Published: February 2015

3,5-Dibromo-1,2,4-trithia-3,5-diborolane reacts with alkynes to give ⊿4-2-bromo-1,3,2- dithiaborolenes. As a by-product in the reaction to form ⊿4-2-bromo-4-phenyl-1,3,2-dithiaborolene the ⊿2,5-4-bromo-2,6-diphenyl-l,4-thiaboracyclohexadiene is formed. Vinyltrimethylsilane reacts with 3,5-dimethyl-1,2,4-trithia-3,5-diborolane to yield the 2-methyl-4- trimethylsilyl-1,3,2-dithiaborolane. The bromine atom in these compounds can be substituted by lithium alkyls, by secondary as well as lithiated primary amines or by lithiohexamethyldisilazane. Starting from ⊿4-2-<-butylamino-4-phenyl-1,3,2-dithiaborolene and heterocycles containing boron bromine functions, diborylamines are obtained. Isocyanates and di-i-propylcarbodiimide, respectively, react with 3,5-dimethyl-1,2,4-trithia-3,5-diborolane by formation of 5-methyl-1,4-dithia-2-azacyclopentanethiones(3) or of -pentanones(3). 3,5-Dimethyl-1,2,4-trithia-3,5-diborolane reacts with o-acetylaminophenole to give 3-acetyl-2-methyi-4,5-benzo-l-oxa-3-aza-2-boracyclopentane. 1H, 11B, 13C NMR, mass and IR spectra are reported.
ÜbergangsmetaU-Schwefelylid-Komplexe, XII [1]. η5-Thiacyclohexadienyl-l-oxid als Ligand in neutralen Halogenomolybdän- und Halogenowolframkomplexen / Transition Metal Sulfur Ylide Complexes, XII [1]. η5-Thiacyclohexadienyl-l-oxide as a Ligand in Neutral Halide Complexes of Molybdenum and Tungsten
Authors: Weber Lothar , Wewers Dietmar
Published: February 2015

The organometallic anion in tetraethylammonium-tricarbonyl(3,5-diphenylthiacyclohexadienyl-1-oxide )molybdate and its tungsten analogue can be halogenated by treatment with iodine, C5H5N·Br2, and I,I-dichloroiodobenzene to yield neutral [η5-C5H3(C6H5)2SO]M(CO)3X complexes (M=Mo, W; X=Cl, Br, I).
Chemie polyfunktioneller Liganden, 67 [1]. Die Darstellung von 1.1.1-Tris(dichlorarsinomethyl)ethan, Ethan-1.1.1-tris(methylarsonsäure), 1.1.1- Tris (arsinomethyl )ethan und einem neuen Organocyclotriarsan / Chemistry of Polyfunctional Ligands, 67 [1] The Preparation of 1.1.1-Tris(dichloroarsinomethyl)ethane, Ethane-1.1.1-tris(methylarsonic acid), 1.1.1-Tris(arsinomethyl)ethane and of a New Organocyclotriarsane
Authors: Eilermann Jochen , Lietz Martin
Published: February 2015

1,1,1-Tris(dichlorarsinomethyl)ethane, CH3C(CH2AsCl2)3 (5) can be obtained in the reaction of CH3C(CH2AsNC6H4CH3)3 (4) with gaseous HCl. The heteroadamantane CH3C(CH2AsO)3 (6) reacts with AsCl3 or PCl3 yielding also 5. CH3C(CH2AsO)3, CH3C(CH2AsS)3 and CH3C(CH2AsI2)3 are oxidized with H2O2 to give CH3C[CH2As(O)(OH)2]3 (7) and CH3C[CH2As(O)(OH)2]3·H2O (7 a). CH3C(CH2AsI2)3 and C(CH2AsI2)4 can be reduced with LiAlH4 to give CH3C(CH2AsH2)3 (9) and C(CH2AsH2)4 (12). Oxidation of 9 and 12 leads to the cyclotriarsane compounds CH3C(CH2As)3 (10) and H2AsCH2C(CH2As)3 (13).
Trimethylsilylverbindungen der Vb-Elemente, HI [1]. Tris(trimethylsilyl)- und Tris(trimethylstannyl)bismutan sowie Tetrakis(trimethylsilyl)dibismutan / Trimethylsilyl Derivatives of Vb-Elements, III [1]. Tris(trimethylsilyl)- and Tris(trimethylstannyl)bismuthine as well as Tetrakis(trimethylsilyl)dibismuthine
Authors: Becker Gerd , Rößler Michael
Published: February 2015

Chlorotrimethylsilane and sodium/potassium bismuthide, easily prepared from finely powdered bismuth and sodium potassium alloy in 1,2-dimethoxyethane (DME), react to give tris(trimethylsilyl)bismuthine (1) in 48% yield. When compound 1 is treated with chlorotrimethylstannane all trimethylsilyl substituents are successively replaced by stannyl groups, and tris(trimethylstannyl)bismuthine (4) is obtained. As in analogous reactions of other tris(trimethylsilyl) derivatives of Vb-elements with methyl lithium in diethylether/tetrahydrofuran (THF), one trimethylsilyl group of tris (trimethylsilyl)-bismuthine (1) can also be removed, and lithium bis(trimethylsilyl)bismuthide · 2 THF (5) is formed. With 1,2-dibromoethane bismuthide 6 reacts with metal halogen exchange to give green lustrous needles of tetrakis(trimethylsilyl)dibismuthine (6). In contrast to other dibismuthines described in the literature, this compound is thermally rather stable and can be isolated in preparative amounts. Similar to several distibines a colour change from green to red, resp. orange-red occurs on melting or dissolving dibismuthine 6 in organic solvents.
Elektrochemisches Verhalten der Nitrophenole und ihrer Reduktionsprodukte an Graphitelektroden, II Mechanismus und Kinetik / Electrochemical Behavior of the Nitrophenols and their Reduction Products at Graphite Electrodes, II Mechanism and Kinetic
Authors: Theodoridou Elli , Karabinas Pantelis , Jannakoudakis Dimitrios
Published: February 2015

The mechanism of the electrochemical reactions of 1-nitro-2-naphthol, o-nitrophenol and p-nitrophenol at carbon fibre electrodes is investigated in aqueous solutions with pH= 1-10. The above nitrophenols are reduced to the corresponding amines, which are reoxidized to quinone imines. As the quinone imines are partially hydrolysed to quinones, the kinetic of this hydrolysis reaction is also examined.

In the case of 1-nitro-2-naphthol the hydrolysis rate constant of 1,2-naphthoquinone imine is estimated as a function of pH by cyclic voltammetry.
Cyanato - Kupfer (II) - Komplexe mit organischen Liganden, XX [1]. ESR- und magnetische Untersuchung des Dicyanato-bis(pyridin)kupfer(II)-Komplexes / Cyanato-Copper(II) Complexes with Organic Ligands, XX [1]. ESR and Magnetic Study of Dicyanato-bis(pyridine)copper(II)
Authors: Kohout Jiří , Mroziński Jerzy , Hvastijová Mária
Published: February 2015

The ESR spectra and the temperature dependence of the magnetic susceptibility of Cu(NCO)2(pyridine)2 were measured. The ESR spectrum at room temperature shows a single reversed line; at -130 °C it is isotropic. The susceptibility down to 4.2 K obeys the Curie-Weiss law with a small θ value. These results are interpreted on the basis of the known crystal and molecular structure.
Eine Methode zur C-Methylierung cyclischer β-Dicarbonyl-Verbindungen / A Method for the C-Methylation of Cyclic β-Dicarbonyl Compounds
Authors: Ziegler Erich , Wolfbeis Otto S. , Trummer Iris
Published: February 2015

Cyclic β-dicarbonyl compounds (1,4,7,10) were reacted with either aniline or urea in the presence of trimethoxymethane to give the enamines 2, 5, 8 and 11, resp. The latter were reduced with hydrogen over palladium-charcoal or with the dimethylamine-boron-hydride complex to give the C-methylated β-dicarbonyl compounds 3,6,9 and 12, resp. in moderatly to good overall yields.
Stereoselektive 1.4-Ringöffnung von 1-Aryl-4-methylthio-2-azetidinonen / Stereoselective 1,4-Ringopening of 1-Aryl-4-methylthio-2-azetidinones
Authors: Ongania Karl-Hans
Published: February 2015

The 4-methylthio-2-azetidinones 1a-d react with lithiumiodide/pyridine by stereoselective 1,4-ringopening to the E/Z 3-methylthioprope-noicacid anilides 2b-e. The attempted selective O-alkyl cleavage 1a→1e failed.
Ein Beitrag zur photoinduzierten Desaminierung substituierter 1.2.4-Triazinone / A Contribution to the Photoinduced Desamination of 1,2,4-Triazinones
Authors: Herrmann M. , Parlar H. , Körte F.
Published: February 2015

Solution-phase photoreactions of 4-amino-substituted 1,2,4-triazin-5(4H)-ones (1a-j) in different solvents using UV light with wavelengths greater than 290 nm have been investigated. The results show, that the desamination reaction is influenced by both oxygen and water. The photoexperiments showed clearly that OOH-radicals take part in the first step of reaction.
Neue Ga-Cluster-Verbände im Na7Ga13-II / New Ga-Cluster Compounds: The Structure of Na7Ga13-II
Authors: Frank-Cordier Ursula , Cordier Gerhard , Schäfer Herbert
Published: February 2015

Na7Ga13-II crystallizes in the orthorhombic system, space group Pnma with the constants

a - 1562.5(3) pm, b = 1497.9(3) pm, c = 2167.8(4) pm. The Ga-atoms form Gaj.2 icosahedra and Gais clusters connected to a threedimensional network. The centres of these clusters correspond to the atomic positions of the MgCu2 structure. The number of bonding electrons is related to the Na content of the compound
Darstellung und Kristallstruktur vom Arsen(III)arsen(V)oxidhydroxid As3O5(0H) / Preparation and Crystal Structure of the Arsenic(III) Arsenic(V) Oxide Hydroxide As3O5(OH)
Authors: Bodenstein Doris , Brehm Axel , Jones Peter G. , Schwarzmann Einhard , Sheldrick George M.
Published: February 2015

The title compound was prepared by heating the hydrolysis products of AS2O4 in a sealed tube. The crystal structure was determined and refined to R = 0.058 [P21/c, a = 1250.4(6), b = 459.3(2), c = 1097.6(6) pm, β = 118.08(5)°, Z = 4]. The structure consists of infinite layers, containing pyramidal As(III)O3 and tetrahedral As(V)O4 groups, and stabilised by hydrogen bonding
Kristallstruktur der sulfidverbrückten Gold(I)verbindung [Au{S(AuPPh3)2}2]+ [(CH3)3SnCl2]— / Crystal Structure of the Sulphide-bridged Gold(I) Complex [Au{S(AuPPh3)2}2]+[(CH3)3SnCl2]–
Authors: Jones Peter G. , Lensch Corneha , Sheldrick George M.
Published: February 2015

The compound [Au{S(AuPPh3)2}2]+[(CH3)3SnCl2]- was prepared by the reaction of Ph3PAuCl with ((CH3)3Sn)2S and characterised by an X-ray structure determination [C2/c, a = 1713.4(5), b = 2996.7(12), c = 3081.7(12) pm, β = 102.40(3)°, Z = 8, R = 0.074]. The cation displays short Au ··· Au contacts and narrow Au-S-Au angles ( < 90°). The chlorine atoms of the anion are axially arranged. There are two independent anions, one lying on, and the other disordered about, the crystallographic twofold axes
NMR-Spektroskopie an paramagnetischen Komplexen, XXVII [1] Paramagnetische 1,1' .2,2' .3,3' .4,4' -Oktamethylmetallocene / NMR Spectroscopy on Paramagnetic Complexes, XXVII [1] Paramagnetic 1,1' .2,2' .3,3' .4,4' Octamethylmetallocenes
Authors: Köhler Frank H. , Doll Karl H.
Published: February 2015

The tetramethylated cyclopentadienyl anion has been prepared from tiglinic acid and reacted with solvated metal(II) chlorides to give new octamethylmetallocenes (Me-jcp^M. For M = V, Cr, Co and Ni the paramagnetic 1H and 13C spectra have been recorded. The NMR data prove the molecular structure and show that all methyl groups rotate almost freely. The methyl proton resonance of the nickelocene may serve as a probe for the adjustment of metallocene properties by ring substitution. Based on qualitative MO arguments the correlation of electron spin densities and paramagnetic shifts lead to an understanding of the signal splitting of cobaltocenes. From the electronic point of view the octamethylmetallocenes may be regarded as being in vers to 1,1'-dimethylmetallocenes
Photochemisches Verhalten von Bis(trifluormethylthiyl)trithiocarbonat in Lösung / Photochemical Behaviour of Bis(trifluoromethylthiyl)trithiocarbonate in Solution
Authors: Schlosser Karl
Published: February 2015

Bis(trifluoromethylthiyl)trithiocarbonate shows electronic transitions at 496 nm (nπ*), 299 nm {ππ*) and 259 (nσ*). Photolysis with 254 and 300 nm light at 200 and 309 K in pentane, and at 371 K in heptane yields a mixture of CS2 and perfluorinated compounds such as F3CSCF3, F3CSSCF3, (F3CS)3C-C(SCF3)3, (F3CS)2C=C(SCF3)2, (F3CS)3CH and F3CS-substituted solvent. The concentration of these newly formed products versus time of irradiation has been monitored. The primary photochemical process is the intramolecular decomposition into CS2 and F3CS- and F3O radicals which dimerize in a solvent cage. The formation of (F3CS)3C-C(SCF3)3 is interpreted in terms of a competition between this combination process and trapping of trifluoromethyl radicals by (FsCS)2CS, forming (F3CS)3C-, which subsequently dimerizes. On irradiation at 496 nm (nπ*) no photochemical process has been observed
The Hei and HeH Photoelectron Spectra of [Fe*?3-C3H5(CO)3X] and [Fe^3-C4H7 (CO)3X] (X = Cl, Br, I) and [CoC3H5(CO)3]
Authors: Louwen Jaap N. , Hart Jaap , Stufkens Derk J. , Oskam Ad
Published: February 2015

By means of UV photoelectron spectroscopy (UPS) the electronic structures of [Feη3.C3H5(CO)3X], [Feη3-(2-CH3C3H4)(CO)3X] (X = Cl, Br, I) and [Co(C3H5)(CO)3] have been studied. Detailed assignments are possible and surprisingly low ionization energies (as low as 8.19 eV) are found for iodine lone pair type Orbitals. From the spectra a large difference in π backbonding is found between the cobalt and iron complexes
Komplexe mit alkylsubstituierten Phosphinomethanen und -methaniden, III [1] Strukturchemie dreigliedriger Brückenliganden, III [2] Bis(dimethylphosphino)metlian als Brückenligand in einem dimeren Ag(I)-Komplex / Complexes with Alkyl Substituted Phosphinomethanes and -methanides, III [1] Structural Chemistry of Three-membered Bridging Ligands, III [2] Bis(dimethylphosphino)methane as a Bridging Ligand in a Dimeric Ag(I) Complex
Authors: Karsch Hans H. , Schubert Ulrich
Published: February 2015

[(Me2PCH2PMe2)]2Ag2](PF6)2 has been prepared and characterized by an X-ray structure analysis. It crystallizes in the space group Pbca with a - 1117(1), b = 1768(5) and c = 1315(2). The dication forms an eight membered centrosymmetric ring, the Ag and P atoms being nearly coplanar. Ag-Ag* 304.1(2) pm. The structure is compared with that of the free ligand [15] and of an analogous Ph2PCH2PPh2 complex of Au(I) [9]
Eine neue Synthese, das Schwingungsspektrum und die Kristallstruktur von Tetraphenylarsonium-hydrogendichlorid As(C6H5)4[Cl2H] / A New Synthesis, the Vibrational Spectrum and the Crystal Structure of Tetraphenylarsonium Hydrogendichloride As(C6H5)4Cl2H]
Authors: Müller Ulrich , Dörner Hans-Dieter
Published: February 2015

As(C6H5)4
+[Cl2H]- crystallizes in the monoclinic space group B2/b with four formula units per unit cell, the lattice constants being a =1704, 6 = 1751, c - 705 pm and y = 92.73°. The crystal structure was determined and refined from X-ray diffraction data to a residual index of R = 0.043. The Cl2H- ion is situated on an inversion center with a Cl···Cl distance of 309 pm. The IR and Raman spectra confirm the presence of symmetrical Cl2H- ions; the observed splitting of IR bands can be explained by factor group analysis. A simple procedure for the preparation consists of the reaction of HCl with As(C6H5)4Cl
Fixierung von Metallcarbonylen auf Poly-Isocyaniden [1] / Anchoring of Metal Carbonyls on Poly Isocyanides [1]
Authors: Menzel Hartmut , Fehlhammer Wolf Peter , Beck Wolfgang
Published: February 2015

Polyisocyanides with the groups -CH2N ≡ C and -C(O)O(CH2)2N≡C attached to polystyrene have been prepared and reacted with various metal carbonyl compounds resulting in the fixation on the polymeric supports of-M(CO)5, -M(CO)4 (M = Cr, Mo, W), -MO(Cl)(η-C5H5)(CO)2, -Mn2(CO)η -Mn(CO)ηX (N = 3, 4; X = Cl, Br), -Fe(CO)4, -Fe3(CO)11, -FeI2(CO)2, -FeX(η-C5H5)(CO) (X = Cl, Br, I), -Ru(CO)4, -Ru3(CO)9, ,,-Os3H2(CO)10", and -RhCl(CO)2. The cyano complexes [Fe(CN)2(η-C5H5)CO]- and [Mo(CN)2(η-C5H5)(CO)2]- have been immobilized by alkylation with chloromethylated polystyrene
Heteronucleare Clustersysteme, XX [1] μ3-Bi8mutio-cyclo-tris(tricarbonyliridium) (3 Ir-Ir), BiIr3(CO)9 Darstellung und Strukturuntersuehung eines neuartigen Iridiumclusters / Heteronuclear Cluster Systems, X X [1] μ3-Bismutio-cyclo-tris(tricarbonyliridium)(3Ir-Ir), BiIr3(CO)9 - Synthesis and Structural Investigation of a Novel Iridium Cluster
Authors: Kruppa Werner , Bläser Dieter , Boese Roland , Schmid Günter
Published: February 2015

The synthesis of BiIr3(CO)9 is described. IR and mass spectroscopic data are discussed. The structure of BiIr3(CO)9 was solved by X-ray analysis. The structural data are discussed and compared with those of the related compounds Ir4(CO)12 and Bi[Co(CO)4]3, respectively
Mesoionische Sechsringheterocyclen, IV [1]; Struktur des 2-Ferrocenyl-3.5-diphenyl-6-oxo-6H-1.3-oxazin-3-ium-4-olats / Mesoionic Six-Membered Heterocycles, IV [1] Structure of 2-Ferrocenyl-3,5-chphenyl-6-oxo-6H-l,3-oxazine-3-ium-4-olat
Authors: Debaerdemaeker Tony , Friedrichsen Willy
Published: February 2015

The structure of the title compound has been determined by X-ray crystallography
Mesoionische Sechsringheterocyclen, V [1, 2]; Reaktionen von 6-Oxo-6H-1.3-oxazin-3-ium-4-olaten mit o-Chinonen und Heterokumulenen / Mesoionic Six-Membered Heterocycles, V [1, 2] Reactions of 6-Oxo-6H-l,3-oxazin-3-ium-4-olates with o-Quinones and Heterocumulenes
Authors: Friedrichsen Willy , Kujath Eckard , Liebezeit Gerd
Published: February 2015

Mesoionic 6-oxo-6H-1,3-oxazine-3-ium-4-olates (1, 7) react with o-quinones (2, 4) to give compounds 3, 6, which may result from a primary [4+4]cycloaddition and subsequent loss of carbon dioxide. Phenyl isocyanate and phenylisothiocyanate react with 1h and 9 - possibly via a [2 + 4]cycloadduct - to give 11, 12, 13 and 14, respectively
Über die Konformation yon 1.2.4.5-Tetrathian / On the Conformation of 1,2,4,5-Tetrathiane
Authors: Susilo Rudy , Gmelin Rolf
Published: February 2015

The conformation of 1,2,4,5-tetrathian was determined by means of dynamic NMR spectroscopy. The barrier (ilG+) of the chair/twist equilibration is 14.5 kcal/mol and the chair form is more stable than the twist form in this molecule by 1.4 kcal/mol. These experimental data are in excellent agreement with force field calculations
Synthesen mit aliphatischen Dialdehyden, XXXII [1] Darstellung und Reaktionen N-substituierter 2-Aminomalondialdehyde / Syntheses with Aliphatic Dialdehydes, XXXII [1] Syntheses and Reactions of N-Substituted 2-Aminomalondialdehydes
Authors: Reichardt Christian , Rust Ulrich
Published: February 2015

The 2-amino malondialdehyde bis[dimethylacetal] 2 and some of its N-monosubstituted derivatives 7 a-d as well as the o-carboxy benzoyl malondialdehyde 12 have been prepared. With heterocyclic imonium salts these amino malondialdehyde derivatives form, by a twofold condensation reaction, the y-acylamino-substituted pentamethine cyanine dyes 15 a-c, 17, and 18a-b, the UV/Vis and 13C NMR spectra of which are recorded with respect to the influence of the y-substituent on these spectra
Triplett-sensibilisierte Isomerisierung des Insektizids Thiodan / Triplet Sensibilized Isomers of the Insecticide Thiodane
Authors: Parlar H. , Baumann R. , Bahadir M.
Published: February 2015

The photoisomerization reactions of cyclodiene insecticide Thiodane were investigated in different solvent systems, with wavelengths above 290 nm. The results show that /S-isomere (2) can be converted in the presence of acetone into the a-isomere (1). Photokinetic experiments give sufficient information on the character of the excited state of these compounds
Neue Silber(I)-germanate / New Silver(I)-germanates
Authors: Jansen Martin
Published: February 2015

Four silver(I)-germanates have been prepared from the binary components Ag2O and GeO2 by solid state reaction applying elevated oxygen pressures (2500-3000 bar). Ag6Ge2O7 isisostructural to Ag6Si2O7(II) [P21,a= 16.268(3), b = 10.021(2), c = 5.320(1) Å, β = 90.85(2)°], Ag10Ge4O13 to Ag10Si4O13 [PT, a = 11.731(3), b = 9.147(3), c = 8.727(4) Å, a = 99.33(2), β = 91.61(1), γ = 114.27(2)°].

According to the results of preparative investigations and chemical analysis there are two further phases in the system Ag2O/GeO2 of compositions ′Ag2GeO3′ and ′Ag2Ge2O5′.
Ein neues Verfahren zur Darstellung asymmetrisch substituierter Phosphimminophosphoniumsalze [Bun
3P-N=PR3]X / A New Method for the Preparation of Asymmetrically Substituted Phosphiniminophosphonium Salts [Bun
3P-N=PR3]X
Authors: Bartsch Rainer , Stelzer Othmar , Schmutzler Reinhard
Published: February 2015

Tri-n-butylfluorophosphonium bromide and N-trimethylsilylphosphinimines R3P=N-SiMe3 react with formation of trimethylsilyl bromide and fluoride and mixed phosphiniminophosphonium bromides/fluorides, [Bun
3P-N=PR3]Br/F. Metathetical reactions with sodium iodide, ammonium hexafluorophosphate and potassium Perchlorate yield the corresponding phosphiniminophosphonium iodides, hexafluorophosphates and perchlorates, respectively. The cations [Bun
3P-N=PR3]+ behave as phase-transfer agents. In the presence of these cations permanganate anion is transferred from aqueous solutions into benzene.
Polymere Dimethyl-und Diphenylglyoximatokomplexe des Cobalts und Eisens mit 4.4′ -Bipyridin als Brückenligand. Die Kristallstruktur des Bis(dimethylglyoximato)4.4′-bipyridincobalt(II)*/ Polymeric Dimethyl-and Diphenylglyoximato Complexes of Cobalt and Iron with 4,4′-Bipyridine as a Bridging Ligand. The Crystal Structure of Bis(dimethylglyoximato)4,4′-bipyridine Cobalt(II)
Authors: Kübel Frank , Strähle Joachim
Published: February 2015

Polymeric bis(dimethyl- and diphenylglyoximato)-complexes of Fe(II) and Co(II) with 4,4′-bipyridine as a bridging ligand have been synthesized from the glyoximato metal complexes and 4,4′-bipyridine in ethanol. The Co(II) compounds are paramagnetic and surprisingly stable against oxidation. The iron complexes are weak electrical conductors with approximately 10-9 Ω-1cm-1 . Bis(dimethylglyoximato)-4,4′-bipyridine cobalt(II) crystallizes triclinic in the space group PT with Z=1. The crystal structure is built up by linear chains of alternating Co(II) glyoximato complexes and axial bonded 4,4′-bipyridine bridges. The compound is characterized by strong Co-N-bonds of 189 pm within the glyoximato moiety and weak bonds of 228 pm to the bipyridine ligand. The two heterocycles of the bipyridine are coplanar, therefore the local symmetry of the complex is D2h.
S4N4 und seine Derivate: Isolierung und Struktur von Pd2(S3N)2(S3N2) / S4N4 and its Derivatives: Isolation and Structure of Pd2(S3N)2(S3N2)
Authors: Thewalt Ulf
Published: February 2015

The reaction of S4N4 with PdCl2 in methanol yields among other products the dinuclear complex Pd2 (S3N)2(S3N2) (D): dark red needles, space group R"3̄ with a = 32.759(15), c = 6.516(4) Å and Z = 18. The structure of D was determined by an X-ray analysis. Each palladium atom is part of an almost planar PdS3N metallocycle. The SNSNS group acts as a bridge whereby each of its terminal S atoms is bonded to both Pd atoms. The Pd atoms possess a square planar coordination by four S atoms. The coordination planes form an angle of 114.9°. The Pd-Pd distance of 2.921(2) Å is rather short.
Ein methylimidoverbrücktes Diphosphoran, in dem Stickstoff nicht Glied eines Ringes ist / A Methylimido-bridged Diphosphorane in which Nitrogen is not Member of a Ring
Authors: Röschenthaler Gerd-Volker , Storzer Werner
Published: February 2015

N-Substituted 2-Amino-4,4,5,5-tetrakis(trifluoromethyl)-l,3,2 λ3 (λ5)-dioxaphospholanes, Dilithium Perfluoropinacolate, Diazadiphosphetidine, 2,2,2 -Trichloro -4,4,5,5 -tetrakis (trifluoromethyl) -1,3,2 λ5 -dioxaphospholane

MeN(PCl2)2 reacts with Li2[0C(CF3)2C(CF3)2O] to give MeN{P[0C(CF3)2C(CF3)2O]}2 which adds chlorine under formation of MeN{PCl2[0C(CF3)2C(CF3)2O]}2 .

The chlorophosphorane decomposes slowly to yield PCl3[0C(CF3)C(CF3)2O] and the diazadiphosphetidine {MeNPCl[OC(CF3)2C(CF3)2O]}2.
Alkyl- und Arylkomplexe des Iridiums und Rhodiums, IX [1] Organorhodiumverbindungen Rh(R)(CO)(PPh3)2 (R = Alkyl, Aryl) und homologe Iridiumalkyle / Alkyl and Aryl Complexes of Iridium and Rhodium, IX [1] Organorhodium Compounds Rh(R)(CO)(PPh3)2 (R = Alkyl, Aryl) and Related Iridium Alkyls
Authors: Dahlenburg Lutz , Mirzaei Fazlollah , Yardimcioglu Ah
Published: February 2015

A series of organorhodium and -iridium complexes M(R)(CO)(PPh3)2 (M = Rh: R = C6H5, 2-MeC6H4, 4-MeC6H4, 2,4,6-Me3C6H2, CH3, CH2SiMe3, CH2CMe3; M = Ir: R = CH3, CH2Ph, CH2SiMe3, CH2CMe3) has been prepared from MCl(CO)(PPh3)2 and the corresponding organolithium or Grignard reagents. Of these compounds, the mesitylrhodium complex Rh(2,4,6-Me3C6H2)(CO)(PPh3)2 as well as the iridium and rhodium alkyls with Me3SiCH2 and Me3CCH2 ligands show cis,trans-isomerism which is demonstrated on the basis of infrared and NMR spectroscopic evidence.
Koordinationschemie von Liganden mit den Donatoren Phosphor und Schwefel, I Nickel(II)-Komplexe mit Phosphinomethylthioethera als Liganden Gleichgewicht zwischen planarem und tetraedrischem Nickel(II) / Coordination Chemistry of Ligands with the Donors Phosphorus and Sulfur, I Nickel(II) Complexes with Phosphinomethylthioethers as Ligands A Planar-Tetrahedral Equilibrium with Nickel(II)
Authors: Gerdau Thomas , Kramolowsky Reinhard
Published: February 2015

The preparation and structural characterization of phosphinomethylthioethernickel(II) complexes of the general type [NiX2(Ph2PCH2SR)2] (X = CI, Br, I, NCS: R = Me, Ph) are reported. In all the complexes the phosphinomethylthioethers act as monodentate ligands coordinating via the phosphorus atom. The isothiocyanate complexes are diamagnetic both in solution and in the solid state and have been assigned trans-planar configuration. As shown by magnetic measurements and by electronic spectroscopy, the halo complexes exhibit a square-planar (diamagnetic) ⇄ distorted-tetrahedral (paramagnetic) equilibrium in solution, while in the solid state the complexes are either square-planar or distorted-tetrahedral. For the complex [NiBr2(Ph2PCH2SMe)2] both isomers have been isolated in the solid state.
Ethyldiphenylphosphin und 1.2-Bis [bis(β-diphenylpho8phinoethyl)pho8phino] ethan: Derivate des Hexacarbonyl]iydridovanadium(+I) und Hexacarbonylvanadat(—I) / Ethyldiphenylphosphine and l,2-Bis[bis(β-diphenylphosphinoethyl)phosphino]ethane: Derivatives of Hexacarbonylhydridovanadium(+I) and Hexacarbonylvanadate(—I)
Authors: Rehder Dieter , Puttfarcken Uwe
Published: February 2015

The coordination properties of Ph2PEt (pi) and

(Ph2PCH2CH2)2PCH2CH2P(CH2CH2PPh2)2 (P2P4) towards HV(CO)6 and [V(CO)6]- are compared. Preparation and spectral properties (IR, 1H, 31P and 51V NMR) are described for the complexes HV(CO)4(p1)2, [Et4N][V(CO)6-n(p1)n] (n = 1, 2), HY(CO)mP2P4 (m = 1-5) and [Et4N][V(CO) mP2P4] (M = 1-3). The anionic species are obtained by photo-induced CO exchange, the hydrido complexes by treatment of the anionic complexes with t-BUCl/H2O or - more conveniently - by ion exchange on silica gel (m - 1-3) and subsequent UY irradiation (m = 4, 5). Complexes containing four CO groups are cis-configurated, the p1 species being extremely labile. Trisubstitution yields an isomeric mixture of mer- and fac-[V(CO)3p2p4]-. A consistent explanation of the 1H pattern in the hydride region is possible on the basis of a facecapped octahedral structure with a restricted dynamic behaviour. The positions of the CO ligands in HV(CO)3p2p4 and HV(CO)2P2P4 are facial and trans, respectively. Only chelate five-ring structures are formed.
Quantenmechanische Berechnungen zu pseudo-einstufigen (C-C)-Spaltungen bei Radikalkationen von Carbonsäuren / Quantum Mechanical Calculations on Pseudo-One-Step Cleavages of Carbonic Acid Cation Radicals
Authors: Frenking Gemot , Schmidt Jochen , Schwarz Helmut
Published: February 2015

Extensive quantum mechanical calculations on the unrestricted MINDO/3 level reveal that for some ionised carbonic acids the energetically most feasible pathway for uni-molecular C-C cleavage cannot be described as being a one-step process. In complete agreement with experimental results the computational data are consistent with an inter-pretation of the reaction as being a two-step process, in which the reaction commences with a hydrogen migration from a CH-bond onto the ionised C = 0 group. The dissociation is completed with a radical induced C-C cleavage thus generating quite stable protonated unsaturated carbonic acids. Whereas the MINDO/3 results clearly show that the two-step process is energetically favoured over the direct C-C cleavage, this computational method fails badly in explaining the experimentally established fact that in the two-step sequence the hydrogen migration is the rate-determining step. This failure is due to the MINDO/3 inherent weakness of overestimating the stability of cyclic ions, e.g. cyclic transition states as they are formed in the course of the hydrogen migration step. Single point ab initio calculations carried out on the 4-31G level substantiate this interpretation in that the transition state for the hydrogen migration is calculated to lie substantially higher than that for the actual C-C dissociation step, but is still much lower than that calculated for a direct simple bond cleavage process of the respective cation radical.
Vom "criss-cross"-Schema abweichende Cycloadditionsreaktionen an das Azin-System [1] Zum Cycloadditionsverhalten von Hexafluoracetonazin gegenüber N.N-Dialkyl-cyanamiden [2] / Cycloaddition Reactions of Azines Violating the "criss-cross" Cycloaddition Scheme [1] Cycloaddition Behaviour of Hexafluoroacetone Azine towards N,N-Dialkyl-cyanamides [2]
Authors: Burger Klaus , Hein Friedrich , Firl Joachim
Published: February 2015

Depending upon the molar ratio of the educts and the reaction conditions used, hexa-fluoroacetone azine (1) reacts with N,N-dialkyl-cyanamides (2) to give 3,4,6-triazaocta-2,4,6-trienes (6) and/or 4,4-bis(trifluoromethyl)-1,4-dihydro-1,3,5-triazines (7). Cyclo-addition reactions of 6 with tert-butyl isocyanide and 1-diethylamino(propine) are de-scribed. IR, 1H, 19F, and 13C NMR data of the new compounds are discussed.
Die Photoaddition von Bromtrichlormethan an Allyl-Systeme / Photoaddition of Bromotrichloromethane to Allylic S ystems
Authors: Seidel Peter , Ugi Ivar
Published: February 2015

The preparation of various 1-substituted 4,4,4-Trichloro-2-bromo-butanes by photo-addition of bromotrichloromethane to allylic systems is described. Generally a more uniform product and a higher yield are obtained by this photoaddition than by the corresponding chemically initiated radical chain reaction.
The Chemical Evolution of a Nitrogenase Model, 20 Alkyl Molybdates(VI) and the Mechanism of Hydrocarbon Production by Nitrogenase [1]
Authors: Schrauzer G. N. , Hughes Laura A. , Strampach Norman
Published: February 2015

Colorless alkylmolybdates(VI) of composition R-MoO3-are generated in aqueous solutions by the alkaline hydrolysis of complexes R-Mo(Bpy)(0)2Br(Bpy = 2,2′-bipyridyl, R = CH3 and higher alkyl). At room temperature in alkaline aqueous solution, the new organometallic derivatives of oxomolybdate(VI) are remarkably resistant against Mo-C bond hydrolysis. Decomposition occurs more rapidly on heating, affording unrearranged alkanes according to the eq.: R-MoO3
- + OH-→RH + Mo04=.

In acidic solutions, the methylmolybdate(VI) species decomposes with the formation of a mixture of methane and ethane while higher alkylmolybdates carrying hydrogen in the β-position relative to molybdenum undergo Mo-C bond heterolysis by way of β-elimina-tion: R-CH2CH2-MoO3 → Mo+4 (aq) + H+ + R-CH = CH2.

The Mo-C bond of alkylmolybdates is resistant to oxidants but is very sensitive to cleavage under reducing conditions. Reductive Mo-C bond cleavage occurs particularly rapidly in the presence of thiols and reduced ferredoxin model compounds. The latter reactions simulate the terminal steps of hydrocarbon producing reactions of nitrogenase with alternate substrates such as CN-, R-CN or R-NC, confirming previous mechanistic conclusions concerning the mechanism of nitrogenase action.
Darstellung und Kristalldaten der isotypen Aluminum (Gallium)-Indium-Sulfide Al2In4S9 und Ga2ln4S9 / Preparation and Crystal Data of the Isotypic Aluminium (Gallium) Indium Sulphides Al2In4S9 and Ga2ln4S9
Authors: Schulte-Kellinghaus M. , Krämer V.
Published: February 2015

The title compounds were prepared by chemical vapour transport. They crystallize in the space group P3̅m 1 with the lattice parameters a = 7.532(3) (7.589(5)) and c = 36.54(2) (36.70(5))!. X-ray powder diffraction data are listed and the T,x phase diagram of the system AlInS3-In2S3 is shown.
Heterogeneous Catalysis, VI Direct Reduction of Alcohols to Hydro- carbons [1]
Authors: Maier Wilhelm F. , Thies Irina , Ragué Schleyer Paul von
Published: February 2015

Secondary and tertiary alcohols are converted cleanly to the parent hydrocarbons in the gas phase with H2 in the presence of a Ni/Al2O3 catalyst at 190 °C. Primary alcohols are de-hydroxymethylated; e.g., 1-hydroxymethylada-mantane (4) gives adamantane (1). Alumina alone, in the absence of Ni, results in the formation of homoadamantane (5) from 4.
Darstellung und Reaktionen von S.N-Bis(heptafluorisopropyl)schwefelfluoridimid / Preparation and Reactions of S,N-Bis(heptafluoroisopropyl)sulphurfluoride Imide
Authors: Lensch Cornelia , Glemser Oskar
Published: February 2015

S,N-Bis(heptafluoroisopropyl)sulphurfluorideimide (1) is prepared by the reaction of i-C3F7SF3 with (CF3)2CNH in the presence of CsF. The reaction with AlCl3 leads to two elimination products 4 and 5. With XeF2 the sulphur(II) atom in 4 and 5 is oxidized. In 1 the sulphur-bonded fluorine can be substituted by -OCH3 to give i-C3F7NS(i-C3F7)OCH3 (7).
Synthese von β-Diphenylphosphin-carbonyl-Verbindungen durch Umsetzung von Brommethyl-carbonyl-Verbindungen mit Diphenyl(trimethylsilyl)phosphin / Synthesis of β-Diphenylphosphine-carbonyl Compounds by Reaction of Bromomethyl-carbonyl Compounds with Diphenyl(trimethylsilyl)phosphine
Authors: Brunner Henri , Dylla Monika E. , Hecht Gabriele A. M. , Pieronczyk Willigis
Published: February 2015

1-Diphenylphosphinopropan-2-on-hydrobromide (1a), 2-Diphenylphosphino-1-phenylethan- 1-on-hydrobromide (2a), and 1,3-Bis(diphenylphosphino)propan-2-on-bis(hydrobromide) (3a) were prepared by the reaction of the corresponding β-bromo-ketones with diphenyl(trimethylsilyl)phosphine. By treatment with NaOH the hydrobromides 1a-3a were converted into the ketones 1b-3b. The reactions of 1a-3a with (R)-(+)-1-phenylethylamine were investigated.
Cyclisierungsreaktionen lithiierter Fluorsilanole und Aminofluorsiloxane - Kreuzdimerisierung eines Silicenium-Ylids / Cyclisation Reactions of Lithiated Fluorosilanols and Aminofluorosiloxanes - Cross-dimerisation of a Silicenium-Ylid
Authors: Clegg William , Klingebiel Uwe , Sheldrick George M.
Published: February 2015

KOH reacts with bis(isopropyl-trimethylsilyl)-amino-difluorosilane to give the fluoro-silanol 1. An aminofluorosiloxane 2 is obtained in the reaction of [(Me3Si)2N]2SiF2 with KOH via a 1,3-silyl-group migration. The four-membered SiOSiN ring 5 can be prepared in several steps from 1. Six-membered SiO rings 8-10 are formed in the reaction of 1,3-fluorosilanols 6 and 7 with butyllithium. Lithiated 2 reacts with PCl3 to give a four-membered P2N2 ring 11, and with 2-methyl-2-propenal to give two isomeric (2 + 4) cycloadducts 12 and 13. The silicenium ylid formed initially by thermal elimation of LiF from lithiated 2 in PE/THF cross-dimerises to give a Si2N2 ring 14. If the reaction is carried out in n-heptane, the product after recrystallisation from acetone, 16, is an isomer of 14. The crystal structures of 14 and 16 have been determined.
Sila-Pharmaka, 24. Mitt. [1]. Sila-Analoga von Nifedipin-ähnlichen 4-Aryl-2.6-dimethyl-1.4-dihydropyridin- 3.5-dicarbonsäure-dialkylestern, II. / Sila-Drugs, 24th Communication [1]. Sila-Analogues of Nifedipine-Like Dialkyl 4-Aryl-2,6-dimethyl-1,4-dihydropyridine- 3,5-dicarboxylates, II.
Authors: Tacke R. , Bentlage A. , Sheldrick W. S. , Ernst L. , Towart R. , Stoepel K.
Published: February 2015

In the course of systematic studies on sila-substituted drugs the nifedipine-like 1.4-dihydropyridine derivatives 4a, 4b and 4c were prepared and investigated with respect to sila-substitution effects. By X-ray diffraction analyses 4a, 4b and 4c were found to be isostructural. The C/Si-analogues exhibit similar spasmolytic activities (in vitro, guinea pig ileum), comparable with that of nifedipine. However, the compounds differ substantially in their in vivo activity, as measured by the antihypertensive effect on the renal-hypertensive rat. The experimental results are discussed with respect to the carbon/silicon exchange.
Transition Metal Complexes of Diazenes, XVIII [1]. Reactions of 1,2-Diazetines and 1,2-Diazetine-N-oxides with Chromium and Tungsten Carbonyls
Authors: Albini A. , Kisch H.
Published: February 2015

Chromium and tungsten carbonyls react with 3,3,4,4-tetramethyl-1,2-diazetine (1) or its mono-N-oxide (2) to form complexes (1)M(CO)5, (1)2M(CO)4, (1)M2(CO)10, (1)2M2(CO)8, (1)3M2(CO)6 or (2)M(CO)5 and (2)2M(CO)4, resp. In the reactions of 2 some deoxygenation affords complexes of 1 as by-products. The stability of these and other complexes of the N=N group is related to the ring size of the cyclic diazene ligand.
Enamine als Zwischenprodukte der Simon-Awe-Komplexe / Enamines as Intermediates of Simon-Awe Complexes
Authors: Wiegrebe Wolfgang , Vilbig Margit
Published: February 2015

Enamines from acetaldehyde, propionaldehyde and cyclohexanone produce coloured complexes with disodium-pentakis-(cyano-C)-nitrosylferrate(2) more rapidly than the carbonyl components together with piperidine, so indicating enamine intermediates. - The Legal complexes from acetaldehyde and acetone are protonated to the corresponding Simon-Awe complexes.
Isolierungen und 11C-NMR-Spektroskopie von Indoleninalkaloiden / Isolation and 13C NMR Spectroscopy of Indolenine Alkaloids
Authors: Khan Mohammad Ataullah , Horn Hans , Voelter Wolfgang
Published: February 2015

The indolenine alkaloids raucaffricine and perakine were isolated from Rauwolfia caffra Sonder and their PFT 13C{1H}-NMR spectra studied for the first time. The interpretations of their spectra were accomplished in correlating with those of quinuclidine, indole, methyl-α-D-galactopyranoside, methyl-β-D-galactopyranoside, methyl-2,6-di-O-methyl-α-D-galactopyranoside and methyl-3-O-methyl-β-D-galactopyranoside.
Herbacetin-3-β-D-(2-O-β-D-glucopyranosidoglucopyranosid)- 8-β-D-glucopyranosid und Gossypetin-3-β-D-(2-O-β-D-glucopyranosido- glucopyranosid)-8-β-D-glucopyranosid, zwei neue Flavonolglykoside aus Equisetum hyemale L. (Equisetaceae) / Herbacetin-3-β-D-(2-O-β-D-glucopyranosidoglucopyranoside)-8-β-D-glucopyranoside and Gossypetin-3-β-D-(2-O-β-D-glucopyranosidoglucopyranoside)-8-β-D-glucopyranoside, two New Flavonol-glycosides from Equisetum hyemale L. (Equisetaceae)
Authors: Geiger Hans , Reichert Sven , Markham Ken R.
Published: February 2015

Two new flavonol glycosides, herbacetin-and gossypetin-3-β-D-(2-O-β-D-glucopyrano-sidoglucopyranoside)-8-β-D -glucopyranoside have been isolated from the aerial parts of Equisetum hyemale L. together with the known kaempferol-3-β-D-(2-O-β-D-glucopyrano-sidoglucopyranoside) -7-β-D -glucopyranoside.
Some Extensions of von Braun (BrCN) Reaction on Organic Bases: Part II
Authors: Malik Abdul , Afza Nighat , Siddiqui Salimuzzaman
Published: February 2015

Extensions of von Braun Cyanogen bromide reaction on Ephedra alkaloids and simpler bases have resulted in synthesis of substituted oxazolidines and a whole series of nitrogen analogues of ephedrine, desoxy ephedrine and simpler amines. The general applicability and limitations of such extension of the reaction are also discussed.
6β-Hydroxyteuscordin and 2β-,6β-Dihydroxyteuscordin Two New Diterpenoids from Teucrium scordium L.
Authors: Papanov Georgi Y. , Malakov Peter Y.
Published: February 2015

Two new furanoid diterpenes of clerodane type, 6β-hydroxyteuscordin (1) and 2β, 6β-dihydroxyteuscordin (3) have been isolated from Teucrium scordium var. scordium, Lamiaceae. Their structures and stereochemistry have been determined on the basis of chemical reactions and spectroscopic evidence.
Trigocoumarin -a New Coumarin from Trigonella foenumgraecum
Authors: Parmar Virinder S. , Jha Hirday N. , Sanduja Sudershan K. , Sanduja Radhika
Published: February 2015

A new coumarin, named trigocoumarin has been isolated from Trigonella foenumgraecum along with some known compounds. Based upon its spectral (IR, UV, NMR and MS) and analytical data, trigocoumarin has been assigned the structure: 3-(ethoxycarbonyl)-methyl-4-methyl-5,8-dimethoxycoumarin.
Neue effektive Synthesemethoden für UCl5 und UCl6 / New Effective Methods for the Synthesis of UCl5 and UCl6
Authors: Redieß Klaus , Sawodny Wolfgang
Published: February 2015

New methods are reported which allow the synthesis of pure UCl5 and UCl6 in high yields. UCl5 is obtained by chlorination of UF5 · 2 SbF5 with BCl3 at low temperatures, UCl6 by direct chlorination of UCl4 in SbCl5.
Beiträge zur Chemie des Phosphors, 113 [1, 2] Synthese und Eigenschaften des Azadiphosphirans (t-BuP)2N(i-Pr) / Contributions to the Chemistry of Phosphorus, 113 [1, 2] Synthesis and Properties of the Azadiphosphirane (t-BuP)2N(i-Pr)
Authors: Baudler Marianne , Kupprat Gabi
Published: February 2015

1-Isopropyl-2,3-di-tert-butyl-1,2,3-azadiphosphirane (1) was synthesized by [2+1] cyclocondensation of Cl(t-Bu)P-P(t-Bu)Cl with (Me3Sn)2N(i-Pr) at 75 °C. 1 could be isolated in pure state by fractional distillation and is stable at room temperature under inert conditions. The temperature independent 31P NMR spectrum indicates that the arrangement at the nitrogen atom is planar, probably due to dative π-bonds from nitrogen to the phosphorus atoms
Darstellung und Kristallstruktur von Arsen(III)phosphor(V)oxidhydroxid As2PO5(0H) / Preparation and Crystal Structure of the Arsenic(III) Phosphorus(V) Oxide Hydroxide As2PO5(OH)
Authors: Bodenstein Doris , Brehm Axel , Jones Peter G.
Published: February 2015

The title compound was prepared by heating the hydrolysis products of AsPO4 in a sealed tube. The crystal structure was determined and refined to R = 0.028 [P21/n, a = 454.5(1), b = 1229.0(2), c = 972.8(3) pm, β = 100.13(2)°, Z = 4]. The structure, which is not isostructural with As3O5(0H), consists of infinite layers, containing pyramidal AS(III)O3 and tetrahedral P(V)O4 groups, and stabilised by hydrogen bonding of the form P-O-H­···O-P
Gemischtvalente Bromoaurate(I,III) und ihre Mößbauer-Spektren / Mixed Valent Bromo Aurates(I.III) and their Mößbauer Spectra
Authors: Gütlich P. , Lehnis B. , Strähle J.
Published: February 2015

New nonstoichiometric cesium bromo aurates(I,III) Cs1+x(AuBr4)(AuBr2, Br3,Br)x have been synthesized, in which the almost equally shaped anions AuBr3- and Br3- can interchange themselves. The compounds crystallize in a disordered cubic perovskite structure with a = 547.5 pm or in a tetragonal superstructure with a 16-fold perovskite cell (a = 1553, c = 1099 pm). The investigations show that other bromoaurates as the previously reported "Cs2AgAuBr6" can contain perceptible amounts of Br3- ions also. The IR and 197Au Mössbauer spectra of the new bromoaurates and of Cs2AuoBr6 are discussed