bluuebunny/crossref_metadata_2025 huggingface dataset:
Studies on Ylides: Carbonyl Olefination with Diphenylmethylenetriphenylphosphorane
Authors: Tewari R. S. , Kumari N. , Kendurkar P. S.
Published: March 2015

Diphenylmethylenetriphenylphosphorane, a stable phosphonium ylide, has been prepared and reacted with a range of substituted aromatic aldehyde to afford 1,1,2-triaryl-substituted ethylenes in fair to good yields. The structure of the products are based on IR and NMR spectral evidence.
(CF3)nE-Verbindungen (E = P, As) von Elementen der IV. Hauptgruppe / (CF3)nE Compounds (E = P, As) of Main Group IV Elements
Authors: Ansari Salman , Grobe Joseph
Published: March 2015

Transphosphination reactions of (Me3M)3P and Me3MPH2 compounds (M = Si, Ge, Sn; Me = CH3) using HE(CF3)2 or H2ECF3 (E = P, As) yield derivatives of the types Me3ME(CF3)2, Me3ME(H)CF3, and (Me3M)2ECF3, respectively. The reactivity of the different systems depends on M (Si < Ge < Sn), E (P < As), and the phosphine [Me3MPH2 < (Me3M)2PH < (Me3M)3P]. Me3ME(H)CF3 compounds undergo dismutation forming (Me3M)2ECF3 and H2ECF3. Reactions of the new derivatives with polar compounds (HBr, H2E′CF3, Me3M′Br) result in cleavage of the M-E bond. Decomposition of the CF3E derivatives occurs by β-elimination of fluorine yielding Me3MF besides polymers of unknown structure.
Cleavage Reactions of 5-Arylazo Derivatives of 1-Methyl-2-benzyl-2-imidazolin-4-ones
Authors: Kassab Nazmi Abdel Latif , Harhash Abdel Hamid , Allah Sanna Osman Abd
Published: March 2015

The 5-arylazo-1-methyl-2-benzyl-2-imidazolin-4-ones (1 a-c) undergo ring cleavage with 1% aqueous sodium hydroxide solution affording α-arylhydrazono-phenacetyl-sarcosine amide (2). Prolonged heating of 1 and 2 with the same reagent yields the cyanamide (3). On the other hand, when 1 a-c were refluxed with acetic acid the triazinones (4) were obtained. The latter adds one mole of Grignards reagent to yield the 5-hydroxy-1,2,4-triazine derivatives (5).
Untersuchungen an quartären Pyridinium-Salzen, IV / Investigations of Quaternary Pyridinium Salts, IV
Authors: Gündel Wolf-Hellmut
Published: March 2015

Quaternary salts of nicotinamide react in presence of bases with chlorofrom to substituted 2- (or 3-)azabicyclo[4,1,0]hepten-3 (or -4). An intermediate is isolated.
Stoffwechselprodukte von Mikroorganismen, 146 Massenspektrometrische Identifizierung von 3-Cyclohexenylglycin im Kulturfiltrat von Streptomyces tendae / Metabolic Products of Microorganisms, 146 Mass Spectrometric Identification of 3-Cyclohexenylglycine from Streptomyces tendae
Authors: König W. A. , Hagenmaier H. , Dähn U.
Published: March 2015

From the culture filtrates of Streptomyces tendae (Tü 901) a ninhydrin positive substance was isolated, which was identified as 3-cyclohexenylglycine by gas chromatography-mass spectrometry of some volatile derivatives.
Notizen: Synthese des 1.2.5-Selenadiborolen-Systems / Synthesis of the 1,2,5-Selenadiborolene System
Authors: Siebert Walter , Asgarouladi Bagher
Published: March 2015

The reaction of 3.4-xylenyl-1-diiodoborane with polymeric iodoboron selenide at 180°C yields golden-yellow xyleno-1,2,5-selenathiadiborolene (2).
Notizen: KMR-Spektroskopie an paramagnetischen Komplexen, VIII. Verbesserte Aufnahme von 1H-KMR-Spektren / NMR Spectroscopy on Paramagnetic Complexes, VIII. NMR Spectroscopy on Paramagnetic Complexes, VIII. Improved Recording of 1H NMR Spectra
Authors: Köhler Frank H.
Published: March 2015

1H CW NMR spectra of paramagnetic compounds are frequently disturbed by sidebands. This problem is circumvented by variation of the nuclear single sideband technique or by application of a variable sideband oscillator. Both methods are demonstrated by the 1H spectrum of Bis-(h5-ethylcyclopentadienyl)cobalt.
Notizen: Organozinnverbindungen als Reagenzien, I Eine einfache Methode zur Darstellung von (CF3)2EH und CF3EH2 (E=P, As) / Organotin Compounds as Reagents, I A Simple Method for the Preparation of (CF3)2EH and CF3EH2 (E = P, As)
Authors: Ansari Salman , Grobe Joseph
Published: March 2015

Trifluormethyl phosphines and arsines (CF3)2EH and CF3EH2, respectively, (E = P, As) are obtained in almost quantitative yield by the reaction of (CF3)2EI and CF3EI2, respectively, with trimethylstannane. The intermediate formation of CF3E(H)I was shown for E = P by NMR spectroscopic investigation of a 1:1 mixture of CF3PI2 and HSnMe3.
Notizen: Reactions of Harmaline and its Derivatives, IV Synthesis of a Pentacyclic System Isomeric with 11-Methoxy-5,6-dihydrosempervirine
Authors: Atta-ur-Rahman  , Basha Anwer , Ahmad Viqar Uddin
Published: March 2015

Reaction of harmaline with formyl cyclohexanone has afforded methoxyisosempervirine.
Die Kristallstruktur des Gold(III)bromids / The Crystal Structure of Gold(III) Bromide
Authors: Lörcher Klaus-Peter , Strähle Joachim
Published: March 2015

Gold(III) bromide crystallizes monoclinic in the space group P21/c with four Au2Br6 molecules in a cell of dimensions α = 6.831 Å, b = 20.41 Å, c = 8.105 Å; β = 119.74°. Within the well separated molecules each Au atom has four Br neighbours in a square planar arrangement. The Au-Br distances to the terminal Br atoms are in the range from 2.383 to 2.410 A, whereas the distances to the bridging atoms are slightly longer (2.457-2.471 A).
Darstellung, Struktur und einige Reaktionen von Tris(dimethylamino)gallan / Preparation, Structure and Some Reactions of Trisdimethylaminogallane
Authors: Nöth H. , Konrad P.
Published: March 2015

The aminogallanes Ga[N(CH3)2]3 (1), ClGa[N(CH3)2]2 (2) and Ga[N(Si(CH3)3)2]3 (3) are prepared by reacting GaCl3 with LiN(CH3)2 and NaN[Si(CH3)3]2, respectively. Excess LiN(CH3)2 leads to LiGa[N(CH3)4] which reacts with GaCl3 to yield 1. CS2 inserts into all Ga—N bonds of 1 yielding monomeric Ga[S2CN(CH3)3)2]3 (4).

1 dimerizes via dimethylamino bridges. In contrast, 1H. NMR spectra indicate group exchange for dimeric 2. Assoziation of 3 is prevented due to steric hindrance. The gallium atom in 4 exhibits hexacoordination, and there is evidence for the binding of the (CH3)2NCS2 groups through S atoms only.
Metallkomplexe mit anionischen Liganden von Elementen der 4. Hauptgruppe, X Diskussion der Bindungsverhältnisse in Trihalogenstannidometallat(O)-Komplexen anhand der Ergebnisse von 119mSn-Mößbauer-Untersuchungen / Metal Complexes with Anionic Ligands of Elements of the Main Group IV, X 119mSn-Mössbauer-Spectroscopic Investigations and Bonding Properties of Trihalogenostannido Metalate(0) Complexes
Authors: Odenthal Hermann J. , Kruck Thomas , Ehlert Klaus
Published: March 2015

The 119mSn and 57Fe Mößbauer spectra of the complexes [M(CO)6-n(SnX3)2]n- (n = 1,2,3,6) and [Fe(CO)4SnX3]- are reported. With increasing substitution of CO by [SnX3]-the isomer shift increases, reflecting also the π-acceptor strength of [SnX3]-. The π-back-bonding ability especially of [SnCl3]⁻ is similar to PCl3. A direct relationship between the isomer shift and the electronegativity of the halogen atoms of [SnX3]- and an inverse correlation between δ and Δ is observed.
Gehinderte Ligandenbewegungen in Übergangsmetallkomplexen, VI Darstellung von cis-Tetracarbonyl-trimethylphosphin-olefin-wolfram(0)-Komplexen und Nachweis einer gehinderten Olefinrotation / Hindered Ligand Motions in Transition Metal Complexes, VI Synthesis of cis-Tetracarbonyl-trimethylphosphine-olefin-tungsten(0) Complexes and Proof of a Hindered Olefin Rotation
Authors: Kreiter Cornelius G. , Strack Hans
Published: March 2015

cis-Tetracarbonyl-trimethylphosphine-olefin-tungsten(0) complexes (olefin = maleic and fumaric acid dimethyl ester, ethylene) were synthesized to study the hindered rotation of the olefin ligands. The favourable orientations of the coordinated C-C double bonds with respect to the coordination octahedron were determined.
Über Reaktionen mit Betain, X1 Die katalytische Hydrierung von Diketo-S-Yliden / Reactions with Betaine, X1 The Catalytic Hydrogenation of Diketo-S-Ylides
Authors: Wittmann Helga , Petio Franz Adolf
Published: March 2015

3-Hydroxy-3-phenylpropionic Acid Anilide, Catalytic Hydrogenation

The catalytic hydrogenation (20 °C, 760 mm) of dimethylsulfoniumphenacyl-phenylcarbamoylmethylide (1 a) and the nitro derivative (1 b) yields the new β-keto-S-ylides (3 a) and (3 c). At higher temperature and pressure the same reaction gives under loss of dimethylsulfide the propionic acid anilides (2a) and (2b).
Mesoionische Sechsringheterocyclen, V Pyridinium-Ylide von Malonylheterocyclen / Mesoionic Sixmembered Heterocycles, V Pyridinium Ylides of Malonylheterocycles
Authors: Kappe Thomas , Khorchid-Zadeh Razmik , Steininger Heinz
Published: March 2015

The reaction of 3,3-dichloro-2,4-dioxo-tetrahydroquinolines with pyridine yields the corresponding pyridinium ylides. However, the reaction of 3-diazo-2,4-dioxo-tetrahydroquinolines with pyridine in the presence of copper gives Cu complexes of 4,4′-dihydroxy-3,3′-azo-2-quinolones.
Quantum Chemical Systematization of the PMR Spectra of Some N-(Pyridyl)-pyrrole Derivatives
Authors: Dvortsák P. , Náray-Szabó G. , Vasvári-Debreczy L.
Published: March 2015

In the case of a number of N-(pyridyl)-pyrrole derivatives a linear relation was found between the PMR chemical shifts of the olefinic and aromatic protons and the adjacent carbon net charges. The charge distribution was obtained as a sum of σ- and π-parts, calculated by the Del Re and PPP methods, respectively. Steric effects were treated on the basis of chemical shift anomalies.
Notizen: Verbesserung der Empfindlichkeit bei der Identifizierung kurzlebiger Radikale durch Spin Trapping mit einem sterisch gehinderten Nitron / Spin Trapping with an Steric Hindered Nitrone
Authors: Sommermeyer Klaus , Seiffert Wolfgang
Published: March 2015

Spin trapping with 2,4,6-trimethoxy-N-t-butylnitrone improves the identification of short-lived free radicals at concentrations too low for their direct detection by ESR.
Notizen: Darstellung und Eigenschaften von Bis-heptaschwefelimido-sulfoxid, (S7N)2SO1 / Preparation and Properties of Bis-heptasulfurimido-sulfoxide, (S7N)2SO
Authors: Steudel Ralf , Rose Fritz
Published: March 2015

Thionyl chloride reacts with both S7NH and C6H5HgNS7 forming colorless crystals of (S7N)2SO whose infrared, Raman and mass spectrum are reported. The geometry at the N atoms is believed to be planar.
Notizen: Können Azetinone durch Alkin-Isocyanat-Additionen dargestellt werden? / Can Azetinones be Prepared by Alkyne-Isocyanate-Additions?
Authors: Dehmlow Eckehard V.
Published: March 2015

Literature claims about cycloadditions of benzoylisocyanate and acetylenes to form 1 b and lc could not be reproduced. Chlorosulfonylisocyanate plus 1-alkoxy-1-alkynes yield compounds 5 instead of azetinones (1).
Zur Elektronenstruktur hochsymmetrischer Komplexe der Lanthaniden und Actinoiden, I Magnetismus und Schwingungsspektren von Tris(tetraäthylammonium)-hexaisocyanato-ytterbium(III) / The Electronic Structure of Highly-Symmetrical Lanthanide and Actinide Complexes, I Magnetism and Vibrational Spectra of Tris(tetraethylammonium)-hexaisocyanate-ytterbium(III)
Authors: Amberger H.-D. , Fischer R. D. , Rosenbauer G. G.
Published: March 2015

The results of a combined infrared and Raman-spectroscopic analysis of the compounds [N(C2H5)4]3[Ln(III)(NCO)6] (Ln = Yb, Lu) confirms the assumption that the central ion Ln3+ is octahedrally surrounded by six linear isocyanate ligands. The recently determined temperature dependence of the magnetic susceptibility of the Yb-complex in the range 1.0 < T < 300.2 K is compatible with the crystal field (= CF) splitting pattern: 0 = Ε(Γ6) < Ε(Γ8) < Ε(Γ7) ≪ Ε(Γ'8) < Ε(Γ'7) and a spectroscopic splitting factor |gexp(Γ6)| = 2.576 [i.e. k(tlu) = 0.955].

Using the cubic first-order CF-functions, the energy differences ΔE(Γ8-Γ6) and ΔΕ(Γ7-Γ6) are fixed at 277 ± 10 and 650 ±130 cm-1 respectively. On this basis, the estimated ratio B4°/B6° of the two underlying cubic CF-parameters is discussed in terms of both “electrostatic” and “covalency” effects. This analysis has been used to interpret the paramagnetism of Cs2NaYbCl6 in terms of much larger CF-parameters than previously suggested
Die Kristallstruktur von Thiocyanato(2-dimethylaminoäthanolato)kupfer(II) / The Crystal Structure of Thiocyanato(2-dimethylaminoethanalato)copper(II)
Authors: Haase W. , Mergehenn R. , Krell W.
Published: March 2015

The crystal structure of the title compound has been determined from three-dimensional X-ray diffractometer data. Crystals are monoclinic, space group P21/c with 8 Cu(C4H10NO)SCN units in a cell of dimensions α = 11.951(4), b = 8.954(3), c = 16.805(6) Å, and β = 107.5(1)°. The structure was refined by least squares techniques to a final discrepancy factor of 0.041 based on 2234 observed independent reflexions.

The compound is polymeric with copper atoms alternately bridged by two oxygen atoms and two thiocyanato groups. The coordination geometry around each copper atom is distorted square pyramidal. The basal plane consists of the two bridging oxygen atoms (mean value Cu-O: 1.914(3) Å), the amino nitrogen atom (mean value Cu-N: 2.035(3) Å) and the nitrogen atom from the thiocyanato group (mean value Cu-N: 1.908(3) Å) while the axial coordination site is occupied by a sulfur atom from a thiocyanato group (mean value Cu-S: 2.979(2) Å) centrosymmetric to the first.

The magnetic susceptibility of the compound shows a broad maximum at 200 K
Zur Beziehung von Struktur und Reaktivität cyclischer CH-acider Verbindungen bei der Kondensation mit Orthoameisensäuretriäthylester.
Authors: Wolfbeis Otto S. , Junek H.
Published: March 2015

Condensation of triethylorthoformate with cyclic methylene-active compounds gives rise to ethoxymethylene-, bismethenyl- or triscompounds of type A, B or C resp. An explanation of this different behavior can be obtained by comparing the π-electron densities at the β-carbon atom of the exocyclic double blond of ethoxymethylen- and bismethenyl-compounds, which are calculated using HMO-theory. These calculationes show a limiting electron density, which can be used to explain the lack of further reaction to bis- and triscompounds, when certain heterocyclic active methylenes are used.

Reactions of some heterocyclic diketones have been studied and, their behavior found in agreement with theoretical concepts
Notizen: Mechanistic Implication of “LFER” in the Oxidation of Acetophenones by Vanadium(V)
Authors: Kelkar M. S. , Shanker R. , Baxore G. V.
Published: March 2015

A linear combination of the effect of substituents on pre-equilibrium and subsequent rate limiting step, K and k respectively, describes the structure reactivity, relationship of the form log k/k0 = -2.17σ++ 3.3 σ, where former corresponds to V(V)-ketone complex and the latter its rate limiting disproportionation
Crystal Structures of the High Pressure Phases ZnAs and CdAs
Authors: Clark J. B. , Range Klaus-Jügen
Published: March 2015

The structure of the high pressure compounds ZnAs and CdAs have been determined using Guinier film and counter methods. The compounds are orthorhombic, (space group Pbca; Z = 8), with α = 5.679(2) Å, b = 7.277(4) Å, c = 7.559(4) Å and α = 5.993(4) Å, b = 7.819(6) Å, c = 8.011(6) Å respectively.

ZnAs and CdAs are isostructural with the normal pressure phases ZnSb and CdSb, which are related to the high pressure phase Si III. Structural relationships are discussed including the Si III-diamond structure relationship.
Über die Reaktion von Phosphorylacetylenen mit Phosphanen / On the Reaction of Phosphoryl Acetylenes with Phosphanes
Authors: Fluck Ekkehard , Kazenwadel Werner
Published: March 2015

The reaction between dimethyl chloroacetylenephosphonate and tetramethyl acetylenediphosphonate with phosphanes is described. The starting materials and the reaction products are characterized by their NMR and IR spectra.
Reaktionen von 1-Aryl-3-alkyl-triazenen mit Lewis-Säuren in Benzol / Reactions of 1-Aryl-3-alkyl-triazenes with Lewis Acids in Benzene
Authors: Kreher Richard , Goth Kurt
Published: March 2015

The reaction of 1-phenyl-3-alkyl-triazenes with lewis acids in benzene has been examined in order to evaluate the mechanism of the reaction of alkyl azides with electrophiles in benzene. Evolution of nitrogen gives rise to the formation of the corresponding substituted anilines by intramolecular alkylation. Alkyl benzenes are the result of an intermolecular alkylation process.
Untersuchungen über Anthra-Glykoside aus Rhamnus-Arten, IV1. Die Struktur der Cascaroside von Rhamnus purshianus DC / Investigations of the Anthra-glycosides from Rhamnus species, IV1. The Structure of the Cascarosides from Rhamnus purshianus DC
Authors: Wagner Hildebert , Demuth Günter
Published: March 2015

The Cascarosides A, B, C and D, for the first time isolated by FAIRBAIRN et al. from the bark of Rhamnus purshianus DC, have been structurally elucidated as 8-O-β-D-glucopyranosides of aloin and 11-desoxy-aloin respectively by means of partial hydrolysis, NMR spectroscopy, sugar analysis and DC measurements.
Notizen: High Pressure Reactions, I Evidence for Two Concurrent Mechanisms in Lewis-Acid Catalyzed Alkylation of Aromatics with Olefins
Authors: Tiltscher H. , Lohmüller R.
Published: March 2015

A kinetic study was made of the primary step of the alkylation of benzene with propylene and ferric chloride as catalyst under homogeneous reaction conditions at several pressures up to 2 kbar. Initial reaction rate of cumene formation shows a minimum in the medium pressure range, thus indicating that product formation occurs via two different reaction paths with opposite pressure dependence.
Zirconium and Oxozirconium(IV) Formates
Authors: Paul Ram Chand , Baidya Om Bahadur , Kapoor R.
Published: March 2015

Tetraformatozirconium(IV), Zr(OOCH)4 and diformatoxozirconium(IV)dihydrate, ZrO(OOCH)2 · 2 H2O have been prepared by the reactions of tetrachlorozirconium(IV) and dichloroxozirconium(IV) with anhydrous formic acid, respectively. The compounds have been characterized by elemental analyses, molar conductance, thermogravimetry and infrared spectral data. The compounds are nonelectrolytes in nitrobenzene and have polymeric structures.
Umaminierungen am 2-Dimethylamino- [1.3.2] oxathiarsolan.
Authors: Adler Oswald , Kober Friedhelm
Published: March 2015

The reactions of 2-dimethylamino-[1,3,2]oxathiarsolane with secondary amines lead to the formation of 2-dialkylamino-[1,3,2]oxathiarsolanes. IR, 1H NMR and mass spectral data are presented and discussed.
Darstellung und Kristallstruktur der Hochdruckphase Tm2S3-II.
Authors: Range Klaus-Jürgen , Leeb Richard
Published: March 2015

Single crystals of the quenchable high pressure phase Tm2S3-II were grown from a TmJ3-flux at 10 kbar, 1600°C. The crystals are monoclinic, space group P21/m, with a = 11.110(5) Å, b = 3.874(3) Å, c = 10.872(5) Å, β = 108.88(2)° and Z = 4. In Tm2S3-II, which is isotypic with Er3ScS6, the four independent thulium atoms are coordinated by six (2 x), seven and eight sulfur atoms.
Untersuchungen über eine blaue Lösung von Molybdän(VI)-oxid in Schwefelsäure.
Authors: Kreusler Hans-Ulrich , Wiese Günther , Stüwe Wolfram
Published: March 2015

The change of the yellowish solution of MoO3 in concentrated sulfuric acid into a dark blue colour by diluting with water has its maximum at H2SO4 · 2,85 H2O. Spectralphotometric measures show a significant difference to the colour of solutions containing molybdenum-blues.
Alkali and Alkaline Earth Perchlorate and Picrate Complexes with Some Macrocyclic Polyethers
Authors: Tušek Lj. , Meider-Goričan H. , Danesi P. R.
Published: March 2015

Crystalline complexes of some alkali and alkaline earth perchlorates and picrates with macrocyclic polyethers have been synthesized. With the alkyl substituted aromatic macrocyclic polyethers bis(3,5-di-tert-butylbenzo)-18-crown-6 and bis(4-hexadecylbenzo)-18-crown-6 it was not possible to isolate all the complexes in the crystalline form. In fact the steric hindrance, caused by the alkyl substituents, affects the stability of the complexes and hinders the possibility of isolation. It has been observed that also the molecular structure and the electronic configuration of the anion are important factors in determing the formation of crystalline complexes. The complexes obtained were identified and characterized by elemental analysis, IR, UV and 1H NMR spectra, conductivity and x-ray powder analysis.
Markierte Verbindungen, XXIV Chloraustausch Antimon(III)-chlorid Hexachlorpropen in Systemen mit Elektronendonatoren.
Authors: Boberg Friedrich , Hanisch Ferdinand
Published: March 2015

The kinetics of the chlorine exchange between antimony (III)-chloride and hexachloropropene has been studied in systems SbCl3/C3Cl6/CH2Cl2/electron donor. Donors are benzene, toluene, ethylbenzene, n-propylbenzene, cumene, naphthalene, anthracene, biphenyl, p-terphenyl. A decrease of the velocity of the chlorine exchange ist effected by the donors. Studies with benzene as donor show, that the decrease depends only on the concentration of the donor. For benzene and alkylbenzenes a donor constant is defined which correlates with the Taft constant for the substituents.
Photoionization of Indole in Alkaline Aqueous Solutions at 77°K
Authors: Yamashita Shozi , Yoshida Mizuki , Tomita Giiti
Published: March 2015

The photoionization process of indole in alkaline aqueous solutions at 77°K and the recombination process of trapped electron with its mother molecule were investigated. The fluorescence spectrum of indole in these glassy media depended on the NaOH concentration; the disappearance of the 325 nm band at the NaOH concentrations higher than 5 M with the appearance of a fluorescence band at 375 nm. The latter emission is possibly ascribed to the fluorescence of indole anion formed by proton dissociation in the excited singlet state of indole. The intensities of the 375 nm band and the ESR signal due to trapped electrons were dependent on the NaOH concentration and increased steeply with increasing the NaOH concentration. There was a parallel relation between the indole anion concentration and the trapped electron density to some extent.

The dependence of the ESR signal intensity on irradiation intensity suggested that the photoionization of indole in alkaline aqueous solution occurred through a two photon process. The presence of a photoactive intermediate for absorbing the second photon was further investigated with simultaneous irradiation of two different wavelength lights.

The trapped electron was detrapped with the irradiation of visible light (e.g. 580 nm), and its recombination with mother molecule caused an emission with the same spectrum as indole phosphorescence. The molecular species of the photoactive intermediate in alkaline aqueous solutions seems to be the indole anion. The photoionization in NaOH aqueous solution at 77°K was also compared with that in methanolic glassy solution.
Synthesen mit Nitrilen, XLII Cyclisierungen azaloger Enaminoketone mit Malonsäuredinitril zu kondensierten Pyridazinen.
Authors: Zacharias Gert , Junek Hans
Published: March 2015

Condensation of 2-arylhydrazones of indandione-1,3 with malononitrile in alkaline medium leads to 3-aryl-1-cyano-5-dicyanomethylen-2-imino-2,3-dihydro-5 H-indeno[2,1-c]-pyridazines (2). Starting with 2-arylhydrazones of cyclohexanedione-1,3 the reaction is accompanied by dehydrogenation and 2-amino-4-cyano-8-dicyanomethylene-2-aryl-2,8-dihydro-cinnolines (5) are yielded.
Some New Tetrahydrothiopyrano [2,3-d] thiazole-2-thione Derivatives and their Biological Activities
Authors: Kassab Nazmi Abd Elatife , Abdallah Sanaa Osman , Ead Hamed Abdel Reheem , Zaki Doreya
Published: March 2015

The arylidene derivatives (1) of 3-phenyl-1,3-thiazolidine-2,4-dithione undergo 1,4-cycloaddition reaction with acrylonitrile, ethyl acrylate, ω-nitrostyrene, styrylethyl ketone and N-arylmaleimides leading to substituted tetrahydrothiopyrano-7 H[2,3-d]thiazole-2-thiones (2) and (3).

The bactericidal and fungicidal activities of the new products were tested.
Notizen: Die Kristallstruktur einer neuen Modifikation des Kaliumamids, KNH2.
Authors: Jacobs H. , Von Osten E.
Published: March 2015

In the temperature range from 54 to 75°Ca new modification of KNH2 was found, which crystallizes tetragonally a = 4.282 ± 0.003 Å, c = 6.182 ± 0.003 Å, and c/a = 1.444 (60°C), in P4/nmm - No. 129-, Z = 2,

2 K in 2c 0 1/2 z, z = 0.202(5),

2 N in 2c 0 1/2 z, z = 0.737(15). Its structure is of a deformed sodium chloride type.
Notizen: Homogene katalytische Hydrierung ungesättigter Verbindungen mit H2PtCl6 plus SnCl2 · 2 H2O in iso-Propanol.
Authors: Strohmeier Walter , Weigelt Luise
Published: March 2015

A catalytical system for homogeneous hydrogenation of unsaturated compounds, operating under mild conditions can be prepared with H2PtCl6-SnCl2 · 2 H2O and the additives HBr and H2O in iso-propanol. Reaction rates up to 32 mMol · l-1 · min-1 were observed. After hydrogenation of one batch new substrate can be injected several times without noticeable desactivation of the system. Hydrogenation rate of 2-tr-cis-hexene is only 0,5 times less than of 1-hexene. Mesityloxide is selectively hydrogenated regarding the double bond.
Notizen: Die Darstellung von Naphthacenchinonen aus Diels-Alder-Verbindungen des p-Benzochinons.
Authors: Lange Werner
Published: March 2015

Various naphthacenequinones can be synthesised by hydrogenation of the Diels-Alderadducts of p-benzoquinone with Zn/acetic acid followed by a condensation of the formed diketones with o-phthalaldehyde.
Über Oxocuprate, XIV Zur Kristallchemie von Sr2Cu3O4Cl2.
Authors: Grande Bernd , Müller-Buschbaum Hanskarl
Published: March 2015

The new compound Sr2Cu3O4Cl3 was prepared in melts of SrCl2. A single crystal X-ray examination (a = 546.2, c =1259.1 pm, space group D17
4h-I 4/mmm) shows that the octahedral distortion of the [Cu3O4Cl2]4--network cannot be explained only by the JAHN-TELLER effect.
Kalium-closo-tetradekanitrogen-dodekathio-dodekaphosphat(6-), K6 [P12S12N14].
Authors: Fluck Ekkehard , Lang Markus , Horn Franziskus , Hädicke Erich , Sheldrick George Michael
Published: March 2015

Preparation and properties of the title compound are described. The mechanism of formation is suggested in part. IR, Raman and NMR spectra are given and interpreted. The X-ray structural analysis is reported and structural features are discussed.
The Mass Spectra of Some Dialkylthiolsulfonates
Authors: Filby W. G. , Günther K. , Penzhorn R.-D.
Published: March 2015

The mass spectra of six symmetrically (R′=R) and three unsymmetrically (R′≠R) substituted dialkylthiolsulfonates have been determined. With the exception of the diethyl derivative the base peak is derived from direct fission of the sulfinyl S-R bond. Fission of the S-S bond with rearrangement and rearrangement of the alkyl residue are two further processes of importance enabling characterisation of the species.
Zur Reaktivität von C=N-Doppelbindungssystemen, VII. Synthesen von fluoreszierenden pyronokondensierten Heterocyclen / The Reactivity of the C=N-Double Bond Systems, VII. Syntheses of Condensed Pyronoheterocycles
Authors: Wolfbeis Otto S. , Ziegler Erich
Published: March 2015

The combined action of orthoformate and aniline upon 4-hydroxy-coumarin yields anilinomethylene chromon-2,4-dione, which reacts with ethyl cyanoacetate in DMF in the presence of KOH to give the pyronocoumarine (6a). Pyronoquinolones are obtained in a similar way.
Über Tetraalkylammonium-polyvanadate.
Authors: Fuchs Joachim , Mahjour Soroush , Palm Rosemarie
Published: March 2015

In the reaction of V2O5 with aqueous or alcoholic solutions of tetraalkylammoniumhydroxide the orange decavanadates (NR4)3H3V10O28, (NR4)4H2V10O28, (NR4)5HV10O28 (NR4)6V10O28 and colourless metavanadates can be obtained. The tetrabutylammoniumsalt [N(C4H9)4]3HV4O12 is the first known metavanadate with discrete polyanion. Its molecular weight was determined by vapor pressure osmometry in chloroform. The Raman spectrum is identical with the spectrum of a sodium metavanadate solution. The vibration spectra of the compounds are discussed and partial assignments were made.
Beiträge zur Chemie des Phosphors, 621 Zur Frage des 31P-kernresonanzspektroskopischen Nachweises von monomerem und dimerem Phenylphosphor und der Ringgröße von Organyl-cyclophosphanen.
Authors: Baudler Marianne , Carlsohn Burkhard , Böhm Wolfgang , Reuschenbach Goswin
Published: March 2015

The weak resonances at + 22 and + 49 ppm appearing in the 31P NMR spectrum of melts or solutions of (PPh)5 that have been attributed previously in the literature to “dimeric” and “monomeric phenylphosphorus” are caused by (PPh)6 and (PPh)4, respectively. This was proved by comparison with the 31P NMR parameters of related compounds and by 31P NMR spectroscopic investigation of authentic samples of (PPh)6 and (PPh)4, the latter of which was prepared in high yield from (Me3Si)PhP–PPh–PPh(SiMe3) and PhPCl2. (PEt)4 and mixed-substituted phenyl-ethyl-cyclotetraphosphanes exhibit similar chemical shifts as (PPh)4, corresponding mixed-substituted cyclohexaphosphanes have similar chemical shifts as (PPh)6. Generally, cyclophosphanes establish an equilibrium between (PR)n-species of different ring-size. Probably, the ring-interconversion proceeds via a multi-center mechanism. No 31P NMR spectroscopic evidence for the existence of free PPh or P2Ph2 under the conditions described could be detected. On thermolysis of (PEt)4 the existence of (PEt)3 was proved for the first time.
Diskussion chemischer Gleichgewichte.
Authors: Dubler Th. , Maissen C. , Calzaferri G.
Published: March 2015

By means of calculated examples it is demonstrated that chemical equilibria can be discussed in a much simpler way by writing the equations in matrix notation. Our basic idea is to treat a problem as a linear one as far as possible and to formulate the nonlinear part as side condition. The rank R* of the stoichiometry matrix proves to be very useful as well for the derivation as for the application of the phase rule.
Markierte Verbindungen, XXVI Das 1.2.3-Trichlorpropenylium-Ion als Intermediat bei der Fluorierung von 1.2.3.3-Tetrachlor-1-propen.
Authors: Boberg Friedrich , Voss Rainer
Published: March 2015

The sym. 1,2,3-trichloropropenylium ion is an intermediate on the reaction of 1,2,3,3-tetrachloro-l-propene with SbF3 to 1,2-dichloro-3,3-difluoro-1-propene. This is shown by the fluorination of 1,2,3,3-tetrachloro-(1,3-14C)-1-propene, with unsym. distribution of 14C, and studies with degradation products labelled with 14C.
The Reactions of Halogenocyclophosphazenes with Nitrogenous Bases
Authors: Shaw Robert A.
Published: March 2015

The reactions of hexachlorocyclotriphosphazatriene, N3P3Cl6, and to a lesser extent octachlorocyclotetraphosphazatetraene, N4P4Cl8, and other halogenocyclophosphazenes with primary, secondary, and tertiary amines, are described. The effect on the substitution pattern of variables such as the structure of the amine, nature of the reaction solvent, etc., are discussed in some detail. Attention is drawn to the importance of steric effects. Isomerisation reactions are referred to.

The physical properties of aminocyclophosphazenes and aminohalogenocyclophosphazenes are discussed in some detail. These include basicity studies, 1H and 31P NMR and 35Cl NQR studies, Faraday effect measurements, etc. Attempts are made to correlate the above properties with X-ray crystallographic studies and quantum chemical calculations. The distinction between ground state and perturbed state properties is emphasised.

Synthesis, structure, and properties of phosphazenylcyclophosphazenes and related compounds are described and a novel conformational behaviour is discussed and rationalised.
Pyrimidine Derivatives and Related Compounds, III / Synthesis of Some New Pyrazolo [1,5-a] pyrimidines and Pyrazolo [3,4-d] pyrimidine Derivatives
Authors: Elnagdi Mohamed Hilmy , Fahmy Sherief Mahmoud , Zayed Ezzat Mohamed , Ilias Mohamed Ajmal Mohamed
Published: March 2015

Whereas β-cyanoethylhydrazine (1) reacts with the β-ethoxy-α,β-unsaturated nitriles (2a—c) to yield the 5-amino-1-B-cyanoethylpyrazoles (8a—c), 1 reacts with anilinomethylenemalononitrile (2d) to yield 3-amino-1-B-cyanoethyl-4-cyanopyrazole (4; R=H; X=CN). 3a readily cyclised into the 5-amino-6,7-dihydropyrazolo[1,5-a]pyrimidine derivative (6) by the action of ethanolic guanidine. 6 was readily converted into the oxo derivative (7) by the action of acetic acid. 7 was also obtained by the action of 1% NaOH on 3a. On the other hand, 3b afforded a mixture of the pyrazolo[1,5-a]pyrimidine derivative (8) and the carboxylic acid (9) when treated with 1% NaOH solution.

3-Aminocrotononitrile (2e) reacted with 1 to yield the hydrazone derivative (12). The latter derivative was converted into the pyrazolo[1,5-a]pyrimidine derivative (14) by the action of acetic acid. On the other hand, the hydrochloride (15) was formed on treatment of 12 with acetic acid hydrochloric acid mixture.

Compounds 8 a, b reacted with carbon disulphide to yield the pyrazolo[3,4-d]-6 (7 H)-m- thiazinethione derivatives (16a,b). The latter were readily converted into the pyrazolo-[3,4-d]pyrimidine derivatives (17 a, b) by the action of aqueous NaOH solution.
Untersuchungen an quartären Pyridinium-Salzen, V Reaktionen mit substituiertem Azabicyclo [4.1.0]hepten.
Authors: Gündel Wolf-Hellmut
Published: March 2015

Syntheses and conversion of substituted azabicyclo[4,1,0]hepten are described.
Über Reaktionen mit Betain, ΧΠ. Das Verhalten von Brommalonsäure-diäthylester gegenüber tert. aliphat. Aminen / Reactions with Betaine, XII. The Reaction of Diethyl Bromomalonate with Aliphatic tert. Amines
Authors: Wittmann Helga , Sobhi Djamschid , Petio Franz A.
Published: March 2015

Diethyl bromomalonate (1) reacts with trimethylamine at 0°C to give the bromide salt of trimethylammoniummalonate (2), however, in the presence of methanol, ethanol or 1-butanol the bromide of ethyl trimethylammoniumacetate (3) is obtained under the loss of dialkyl carbonates. The analogous reaction of 1 with dimethylsulfide yields diethyl methylthiomalonate (5).
Notizen: Sulfen-Einschiebung bei der Darstellung von π-C5H5(CO)3WS(O)2CH3
1? / Sulfene Insertion in the Synthesis of π-C5H5(CO)3WS(O)2CH3?
Authors: Lorenz Ingo-Peter , Griesshammer Rainer
Published: March 2015

A new synthetic route for sulfinato complexes is reported: π-C5H5(CO)3WS(O)2CH3 can very easily be prepared from π-C5H5(CO)3WH, CH3SO2Cl and N(C2H5)3, a reaction in which sulfene (CH2=SO2) -insertion into metal-hydrogen-bonding may be involved.
Notizen: Oberflächenverbindungen von Übergangsmetallen, XVII / Surface Compounds of Transition Metals, XVII / Sauerstoffempfindlichkeit koordinativ ungesättigter Oberflächenverbindungen / Oxygen Sensitivity of Coordinatively Unsaturated Surface Compounds
Authors: Moeseler R. , Horvath B. , Lindenau D. , Horvath E. G. , Krauss H. L.
Published: March 2015

The oxygen partial pressure above supported, coordinatively unsaturated CrII, VIII, MoII and MnII species was measured with a ZrO2 cell. Within this series the pressure ranges from 10-6 to 10-11 ppm O2, with the MnII/SiO2 systems exhibiting the lowest values of 10-10.8 and 10-11.3. Other pertinent properties like chemiluminescence with O2 and catalytic activity in ethylene polymerisation are also indicated.

The manganese(II) absorption masses are thus particularly suitable for removal of traces of oxygen from liquids and gases in general but especially from polymerizable olefins.
Die Kristall- und Molekülstrukturen von Dichlor(methylthio)boran und Dibrom(methylthio)boran.
Authors: Pollitz Stefan , Zettler Frowin , Forst Detlev , Hess Heinz
Published: March 2015

The crystal structures of the title compounds were determined. Both compounds are isostructural and do not exist as dimers as previously assumed but as trimers in the form of six-membered rings in the chair conformation.

Mean values of the bond distances are B-Cl 1.80 A, B-Br 1.96 A, B-S 1.95 A, S-C 1.84 A.
Defined Intercalation Stages from Cathodic Reduction of MoS2 in Organic Electrolytes
Authors: Besenhard J. O. , Meyer H. , Schöllhorn R.
Published: March 2015

Cathodic reduction of MoS2 in DMSO electrolytes containing alkali cations A+ results in the formation of defined ternary phases A+0.125 (DMSO)y[MoS2]0.125- with highly mobile solvated interlayer cations. Reduction of MoS2 in DME electrolytes yields similar products.

Basal spacings are dependant on solvent type and on ionic radius of A+. Further reduction of these compounds is associated with irreversible processes.
Stoßaktivierungsmassenspektrometrie von Monoterpenen und Isomerisierung von C7H9
+-Ionen in der Gasphase.
Authors: Schwarz Helmut , Borchers Friedrich , Levsen Karsten
Published: March 2015

The molecular ions of ten monoterpenes show no or only minor isomerisation to a common intermediate or an equal mixture of structures prior to or during collisional activation. The C7H9+ions, however, from these monoterpenes and some other precursors exhibit the same abundance ratios for their collision induced decompositions. From the characteristic release of kinetic energy possible structures of the decomposing gaseous C7H9
+ions can be elucidated. It is shown that the ions eliminating H2 resp. CH4 possess a different structure in the transition state.
Katalytische Aktivität von homogenem und heterogenisiertem RhCI(PPh3)3 für die Hydrierung von Substraten ohne Solvens.
Authors: Strohmeier Walter , Hitzel Erich
Published: March 2015

With heterogenized RhCI(PPh3)3 fixed on glass wall of the reaction vessel mesityloxide, acrylicacidethylester and cyclohexene are hydrogenated without solvent at 50°C with high reaction rates and high turnover numbers. The catalyst, once prepared can be used for oxidation of substrates with molecular oxygen as well. Characteristic data to describe the activity of catalysts are suggested.
Die Lösungsmittelabhängigkeit der thermischen cis-trans-Isomerisierung von N-Benzylidenanilinen mit Donator/Akzeptor-Substituenten.
Authors: Berns U. , Heinrich G. , Gusten H.
Published: March 2015

Thermal cis →-trans isomerization of eight N-benzylideneanilines with donor and/or acceptor substituents in the para, para'-positions was studied in different solvents by observing the rapid relaxation to the thermodynamic stable trans isomer following flash photolysis. With the push-pull effect of the substituents in the direction of the N-aryl group the rate constant at 25°C is by three powers of 10 faster compared to the N–benzylideneaniline with opposite arrangement of substituents. The rate constants are independent of the nature of the substituents in the para-position of the benzylidene group. The rate constants of N-(4-nitrobenzylidene)-p-anisidine are linear functions of the solvent polarity scale based on solvatochromic shifts (Kosowers Z-value or Dimroths ET-value). With increasing push-pull effect of the substituents in the direction of the N-aryl group the rate constants do no longer depend on the polarity of the solvent. The observed solvent effects on the rates and the activation energies for thermal cis→ trans isomerization suggest that the transition state of the reaction is less polar than the ground state of the sterically hindered cis-N-benzylideneaniline, thus favouring an inversion mechanism to become operative with respect to the N-benzylideneanilines.
The Mechanism of Decay of the Radical HO—CH—CH2—OCOCH3 in Aqueous Solutions. A Conductometric Pulse Radiolysis Study
Authors: Koltzenburg G. , Matsushige T. , Schulte-Frohlinde D.
Published: March 2015

From conductivity changes following a 1 µs electron pulse applied to Ν2Ο saturated H2O or D2Ο solutions of acetic acid 2-hydroxyethyl esterthe rate constants of the monomolecular decay of the radical HO-ĊH-CH2-OCOCH3 (1) in H2O and of DO-ĊH-CH2-OCOCH3 in D2O were derived, reaction (1).

A value of k1 of 5.5 · 105 s-1 ± 25%, at 22 to 24°C, independent of the above solvents and of pH (or pD) was obtained. It is concluded that the rate determining step of reaction (1) is the heterolytic fragmentation of the carbon acetate bond in 1 followed by formation of H+.
2-Amino-3-hydroxy-4-methylthiazoliumchlorid. Ein neues Reagens zur Bestimmunung von Nitrit.
Authors: Entenmann G. , Herter H. , Lay H.
Published: March 2015

After diazotation 2-amino-3-hydroxythiazolium chlorides react with activated aromatic compounds to build azo dyes. In absence of coupling components 2-amino-3-hydroxy-4-methylthiazolium chloride gives a colour reaction with nitrite ions, which is suitable for photometric detection of nitrite in aqueous solution.
Notizen: Synthesis and Structural Investigation of an Unusual Double Hydrogen-Bridged Dimeric Cyclophosphazene Derivative
Authors: Bullen Graham J. , Dann Peter E. , Evans Moyra L. , Hursthouse Michael B. , Shaw Robert A. , Wait Keith , Woods Michael , Yu Hon Sum
Published: March 2015

The formation, 1H NMR spectroscopic and X-ray crystallographic investigations of a double hydrogen-bridged tricyclic system of a cyclotriphosphazadiene derivative,

[N3HP3(O)Cl2(NEt2)3]2

are described and discussed. This is the first neutral molecule having both cyclophosphazene and cyclophosphazane character to be structurally investigated.
Notizen: The Crystal Structure of N3P3C15(NPPh3) — a Novel Conformation in Phosphazenylcyclophosphazene Chemistry
Authors: Babu Y. Sudhakara , Cameron T. Stanley , Krishnamurthy S. S. , Manohar H. , Shaw Robert A.
Published: March 2015

An X-ray crystallographic structure investigation of pentachloro(triphenylphosphazenyl)cyclotriphosphazatriene, N3P3C15(NPPh3), reveals a novel conformation (type I) of the triphenylphosphazenyl group with respect to the adjacent ring segment. This is contrasted with the structure of gem. –N3P3CI4Ph(NPPh3), where a type II conformation is observed.
Notizen: Stereospecific Four-Bond Phosphorus-Phosphorus Spin Couplings in Phosphazenyl-Phosphazenes
Authors: Biddlestone M. , Keat R. , Rose H. , Rycroft D. S. , Shaw R. A.
Published: March 2015

Four-bond phosphorus-phosphorus coupling constants have been measured from the 31P NMR spectra of phosphazenylcyclophosphazenes. Their magnitude appears to be related to the conformation adopted by the phosphazenyl-group relative to the phosphazene ring.
Notizen: Über die Reaktion von C(NMe2)4 mit einigen Kohlensãurederivaten.
Authors: Petz Wolfgang
Published: March 2015

The reaction of C(NMe2)4 with CO2, COS and CS2 yields hexamethylguanidiniumsalts by transfer of a dimethylaminogroup to the carbonic acid derivate. 1H, 13C and IR spectra of the salts are discussed.
Notizen: Stereochemie der Abspaltung des Allylrestes aus chiralen Phosphoniumsalzen mit LiAlH4.
Authors: Luckenbach Reiner , Endres Wolfgang
Published: March 2015

Retention of configuration at phosphorus is found in the LiAlH4-induced fission of the allyl group from chiral phosphonium salts.
Reaktionsweisen des Tricarbonyl-eisen-cycloheptatrienid-Anions [C7H7Fe(CO)3]-.
Authors: Behrens Helmut , Geibel Kurt , Kellner Reinhard , Knöchel Hans , Moll Matthias , Sepp Erich
Published: March 2015

The reactions of [C7H7Fe(CO)3]- with alkyl chloroformates leads to the formation of ester substituted cycloheptatriene iron tricarbonyls 7-R-C7H7Fe(CO)3 and 1-R-C7H7Fe(CO)3. In contrast, similar reactions with (C2H5ECl give only the 7-isomers (C2H3)3E-C7H7Fe(CO)3

(E = Si, Ge). The synthesis of the doubly ester-substituted cycloheptatriene iron tricarbonyl (C2H5OCO)2C7H6Fe(CO)3 is described.
Die Kristallstruktur des Ca2As3.
Authors: Deller Klaus , Eisenmann Brigitte
Published: March 2015

The new intermetallic compound Ca2As3 has been prepared and its structure determined. Ca2As3 crystallizes monoclinic, space group P2/c, Z = 8. In this compound the As-atoms form As4- and As8-chains in the ratio 1:1 in the unit cell. The building principle of the “anionic” part of the structure with respect to the Ca-contents matches with the concept of ZINTL, KLEMM and BUSMANN, so the compound belongs to the ZINTL-phases.
Silbersalzreaktionen eines Thiatriazinrings.
Authors: Roesky Herbert W. , Zamankhan Hamid
Published: March 2015

1 reacts with SCl2 to yield 2. The methylsilane derivatives

[OC–NCH3–CO–NCH3-SO2–N]nSi(CH3)4-n

for n = 2, 3 and 4 are readily prepared from 1 and (CH3)2SiCl2, CH3SiCl3 and SiCl4. The IR and mass spectra are reported.
Über Oxocuprate, XVI Ba9Cu7O15Cl2 mit Cu in neuer Koordination.
Authors: Kipra R. , Müller-Buschbaum Hk.
Published: March 2015

Single crystals of Ba9Cu7O15Cl2 were prepared and investigated by X-ray diffraction methods. They crystallize with hexagonal symmetry (a =1125.7; c = 585.3 pm, Space group D6h
2-P6/mmm). Cu2+ has the well-known square O2--coordination. The squares are connected to rings of 6-fold symmetry. Another Cu2+ has a so for unknown coordination of 12 O2--neighbours. The differences in respect of other oxohalogenocuprates are discussed.
Notizen: Heterogene Hydrierungskatalysatoren aus RhCl(PØ3)3, RhCl3xH2O und IrCl4xH2O.
Authors: Strohmeier Walter , Hitzel Erich
Published: March 2015

Supported heterogeneous hydrogenating catalysts of high activity and stability can be prepared by reduction of RhCl(PØ3)3, RhCl3 x H2O or IrCl4 X H2O in cyclohexene or cyclohexane. [With these catalysts substrates are hydrogenated without solvent]. With these catalysts substrates are hydrogenated without solvent, and turnover numbers are higher 20,000.
Reactions of Benzofurans, V Formylation and Bromination of 2,3-Diphenylbenzofuran
Authors: Hishmat O. H. , Abd-El-Rahman A. H.
Published: March 2015

VILSMEIER-HAACK: formylation of 2,3-diphenylbenzofuran (la) gave the 5,6-diformyl derivative (lb). Huang-Minlon reduction of lb yielded the 5,6-dimethyl derivative (1c). Oxidation of 1c followed by hydrolysis the 2-hydroxy-4,5-dimethylbenzophenone (2b) was obtained.

Condensation of lb with primary amines gave the corresponding Schiff bases (3 a-j).

1a on bromination gave 5-bromo-2,3-diphenylbenzofuran (1 d), which on hydrolysis via oxidation yielded 2-hydroxy-5-bromobenzophenone (2 d). 1d was also obtained by condensation of benzoin and p-bromophenol in presence of sulphuric acid.

Conrad-Limpach reaction of 5-methoxy-6-amino-2,3-diphenylbenzofuran (1e) and ethyl acetoacetate gave 2,3-diphenyl-7-methyl-5-methoxy-9-hydroxy[2,3-f]furoquinoline via the azomethine (4).
Notizen: Hydrierung von ungesättigten Verbindungen, Aldehyden und Ketonen mit dem Katalysatorsystem NiCl2 · 6 H2O + NaBH4 in Dimethylformamid unter milden Bedingungen.
Authors: Strohmeier Walter , Steigerwald Hannelore
Published: March 2015

With a catalyst-system, prepared by reaction of NiCl2 · 6 H2O and NaBH4 in dimethylformamide a number of unsaturated compounds are hydrogenated under mild conditions quite efficiently. At 25°C hydrogenation of unsaturated ketones like mesityloxide is selectively regarding the double bond. Aldehydes are hydrogenated at 25 °C and some ketones at 60°C very slowly.
ZrSiO4 mit monokliner Baddeleyitstruktur?.
Authors: Walenta Kurt
Published: March 2015

A new compound having the same composition as zircon, ZrSiO4, but differing from it in its structure has been obtained by heating zircon particles to a temperature of 5000 to 10000°K. According to X-ray powder diffraction data the structure and within limits of error also the unit-cell dimensions are identical with that of monoclinic baddeleyite, ZrO2. This suggests that the baddeleyite lattice can not only accommodate 10 molecular % SiO2 as is already known for some time, but substantially more, unless it is assumed that some kind of submicroscopic exsolution of amorphous SiO2 has taken place.
Zur Kristallstruktur von Natriumplatinaten(IV).
Authors: Hauck Jürgen
Published: March 2015

Cubic γ-Na2PtO3 (α = 4.487 Å), Na4PtO4 (α = 4.52 Â) and tetragonal Na8PtO6 (α = 7.965, c = 4.053 Å) were prepared by thermal reaction of sodium oxide or peroxide with platinum powder. Similar as for α,β-Na2PtO3 and Na2PtO2 the crystal structures of the new compounds can be related to the sodium chloride structure with a partial ordered superstructure in Na8PtO6 or without long range ordering in γ-Na2PtO3 and Na4PtO4.
Über Oxocuprate, ΧVIII. Zur Kristallstruktur von Sr2Cu3O4Br2.
Authors: Grande B. , Müller-Buschbaum Hk.
Published: March 2015

Sr2Cu3O4Br2 was prepared and examined by single crystal X-ray work. It is isotypic with Sr2Cu3O4Cl2; space group D4h
17- I4/mmm with a = 548.9 and c = 1330.6 pm. A discussion of the result in respect of the octahedral distortion is given.