bluuebunny/crossref_metadata_2025_split huggingface dataset:
Novel Rearrangement of 5-Arylazo-2-thiohydantoin Derivatives with Alkali and Aromatic Amines
Authors: Shalaby A. F. A. , Daboun H. A. , Abdel Aziz M. A. 
Published: February 2015

Abstract
5-Arylazo-2-thiohydantoin derivatives (2a,c) were cleaved and rearranged by aqueous sodium hydroxide to give the corresponding 1-aryl-⊿2-1,2,4-trazole-5-imino-3-carboxylic acids (3a-c). 3 a was decarboxylated to 1-phenyl-⊿2 -1,2,4-triazoline-5-imine (5). Hydrolysis of 5-arylazo-1-phenyl-2-thiohydantoins (6a-c) behaved in different manner affording 1-aryl-4-phenyl-⊿2 -1,2,4-triazoline-5-thione-3-carboxylic acids (7a-c). Fusing (2a-c) with aromatic amines at high temperature gave the corresponding anilides (8a-h). Treatment of 5-arylidene-2-thiohydantoin derivatives (9a-c) with hydrazine hydrate gave colourless products of thioureido cinnamic acid hydrazide derivatives (10a-c), while refluxing 5-arylidene-2-methylmercaptohydantoin (11a-d) with hydrazine hydrate and/or benzo-phenone hydrazone gave the corresponding glycocyamidine derivatives (12a-g).
Synthesis of Xanthone-O-glycosides, I Synthesis of 3-0-β-Glycosides
Authors: Chari V. M. , Klapfenberger R. , Wagner H. 
Published: February 2015

Abstract
The synthesis of hydroxy-xanthone-3-O-β-glycosides by condensation of the appropriate aglycone and the acetyl-α-D-glycosyl bromide in pyridine solution in presence of silver carbonate is described. The naturally occurring l-hydroxy-3-O-β-primeverosyl-7-methoxy xanthone (gentioside) has been synthesized and its structure thereby confirmed.
Strontiumchromat(V, VI), Sr2,67⃞0,33(CrO4)1,33(CrO4)0,67, eine Hochtemperaturphase mit Defekt-Bariumphosphat-Struktur / Strontiumchromate(V, VI), Sr2,67⃞0,33(CrO4)1,33(CrO4)0,67, a High- Temperature Compound with Defect-Bariumphosphate Structure
Authors: Hartl K. , Braungart R. 
Published: February 2015

Abstract
Black hexagonal platelets growing on strontiumoxide in the presence of chromium (III)-oxide and air at temperatures from 1250 to 1400 °C have been shown to belong to the rhombohedral space group R3̅m. In hexagonal orientation the elementary cell has the axes a0 = 1115.8 ± 0.9 pm and c0 = 4037 ± 3,6 pm and Z = 24, Dx=4.26. Structurally the compound is closely related to Ba3(PO4)2, with the exception, that there are defects in the metal sub-lattice. At temperatures below 1200 °C Strontiumchromate(V, VI) decomposes into the dis-crete chromates(V) and -(VI). At temperatures from 113 to 338 K the compound is an electronic semiconductor with an activation energy of 0.26 eV.
Molekül-und Elektronenstruktur des Thioheteroanions [S2 WS2CoS2WS2]2- / Molecular and Electronic Structure of the Thiohetero Anion [S2WS2CoS2WS2]2-
Authors: Müller A. , Mohan N. , Bögge H. 
Published: February 2015

Abstract
The crystal and molecular structure of [(C6H5)4P]2[Co(WS4)2] was determined from single crystal X-ray diffraction data (space group P21/c with a = 18.542(4), b = 15.443(2), c= 18.713(2) Å, β= 108.73(1)°, Z = 4). In the complex anion Co is coordinated by two bidentate chelating WS4
2- anions, with a nearly tetrahedral surrounding of Co. The bond lengths in the planar metal sulfur ring CoS2W are Co-S = 2.26 Å and W-S = 2.22 Å, while the terminal W-S bonds are 2.14 Å.
Photoelectron Spectra of Dithiapropellanes
Authors: Kobayashi Michio , Gleiter Rolf 
Published: February 2015

Abstract
The photoelectron spectra of the dithiapropel-lanes 1 to 5 have been recorded. The first bands have been assigned by comparison with the PE spectra of cyclic thioethers. The resonance inte-gral between the 3p orbitals of the sulfur centers in 1 to 5 is found to be -0.15 to -0.25 eV.
Die Kristallstruktur von Bis(eyclopentadienyl)mangan, eine polymere Verbindung mit Cyclopentadienyl-Brücken /The Crystal Structure of Bis(cyclopentadienyl)manganese, a Polymerie Compound with Cyclopentadienyl Bridges
Authors: Bünder Wolfgang , Weiss Erwin 
Published: February 2015

Abstract
The dark brown anti-ferromagnetic modification of (C5H5)2Mn crystallizes ortho-rhombic, space group Pna21 (or Pnam) with a= 1402.7(2), 6 = 582.9(1), c = 996.5(1) pm and Z = 4. It forms polymer chains with a zigzag arrangement of C5H5Mn units and additional bridging C5H5-rings between adjacent ions. The normals to the planes of the C5H5-bridges form an angle of 25° to the Mn-Mn-axes. All Mn-C bond distances are longer than expected for covalent bonds, suggesting essentially ionic bonding in agreement with the magnetic behaviour of (C5H5)2Mn. The observed antiferromagnetism is attributed to interactions between the manganese ions via the C5H5-bridges.
Darstellung und Eigenschaften von und Reaktionen mit metallhaltigen Heterocyclen, I Metallorganische Komplexe von Mangan und Rhenium mit zwei funktionellen Zentren /Preparation and Properties of and Reactions with Organometallic Heterocycles, I Organometallic Complexes of Manganese and Rhenium with two Functional Centres
Authors: Lindner Ekkehard , Au Günter von , Eberle Hans-Jürgen 
Published: February 2015

Abstract
The binuclear anions Na2[(OC)4MP(O)R2]2 (2a, a′, b, b′) [M = Mn: R = CH3 (a), C6H5 (a′); M = Re: R = CH3 (b), C6H5 (b′)] can be obtained quantitatively by reduction of the phosphinic acid complexes (OC)4BrMP(OH)R2 (1a, a′, b, b′) with sodium amalgam in ether. While the manganate anions 2 a, a′ can be transformed with excess sodium into the mononuclear salts Na2[(OC)4MnP(O)R2] (3a, a′), with two nucleophilic centres, the corresponding anions 2 b, b′ eliminate CO to give sparingly soluble species. From 3 a, a′ and dimethylsulphate the doubly methylated compounds CH3Mn(CO)4P(OCH3)R2 (4a, a′) are obtained. The rhenium derivatives CH3Re(CO)4P(OCH3)R2 (4b, b′) are formed only in very poor yields from 2 b, b′ and dimethylsulphate under reductive conditions. The IR, 1H NMR, and mass spectra are discussed.
Synthese und chemischer Transport ternärer Verbindungen, untersucht am Beispiel CoO + Nb2O5 = CoNb2O6 /Synthesis and Chemical Transport of Ternary Compounds, Investigated with CoO + Nb2O5 = CoNb2O6
Authors: Schäfer Harald , Trenkel Marita 
Published: February 2015

Abstract
Chemical transport reactions (1273 → 1073 K) with CoO, Nb2O5 or CoNb2O6 using TeCl4 as transport agent have been made. The experimental results are compared with thermodynamic calculations. General rules for the treatment of chemical transport calculations concerning ternary compounds are given.
Vier-und fünfgliedrige Phosphorheterocyclen, XXXIV Cycloaddukte aus Phosphazenen der Koordinationszahl 2, 3 und 4 /Four-and Five-Membered Phosphorus Heterocycles, XXXIV Cycloadducts from Phosphazenes of Coordination Number 2, 3, and 4
Authors: Schmidpeter Alfred , Criegern Thomas von 
Published: February 2015

Abstract

Dimethyl azaphosphole (la) and aminoiminophosphine (2) give the first example of a [2 + 2]-Cycloaddition of a2- and c^-phosphazenes. The resulting diazadiphosphetidine (4) dissociates reversibly. For the corresponding cycloadduct from l a and the aminodiiminophosphine (3) a rapid exchange of the exocyclic imino group and the ring nitrogen via a zwitterionic form is observed.
Photochemical Reductive trans-Elimination from trans-Diacidotetracyanoplatinate(IV) Complexes
Authors: Vogler A. , Kern A. , Fußeder B. , Hüttermann J. 
Published: February 2015

Abstract
Upon CT excitation the complex ions trans-[Pt(CN)4N3X]2- and trans-[Pt(CN)4X2]2- (X = Cl and Br) undergo a reductive trans-elimination with formation of [Pt(CN)4]2- and two ligand radicals in the photoprimary step. The formation of a Pt(III) intermediate is not observed. Due to the stability of [Pt(CN)4]2-, recombination reactions regenerating the starting complex are efficient if the ligand radicals are not scavenged. For the azide complexes the high quantum yields for the production of [Pt(CN)4]2- are explained by the instability of azide radicals. For trans-[Pt(CN)4X2]2-, the recombination is efficient in aqueous solution, while in ethanol the halogen atoms are scavenged by hydrogen abstraction. The sequence of steps following CT excitation can be explained by a potential energy diagram.
Halogeno-und Pseudohalogeno-tris(pentahaptocyclopentadienyl)uran(IV)- Komplexe als Lewis-Säuren: Darstellung und Struktur trigonal-bipyramidaler Uran-Organyle des Typs [(η5 -C5H5)3UXL] / Tris(pentahaptocyclopentadienyl)uranium(IV) Halides and Pseudohalides as Lewis-Acids: Preparation and Structure of Uranium Organyls [(η5 -C5H5)3UXL] with Trigonal-Bipyramidal Coordination
Authors: Fischer R. D. , Klähne E. , Kopf J. 
Published: February 2015

Abstract
The first two examples of a novel series of organo-actinide complexes, [Cp3UXL] (Cp = η5 -C5H5, X = halide or pseudohalide anion, L = uncharged Lewis base), are described. The X-ray structure analysis of the system with X = NCS and L = CH3CN confirms an almost linear alignment (H3)CCNUNCS along with the coplanarity of the three Cp ring normals. The remarkable Lewis acidity of certain Cp3UX-compounds appears to be essential for the formation of oligomeric species [Cp3UX]∞ as well as for specific reactions of monomeric CP3UX.
Bifunktionelle Acyl(diorganyl)phosphane und ihr Verhalten gegenüber molekularem Sauerstoff / Bifunctional Acyl(diorganyl)phosphanes and their Behavior Towards Molecular Oxygen
Authors: Lindner Ekkehard , Vordermaier Gottfried 
Published: February 2015

Abstract
The bifunctional acylphosphanes RC(O)P(Ph)-(CH2)2-(Ph)PC(O)R (1 a-c) [R = CH3 (a), CF3 (b), C5H6 (c)] are obtained from [NaP(Ph)CH2-]2 and the corresponding acid chlorides RC(O)Cl. Etherical solutions of 1 a-c with molecular oxygen easily can be transformed into the dioxides [RC(O)P(O)(Ph)CH2-]2 (2a-c). In contrast to the monofunctional acyl(diaryl)phosphane oxides 2 a-c do not react with water at 25 °C. The 31P, 19F, 1H NMR and IR spectra of the new compounds 1, 2 a-c are discussed.
Verbindungsbildung im System Ag2S-GeS2-AgI / Compound Formation in the System Ag2S-GeS2-AgI
Authors: Nagel Alois , Range Klaus-Jürgen 
Published: February 2015

Abstract
Besides the well-known argyrodite (Ag8GeS6), the new compound Ag2GeS3 could be synthesized from Ag2S-GeS2 mixtures. Ag2GeS3 crystallizes in an orthorhombic variant of the Wurtzite structure. Treatment of Ag2GeS3 in a AgI/AgCl-eutectic yields the quaternary compound Ag7GeS5I. Crystal data for Ag7GeS5I and some analogous compounds are given.
Synthesis of 5,6-Diaryl-1,2,4-triazines
Authors: Soliman Farid S. G. , Labouta Ibrahim M. , El Sebai A. Ibrahim , El Dine S. A. Shams 
Published: February 2015

Abstract
The synthesis of 6-(4-methoxyphenyl)-5-phenyl-3-oxo-2,3-dihydro-1,2,4-triazine (5a) from 4-methoxybenzoin, 4-methoxybenzil, or 4-methoxybenzoin semicarbazone and semi-carbazide hydrochloride is reported. The condensation of 4-methoxybenzil with thiosemi-carbazide yielded 6-(4-methoxyphenyl)-5-phenyl-3-thioxo-2,3-dihydro-I,2,4-triazine (5b) which was converted to its 3-oxo analogue 5 a with acetic anhydride. Reduction of 5 a and 5 b with zinc and aqueous acetic acid led to the corresponding 2,3,4,5-tetrahydro-1,2,4-triazines 6 a and 6b, respectively. Oxidation of 5 b with iodine in sodium carbonate solution afforded bis [6-(4-methoxyphenyl)-5-phenyl-1,2,4-triazin-3-yl]disulphide (7). Analogous triazines were prepared by condensing 3,3'-diiodobenzil with semicarbazide hydrochloride or thiosemicarbazide.
Carbenium Periodide, I / Carbenium Periodides, I
Authors: Lecea M. J. Volz-de 
Published: February 2015

Abstract
Carbocations of the tri-phenylmethylseries give with In - salts which are characterized by the natur of the anion. The preparation and general physical, spectral and chemical properties of tris-(4-dimethylaminophenyl)-carbenium-triiodid (1), a salt of crystal violet, and bis-(4-dimethylaminophenyl)-phenyl-carbenium-triiodid (2), a salt of malachite green, are described. The structure of the cations and anions of these carbeniumsalts is determined from their spectral data.
Tri(tert-butyl)phosphinoxid, -imin, -methylen und -boran / Tri(tert-butyl)phosphine Oxide, Imine, Methylene and Borane
Authors: Schmidbaur Hubert , Blaschke Günter 
Published: February 2015

Abstract
Tri(tert-butyl)phosphine Oxide, Imine, Methylene, Borane Tri(tert-butyl)phosphine oxide, imine, methylene and borane have been prepared and their properties investigated. The imine is chemically inert due to strong steric hindrance. Its thermal decomposition at 200 °C leads to tri(tert-butyl)-pliosphine, in contrast to the methylene analogue which undergoes reductive elimination of isobutene. Both the oxide and borane are thermally very stable (> 250 °C).
Austauschreaktionen an komplexgebundenen Liganden von Elementen der V. Hauptgruppe, VI [1]. Lithiierung von η5-C5H5Mn(CO)2PH3 / Exchange Reactions at Complexed Ligands of Elements of Group Vb, VI [1]. Lithiation of η5-C5H5Mn(CO)2PH3
Authors: Höfler Mathias , Hausmann Heinz , Schneider Annegret 
Published: February 2015

Abstract
The metallation of η5 -C5H5Mn(CO)2PH3 with excess n-butyllithium and consecutive reactions with CH3I and (CH3)3SiCl yield the complexes η5 -C5H5Mn(CO)2PR3 (R = CH3, Si(CH3)3). The product of the lithiation is proposed to be η5-C5H5Mn(CO)2PLi3.
Über eine neue Modifikation von As2O5/On a New Modification of As2O5
Authors: Jansen Martin 
Published: February 2015

Abstract
High temperature Guinier photographs of As2O5 indicate a continuous phase transition to HT-As2O5, which is accomplished at 305 ± 3 °C. The crystal structure of HT-As2O5 has been derived from the low temperature form; space group and lattice constants are P41212-D4
4 and a = 857.2 pm, c = 463.6pm (310 °C), respectively. According to symmetry considerations, the phase transition is expected to be of pure ferroelastic-paraelastic type (422F 222).
Kinetics and Mechanism of Oxidation of Thiocyanate Ion by Sodium N-Chloro-4-methyl Benzene Sulphonamide in Alkaline Medium
Authors: Mahadevappa D. S. , Gowda B. T. , Gowda N. M. M. 
Published: February 2015

Abstract
Kinetics of oxidation of potassium thiocyanate by the oxidant chloramine-T (CAT) in presence of NaOH has been studied at 30 °C. At low substrate concentrations, the approximate rate law is, - d[CAT]/dt = k[CAT][KNCS]/[NaOH]2 . At higher substrate concentrations, the rate law simplifies to, -d[CAT]/dt = k[CAT]/[NaOH]. Ionic strength and addition of p-toluene sulphonamide have negligible influence on the rate. The rate of reaction decreases in D2O medium and the value of the inverse solvent isotope effect, kH2O/kD2O is 0.46. The reaction has been studied at different temperatures and the activation parameters have been calculated.
The Alkyl Inductive Effect. I. Relations between σI*, σ* and ρI ρ* for H and Alkyl Groups; σI Values from the Size and Branching of R
Authors: Levitt Leonard S. 
Published: February 2015

Abstract
For alkyl groups it is shown that new inductive substituent constants, σI (R), can be calculated accurately from previously obtained polar substituent constants, σ*(R), from the simple relation σI(R) = σI (Me) [I-2σ* (R)]. In similar fashion, the two reaction constants are related by ρI/ρ* = σ* (H)/σI (Me) = 10.6. Many new σI values are presented for groups for which no previous estimate has been available. The attentuation of σI (R) with alkyl size for n-alkyl groups is shown to be a function of the number of C atoms, nc: σI(R) = -0.137 nc/(2nc + 1). The effect of branching of R is also discussed.
Friedel-Crafts -Alkylierungen mit Cu2+ -Bentonit/Friedel -Crafts -Alkylations with Cu2+ -Bentonite
Authors: Lotz W. W. , Gosseick J. 
Published: February 2015

Abstract
It is shown that Cu2+ -bentonite produces high yields of mono-t-butyl-benzene in Friedel-Crafts-alkylation. The ratio of mono-and di-product is investigated in dependence of the content of water in the bentonite: dry Cu2+ -bentonite produces high yields of mono-product, moistered Cu2+ -bentonite leads to di-alkylated products.
Crystal and Molecular Structure of Bis(N,N,N′,N′ -tetramethyl-1,4-diaminobenzeniumyl) [Wurster s Blue Cation]-tetracyanoplatinate(II)-mono-hydrate
Authors: Endres H. , Jentsch W. , Keller H. J. , Martin R. , Moroni W. , Nöthe D. 
Published: February 2015

Abstract
The title compound crystallizes in the monoclinic space group A 2/m (C2h
3) with a = 10.61(3) Å, b = 9.511(5) Å and c = 16.47(5) Å, β = 124.2(1)° and two formula units in the unit cell. The structure was solved by Patterson and Fourier methods and refined by least squares to R = 0.071 based on 1251 observed intensities. The organic cations are slightly distorted and are arranged in dimers along the crystallographic a-axis. There are “mixed stacks” of the planar [Pt(CN)4]2− units which are separated from each other by the WB2
2+ dimers along b. There is IR-evidence for the formation of hydrogen bridges between [Pt(CN)4]2− units and the crystal water during the modification change of the compound at room temperature.
Struktur und Schwingungsspektren von Monomolybdaten und Monowolframaten organischer Kationen / Structure and Vibrational Spectra of Monomolybdates and Monotungstates with Organic Cations
Authors: Thiele Axel , Fuchs Joachim 
Published: February 2015

Abstract
The crystal structures of dicyclohexylammonium-monomolybdate dihydrate [(C6H11)2NH2]2MoO4 · 2 H2O, (I), cyclohexylammonium-monomolybdate, (C6H11NH3)2MoO4, (II) and tert-butylammonium-monotungstate, (C4H9NH3)2WO4, (III), were elucidated. In I the anion has nearly tetrahedral structure, in II one Mo-O distance is significantly shorter than the other three, and in III all four W-O distances are different. In spite of the variety of structures the following basic principles are recognizable: 1) Each hydrogen atom of the cationic amino groups as well as of the water of crystallization forms hydrogen bridges. 2) Never are oxygen atoms of the same MoO4 connected by these bridges, but always oxygen atoms of neighbouring MoO4 units. 3) From an oxygen atom emanate either two or no hydrogen bridge. For the investigated molybdates (tungstates) there are in all instances isomorphous tungstates (molybdates). The number and position of the vibrational bands is in good agreement with the observed anion symmetry Td, C3v and C1, respectively.
Synthesen und Reaktionen von 4-Bora-2.6-diphospha-1.3.5-triazenen Cyclische Borbetaine / Synthesis and Reactions of 4-Bora-2,6-diphospha-1,3,5-triazenes Cyclic Boron Betaines
Authors: Binder Herbert , Palmtag Jürgen 
Published: February 2015

Abstract
By substitution of chlorine in the title compound 2,2,4,4,6,6-hexachloro-3,5-dimethyl-4-bora-2,6-diphospha-1,3,5-triazene (1) new members of this class of compounds are synthesized. In most cases reaction starts first on the boron site. The ring reactivity can be accounted for in terms of the charge distribution in the heterocycle 1. In 1 the coupling 2 J(31 P-N-11 B) could be detected for the first time. A mechanism for the ring formation is discussed.
Phosphinsubstituierte Carbonyl-Seleno-Komplexe des Mangans und Rheniums Phosphine / Substituted Carbonyl Seleno Complexes of Manganese and Rhenium
Authors: Küllmer Volker , Röttinger Erika , Vahrenkamp Heinrich 
Published: February 2015

Abstract
The selenium bridged complexes [(CO)4M-SeX]2 (M = Mn, Re; X = H, SnMe3) were converted by trimethylphosphine to the dimers [Me3P(CO)3M-SeX]2 and/or the monomers (Me3P)2(CO)3M-SeX. The obtained Se-SnMe3 compounds reacted with HCl to form the SeH compounds. The structures of the new complexes were deduced from their IR and NMR spectra. [(Me3P)2(CO)3Re]2Se, the first monobridged bis-carbonylmetal chalcogenide, was obtained as a byproduct and confirmed by a crystal structure analysis.
13C-und 119Sn-NMR-Spektren von Thienylstannanen / 13 C and 119 Sn NMR Spectra of Thienylstannanes
Authors: Wrackmeyer Bernd 
Published: February 2015

Abstract
The assignment of some 13 C chemical shifts in 2-thienylstannanes has to be reversed. Proton coupled 119 Sn NMR spectra are shown to be useful to detect long range Sn-H coupling, not readily obtained from complex 1H NMR spectra.
Ternäre Chalkogenide M3M2′X2 mit Shandit-Struktur / Ternary Chalcogenides M3M2′X2 with Shandite-Type Structure
Authors: Zabel Manfred , Wandinger Sigrid , Range Klaus-Jürgen 
Published: February 2015

Abstract
Metal-rich ternary chalcogenides M3M2′X2 (M = Ni, Co, Pd, Rh; M′ = In, Tl, Pb, Sn; X = S, Se) with Shandite-type structure were synthesized from mixtures of the elements and/or binary components. A single-crystal investigation on Co3ln2S2 verifies the rhombohedral unit cell of Shandite-type compounds, originally postulated by Peacock and McAndrew (Crystal data for Co3ln2S2: Rhombohedral, space group R3̄m; a = 549,31 (6) pm, a = 57.89°, Z= 1; 3 Co in 3d, 1 In(l) in 1 a, 1 In(2) in 1 b, 2 S in 2c with x = 0.2790).
Cis-trans-Isomere von Diazadiphosphetidin-Derivaten: Fünf Kristall- und Molekülstrukturen / Cis-trans Isomers of Diazadiphosphetidine Derivatives: Five Crystal and Molecular Structures
Authors: Pohl Siegfried 
Published: February 2015

Abstract
The crystal structures of the compounds [R3CP(X)NR]2(R= CH3; X=S, Te for cis isomers and X= lone pair, S, Te for trans isomers) (2-6) were determined from single crystal X-ray data. The four-membered P-N rings in the cis isomers 2 and 3 show significant deviations from planarity attributed to steric overcrowding in the molecules.The trans isomers 4-6 are planar. The P-N bond lenghts (mean values for 2-6:171.4, 170, 171.6, 169.2 and 168.3 pm)in the cis isomers are not significantly different from the corresponding lengths in the trans isomers 5 and 6.
Reactions with Cyclic Amidenes III: Synthesis of Some New Fused Pyrazole Derivatives
Authors: Elnagdi Mohamed Hilmy , Kandeel Ezzat Mohamed , Sadek Kamal Usef 
Published: February 2015

Abstract
Diazotised 5-amino-3-hydroxy-4-phenylazopyrazole (1 a) and 3,5-diamino-4-phenylazo-pyrazole(1 b) coupled with active methylene reagents to yield the pyrazolo[1,5-c]-as-triazine derivatives (3a, b-5 a, b). On the other hand coupling of diazotised 1 a, with β-naphthal has afforded the acyclic azo derivative(6).
Whereas diazotised 1 a underwent intramolecular cyclisation into the pyrazolo[1,5-c]-1,2,3,4-tetrazine derivative (3)on attemptet addition to acrylonitrile, diazotised 1 b reacted with acrylonitrile under the same conditions to yield the pyrazolo[1,5-c]-pyridazine derivative (4).
Compounds 1 a, b reacted with benzoylisothiocyanate to yield the pyrazol-5-ylthiourea derivatives (10 a, b). Where as 10 a readily cyclised into the pyrazolo[3,4-c]-as-triazine derivative (11) on refluxing with pyridine, compound 10 b hydrolysed under the same conditions into the pyrazol-5-ylthiourea derivative (12).
Keto-enol Tautomerism in 4,7-Dioxo-4,5,6,7- tetrahydroindoles
Authors: Malesani Giorgio , Quintily Ugo , Chiarelotto Gianfranco 
Published: February 2015

Abstract
The tautomeric equilibria of 4,7-dioxo-4,5,6,7-tetrahydroindoles have been investigated by nuclear magnetic resonance spectroscopy. Proton chemical shift measurements have been made for a series of alkyl or arylindole derivatives, and equilibrium constants ([enol]/[keto]) have been determined. The effect of solvent on the enol-keto equilibria has been studied.
Darstellung und Struktur von NaAlSi und NaAlGe / Preparation and Structure of NaAlSi and NaAlGe
Authors: Westerhaus Wolfgang , Schuster Hans-Uwe 
Published: February 2015

Abstract
The intermetallic compounds NaAlSi and NaAlGe have been prepared and their structure has been determined by powder data. They crystallize in an anti-PbFCl-type lattice with the following cell dimensions:
NaAlSi:
a = 413.5 pm, c = 737.9 pm, c/a = 1.785;
NaAlGe:
a = 416.4 pm, c = 742.7 pm, c/a = 1.784.
Notizen: Konkurrenzreaktionen einiger tricyclischer Diene zur [2+2]PhotocycIoaddition / Competitive Reaction of Some Tricyclic Dienes to [2+2]Photocycloaddition
Authors: Parlar H. 
Published: February 2015

Abstract
The UV-behaviour of some chlorinated tri-cyclic dienes (1 a-e) was studied in acetone. Cycloaddition (2 a-b and 2 d-e), hydrogen-transfer (3 c′ and 3 d) and photo ene-(3 c)-reaction products could be isolated and identified with the help of spectroscopic methods.