bluuebunny/crossref_metadata_2025 huggingface dataset:
Molekül- und Kristallstruktur von C7H7Mo(CO)2-SnCl3 / The Crystal Structure of C7H7Mo(CO)2-SnCl3
Authors: Ziegler M. L. , Sasse H.-E. , Nuber B.
Published: March 2015

The structure of the title compound has been determined from three dimensional X-ray data by Patterson and Fourier methods. The crystals are orthorombic, with unit cell dimensions a = 1181,50 pm, b = 943,68 pm, c = 1181,50 pm, space group D2h
16 and Z = 4. Least squares refinement, by use of 1540 independent reflections measured on a diffractometer has reached R = 5,9%.

There are discrete C7H7Mo(CO)2 SnCl3 molecules, the molybdenum-tin bond has been dicussed together with the corresponding bonds in other C7H7Mo(CO)2 SnR3 compounds.
Ein Ammonium(2:5)-molybdat aus wäßriger Lösung / An Ammonium(2:5)-molybdate from Aqueous Solution
Authors: Hunnius Wolf-Dietrich
Published: March 2015

The preparation of ammonium(2:5)-molybdate from aqueous solution is described. The Raman and infrared spectra show great resemblance to the spectra of ammonium(3:8)-molybdate tetrahydrate. As first intermediary phase by thermal decomposition the polymeric ammonium octamolybdate is formed.
Hochdruckumwandlungen der Alkalithioindate KInS2, RbInS2 und CsInS2 / High Pressure Transformations of the Alkali thioindates KInS2, RbInS2 and CsInS2
Authors: Range Klaus-Jürgen , Mahlberg Günther
Published: March 2015

New modifications of KInS2 and RbInS2 were found after high pressure treatment and quenching to ambient conditions. The tetragonal modifications KInS2-II and RbInS2-II are isotypic with TISe. KInS2-II is metastable at all p,T-conditions investigated. The stable high pressure modification KInS2-III has a-NaFeO2-structure. Pressure treatment of CsInS2 yielded an unknown phase with a diffuse X-ray pattern.
Beiträge zur Chemie des Bors, LXXIII1 Über einige monomere und trimere Arsinoborane / Contributions to the Chemistry of Boron, LXXIII1 Some Monomeric and Trimeric Arsino Boranes
Authors: Goetze Richard , Nöth Heinrich
Published: March 2015

Monomeric and trimeric arsinoboranes have been obtained by three different methods. Bis(amino)arsinoboranes are monomeric, (C6H5)2BAs(CH3)2 is partially associated and decomposes readily, while (CH3)2BAs(CH3)2 proved to be trimeric as well as (CH3)2AsBBrCH3. Trimeric and tetrameric (CH3)2AsBH2 were isolated as the products of thermolysis of (CH3)4As2 · BH3. IR, MS and NMR data of the compounds are discussed.
Kooperative Jahn-Teller-Wechselwirkungen im HgCu(NCS)4 / Cooperative Jahn-Teller Coupling in HgCu(NCS)4 Crystals
Authors: Friebel Claus , Gonzalez Garmendia Maria J.
Published: March 2015

From EPR measurements on HgCu(NCS)4 crystals (space group D14
2h-Pbcn) a coupling of four differently orientated tetragonally elongated CuN4S2 octahedra with very long axial distances can be deduced. Two at a time of these polyhedra with differently orientated Cu-N axes are ferrodistortively ordered in layers 11(001). The Cu2+ ions of adjacent ferrodistortive layers are coupled in a disturbed type of antiferrodistortive order. The angle 2 γ = 113° between the CuN4 planes of the ferrodistortive layers, resulting from the spectroscopic data, is in approximative agreement with 2 γ = 119° found by X-ray structure determination. A strong exchange narrowing of the EPR line is observed in the (010) plane in an angle of β = ± 22° against the α-axis. From this exchange direction corresponding to the projection of one of the Cu-N axes on the (010) plane, conclusions can be drawn concerning the orientation of the magnetic dipoles connected with the spin moments of the coupled Cu2+ ions.
Aktivierte Thiocarbonsäureester, IV Acylierung CH-acider Thion- und Dithiocarbonsäureester / Activated Carboxylic Acid Thioesters, IV Acylation of CH-acidified Thione- and Dithiocarboxylates
Authors: Thimm Konrad , Voss Jürgen
Published: March 2015

Reaction of alkyl thione- (1) and dithiomalonates (2) as well as ethyl phenyldithioacetate (3) with acylchlorides, alkoxycarbonylchlorides, and alkylthiothiocarbonylchlorides yields vinyl thiolcarboxylates (4, 9), thiolcarbonates (5, 6, 10-12), and trithiocarbonates (7, 8, 13) by attack of the reagent at the thione sulphur atom of 1-3. 4-13 are obtained as mixtures of geometric isomers. An interpretation of the isomer ratio and the assignment of NMR lines and IR bands to particular isomers is attempted with regard to steric hindrance and electronic effects.
Dihydrochalcones and Chalcones of Some Flavanone Glycosides: Qualitativeand Quantitative Determinations
Authors: Linke Harald A. B. , Eveleigh Douglas E.
Published: March 2015

The chalcones and dihydrochalcones of the flavanone glycosides naringin, neohesperidin and hesperidin were separated and identified by thin-layer chromatography; a similar procedure was utilized to perform preparative TLC for purification of these compounds. A new spectrophotometric method for the quantitative determination of dihydrochalcones in the concentration range from 0.005 to 0.100% in aqueous or alcoholic solution is described as well as a detection method of these compounds in agar media for microbiological studies.
Isobenzpyrylium Salts, VI 13C NMR Investigation of 1-Arylnaphthalene Derivatives and Aza and Oxa Analogues
Authors: Vajda Miklos , Voelter Wolfgang
Published: March 2015

In previous communications1-4 substituent effects in the 1-arylisobenzpyrylium salt series were investigated. 13C NMR spectroscopy now made it possible to obtain quantitative data, which could be used for comparison of the electron distribution in 1-arylnaphthalene (1), 1-arylisobenzpyrylium salt (la), N-methylisoquinolinium salt (1b) and 1-arylisoquinoline (1c) derivatives. We hope that this set of data will be useful for the study of the differences in aromatic character in the various compounds and some insight into the interactions between the heterocyclic and the 1-aryl ring can also be obtained.
Notizen: 3-Chlorosulfonyl-6-methyl-2 H-1,3,5-oxadiazine-2,4(3 H)-dione
Authors: Sridhara Narendra S. , Latscha P.
Published: March 2015

Reaction of acetylisocyanate with chlorosulfonylisocyanate leads to 3-chlorosulfonyl 6-methyl-2 H-1,3,5-oxadiazine-2,4(3 H)-dione.
Notizen: 6,6′ -Bis-(2-pyridyl)-3,3′ -thiodipyridine
Authors: Pojer Peter M. , Summers Lindsay A.
Published: March 2015

6,6′-Bis-(2-pyridyl)-3,3′-thiodipyridine, the first example of a 3,3′-thiodipyridine, has been prepared by heating the sodium salt of 2,2′-bipyridyl-5-sulphonic acid at 500-600 °C.
Zur Kenntnis von MgAl2Te4, MgGa2Te4 und MgIn2Te4 / On the Ternary Tellurides MgAl2Te4, MgGa2Te4 and MgIn2Te4
Authors: Dotzel Peter , Franke Erich , Schäfer Herbert , Schön Günter
Published: March 2015

MgAl2Te4, MgGa2Te4 and MgIn2Te4 were prepared by direct synthesis from the elements at 1000°C. MgIn2Te4 crystallizes tetragonal in a variation of the zincblende structure. The vacancies are ordered as in β-Cu2HgJ4, the Mg- and In-atoms are distributed randomly in the cation sites of this structure.
Dithiolate und Dithiolato-Komplexe, I
Authors: Hackelberg Ortfried , Kramolowsky Reinhard
Published: March 2015

The complexes Bis(η-cyclopentadienyl)-1,1-dithiolatovanadium(IV) [VCp2(S2C=Y)] (Y = S,NCN,C(CN)2,C(CN) (CO2Et),C(CO2Et)2)* and Bis(η-cyclopentadienyl)-1,2-dicyanoethylene-1,2-dithiolatovanadium(IV) [VCp2(S2C2(CN)2)] are prepared by reaction of [VCp2Cl2] and the appropiate alkali metal salt K2S2C=Y or Na2S2C2(CN)2. The complexes are characterized by molecular weight, electric conductivity and magnetic measurements. The IR, electronic and ESR spectra are discussed.
Übergangsmetall-substituierte VB Elementsysteme, 7.
Authors: Malisch Wolfgang , Panster Peter
Published: March 2015

The reaction of SbBr3 with the complex metal carbonyl anions [π-C5H6(CO)3M]Na (M = Mo, W) leads to the formation of transition metal antimony bromides π-C5H5(CO)3M-Sb̅-Br2, which can be further metallated, yielding the stable species

[XXX]

All bromine substituted transition metal stibines prove to be excellent coordinating ligands and can easily be introduced into activated metal carbonyls. The interaction of π-C5H5(CO)3M-Sb̅Br2, with bromine results in a quantitative Sb-M bond cleavage, presumably via primary formation of pentavalent intermediates. All new compounds are fully characterized by means of IR, 1H NMR and mass spectroscopy.
Photochemische Reaktionen von Chlorden-Isomeren des Technischen Chlordans / Photochemical Reactions of Chlordene Isomers of Technical Chlordane
Authors: Gäb S. , Cochrane W. P. , Parlar H. , Korte F.
Published: March 2015

The photochemical behaviour of α-, β- and γ-chlordene in solution was examined. UV-irradiation in methanol showed that direct excitation leads to [2 π + 2 π]-photocycloaddition and photodechlorination reactions. The proposed structures of the photoproducts are supported by spectroscopic data (MS, IR, PMR). The insecticidal properties of several products of photoisomerisation and photodechlorination reactions were measured and compared with those of the original compounds.
Notizen: Aktivierte Thiocarbonsäureester, II / Activated Carboxylic Acid Thioesters, II
Authors: Thimm Konrad , Voss Jürgen
Published: March 2015

Reaction of dialkyl monothionooxalate with ortho-phenylenediamine yields 3-alkoxy-2-oxo-quinoxaline, whereas benzothiazole-2-carboxylic acid ethyl ester 8 is obtained from o-aminothiophenole.
Notizen: Darstellung und Isolierung von Stickstofftribromid NBr3 und Stickstoffdibromidmonojodid NBr2J / Preparation and Isolation of Nitrogentribromide NBr3 and Nitrogendibromidemonoiodide NBr2I
Authors: Jander Jochen , Knackmuss Jürgen , Thiedemann Klaus-Ulrich
Published: March 2015

Nitrogen tribromide was prepared andisolated in a pure state. Its analysis and molecular spectra are reported briefly. Reactions with ammonia, tertiary organic Nbases, and iodine give monobromamine, molecular addition compounds between Nbaseand bromine, and nitrogendibromidemonoiodide,respectively.
Zur Kenntnis organischer Lewissäuren, 31 / On Organic Lewis Acids, 31
Authors: Bednar Renate , Polansky Oskar E. , Wolschann Peter
Published: March 2015

Arylidenbarbituric acids (4) and arylidendimethylbarbituric acids (5) are compounds with a polarized C = C-double bond, and hence are electrically neutral lewis acids. Therefore they are able to add bases. The measured UV spectra show a characteristic dependence on the pH value. pK values are reported.
Facile Synthesis of the Chalcones and Dihydrochalcones from Naringin, Neohesperidin and Hesperidin
Authors: Linke H. A. B. , Eveleigh D. E.
Published: March 2015

The flavanone glycosides naringin, neohesperidin and hesperidin were converted chemically to the corresponding chalcones and dihydrochalcones; the one-step synthesis, performed at room temperature, required the presence of 25% KOH in the reaction mixture for the former and 10% KOH, a catalyst and molecular hydrogen at atmospheric pressure for the latter.
Notizen: Über eine einfache Darstellung und einige Eigenschaften von Bis(mercaptomethyl)sulfid / A Simple Synthesis and Some Properties of Bis(mercaptomethyl)sulfide
Authors: Schmidt Max , Endres Lothar
Published: March 2015

Bis(mercaptomethyl)sulfide is synthesized from 1,3,5-trithiohexane and dichlorodisulfane via Bis(chloromethyl)sulfide and polymeric bisthiomethylsulfide by cleavage of the latter in liquid ammonia by sodium.
Notizen: Molekülstruktur von Bis[tris(diäthylamido)-titano] -ferrocen / Molecular Structure of Bis[tris(diethylamido)-titano]-ferrocene
Authors: Thewalt Ulf , Schomburg Dietmar
Published: March 2015

The results of an X-ray structure analysis of the title compound prove the molecular structure proposed earlier to be correct. Mean values of bond lengths are Fe-C(π): 2.06, Ti-C(σ): 2.15, and Ti-N: 1.89 A.
Zur Darstellung und Kristallstruktur von AgCrO2 / Synthesis and Crystal Structure of AgCrO2
Authors: Gehle Egbert , Sabrowsky Horst
Published: March 2015

A novel preparation is reported for AgCrO2 from elemental silver and Cr2O3 in the presence of thallium oxide. A refinement of the structure was undertaken by the use of diffractometric single-crystal data. The newly determined lattice parameters of the compounds (Delafossite-type), which crystallizes in the space group R 3 m, are : α = 2.985 Å, c = 18.51 Å; c/a = 6.20; number of formula units Z = 3 (dexp = 6.63; drö = 6.69 gcm-3). For the oxygen particles in the point position 6c z (O) = 0.1119.
A Study of the Kinetics of the Basic Zinc Carbonate Formation Reaction
Authors: O'Connor M. F.
Published: March 2015

A study of the kinetic parameters involved in the formation of basic zinc carbonate by the action of carbon dioxide and water vapour on zinc oxide has been undertaken. A contracting sphere model is used to explain the reaction but its applicability is dependent upon the carbon dioxide pressure used. Water vapour pressures close to saturated water vapour pressure are necessary for the reaction to proceed and the role of the necessary near-liquid surface water layer in the absorption reaction is discussed.
13C-NMR-Spektroskopie an polycyclischen Aromaten, IIΙ Die 13C-NMR-Spektren von Amino- und Dimethylaminonaphthalinen /13C NMR Spectroscopy of Polycyclic Aromatics, III The 13C NMR Spectra of Amino- and Dimethylaminonaphthalenes
Authors: Ernst Ludger
Published: March 2015

The 13C NMR spectra of twelve amino-, dimethylamino-, diamino-, and bis(dimethylamino)naphthalenes are completely assigned by selective 13C{1H} double resonance and by interpretation of proton-coupled spectra. Strong substituent effects (Δδ) upon chemical shifts are observed and can largely be accounted for by mesomerism. The pronounced high-field shifts of C-6 in the 2-amino- and 2-dimethylaminonaphthalenes coincide with the enhanced reactivity of this position towards electrophilic reagents. In 1-dimethylaminonaphthalene and even more so in 1-dimethylamino-2-methylnaphthalene, conjugation is inhibited for steric reasons and Δδ’s are greatly diminished, thus giving an estimate for the contribution of resonance to substituent-induced shifts in the unhindered compounds. In two 1,8-disubstituted naphthalenes there are large deviations from additivity of substituent effects.
Notizen: Ternäre Kaliumphasen mit modifizierter K8Ge46-Struktur / Ternary Potassium Phases with a Modified K8Ge46 Structure
Authors: Schuster Hans-Uwe , Westerhaus Wolfgang
Published: March 2015

Ternary phases of potassium with gallium resp. indium and germanium resp. tin have been prepared and investigated by X-ray diffraction. The results of the powder patterns show that the phases crystallize in a modified K8Ge46-type structure.
Notizen: Ternäre Phasen des Natriums mit den Elementen Gold und Germanium bzw. Zinn / Ternary Phases of Sodium with Gold and Germanium Resp. Tin
Authors: Wrobel Georg , Schuster Hans-Uwe
Published: March 2015

The ternary systems Na-Au-Ge and Na-Au-Sn have been investigated and two new phases with the formula Na2AuGe and NaAuSn were observed. They crystallize in the orthorhombic system. The crystal data have been determined.
Polarographic Study of the Streaming Maximum of Nitrobenzene in Mcilvaine Buffer
Authors: Lal Sudarshan
Published: March 2015

The polarographic maximum of nitrobenzene (first reduction step) is studied at pH 2.2, 5.3 and 7.8. The nature of the maximum is pH dependent and it changes from positive first kind (at pH = 2.2) to negative maximum of the first kind (at pH 5.3, 7.8). At higher flow-rates, compound maxima occur and clear reversal potentials are located where maximum of first kind is transformed into the second kind and vice versa. The morphology of current-time curves has been examined critically in the light of streaming patterns, electrode circuitry, flow-rates and exponents of t at varying intervals during the drop life
Spektroskopische Untersuchungen in der Festkörperchemie, X Re–NQR-Untersuchungen an TlReO4 und LiReO4 · 2 H2O / Spectroscopic Investigations in the Solid State Chemistry, X Re-NQR Investigations on TlReO4 and LiReO4 · 2 H2O
Authors: Burkert Paul K. , M. Hutter Frank
Published: March 2015

The 187Re–NQR transitions of TlReO4 and their temperature dependencies were measured. In the temperature range, in which TlReO4 is crystallizing in pseudo scheelite structure, one obtains normal temperature coefficients with asymmetry parameters η = 0.3. For Τ < 200 Κ, however, another modification with η = 0 was found.

For LiReO4 • 2 H2O complex 187Re and 185Re NQR spectra with 16 transition frequencies were measured and discussed.
Untersuchungen in der Thiazolreihe, V. Thiazolo-[3.2-a]-pyrimidone aus 2-Aminothiazol-3-Oxiden und Acetylendicarbonsäureestern / Investigations on Thiazoles, V. Thiazolo-[3,2-a]-pyrimidones from 2-Aminothiazole-3-oxides and Esters of Acetylenedicarboxylic Acid
Authors: Entenmann Günther
Published: March 2015

2-Aminothiazole-3-oxides react with esters of acetylenedicarboxylic acid to give fluorescent thiazolo-[3,2-a]-pyrimidones. In some cases intermediate rearrangement products can be isolated.
Synthetic Studies towards Vinblastine and its Analogues, VI The Markownikov Addition of Acetic Acid to Catharanthine by a Modification of the Prevost Reaction
Authors: Rahman Atta-Ur , Waheed Nighat , Ghazala Maryam
Published: March 2015

The reaction of catharanthine under modified prevost reaction conditions has afforded 20-acetoxydihydrocatharanthine, an important intermediate for the synthesis of antileukaemic alkaloids, vinblastine and vincristine.
Notizen: Substitution of CO for CN— in Cyclopentadienyl Carbonyl Vanadium Compounds
Authors: Rehder Dieter
Published: March 2015

UV irradiation of [Me4N][VCp(CO)3] and [Me4N]CN results in the formation of a complex with zero-valent vanadium which possibly has to be formulated as

[Me4N]4[CpV(CO)2CN]2. A new method of preparation of K[CpV(CO)3CN] is described; 51V NMR results and a complete IR spectrum are presented and discussed.
Notizen: Quenchable High Pressure Phases of DyYbS3
Authors: Clark J. B. , Range Klaus-Jürgen
Published: March 2015

Two quenchable high pressure modifications of Dy YbS3 are isotypic with U2S3 and Ce2S3 (Defect-Th3P4 type).
Notizen: Electrical Conduction in Thiantrene
Authors: Pietra S. , Finetti M.
Published: March 2015

Electrical conductivity of thiantrene monocrystals was observed. The experimental results were interpreted as a “hopping” mechanism between the molecules of crystal.
Contributions to the Chemistry of Boron, LXXV The Crystal and Molecular Structure of a Tetraazadiborine: 3,6-Bis(dimethylamino)-1,2,4,5-tetramethyl-1,2,4,5,3,6-tetraazadiborine
Authors: Huffman J. C. , Fusstetter H. , Nöth H.
Published: March 2015

The title compound crystallizes in the monoclinic system with dimensions of the unit cell a = 14.09(2), b = 8.60(1), c = 11.34(1) Å and β = 101.7°. The space group was determined to be A 2/a with four molecules in the unit cell. The structure was solved by direct methods, and all hydrogen atoms were located. Full matrix refinement led to R = 0.059. The B2N4 six membered ring is nonplanar as expected for an 8π electron heterocycle. The molecule possesses C2 symmetry but the ring itself is near the D2 symmetry as derived from earlier CNDO/S-calculations. The BN bond lengths are 1.43 A, the NN distances 1.43 Å and the average CN distances 1.44 A. The boron atoms and four of the six nitrogen atoms are trigonal-planarly coordinated while the remaining two N-atoms (N1,N2) deviate little, but significantly, from sp2 hybridisation. The structure of the molecule can be interpreted as the best compromise between ΒΝ-π-bonding, nonbonding repulsion between adjacent CH3 groups, and the interaction between neighbouring ‘free pairs of electrons’ of the ring N-N-units.
System-theoretical Investigation of Possible Hysteresis Effects in the Hydroformylation Process
Authors: Seelig Friedrich Franz
Published: March 2015

The complicated and partially controversial formulations of the various steps and branchings in the hydroformylation process are comprised in a reaction scheme that neglects the production of different isomers and isomerisations of olefins and is a compromise between the given complexity and a theoretical tractability. Special consideration is devoted to the inhibition of the process by one of its substrates, CO. In a first approximation complete inertness of the Co-tetracarbonyls is assumed and the existence of bistability and hysteresis for particular parameter combinations is proved. In the further treatment this approximation is again relaxed. Technological consequences of the analysis are discussed.
Markierte Verbindungen, XXV Chloraustausch zwischen 1.2.3.3-Tetrachlor-1-propen und Antimon(III)-chlorid — das 1.2.3-Trichlorpropenylium-Ion.
Authors: Boberg Friedrich , Voss Rainer
Published: March 2015

The exchange of chlorine between 1,2,3,3-tetrachloro-1-propene (1) and SbCl3 occurs only on C-1 and C-3 of 1. A law of 1. order discribes the exchange. A mechanism with the 1,2,3-trichloropropenylium ion (10) is in accordance with these facts. Investigations on cis/trans isomerization of 1 in systems with AlCl3 and SbCl3 and 1H NMR studies give informations about the concentrations of 10.
Mesoionische Sechsringheterocyclen, VI. Umlagerungen von Heterocyclen, IV. Zur thermischen Umlagerung von N-Benzyl-pyrimidinmesoionen./ Mesoionic Sixmembered Heterocycles, VI. Rearrangement Reactions of Heterocycles, IV. Thermal Rearrangement of Mesoionic N-Benzyl-pyrimidines
Authors: Schindler Gerda , Furtunopulos Demetrius , Kappe Thomas
Published: March 2015

N → O Benzyl group migration upon pyrolysis of the zwitterionic pyrido-pyrimidine (4) leads to the uncharged O-ether (3) in poor yield. On the other hand, heating of the monocyclic mesoionic pyrimidine (12) gives a radicalic N →C migration of the benzyl group yielding the 5,5-dibenzyl-4,6-dioxo-pyrimidine (14).
Synthesis of New Heterocycles by Halogenation of Tetrasulfur Tetranitride S4N4
Authors: Monteil Y. , Vincent H.
Published: March 2015

Bromine reacts with tetrasulfur tetranitride S4N4 in solution in different solvents to give thiodithiazyl dibromide S3N2Br2.

Iodine reacts under the same conditions with S4N4 to give trithiazyl iodide (SN)3I.

The addition of chlorine, bromine or iodine to a mixture of tetrasulfur tetranitride and white phosphorus leads to compounds with the general formula P2S3N3Xn, with n = 1 or 3 depending on the nature of X.
Bonding in Cyclophosphazenes: Quantum and Experimental Support for DEWAR′s Island Model
Authors: Faucher J.-P. , Labarre J.-F. , Shaw R. A.
Published: March 2015

Quantum mechanical calculations for a number of cyclophosphazenes reveal that transannular bonding and antibonding interactions contribute considerably to the stability and conformation of these PN ring systems. Charge distributions are only in agreement with the island theory; the latter is confirmed by Faraday effect measurements.
Preparation and Reactions of Sulfur-Nitrogen Ring Systems
Authors: Roesky Herbert W.
Published: March 2015

Two routes for the preparation of (CH3)2SnS2N2 are given, which are kinetically controlled reactions. The molecule (CH3)2SnS2N2 was characterized by X-ray analysis. It is an interesting starting material for the preparation of S2N2CO and S3N2O. The latter reacts with iminosulfur oxides and isocyanates under the formation of S3N3SO2F and S3N3SO2CF3. The structure of S3N3SO2F was established by X-ray analysis. The bonding properties are discussed.

The cleavage of thin-nitrogen derivatives with S3N2Cl2 yields also five membered sulfurnitrogen rings. The structure and properties of P3N3F5NS3N2 and C3N3F2NS3N2 are reported. Six, eight and ten membered rings are formed by the reactions of

(CH3)3Si–N = S = N–Si (CH3)3

with FSO2–N=S=O, these are S4N4O2 and S5N5+S3N3O4, respectively. The cation S5N5+ is a planar molecule, while the oxygen containing species are puckered. In S4N4O2 the oxygens are attached to one sulfur atom, which has a tetrahedral configuration.

The structure of the silicon containing cyclic and bicyclic rings (CH3)2Si(NSN)2Si(CH3)2 and CH3Si(NSN)3SiCH3 were determined.
Notizen: LiPbMIIIF6-Verbindungen sowie die Verbindungen Pb3(AlF6)2 und Pb3(TiF6)2 / LiPbMIIIF6-Compounds and Pb3(AlF6)2 and Pb3(TiF6)2
Authors: Gaile Jürgen , Rüdorff Walter
Published: March 2015

Fluorides LiPbMIIIF6 with MIII = V, Cr, Fe and Ga were prepared. They crystallise hexagonally (ordered superstructure Li2ZrF6). With MIII = Al and Ti the compounds Pb3(AlF6)2 and Pb3(TiF6)2 are obtained.
13C NMR-spektroskopische Untersuchungen an Äthylaluminiumverbindungen / 13C NMR Spectroscopic Investigations of Ethylaluminium Compounds
Authors: Rottler R. , Kreiter C. G. , Fink G.
Published: March 2015

The 13C NMR spectra of the ethylaluminium compounds [Al(C2H5)xCl3_x]2 x = 1, 1,5, 2 and 3 are presented and factors governing the temperature dependence of the line shape are discussed. The exchange reaction of terminal ethyl groups for chlorine ligands and ethyl ligands, resp., in ethylaluminium-sesquichloride was investigated by fitting the calculated line shapes to the observed spectra.

The energy of activation of this exchange process was determined as to be 12,3 ‡ 1,5 kcal/mole. The synthesis of 13C2-[Al(C2H5)Cl2]2 is described.
Oberflächenverbindungen von Übergangsmetallen, XVI Chemilumineszenz bei der Oxydation koordinativ ungesättigter Oberflächenverbindungen / Surface Compounds of Transition Metals, XVI Chemiluminescence Phenomena in the Oxydation of Coordinatively Unsaturated Surface Compounds
Authors: Morys Peter , Gerritzen Roger , Krauss Hans-Ludwig
Published: March 2015

The reduced, coordinatively unsaturated surface compounds of chromium, vanadium and molybdenum, supported on silicagel, react with O2 under chemiluminescence; the extremely broad emission bands have their maxima at v = 15,0 kK (chromium), 18,6 kK (vanadium) and 20,6 kK (molybdenum).

A general reaction mechanism is proposed based on the electronic structures of the starting, intermediate and final products. It allows an interpretation of the observed chemiluminescence phenomena in agreement with other experimental data; the desactivation of a CT excited peroxo complex of do metal ion is postulated as source of radiation.
Bis (dimethylsulfoxoniummethylid)-tetracarbonyl-Komplexe der Metalle Chrom, Molybdän und Wolfram / Bis(dimethylsulfoxoniummethylid)tetracarbonyl Complexes of Chromium, Molybdenum and Tungsten
Authors: Weber Lothar
Published: March 2015

From the photochemical reaction of M(CO)6 (M = Cr, Mo, W) and (CH3)2

-CH2 in ether,

yellow solids with the composition [(CH3)2

-CH2]2M(CO)4 are obtained in good yields.

[(CH3)2

-CH2]2M(CO)4 (M = Cr, Mo) are also accessible by the displacement of olefin from

(norbornadiene) M(CO)4 by excess ylid in ether. Pale insoluble [(CH3)2

-CH2]3Mo(CO)3 is

the sole product from the reaction of (cycloheptatriene)Mo(CO)3 and excess ylid in ether.
Synthese, in vivo- und in vitro-Untersuchungen zur tumorhemmenden Wirkung von cis-Dichloro-dipeptidester-platin(II)-Komplexen / Synthesis, in vivo and in vitro Studies on the Antineoplastic Effect of cis-Dichloro-dipeptide Ester Platinum(II) Complexes
Authors: Beck Wolfgang , Purucker Bernhard , Girnth Michael , Schönenberger Helmut , Seidenberger Horst , Ruckdeschel Gotthard
Published: March 2015

cis-Dichlorodipeptide esterplatinum complexesCl2Pt(MetGlyOEt),Cl2Pt(EthionylGlyOEt), Cl2Pt(GlyGlyOEt)2 and Cl2Pt(GlySerOEt)2 are prepared from the α-amino acid complexes by peptide synthesis using platinum as an amino protecting group. cis-Cl2Pt(GlyGlyOEt)2 and cis-Cl2Pt(GlySerOEt)2 have been prepared also directly from K2PtCl4 and the dipeptidesters. cis-Cl2Pt(GlyGlyOEt)2 (2 a) and cis-Cl2Pt(NH3)2 (5) lead to a prefered inhibition of the DNA-synthesis of sarcoma 180, Yoshida-sarcoma and Walker-256-carcinosarcoma in vitro; RNA- and protein biosynthesis are influenced to a much lower degree. 2a and 5 cause filamentous growth in Escherichia coli B. The DNA polymerase deficient strain of E. coli, p 3478 pol A-, is more inhibited by 2 a and 5 than the non deficient strain W 3110 pol A+. Tumor growth of di-2-chloro-ethylmethylamine (HN2) resistant sarcoma 180 and of Yoshida sarcoma is weakly inhibited, whereas Walker-256-carcinosarcoma is markedly inhibited; however 2a and 5 show similar inhibition of the same tumor.
Synthesis of Ethyl α-Phenylthiocarbamylglyoxalate Arylhydrazones and their Reactions with Hydrazines
Authors: Harhash Abdel Hamid , Amer Fathy Abdel Kader , Eldin Mahmoud Abdel Fattah Nour , Awad Mary Labib
Published: March 2015

Treatment of ethyl α-phenylthiocarbamylacetoacetate (1) with aromatic diazonium salts effects acetyl cleavage with the formation of ethyl α-phenylthiocarbamylglyoxalate arylhydrazones derivatives (2 a-e) which afford the anilinopyrazolones (5) and (7) on treatment with hydrazine or phenylhydrazine. The pyrazolones 5 a-e undergo aminoalkylation with formaldehyde and piperidine to give the N-Mannich bases 7 a-e, also obtained by treating the N-hydroxymethyl derivatives (9 a-e) with piperidine.
Reactions with 1-Phenyl-4-thiohydantoin. Preparation of 5-Arylazo-1-phenyl-4-thiohydantoin, their Reactions towards Alkylating Agents and Mannich Reaction
Authors: Shalaby A. F. A. , Daboun H. A. , Boghdadi S. S. M.
Published: March 2015

1-Phenyl-4-thiohydantoin reacted with aryldiazonium salts to give the corresponding

5-arylazo-1-phenyl-4-thiohydantoin (1 a-f). On alkylation of 1 a, b,f with different alkyl halides, the corresponding 4-alkylmercapto derivatives (2a-f) were obtained. 2 a was hydrolysed with a mixture of ethanol-hydrochloric acid to give 5-phenylazo-1-phenyl-hydantoin (3). Treatment of 2 a, d with amines gave the products 4a—h. 4 a when refluxed with a mixture of acetic-hydrochloric acid, the product 3 was obtained, 1a, b reacted with formaldehyde and appropriate amine to give the corresponding Mannich bases 5 a-k. Also 1-phenyl-4-thiohydantoin when exposed to the Mannich reaction, 6a-e were obtained, 6 a when treated with benzenediazonium chloride, the colour substance 5 a was separated.
Notizen: Notiz zur Kristallstruktur von APb2Cl5-Verbindungen / Notice about Crystal Structures of APb2Cl5-Compounds
Authors: Keller. H.-L.
Published: March 2015

Single crystals of TlPb2Cl5 and NH4Pb2Cl5 were prepared. X-ray diffraction data confirm the space group C2h
5—P21/c (No. 14). Crystal structure determination shows a new typ, belonging to the PbCl2-structure.
Kondensationsreaktionen von silylierten Sulfamiden mit Trithiadiazyldichlorid.
Authors: Montenarh Mathias , Appel Rolf
Published: March 2015

N-Diorgano-N′-bis(trimethylsilyl)sulfamide (1 a, b) and Ν,Ν,N′,N′-tetrakis (trimethylsilyl)sulfamide (4) react with trithiadiazyl dichloride (2) to give the trithiazolidenes (3 a, b) and (5).
System-theoretical Investigation of Possible Oscillatory States in the Hydroformylation Process in an Open Isothermal System
Authors: Seelig Friedrich Franz
Published: March 2015

The kinetic model for the hydroformylation process as given in a previous paper (SEELIG1) is extended in as far as the concentrations of all three substrates (olefin, H2, CO) are allowed to move freely, whilst in the first investigation this was the case only for CO, the concentrations of olefin and H2 being kept constant. So the derived hysteresis loop of [CO] va influx of CO is shifted back and forth by the varying [olefin] and [H2], causing oscillations for particular combinations of the parameters. These oscillations are due to the substrate inhibition by CO and are not the result of instabilities of some external control circuit; so they would occur even in a perfectly isothermal open system.
The Reaction of β-Cyanoethylhydrazine with Diethyl Phenylthiocarbamoylmalonate
Authors: Mohamed Sallam Mohamed Mohamed , Elnagdi Mohamed Helmy , Fleita Daizy Hanna , Hartmann Eric
Published: March 2015

Diethyl phenylthiocarbamoylmalonate (2) reacts with β-cyanoethylhydrazin (1) to yield ethyl 3-anilino-2-pyrazolin-5-one (3) via decyanoethylation of the reaction intermediates.

Whereas 2 reacts with hydrazine hydrate in refluxing ethanol to yield a mixture of 3-anilino-2-pyrazolin-5-one (4) and the hydrazide (5), the diethyl ester (6) is formed on treatment of 2 with the same reagent in a cooled ethanolic solution. On the other hand, 2 reacts with hydrazine hydrate in the absence of a solvent to yield the carboxylic acid (7).

Benzoylacetonitrile reacts with phenylisothiocyanate to yield the thioanilide (8). The latter compound neither reacts with hydrazine hydrate not β-cyanoethylhydrazine.
Notizen: Zur elektronenstoßinduzierten Isomerisierung und Fragmentierung von Butencarbonsäuremethylestern.
Authors: Herrmann Rupert , Schwarz Helmut
Published: March 2015

On the contrary to the photochemical behavior the title compounds do not isomerise to a common intermediate prior to or during electron impact induced fragmentation. The unusual methyl elimination from the trans(2)-butenoic acid methyl ester probably is accompanied by a concerted [1.3] methoxy rearrangement from the ester function on to the β carbon atom.
Notizen: Zur Verbindungsbildung von MeO: M2O3, II Über SrCa2Yb10O18 und SrCa2Lu10O18.
Authors: Muschick M. , Müller-Buschbaum Hk.
Published: March 2015

The hitherto unknown compounds SrCa2Yb10O18 (1) and SrCa2Lu10O18 (2) were prepared and examined by X-ray single crystal structure (Space group C6⁻
6 P63, a = 1745.2; c = 333.0 pm (1), a = 1740.4; c = 330.7 pm (2)). 1 and 2 are isostructural with SrCaSc6O12, but there is a statistical distribution of Yb3+ and Ca2+ or Lu3+ and Ca2+, respectively. It explains the same structure but the differences between the formulas of 1, 2 and SrCa2Sc6O12.
Notizen: 13C-Hochauflösungs-NMR substituierter Ferrocene.
Authors: Köhler Frank H.
Published: March 2015

The 13C high resolution NMR spectra of five alkylated ferrocenes have been recorded and analysed. The different nJ(CH) were determined and used for a generally applicable assignment of five-ring carbon resonances.
Notizen: Einfache, schonende Synthese von Aminosäuremethyl- und benzylestern.
Authors: Weber U.
Published: March 2015

Methyl- and benzylesters of acid labile amino acids are obtained as their hydrochlorides or BF3-complexes by reaction of the N-protected amino acid with benzylalcohol (methanol), DCC, HOBt and pyridine and subsequent cleavage of the N-protection group by HCl in acetic acid or bortrifluorideetherate in acetic acid.
Anionenaktivierung, III. Zur Bedeutung von Wasserstoffbrückenbindungen für das reaktive Verhalten von Kronenäthern und Aminopolyäthern / Anionactivation, III. Anionactivation, III1 Concerning the Significance of Hydrogen-Bonding for the Reactivity of Crown Ethers and Aminopolyethers
Authors: El Basyony A. , Klimes J. , Knöchel A. , Oehler J. , Rudolph G.
Published: March 2015

Adducts of macrocyclic polyethers (crown ethers) and aminopolyethers1,2 having hydrogen bonds with polar organic molecules, especially with CH-acidic compounds, are described. These can be isolated as solids, and are, as a rule, stoichiometrically consistent. The chemical shift of the 1H NMR signals of the adducts of malononitrile with various crown ethers corresponds to the anionic reactivity of potassium complexes of the crown ethers in the course of nucleophilic substitution reactions.
Gehinderte Ligandenbewegungen in Übergangsmetallkomplexen, X1 Carbonyl-donorligand-η-1.3.5-cycloheptatrien-chrom(0)-Komplexe / Hindered Ligand Motions in Transition Metal Complexes, X1 Carbonyl-donorligand-η-1,3,5-cycloheptatriene-chromium(0) Complexes
Authors: Djazayeri Mahmud , Kreiter Cornelius G. , Kurz Hans M. , Lang Mehrfar , Özkar Saim
Published: March 2015

Tricarbonyl-η-1,3,5-cycloheptatriene-chromium(0) (1) reacts photochemically with trimethyl-phosphine, -arsine, or -phosphite respectively to form the complexes CrC7H8(CO)2L (2-4) (L = P(CH3)3, As(CH3)3, P(OCH3)3) and CrC7H8(CO)[P(OCH3)3]2 (5) The 1H, 13C and 31P NMR spectra of these complexes are temperature dependent as a result of a hindered motion of the C7H8 ligand. By this motion the dissimilar stereoisomers of the complexes, which are present, partly in very different concentrations, are interconverted. The energy barriers of the isomerisations were determined.
Kernresonanzspektroskopische Untersuchungen an Vinyl-p-anisyl-dithiophosphinsäure-trimethylsilylester.
Authors: Hägele Gerhard , Kuchen Wilhelm , Keck Helmut
Published: March 2015

The 100 MHz 1H NMR spectrum of vinyl-p-anisyl-dithiophosphinic acid trimethylsilylester is analyzed by iterative methods. Data for ABCX and [AB]2X spinsystems are reported.
Reaktionen von Metallcarbonylverbindungen mit Diaziridin.
Authors: Danzer Wolfgang , Beck Wolfgang , Keubler Michael
Published: March 2015

Cyclic carbamoyl complexes (2) and (3) result from the reaction of metal carbonyl hydrides with 3,3-pentamethylen diaziridine (1). 1 is cleaved at the metal by reaction with substituted metal carbonyls of Mo and W formally into ‘nitrene’ and cyclohexanone imine, which are isolated as isocyanate and ketimine complexes, respectively. 1 forms adducts with cobalt and nickel(II) chlorides.
Sauerstoffanaloge Δ8- und Δ9-Tetrahydrocannabinole.
Authors: Kraatz Udo , Korte Friedhelm
Published: March 2015

The phloroglucine derivatives (2 a–h) react with (+)-trans-p-menthadien-(2,8)-ol-(1) to give the oxygen analogous of (—)-Δ8-tetrahydrocannabinole such as 3 a–h. Some of these derivatives were converted by HCl-addition/elimination into the isomeric Δ9-compounds. The proposed structures of the derivatives are supported by spectroscopic data (1H NMR, IR and MS).
Notizen: Darstellung und Kristallstruktur des Ba2Si.
Authors: Widera Axel , Schäfer Herbert
Published: March 2015

Single crystals of Ba2Si have been prepared. From a complete X-ray structure determination follows the anti-PbCl2 structure type.
Contributions to the Chemistry of Boron, LXXXII. The Crystal and Molecular Structure of B,B′ -bis(1,3-dimethyl-1,3,2-diazaborolidin-2-yl)
Authors: Fusstetter H. , Huffman J. C. , Nöth H. , Schaeffer R.
Published: March 2015

The title compound 2 crystallizes monoclinic, and the space group was determined to be C 2/c. The unit cell contains 16 molecules grouped in two sets of crystallographic independent molecules. The structure was solved by direct methods. Full matrix refinement led to R = 0.09. The molecules have C2 symmetry. The compound is composed of two five membered diazaborolidine rings joined by a boron-boron bond. The two nearly planar rings are twisted to one another by 61.6° and 56.8° respectively
Umsetzung von Diazadiphosphetidinen mit LEWIS-Säuren. / Reaction of Diazadiphosphetidines with LEWIS Acids
Authors: Scherer Otto J. , Schnabl Günter
Published: March 2015

The reduction of SnCl4, PCl5 and SbCl5 by diazadiphosphetidines with formation of diazaphosphoniumphosphetidines and the anions SnCl3
-, Cl- and SbCl4
- is described. With SnCl4 a 1:1 adduct has been isolated as the primary product
Nuclear Quadrupole Resonance of Nitrogen-14 in Potassium Hexathiocyanatoplatinate(IV) and Tetrathiocyanatomercurate(II)
Authors: Asaji Tetsuo , Ikeda Ryuichi , Nakamura Daiyu
Published: March 2015

The nuclear quadrupole resonance of 14N was observed in K2Pt(SCN)6 and K2Hg(SCN)4 at various temperatures. Both compounds yield large asymmetry parameters indicating the existence of asymmetric π-electron distribution about a CN bond axis. The ionic character of metal-ligand bonds in the platinum and mercury complexes is estimated to be 28% and 58%, respectively. The temperature dependence of each component of quadrupole coupling can practically be interpreted in terms of a simple Bayer theory. Both complexes show the quadrupole coupling constant versus temperature curve faintly convex to the abscissa. This anomaly is attributable to vibronic interaction in a thiocyanate group
Übergangsmetall-bis(fluorsulfonylamide). / Transition Metal-bis(fluorosulfonyl) Amides
Authors: Froböse R. , Mews R. , Glemser O.
Published: March 2015

AgN(SO2F)2 reacts with a variety of transition metal carbonyl and nitrosyl halides with exchange of N(SO2F)2 versus halogen leading to stable bis(fluorosulfonyl)amido complexes (3-8). Triphenylphosphine replaces the weakly σ-donating (FSO2)2N ligand with formation of cationic triphenyl phosphine transition metal complexes, e. g. (CO)5MnN(SO2F)2 + PPh3 → [(CO)5MnPPh3]N(SO2F)2
Elektrochemische Synthesen, X Kernsubstitution von Alkylaromaten / Electrochemical Syntheses, Χ Nuclear Substitution of Alkylarenes
Authors: Fritz Heinz P. , Kremer Hans-Joachim
Published: March 2015

The electrochemical synthesis of phenols of alkylated arenes is described with special consideration of added metal salt redox pairs.
Antiferromagnetische Wechselwirkungen in einigen µ-Oxoeisen(III)-Porphyrinen / Antiferromagnetic Interactions in Some µ-Oxoiron(III)-porphyrins
Authors: Lueken Heiko , Buchler Johann W. , Lam Lay K.
Published: March 2015

The magnetic susceptibilities of the binuclear oxobridged iron(III)-porphyrins [Fe(TTP)]2O (2 d), [Fe(OÄP)]2O (3 b) and [Fe(OÄPMe2)]2O (4b) have been determined over the temperature range 4-300 K. The measured susceptibilities of [Sc(TTP)]2O (2 e) and [Sc(OÄP)]2O (3 c) were used as diamagnetic corrections for [Fe(TTP)]2O (2 d) and [Fe(OÄP)]2O (3 c), respectively, whereas the diamagnetic correction for [Fe(OÄPMe2)]2O (4b) was calculated from the measured values of H2(OÄP) (3d), H2(OÄPMe2) (4c) and [Sc(OÄP)]2O (3 c). Antiferromagnetic interactions between the Femions can be described in terms of the HEISENBERG—DIRAC—VAN VLECK-model. The relation between exchange coupling parameters J12 and steric and electronic effects of the substituents is discussed. The anomalous magnetic behaviour of [Fe(OÄP)]2O (3 b) between 230 and 250 K is due to a change in crystal structure.
Photoelektronen-Spektren und Moleküleigenschaften, LXIII Ionisierungsenergien von Phenyl-Methyl-Tellurid und Vergleich der Effekte von Sauerstoff-, Schwefel-, Selen- und Tellur-Substituenten auf das Benzol-π-System / Photoelectron Spectra and Molecular Properties, LXIII Ionization Energies of Phenyl Methyl Telluride and Comparison of Effects of Oxygen, Sulphur, Selenium and Tellurium Substituents on the Benzene π System
Authors: Tschmutowa Galina , Bock Hans
Published: March 2015

The photoelectron spectrum of H5C6-Te-CH3 displays in its low energy region overlapping bands of gas-phase conformers. Depending on the dihedral angle between the plane of the phenyl ring and the tellurium lone pair, the π conjugation amounts to only 0.1 eV and 0.3 eV, respectively. These values are compared to the considerably larger ones found for the analogous phenyl derivatives H5C6-X-CH3 with X = O, S and Se.
Ein neues Verfahren zur spektrometrischen Analyse von Metallkomplex-Lösungen / A New Method for Spectrometric Analysis of Complex Metal Solutions
Authors: Polster Jürgen
Published: March 2015

A new simple method is given to analyse potentiometrically titrated and spectrophotometrically measured complex-solutions of the system AH ⇌ A + H3O+ and n • A + M ⇌ MAn. The absorbance coefficients of the metal complex MAn and the stability constants can be determined for each titration step by construction of the “extinction triangle” in the (two-dimensional) absorbance (E) diagram. It is not necessary to know the absolute pH value of the solution. The titration of 2-nitroso-1-naphthol-4-sulfonic acid/zinc sulfate in water is shown as an example.
Ringspaltung von 2.5-Diphenyl-tellurophen mit n-Butyl-Lithium Synthese von 1.4-substituierten Butadienderivaten / Ring-opening of 2,5-Diphenyl-tellurophene with n-Butyl-Lithium Synthesis of 1,4-substituted Butadiene Derivatives
Authors: Luppold Ernst , Müller Eugen , Winter Werner
Published: March 2015

2,5-Diphenyl-tellurophene (1) is metalated with the n-butyl-lithium/TMEDA complex. The reaction of the resulting lithiumorganic compound with electrophilic agents affords 1,4-substituted butadienes (2-8).
Derivate der cis-trans-isomeren (2-Hydroxycyclopropyl)trimethylammoniummjodide; über eine nucleophile Substitution am Dreiring unter Inversion / Derivatives of the cis-trans-Isomeric (2-Hydroxycyclopropyl)trimethyl Ammonium Iodides; on a Nucleophilic Displacement with Inversion at the Threemembered Ring
Authors: Kunz Horst
Published: March 2015

(2-trans-Hydroxycyclopropyl)trimethylammonium iodide (4) may be obtained by cleavage of the trans-benzyl ether (7) with concentrated aqueous hydrogen iodide. Under the same conditions the corresponding cis-benzyl ether (8) also gives the trans-cyclo-propanol derivative (4). For the course of the reaction, an SN2-type mechanism with inversion of configuration at the cyclopropane carbon is proposed.
Bonding in Cyclothiazenes: An Extension of DEWAR’S Islands Model
Authors: Cassoux Patrick , Glemser Oskar , Labarre Jean-François
Published: March 2015

The electronic structure of some cyclothiazenes has been investigated within the framework of CNDO/2 approximation. The results support the validity of DEWAR’S “islands” model. Stability and preferred conformations of the studied molecules were discussed in terms of transannular energy bonding and anti-bonding terms. The structural parameters of N4S4H4 were related to the protonation mechanism which has been previously analyzed in cyclophosphazenes.
Strahlenchemische Telomerisation von Äthylen mit Malonsäurediäthylester / Radiation Chemical Telomerization of Ethylene with Malonic Acid Diethylester
Authors: Kaefer P. , Saus A. , Dederichs B.
Published: March 2015

The radiation-initiated telomerization of diethyl malonate (1) and ethylene leads to the even-numbered n-alkylmalonic acid diethylesters and the even-numbered n-alkyl-n-butylmalonic acid diethylesters. The yields of the n-alkyl-n-butylmalonic acid diethylesters referring to the yields of n-alkylmalonic acid diethylesters are increased by elevating the temperature and by lowering the pressure. High temperatures and low pressures favour the formation of short-chained telomers. The product distribution is independent from the absorbed dose and the dose rate. The G-values are: G (ester) 55; G(—C2H4) 230, the activation energy is 12.5 KJ/mol, the chain-transfer constants are about 0.2, and the rearrangement constants are about 2.5.
Saure Hydrolyse von 1.3.6-Triphenyl-6-phenylazo-1.4.5.6-tetrahydropyridazin : Intermediäres „zwitterionisches” Phenyldiazen / Acid Hydrolysis of 1,3,6-Triphenyl-6-phenylazo-1,4,5,6-tetrahydropyridazine : Intermediate “Zwitterionic” Phenyldiazene
Authors: Schantl J.
Published: March 2015

The products of acid hydrolysis of 1,3,6-triphenyl-6-phenylazo-1,4,5,6-tetrahydropyridazine (1) are 1,3,6-triphenyl-1,4-dihydropyridazine (2) as well as aniline, benzenediazonium ion, phenylhydrazine and phenylazide. The latter four compounds derive from the phenylazo substituent in 1 which in the course of acid hydrolysis separates from 1 as the “zwitterionic” phenyldiazene (3 a). This intermediate 3 a can be partially trapped with triphenylcarbenium ion (6) to give phenylazo-triphenylmethane (7).
An Improved Method for the Preparation of Spin-Labeled Phosphates Using Imidazole as Transfer Agent
Authors: Sosnovsky G. , Konieczny M.
Published: March 2015

The (1-oxyl-2,2,6,6-tetramethyl-4-piperidyl)phenyl imidazole-1-phosphonate (9) is the reagent of choice for the preparation of spin-labeled phosphates 10 in yields, in most cases, exceeding 70%. The spin-labeled chloridate 8 also can be used to prepare phosphates 10, though in lower yields ranging between 27-69%.

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Über Oxocuprate, XXI Bariumoxohalogenocuprate(II) mit Strukturbeziehungen zu BaCuO2 / About Oxocuprates, XXI Barium Oxohalocuprates(II) with Structure Relationships to BaCuO2
Authors: Kipka R. , Müller-Buschbaum Hk.
Published: March 2015

Attempts to prepare BaCuO2 single crystals with a flux of BaCl2 and BaBr2 respectively lead to new oxohalocuprates(II) : Ba44Cu45O87Cl4 (A) and Ba88Cu88O175Br2 (B). Single crystals were investigated by X-ray methods (cubic unit cell: (Α) a = 1827 pm, (B) a = 1830.3 pm, space group Oh
9-lm3m). The complicated crystal structures of both compounds are discussed. There are very interesting relationships to BaCuO2.