bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthese und Absolute Konfiguration von (+)-1-Amino-2-propanthiol·HCl / Synthesis and Absolute Configuration of ( + )-1-Amino-2-propanethiol · HCl
Authors: Elz Sigurd , Dräger Martin , Sattler Hans-Joachim , Schunack Walter 
Published: March 2015

)-4a-
The structure of (-)-5-methyl-2-phenylthiazolidine (( -)-4a), an intermediate in the synthesis of (+)-1-amino-2-propanethiol · HCl ((+)-2 · HCl), was elucidated by 1H and 13C NMR spectroscopy. In contrast to earlier findings it was shown that the important intermediate ( -)-4a is not a single diastereomer but represents a 1:1 mixture of (2R,5Sand ((2S,5S)-4a-diastereomers. The absolute configuration of the (2S,3S)-di-O-(4-toluoyl)tartrate of the disulfide (5) derived from (+)-2 · HCl was determined to be (S,S) using X-ray technique.
Chemie an starren Grenzflächen, 7 [1] Ausgewählte Beispiele der chemischen Grenzflächenmodifizierung von Aerosil / Chemistry at Rigid Surfaces, 7 [1] Selected Examples of the Chemical Surface Modification of Aerosil
Authors: Horner Leopold , Ziegler Hans 
Published: March 2015

Aminoaerosil containing primary amino end groups is obtained according (1) by reaction of aerosil with γ-triethoxysilylpropyl amine (Table II).
The NH2-anchor groups are acylated in the usual manner: carbonic acid anhydrides, acid chlorides and acid azides and by application of the carbodiimide method (Table III). Optically active groups and phosphoric acid diestergroups are covalently linked with the surface of aerosil according (2) and (3). Aminoaerosil reacts with vinylsulfones as anchor groups of dyes (Remazol- Dyes) producing a covalent bond according (6).
Functional groups linked to the surface of aerosil react “normal” (with respect to homogenous solutions) with group specific reagents. Examples: bromination, ozonization of C-C double bonds, hydrolysis of phosphoric acid esteramidates and surface bound chloroamine-T groups. "Interparticular" reactions of modified aerosil are not observed. But aerosil with electroactive groups are electroreduced using Hg- or Pb-electrodes.
The optical induction of the catalytic hydrogenation of prochiral defines using palladium deposited on chiral modified aerosil surfaces is low (ca. 1%).
Some analytical methods are presented, which are recommended for the determination of the amount of functional groups bound to the surface.
Darstellung von monomerem Methylenaminoacetonitril H2C = N —CH2—CN in der Gasphase [1]
Authors: Dammel Ralph , Bock Hans 
Published: March 2015

Abstract
The reactive intermediate methyleneaminoacetonitrile H2C = N - C H2 - CN has been generated via thermal retrotrimerization of N ,N',N"-tris(cyanomethyl)hexahydro-s-triazine and characterized by its photoelectron, mass and low-temperature NMR spectra. A fully geometryoptimized MNDO calculation allows to assign the observed ionization energies and yields estimates for other molecular properties, e.g. a rather high dipole moment.
Die Struktur von Undecacarbonyl-(μ-trifluormethylisocyanid)trieisen Fe3(μ-CNCF3)(CO)11 in Lösung
Authors: Lentz Dieter 
Published: March 2015

Abstract
According to its 13C NMR spectra, undecacarbonyl-(μ-trifluorom ethylisocyanide)triiron, Fe3(μ-CNCF3)(CO)11 , is only partly nonrigid in solution even at ambient temperature. However, on cooling to -100 °C the molecule is rigid on the NMR time scale.
Der elektronisch stabilisierende Beitrag des Ph3P=N-Liganden. Darstellung von CH3WCl4N =PPh3 und das elektrochemische Verhalten von Ph3PN-substituierten Wolfram(VI)-Halogeniden
Authors: Roesky Herbert W. , Tojo Tetsuro , Ilemann Michaela , Westhoff Dieter 
Published: March 2015

Abstract
The reaction of CH3WCl5 and Me3SiN = PPh3 yields CH-3WCl4N = PPh3 (1). The electrochem ical reduction of 1, F5WN = PPh3 (2) and F4W (N = PPh3)2 (3) has been investigated using cyclic voltammetry and potentiostatic methods. The cyclic voltammogram of 1 shows two reduction waves at Ef + 1.72 and 0.420 V. The controlled potential reduction of 1 indicates two steps of reversible one-electron charge transfers. The cyclic voltammograms of 2 and 3 in CH2Cl2 show reversible one-electron waves at Ef -0.45 and -1.45 V, respectively. The reduced products were analyzed by 19F and 31P NMR spectroscopy.
tert-Butylimino-cyclopentadienyIvanadiuni(V)-Verbindungen Darstellung, Struktur und NMR-spektroskopische Untersuchungen
Authors: Preuss Fritz , Becker Harald , Häusler Hans-Joachim 
Published: March 2015

Abstract
The cyclopentadienyl compounds tC4R9N = VCpCl2 (2). tC4H9N = VCp(OtC4H9)Cl, tC4H9N = VCp(OtC4H9)(R) (R = CH3, "C4H9, CH2SiMe3), tC4H9N = VCp2(OtC4H9) (5) and ,tC4H9N = VCp(OtC4H9)2 have been prepared starting from tC4H9N = VCl3
1H and 51V NMR spectra are discussed; except for 5, the C5H5 rings are η5-coordinated to the metal atom. The temperature dependence of the 1H NMR spectrum of 5 indicates two types o f intramolecular rearrangements: η1/η5-Interchange of the C5H5 rings and fluxional behavior of the η1-C5H5 ring. The molecular structure of 2 has been investigated by X-ray diffraction analysis.
Übergangsmetallkomplexe instabiler Ylide, X [1] Chemische und elektrochemische Untersuchungen zu den Redox-Eigenschaften cyclischer Tetracarbonylchrom-Ylidchelatkomplexe / Transition Metal Complexes of Unstable Ylides, X [1] Chemical and Electrochemical Investigations of the Redox Properties of Cyclic Tetracarbonylchromium-Ylide-Chelate-Complexes
Authors: Weber Lothar , Lücke Ewald , Kölle Ulrich , Ohst S. 
Published: March 2015

Abstract
Treatment of the ylide chelate complexes (CO)4

(1) with (C5H5)2Fe+PF6
- leads to the organometallic radical cations 2. The oxidation process of 1 is also checked electrochemically by means of cyclovoltammetry, which exhibits a reversibel one electron oxidation between -0.1 and +0.3 V vs. SCE. These potentials are more negative than in any other complex of the general type Cr(CO)4L2 (L e.g. = PR3, CNR).
Zur Azulen-Azulen-Umlagerung des 1-Phenylazulens
Authors: Wetzel Arthur , Zeller Klaus-Peter 
Published: March 2015

Abstract
1-Phenyl-[3-13C]- (8) and 1-phenyl-[4-13C]azulene (19) are prepared using ethyl [2-13C]acetate and [formyl-13C]dimethylformamide as 13C-sources. The thermal azulene-azulene rearrangement of 8 and 19 yields 2-phenyl-[3a-13C]azulene and 2-phenyl-[4-13C]azulene, respectively. In com bination with earlier results it is concluded that in the skeletal rearrangement the carbon atoms of the five-m em bered ring are shifted by one position, whereas the carbon atoms C-4-C-8 of the seven-membered ring remain at their original position.
Oxidative Addition von H2 und HCl an Iridium-Schwefelmonoxid- und Schwefeldioxid-Komplexe/ Oxidative Addition von H2 und HCl an Iridium-Schwefelmonoxid- und Schwefeldioxid-Komplexe
Authors: Schenk Wolfdieter A. , Leißner Johanna 
Published: March 2015

Abstract
Square planar iridium(I) complexes of sulfur monoxide and sulfur dioxide undergo oxidative addition with dihydrogen and hydrogen chloride. The resulting hydrido-iridium(III) complexes have been characterized by 1H , 31P NMR and IR spectroscopy. The limited stability of the sulfur monoxide derivatives is explained as resulting from decreased back-bonding between iridium and sulfur.
Reaktive E = C (p—p) π -Systeme, XI. Hydrometallierungsreaktionen des Perfluor-2-phosphapropens F3CP = CF2/ Reactive E = C (p —p) π -Systems, XI. Hydrometallation Reactions of Perfluoro-2-phosphapropene F3CP = CF2
Authors: Grobe Joseph , Le Van Duc , Nientiedt Jürgen 
Published: March 2015

Abstract
The reactions of F3CP = CF2 (1) with Me3GeH, Me3SnH, and (C5R5)(CO)3MH (M = Cr. Mo, W; R = H , Me) proceed via addition to the PC double bond yielding tertiary phosphanes of the type Me3M′P(CF3)CF2H[M′ = Ge (2), Sn (3)] or (C5R5)(CO)3MP(CF3)CF2H [R = H; M - Cr (6), Mo (7). W (8); R = Me; M = Mo (9), W (10)]. 2 and 3 are labile compounds, which decompose by elimination of Me3M′F , a reaction which in the case of 3 has been used to prepare the new phosphaalkene F3CP = C(H)F (5) and its [2+4]-cycloaddition product 4 with 2.3-dimethyl-1.3- butadiene. The H substituent (instead of F) in 5 and its derivatives has a surprising influence not only on the stability of the compounds but also on their spectroscopic data, as shown by com parison with 1 and derivatives of the type Me3M ′P(CF3)2 and (C5H5)(CO)3MP(CF3)2. respectively. New compounds are characterized by NMR, MS. GC/MS and IR measurements.
1-O-(13-Methyl-1-Z-tetradecenyl)-2-O-(13-methyItetradecanoyl)- glycero-3-phospho-ethanolamin, ein Plasmalogen aus Myxococcus stipitatus/ 1-O-(13-Methyl-1-Z-tetradecenyl)-2-O-(13-methyltetradecanoyl)-glycero-3-phosphoethanolamine, a Plasmalogen from Myxococcus stipitatus
Authors: Stein J. , Budzikiewicz H. 
Published: March 2015

Abstract
The structure of 1-O-(13-methyl-1-Z-tetradecenyl)-2-O-(13-m ethyltetradecanoyl)-glycero- 3-phospho-ethanolamine isolated from Myxococcus stipitatus has been elucidated. 1H and 13C NMR as well as mass spectral data have been accumulated which allow a ready identification and structure elucidation of compounds of this type.
Molecular Determinants for Drug Receptor Interactions, 9 1H and 13C NMR Spectra of the Narcotic Antagonist N-Allyl-N-normetazocine by Two-Dimensional Chemical Shift Correlation Spectroscopy
Authors: Perly Bruno , Le Bail-Richer Patricia , Pappalardo Giuseppe C. , Grassi Antonio 
Published: March 2015

Abstract
The high frequency 1H and 13C NMR spectra (at 500 and 75.47 MHz, respectively) of N-allyl- N-normetazocine (NAM) hydrochloride in 2H2O solution were run and fully analyzed with the aid of both homonuclear 1H -1H and heteronuclear 13C - 1H chemical shift correlation experiments. Selective broadening of the signals of the protons in 3-, 4-, 8-, 9-, 12-positions was observed at temperatures <350 K. This was found to be consistent with an inversion process occurring between the N-equatorial and N-axial configurational isomers of NAM whose rate of exchange is of the same order of magnitude of the chemical shifts differences at 500 MHz. The increase of temperature at 350 K is thus adequate to make “fast” the process in the NM R time scale and then to resolve the spectral portions.
The experimental proton-proton coupling constants were found to be consistent with a slightly distorted chair conformation of the piperidinic ring in NAM hydrochloride.
The 13C NMR spectrum showed the distinct spectra of the two conformers, which are present in the ratio of ca. 80 (N-equatorial) : 20 (N -axial). The field frequency employed for the experiment was therefore sufficient to make “slow” the exchange process between the two isomeric forms, whose resonance peaks could be isolated in the non-acidified solution.
Notizen: Versuche zur Herstellung eines Alkenyl(dimethyl)zinnhydrids: Gibt es eine intramolekulare Sn–H–B-Brücke?/ Attempts at the Synthesis of an Alkenyl(dimethyl)tin Hydride: Is there an Intramolecular Sn–H–B Bridge?
Authors: Kerschl Susanna , Wrackmeyer Bernd 
Published: March 2015

Abstract
2-(E)-Dim ethyl(chloro)stannyl-3-diethylboryl-2- pentene (lc) reacts with trimethyltin hydride (3) to give the corresponding alkenyl(dim ethyl)tin hydride (2). Compound 2 has been characterized by 1H, 11B, 13C, 119Sn NMR . Neither the NMR nor the IR data are in support of an intramolecular Sn-H-B bridge.
Synthese und Kristallstruktur siebengliedriger kohlenstoffhaltiger Schwefel-Stickstoffringe / Synthesis and Crystal Structure of Seven-M embered Sulfur Nitrogen Rings Containing Carbon
Authors: Roesky Herbert W. , Benmohamed Nasreddine , Keller Klaus , Keweloh Nayla , Noltemeyer Mathias , Sheldrick George M. 
Published: March 2015

Abstract
The reaction of ClSCF2CF2SCl and (Me3SiN)2SR2 proceeds with formation of the seven-membered ring compounds 4a, R = CH3, and 4b, R = C2H5. 4a was shown by an X-ray structure determination to contain a non-planar ring system.
Synthese und Eigenschaften von 3,6-Diorgano-3,6-dithio-1,2,4,5,3,6-tetrathiadiphosphorinanen; eine neue Möglichkeit zur Knüpfung von S—S-Bindungen / Synthesis and Properties of 3,6-D iorgano-3,6-dithio-1,2,4,5,3,6-tetrathiadiphosphorinanes; a New Possibility of Forming S—S Bonds
Authors: Hahn Josef , Nataniel Tina 
Published: March 2015

Abstract
The six-membered sulfur-phosphorus heterocycles 3,6-diorgano-3,6-dithio-1,2,4,5,3,6-tetrathiadiphosphorinanes (RP(S)S2)2 (R = Me 1a and R = t-Bu 1b ) are formed in high yields from the silyl esters of the corresponding trithiophosphonic acids RP(S)(SSiMe3)2 and dimethylsulfoxide. They are fairly stable in the crystalline state. In solution sulfur elimination occurs, which in the case of l a leads to the formation of 3,5-dimethyl-3,5-dithio-1,2,4,3,5-trithiadiphospholane, MeP(S)S2PMe(S)S (4). Likewise lb decomposes to give the corresponding dithiophosphonic acid anhydride (t-BuP(S)S)2. According to NMR spectroscopic conformational analysis, 1a exists in four isomeric forms: two chair and two twist-boat conformations, which differ in the orientation (cis or trans) of the Me groups. The isomeric distribution indicates that the Me groups prefer the axial positions. As a consequence of steric bulk, 1b is only present in the twist-boat conformation with trans orientation of the t-Bu substituents.
Zur Reaktion von Bis(dimethyIamino)phosphaten mit Antimon(V)chlorid / The Reaction of Bis(dimethylamino)phosphates with Antimony(V) Chloride
Authors: Knödler F. , Schwarz W. , Schmidt A. 
Published: March 2015

Abstract
Potassium bis(dim ethylamino)phosphate monohydrate reacts with antimony(V) chloride to yield the 1:1 adduct 2 of bis(dimethylamino)phosphoric acid and antimony(V) chloride, while anhydrous tetramethylammonium bis(dimethylamino)phosphate affords, in comparison, the dimeric tetrachloroantimony(V) bis(dimethylamino)phosphate (1). The molecular structures of 1 and 2 have been determined by X-ray analysis. The vibrational and mass spectra are reported and briefly discussed.
Ubergangsmetallkomplexe mit Schwefelliganden, XXXIII*/ Transition Metal Complexes with Sulfur Ligands, XXXIII*
Authors: Sellmann Dieter , Binker Gerhard , Knoch Falk 
Published: March 2015

Abstract
In order to investigate the specific properties which are associated with metal sulfur cen­ters, the system Ru/S2C6H4
2- has been studied with respect to the synthesis of new com­plexes and their reactions as well as their structure. cis-(NBu4)(Ru(NO))(PMe4)(S2C6H4)2] reacts with an excess of PMe3 in boiling THF to give the paramagnetic (μeff = 0,96 B. M., 295 K) trans-(NBu4)(Ru(PMe4)2(S2C6H4)2) (I). A plausible intermediate in this reaction is the nitrido complex (NBu4)(Ru(N)(S2C6H4)2) (2) since 2 gives with one equivalent of PMe3 a very labile product which is probably (NBu4)(Ru(N)(PMe4)(S2C6H4)2) (3). but reacts with an excess of PMe3 even at 20 °C to give 1.
The Ru(III) complex 1 is easily oxidized by O2 or PhN2BF4 to yield the diamagnetic Ru(IV) species trans-(Ru(PMe3)2(S2C6H4)2) (4). Remarkably, the transformation of 1 into 4 is achieved also by H+ ions, providing a model reaction for the coupled H+-electron transfer which has been discussed for substrate reactions at metal sulfur centers of enzymes. - The reaction of RuCl2(PMe3)4 with S2C6H4
2- yields [Ru(PMe3)4(S2C6H4)] (5) at 20 °C, even if an excess of S2C6H4
2- is applied. Upon heating in THF or EtOH, 5 looses one PMe3 ligand to give the 16e -complex [Ru(PMe4)4(S2C6H4)] (6) which rapidly coordinates CO to give [Ru(CO)(PMe4)4(S2C6H4)] (7); '1P NMR indicates a meridional coordination of PMe4 in 7, and consequently CO must be trans to S2C6H4
2-. 6 reacts also with LiAlH4 to yield a very sensitive hydride complex to which the tentative formula [Ru(H)2(PMe3)2(S2C6H4)] is assigned. All compounds were characterized by elemental analyses and spectroscopic means, the structures of I and 5 were determined by X-ray structure analysis.
Reaktionen von Silylphosphanen mit Halogenokomplexen von Übergangsmetallen: Synthese, Struktur und Eigenschaften von Komplexen des Typs cis-X(CO)4Mn{PPh3-n(SiMe3)n} (n = 1 -3 ) und [{Cp(CO)2Fe}2PPhR]X (R = Ph, H) bzw. [{Cp(CO)2Fe}3PH]X (X = CI, Br, I) / Reactions of Silylphosphanes with Halogeno Complexes of Transition Metals: Synthesis, Structure and Properties of Complexes cis-X (CO)4 Mn{PPh3-n(SiMe3)n} (n = 1 -3 ), [{Cp(CO)2 Fe}2 PPhR]X (R = Ph, H) and [{Cp(CO)2 Fe}3 PH]X (X = Cl, Br, I)
Authors: Effinger Guido , Hiller Wolfgang , Lorenz Ingo-Peter 
Published: March 2015

Abstract
The reactions of pentacarbonylmanganese halides (CO)5MnX (X = Cl, Br, I) with the silyl- phosphanes Ph3-nP(SiMe3)n (n = 1 -3) at ambient temperature result in the elimination of one CO ligand and the formation of c/s-configurated substitution products X(CO)4Mn{PPh3-n(SiMe3)n). No CO-substitution, but Me3SiX-elimination is observed in the reaction of Ph3-nP(SiMe3)„ with the dicarbonylcyclopentadienyliron halides CpFe(CO)2X to give the di- and triferriophosphonium halides [{Cp(CO)2Fe}2PPhR]X (R = Ph, H) and [{Cp(CO)2Fe}3PH]X (X = Cl, Br, I). The mass, IR and NMR spectra are reported and discussed. The crystal structures of Cis-I(CO)4MnPPh2SiMe3 and [(Cp(CO)2Fe)2PPh2]I have been determined.
Darstellung und Kristallstrukturen von (PH4P)4Sb8I28 und (Ph4P)Sb3I10(Ph = C6H5) / Synthesis and Crystal Structures of (PH4P)4Sb8I28 and (Ph4P)Sb3I10(Ph = C6H5)
Authors: Pohl Siegfried , Saak Wolfgang , Haase Detlev 
Published: March 2015

Abstract
The compounds (Pn4P)4Sb8I28 (1) and (Ph4P)Sb3I10 (2) were prepared by the reaction of SbI3 and Ph4PI in acetonitrile (molar ratios 2:1 and 3:1 respectively). The structures of 1 and 2 were determined from single crystal X-ray diffraction data.
1 crystallizes in the triclinic space group P1̄ with a - 1321.7(5). b = 1346.7(5), c = 2201.8(8) pm, α = 104.18(2). β = 99.92(2), γ = 100.33(2)°; 2: monoclinic, C2/c, a = 2371.1(2), b = 745.0(1), c = 2495.1(2) pm, β = 100.75(1)°.
Whereas 1 exhibits isolated Sb8I28
4- ions, the anions of 2 are built up of polymeric chains [Sb3I10
- ]∞. In both compounds the distorted Sbl6 octahedra are linked by common edges. The Sb-I distances are in the range between 277.4 and 354.8 pm (1) and between 277.4 and 342.4 pm (2). The observed structures do not only depend on stoichiometry, the nature of the counter cations, and the possibility of oligomerisation but also on the wide variety of the Sb-I bond strengths and the different bridges formed by iodine.
The lone pair of Sb(III) seems to be predominantly 5 s2.
Zur Bildungskinetik des Zeolithen ZSM-11 / On the Kinetics of Formation of the Zeolite ZSM-11
Authors: Hund Matthias C. , Tißler Arno , Polanek Peter , Dräger Martin , Unger Klaus K. 
Published: March 2015

Abstract
The synthesis of pentasil ZSM-11 with Bu4NHSO4 as template was first optimized in a tefloncoated autoclave of 200 ml volume (163 °C, 3 days) and then transferred to a stirring autoclave of 1000 ml volume. The latter allowed sampling over the period of crystallization. Pure ZSM-11 crystallized at temperatures between 150 and 180 °C. In this range the induction period decreased from 15 to 2 hours while the rate of crystallization was enhanced from 2.5 to 5.6% per minute. From these values energies of activation for nucleation and crystallization were determined (99.8 and 43.4 kJ mol-1).
Neuartige basische Liganden für die homogenkatalytische Methanolcarbonylierung, XI [1]. Ether-Phosphan-Cobalt-Komplexe in der katalytischen Methanolhydrocarbonylierung zu Acetaldehyd / Novel Basic Ligands for the H om ogeneous Catalytic Methanol Carbonylation, XI [1]. Ether Phosphane Cobalt Complexes in the Catalytic Hydrocarbonylation of Methanol to Acetaldehyde
Authors: Lindner Ekkehard , Schober Uwe , Glaser Erhard , Norz Hubert , Wegner Peter 
Published: March 2015

Abstract
PhP(CH2C4H7O2)2 (1) and [-CH2(Ph)P~D]2 (3a-c) [D = CH2C4H702 (a), CH2C4H7O (b). CH2CH2OCH3 (c)] are obtained by reaction of Li2PPh and Na(Ph)P~D with ClCH2C4H7O2 and C1CH2CH2Cl, respectively. 1 and 3a, b give rise to high selectivities and conversions in the cobalt catalyzed hydrocarbonylation of methanol to acetaldehyde. Model complexes of cobalt which are of importance in the catalytic cycle are synthesized. Complexes of the type X2Co(Ph2P~D)2 (6az, 6bx-bz, 6cx-cz), especially those with X = I, obtained from CoX2 [X = Cl (x), Br (y), I (z)] and the ether phosphanes Ph2P~D (5a-c), are regarded as precursors of the catalytically active species. With K[HB(sec-C4H9)3] they are reduced to the cobalt(I) complexes XCo(Ph2P~D)(Ph2P~D) (7az, 7bx-bz, 7cx-cz). Trapping reactions with CO, PPh3 or 5b, c lead to the compounds XCo(CO)2(Ph2P~D)2 (8az, 8bx-bz, 8cx-cz), XCoPPh3(Ph2P~D)2 (9bx-bz). and XCo(Ph2P~D)3 (10bz, cz), respectively, with cleavage of a Co-O bond. The reduction of X2Co(PPh3)2 (11x, z) with K[HB(sec-C4H9)3] represents a simple method for the preparation of the complexes XCo(CO)2(PPh3)2 (13x, z) which are formed from the intermediates XCo(PPh3)2 · THF (12x, z) in the presence of CO.
Wechselwirkung des Vanadyl(IV)-Kations mit Nucleotiden in wäßriger Lösung / Interaction of the Vanadyl(IV) Cation with Nucleotides in Aqueous Solution
Authors: Urretavizcaya G. , Baran E. J. 
Published: March 2015

Abstract
The interaction of VO2+ with mono-, di- and trinucleotides and with some of the related nucleosides and bases, was investigated spectrophotometrically at pH = 4.9. The results point to a preferential interaction of the cation with the phosphate groups of all the nucleotides whereas no interaction with the nucleosides and bases was detected. The vanadyl coordination sphere shows some distortive effects in the case of mononucleotides whereas it appears more regular in the case of di- and trinucleotides. At high pH-values the cation interacts with the deprotonated OH-groups of the ribose moieties. This type of interaction was confirmed by direct measurements with pure ribose and ribose-5′-phosphate, and it was absent in the case of thymidine nucleotides, in which ribose is replaced by 2′-deoxyribose.
Verteilung und Valenz der Kationen in Spinellsystemen mit Eisen und Vanadium, V Röntgenographische und Mößbauer-spektroskopische Untersuchung des Spinellsystems FeV2O4—MgV2O4 / Distribution and Valence of the Cations in Spinel Systems with Iron and Vanadium, VX-Ray and Mössbauer Investigation of the Spinel System FeV2O4—MgV2O4
Authors: Riedel Erwin , Alisch Christian 
Published: March 2015

Abstract
In the spinel system FeV2O4-MgV2O4 pure Fe(II)-spinels could not be prepared. Mössbauer spectra show that the solid solution has the composition Fex
2+ Mg1-x[Fey
3+V2-y]O4. with y depend­ing on the partial pressure of oxygen during preparation.
Phosphaniminatokomplexe von Molybdän(V). Die Kristallstruktur von [MoCl4(NPPh3)]2 / Phosphaneiminato Complexes of Molybdenum(V). The Crystal Structure of [MoCl4(NPPh3)]2
Authors: Hosier Klaus , Weller Frank , Dehnicke Kurt 
Published: March 2015

Abstract
[MoCl4(NPPh3)]2 is prepared by the reaction of Mo2Cl10 with Ph3PNSiMe3 in boiling CH2Cl2 as brown paramagnetic (μeff = 1.72 B.M. at 20 °C) crystals, which contain ~2 mol CH2Cl2 per formula unit. With PPh4Cl the yellow complex PPh4[MoCI3(NPPh3)] · CH2Cl2 is formed. The IR spectra are recorded and discussed. [MoCl4(NPPh3)]2 crystallizes monoclinically in the space group P21/n with two formula units per unit cell (3146 observed independent reflexions, R = 0.046). The cell dimensions are a = 981.6; b = 1401.7; c = 1743.1 pm; β = 101.15°. The complex is centrosymmetric dimer showing MoCl2Mo bridges with Mo-Cl bond lengths of 244 and 278 pm. respectively. The Mo=N = P axis is nearly linear (bond angle 168.5°) with bond lengths MoN = 172 pm and PN = 166 pm. which correspond to double bonds.
Mild and Efficient Oxidative Cleavage of N,N-Dialkylhydrazones to Ketones with Sodium Perborate
Authors: Enders Dieter , Bhushan Vidya 
Published: March 2015

Abstract
N,N-Dialkylhydrazones, such as dimethyl- and SAMP-hydrazones, are efficiently cleaved back to their parent ketones under mild conditions at pH 7. The oxidative hydrolysis is effected in good yields with the very cheap bulk chemical sodium perborate in buffer solution and tert-butanol as cosolvent.