bluuebunny/crossref_metadata_2025_split huggingface dataset:
Darstellung und Kristallstruktur von Na4GeSe4: Ein neues ortho-Selenogermanat(IV)
Authors: Klepp Kurt O. 
Published: March 2015

Abstract
Na4GeSe4 was obtained from a stoichiometric melt of Na2Se, Ge and Se at 750 °C. It crystallizes with a new orthorhombic structure, space group Pnma, with a = 28.518(8), b - 9.447(5), c = 7.128(2) Å , Z = 8. The crystal structure was refined to a conventional R of 0.074 for 1236 reflections with I > 3 σ (I) (diffractometer data). It is characterized by discrete GeSe4
4--anions with almost regular tetrahedral geometry. Two independent anions appear in the structure, the mean Ge - Se-bond lengths are 2.345 and 2.353 Å, resp. The Na+-ions are coordinated to 4 -6 chalcogen atoms in the range 2.88-3.28 Å. The structure is composed of mixed cation-anion-slabs, 2
∞ [Na2(GeSe4)2-], which run parallel to the bc-plane and are separated from each other by corrugated 36-layers of Na+-ions.
Me3CS(NH)NH2 und PhS(NH)NH2, die ersten primären Sulfinsäureimidamide
Authors: Hänssgen Dieter , Steffens Reinhard 
Published: March 2015

Abstract
The stepwise methanolysis of N-Lithiom ethanesulfinic acid imide amides [MeS(NSiMe3)NR']Li (l1a ,b), R' = CMe3 (a), R' = SiMe3 (b), leads to the formation of the corresponding NH compounds MeS(NSiMe3)NHR' (2a,b) and MeS(NH)NHR ' (3a), respectively. Primary sulfinic acid imide amides RS(NH)NH2 (5a,b ) are obtained for the first time in the solvolysis reaction of [RS(NSiMe3)2]Li (4a,b), R = CMe3 (a), R - Ph (b), with excess m ethanol. - Metathesis of 4b with chlorotrimethylsilane at 20 °C gives PhS(NSiMe3)N(SiMe3)2 (6). Under similar conditions 4a does not react with chlorotrimethylsilane. At higher temperatures a reductive elimination of isobutene takes place and the diaminosulfane (M e3Si)2N -S-NHSiMe3 (7) is formed.
Perfluormethyl-Element-Liganden, XXXIV* 55Mn-NMR-Untersuchungen an Zweikernkomplexen des Typs Mn2(CO)8E(CF3)2Y (E = P, As; Y = Hal und E' R; E' = S, Se, Te)
Authors: Grobe Joseph , Vetter Joachim , Rehder Dieter 
Published: March 2015

Abstract
Dinuclear complexes of the type {(CO)4Mn}μ-E(CF3)2, μ-Y {Mn(CO)4} (E = P, As; Y = Cl, Br, I; SR, SeR , TeR , with R varying over a wide range of inductive, mesomeric and steric properties) have been investigated by 55Mn NMR spectroscopy. The NMR signals cover the range of -415 to -1450 ppm (relative to aqueous KMnO4); half-widths are between 400 and several thousand Hz. The 55Mn - 31P one-bond coupling is usually unresolved, an exception being the complex with two P(CF3)2 bridges [J(MnP) = 152 Hz], The temperatur gradient for δ(55Mn) is 1.2 ppm/deg. Shielding of the 55Mn nucleus is discussed with respect to δ and π
bonding effects and the polarizability (electronegativity) of the bridging functions. With Y = SP(CF3)2 and SeP(CF3)2, five-ring system s with two inequivalent manganese sites are formed, which give rise to two 55Mn NMR signals, the sharper resonance for the site of higher symmetry [Mn{P(CF3)2}2] lying at -1750 ppm.
Beiträge zur Chemie des Siliciums und Germaniums, XXXVIII. Systematische Untersuchungen über die Reaktion von höheren Silanen mit Kaliumsilyl/ Contributions to the Chemistry of Silicon and Germanium, XXXVIII. Systematic Investigations on the Reaction of Higher Silanes with Potassium Silyl
Authors: Fehér Franz , Krancher Michael 
Published: March 2015

Abstract
Potassium disilanyl, KSi2H5, 2-potassium trisilanyl, KSiH(SiH3)2, and 2-potassium isotetrasilanyl, KSi(SiH3)3, are formed in the reactions of potassium silyl. KSiH3, with di-, tri-, n-tetra-, /so-tetra- and pentasilane, respectively. The simultaneous formation of potassium hydride can be almost completely avoided by carrying out the reactions in very diluted solution. The product mixtures formed have been analyzed by gas chromatography after reaction with benzylchloride, potassium hydride then giving toluene. A mechanism for the stepwise formation of the various higher potassium silanyls is discussed.
Das Trimetaselenoarsenit-Anion As3Se6
3– Darstellung und Struktur von [Sr(en)4]2(As3Se6)Cl/ The Trimetaselenoarsenit Anion As3 Se63 Preparation and Structure of [Sr(en)4]2 (As3 Se6)Cl
Authors: Sheldrick W. S. , Kaub J. 
Published: March 2015

Abstract
[Sr(en)4]2(As3Se6)Cl 1 has been prepared by the reaction of SrCl2 with As2Se3 in ethylenediamine solution under reflux and its structure established by X-ray structural analysis. 1 contains discrete cyclic As3Se6
3- anions with a six-membered As3Se3-ring in the chair conformation. A bridging ethylenediamine molecule leads to the formation of [Sr(en)4]n chains for the first of the Sr cations. In contrast, discrete Sr(en)4 units are observed for the second cation.
Synthese und Strukturuntersuchungen von Iodocupraten(I) VI. Iodocuprate(I) mit zweikernigen Anionen [CU2I4]2- und [Cu2I6]4-/ Syntheses and Structure Analyses of Iodocuprates(I) VI. Iodocuprates(I) with Dinuclear Anions [Cu2I4]2- and [Cu2I6]4-
Authors: Hartl Hans , Brüdgam Irene , Mahdjour-Hassan-Abadi F. 
Published: March 2015

Abstract
Bis(dipyridiniomethan)-di-μ-iodotetraiododicuprate(I), [Py2CH2]2[Cu2I6] and two modifications of bis(tetraphenylphosphonium )-di-μ-iodo-diiododicuprate(I) were obtained by reacting Cu with I2 and [Py2CH2]I2 or [PPh4]I in acetone. The crystal structures of these com pounds are built up by the cations and the binuclear anions: edge sharing Cul4-tetrahedra in [Cu2I6]4- and edge sharing, nearly trigonal planar Cul3-units in [Cu2I4]2-. Whereas the Cu2I4 anions (-A ) are centrosymmetric and almost planar, the anions (-B) are folded about the bridging I···I contact. The anions [Cu2I6] are in intimate contact with the cations via short intermolecular I···N and I···C interactions.
Notizen: Darstellung und Kristallstruktur einkerniger, paramagnetischer Pd- und Pt-Komplexe/ Preparation and Crystal Structure of Mononuclear, Paramagnetic Pd- and Pt-Complexes
Authors: Fenske Dieter , Bensmann Walter 
Published: March 2015

Abstract
[2,3-Bis(diphenylphosphino)m aleicanhydride]- MCl2 (M = Pd, Pt) reacts with M (PPh3)4 (M = Pd, Pt) to form paramagnetic, mononuclear complexes of Pd (Pt). It is shown by EPR , IR and X-ray examination, that the unpaired electron is delocalized on the bidentate phosphine ligand.
lodsubstituierte Eisen-Schwefel-Cluster: Neue Synthesen sowie zur Bildung und Stabilität von Fe2S2I4
2-, Fe4S4I4
2– und Fe6S6I6
2-. Die Kristallstruktur von (Et4N)6(Fe4S4l4)2Fe2S2l4 / Iodine Substituted Iron-Sulfur-Clusters: Novel Syntheses, Formation and Stability of Fe2S2I4
2-, Fe4S4I4
2- und Fe6S6I6
2-. The Crystal Structure of (Et4N)6(Fe4S4l4)2Fe2S2l4
Authors: Saak Wolfgang , Pohl Siegfried 
Published: March 2015

Fe4S4I4
2- has been prepared in tetrahydrofuran (THF) solution by the reaction of Fe, S8, I2, and Me3NCH2Ph+TI-, and isolated as black, fairly air-stable crystals of (Me3NCH2Ph)2Fe4S4I4 (1) in nearly quantitative yield. 1 reacts with iron and iodine or with elemental sulfur and Fel2 in CH2Cl2 solution to form Fe6S6I6
2- which was isolated as black crystals of (Me3NCH2Ph)2Fe6S6I6 (5). In THF solution Fe6S6I6
2- is converted to Fe4S4I4
2- which was isolated as Fe(THF)6Fe4S4I4·4 THF (3). Evidence is presented for an equilibrium between Fe2S2I4
2- and Fe4S4I4
2-, Fel4
2- and sulfur when iron, sulfur, iodine and Et4N+I- react (with the required stoichiometry) to form Fe2S2I4
2- in CH2Cl2 solution. From this solution (Et4N)6(Fe4S4I4)2Fe2S2I4 (6 ) crystallizes as black needles (tetragonal, P42bc, a = 2467.9, b = 1653.8 pm, Z = 4). Crystals of 6 consist of the discrete anions Fe4S4I4
2- and Fe2S2I4
2- and Et4N+ cations. The [Fe4S4]2+ core does not exhibit the usually observed core distortion.
This clearly demonstrates that additional ligands (THF, CH3CN, iodide ions etc.) strongly reduce the stability of iodine substituted Fe/S clusters (except [Fe4S4]2+ cores!).
The biological relevance of the observed rearrangements is discussed.
Stoffwechselprodukte von Mikroorganismen, XXXI [1]. Duricaulinsäure, ein neuer Naturstoff vom Phthalimidin-Typ aus Aspergillus duricaulis / Metabolie Products of Microorganisms, XXXI [1]. Duricaulic Acid, a New Natural Product of the Phthalim idine Type from Aspergillus duricaulis
Authors: Achenbach Hans , Mühlenfeld Andreas , Kohl Werner , Brillinger Gert-Ulf 
Published: March 2015

Duricaulic acid (1), a new nitrogen containing metabolite was isolated from Aspergillus
duricaulis and its structure established. 1H and 13C NMR of some phthalimidines are discussed.
Cyanothioacetamide in Heterocyclic Synthesis: A New Approach for the Synthesis of 2-Pyridothione and 2-Pyridazinothione Derivatives
Authors: Mohareb R. M. , Fahmy S. M. 
Published: March 2015

Abstract
Cyanothioacetamide (1) undergoes self condensation to give 4,6-diamino-3-cyano-2-pyrido-thione (2). The latter was utilised in synthesis of pyrido[2,3-c]pyrazole, pyrido[2,3-d]pyrim idine, bis-(pyridothione derivatives) through reaction with hydrazine hydrate, ethoxycarbonyl isothio-cyanate and cinnamonitrile derivatives. Also 1 undergoes self dimerisation to give 13, the latter form the pyridazine derivative on coupling with benzenediazonium chloride.
Chemilumineszenz von Photoprodukten polyzyklischer aromatischer Kohlenwasserstoffe und deren Carbonylverbindungen / Chemiluminescence of Photoproducts of Polycyclic Aromatic Hydrocarbons and their Carbonyl Compounds
Authors: Stauff Joachim , Stärk Gerhard 
Published: March 2015

During photooxidation of polycyclic aromatic hydrocarbons (PAH) products can be formed which develop chemiluminescence on treatment with bases. Flash photolysis experiments show that this is the case only after previous formation of cation radicals, e.g. in the presence of CCl4 as solvent or of e-acceptors in aprotic solvents. These radicals react with oxygen to peroxy-radicals which can combine to several kinds of peroxides. Primary and secondary peroxides are the sources of chemiluminescent activity.
Chemiluminescent peroxides can also be obtained by irradiation of PA H carbonyl com pounds in protic solvents under nitrogen. It is assumed that two excited CO groups combine exceptionally with their O-atom s thus creating a peroxide bond. 24 aromatic aldehydes, ketones, dicarboxylic acid anhydrides and coumarines develop chemiluminescence after illumination with wavelengths ≥ 320 nm with intensities varying 4 magnitudes of order.
The sensitivity of the photochemiluminescent method is sufficient to detect amounts of PA H and their CO derivatives in the ppb to ppm range.
In the Search for New Anticancer Drugs, XVI Selective Protection and Deprotection of Primary Amino Groups in Spermine, Spermidine and Other Polyamines
Authors: Sosnovsky George , Lukszo Jan 
Published: March 2015

Abstract
Spermidine, spermine and other polyamines 1-5 were selectively protected at the terminal primary amino functions without affecting the secondary amino groups using N-ethoxycarbonyl-phthalimide (15), the Nefkens’ reagent. Three representative products, 17, 18 and 20, readily underwent acylation at the secondary amino nitrogen to give the corresponding compounds 21-26. Selective deprotection of two representative samples 22 and 25 at the primary amino function by hydrazinolysis yielded the corresponding derivatives 27 and 28 with free primary amino groups.
In summary, the application of Nefkens’ reagent for the terminal protection of primary amino groups in various polyamines results in a simple, efficient and selective one-step procedure using commercially available reagents.
Molecular Determinants for Drug-Receptor Interactions. 6. Proton 500 MHz NMR Spectra of the Narcotic Antagonists Naloxone and Naltrexone by Two-Dimensional 1H–1H Chemical Shift Correlation Spectroscopy
Authors: Perly Bruno , Pappalardo Giuseppe C. , Grassi Antonio 
Published: March 2015

The full analysis of the 1H NMR spectra of naloxone and naltrexone (hydrochloride salts, in 2H2O solution) was performed by using an high-frequency (500 MHz) spectrometer and the recent technique of two-dimensional (2D ) homonuclear shift spectroscopy. The 1H-1H connectivities allowed detection of correlated resonances and assignments of multiplets. The shapes of the contour levels of the COSY 45 spectra were also used to check the relative signs of coupling constants. The refinement of spectral parameters of some component spin-systems of the complex spectra was performed by computerized iterative simulation of patterns.
The spectral analysis provided proton coupling constants that allowed to establish a slightly distorted-chair conformation of the piperidine ring in both compounds.
The magnetic non-equivalence found for the protons bonded to C-17 atom (part of the N-alkyl fragment) was found to be larger in naltrexone than in the analogous naloxone. This fact, while no significant differences were observable in the chemical shifts of corresponding protons of the rigid molecular backbone of the two narcotic antagonists under study, was assigned to smaller degree of internal conformational flexibility of the N-methylcyclopropyl group in naltrexone with respect to that of the N-methylallyl group in naloxone.
The above findings appeared in good agreement with our previously proposed views based on results from 13C relaxation times studies, which suggested the possible correlation of the motional rates of the N-methyl-R group to the pharmacological activity of antagonist compounds. This would consist in a direct correlation between decreasing flexibility of the N-bonded fragment and increasing antagonistic potency.
Synthesis of Pyranobenzopyranopyridines and Benzodipyran Derivatives
Authors: Hishmat O. H. , Khalil Kh. M. A. , El-Naem Sh. I. , el-Rahman A. H. Abd 
Published: March 2015

6-Formyl-7-hydroxy-5-methoxy-2-methylchromone on bromination yields the 8-bromo derivative or the 8-bromo-6-formyl-5,7-dihydroxy derivative depending on the reaction condition. Cyclization of both leads to the corresponding 3-acetyl-, 3-benzoyl-, 3-carboxamido-, 3-carbethoxybenzodipyran derivatives.
The 3-acetylbenzodipyran derivative when treated with ethyl acetoacetate or ethyl cyanoacetate in the presence of ammonium acetate yields the corresponding dihydropyranobenzopyranopyridine dione or the dihydropyranobenzopyranopyridine trione.
The reaction of the 3-acetyl derivative with cyanoacetamide in the presence of ammonium acetate affords the substituted pyranobenzopyranopyridine dione.
The 3-acetyl derivative undergoes self condensation to form the substituted benzopyranobenzopyran derivative.
Magnesiumorganische Innerkomplexe, Teil I [1] Bis(dialkylaminoalkyl)- und Bis(alkoxybutyl)magnesium-Verbindungen / Organomagnesium Inner Com plexes, Part I [1] Bis(dialkylaminoalkyl)- and Bis(alkoxybutyl)magnesium Compounds
Authors: Angermund Klaus , Bogdanović Borislav , Koppetsch Gudrun , Krüger Carl , Mynott Richard , Schwickardi Manfred , Tsay Yi-Hung 
Published: March 2015

A series of magnesium inner complexes has been prepared by reacting MgH2 (prepared by homogeneous catalysis) with dialkylallyl- and -3-butenylamines and -3-butenylethers in the presence of catalytic amounts of ZrCl4. The monomeric nature of bis(4-methoxybutyl)magnesium has been confirmed by X-ray diffraction.
The analogous syntheses of bis(3-alkoxypropyl)magnesium compounds failed: cleavage of the allyl ether with elimination of propene occurred. This cleavage reaction is accelerated by catalytic amounts of NiCl2 or ZrCl4
Reaktionen koordinierter Liganden, III [1]. Stabilisierung von Dimenthyldiphosphen und Menthylphosphiniden als Brückenliganden in Metallcarbonylkomplexen / Reaction of Coordinated Ligands, III [1]. Stabilization of Dim enthyldiphosphene and Menthylphosphinidene as Bridging Ligands in Metal Carbonyl Complexes
Authors: Hinke Anna-Margarete , Hinke Axel , Kuchen Wilhelm , Hönle Wolfgang 
Published: March 2015

Abstract
Reduction of MentPBr2M(CO)5 1 (M = Cr, W) with magnesium in THF yields the diphos­phene complex (CO)5M(Ment)P=P(Ment)M(CO)5 2 as the main product. In addition, a phosphinidene complex, (CO)5M(Ment)PM(CO)5 (3) is also formed. The latter is obtained in larger amounts, if the reaction is carried out in the presence of M(CO)5THF. The proposed structures are confirmed by NMR and UV data as well as - in the case of the chromium compounds (2a, 3a) - by crystal structure analysis. Compound 2a is obtained only as the frans-isomer. The P-P distance in 2a (204.0 pm) indicates a double bond which does not participate in the complex formation. The P-Cr distance in 3a (average: 230.3 pm) is within the low est range found for this element combination. Reaction of 2a with LiAlH4 yields the diphosphane complex (CO)5CrMent(H)P-P(H)MentCr(CO)5 4 as a mixture of “meso” and “rac” diastereomers.
Synthese, Molekül-und Kristallstruktur von 3,5-Dimethyl-2,6-bistrimethylsilyl- 1-thia-2,4,6-triaza-3,5-diborinan-wolframpentacarbonyl/ Synthesis, Molecular and Crystal Structure of 3,5-Dimethyl-2,6-bistrimethylsilyl- 1-thia-2,4,6-triaza-3,5-diborinane-tungstenpentacarbonyl
Authors: Habben Carl , Meller Anton , Noltemeyer Matthias , Sheldrick George M. 
Published: March 2015

Abstract
The am monolysis of 3,5-dim ethyl-2,6-bistrimethylsilyl-1,4-dithia-2,6-diaza-3,5-diborinane leads to 3,5-dim ethyl-2,6-bistrim ethylsilyl-1-thia-2,4,6-triaza-3,5-diborinane, which reacts with tungstenpentacarbonyl · TH F to give the title-com pound. 1H , 11B , 13C, 14N , 29Si NMR spectra, IR and MS data, and the results of an X-ray analysis are reported.
Brom- und Chlorthionitrenkomplexe des Rheniums. Die Kristallstruktur von (PPh4)2 [ReBr4(NS)(NSBr)]·CH2Br2 Bromo- and Chlorothionitrene Complexes of Rhenium The Crystal Structure of (PPh4)2[ReBr4(NS)(NSBr)]·CH2Br2
Authors: Hauck Hans-Günter , Willing Wolfgang , Müller Ulrich , Dehnicke Kurt 
Published: March 2015

Abstract
The thionitrosyl-halothionitrene com pounds (PPh4)2[ReX4(NS)(NSX)]·2 CH2X2, X = Cl or Br, are obtained by nucleophilic ring cleavage of the Re(N2S2) rings of complexes [ReX4(N2S2)]⊖ with PPh4X in CH2X2. (AsPh4)2[ReCl4(NS)(NSCl)] · CH2Cl2 can also be obtained by the reaction of [ReCl4(NSCl)(POCl3)] with S(NSiMe3)2 and subsequent addition of AsPh4Cl. The pyridine complex [ReBr2(NS)(NSBr)(NC5H5)2] · CH2Br2 forms by bromination of the corresponding chloro compound with Me3SiBr. The IR spectra are reported. The crystal structure of (PPh4)2[ReBr4(NS)(NSBr)] · CH2Br2 was determ ined by X-ray diffraction (4158 independent observed reflexions, R = 0.059). Crystal data: a = 1039.7, b - 1232.5, c - 2158.4 pm, α = 81.59, β = 87.05, γ = 77.06°, Z = 2, space group P1̄. The compound consists of PPh4
⊕ ions, CH2Br2 molecules, and anions [ReBr4(NS)(NSBr)]2⊖ in which the rhenium atoms are coordinated by four bromine atoms, one thionitrosyl and one brom othionitrene group. The latter have cis arrangement and ReN bond lengths of 186 pm. W hereas the thionitrosyl group is nearly linear, the R = N = SBr group has an ReNS angle of 165°.
Organoborierung von Alkinylstannanen, XVIII. Neue kondensierte heterocyclische Systeme aus N- und C-lithiierten Azolen und cis- 1,2-organometallisch substituierten Alkenen/ Organoboration of Alkynylstannanes, XVIII. Novel Fused Heterocyclic Systems from N- and C-Lithiated Azoles and cis-1,2-Organometallic Substituted Alkenes
Authors: Kerschl Susanna , Wrackmeyer Bernd 
Published: March 2015

Abstract
Organoboration of dimethyl(chloro)-1-propynylstannane with triethylborane gives (E̲)-2-dimethyl(chloro)stannyl-3-diethylboryl-pent-2-ene (2a) in high yield. Reactions of 2a with N- and C-lithiated azoles (pyrazole, 1-m ethylimidazole, 1-methyl-1,2,4-triazole) lead to the new fused heterocyclic systems 8, 10, 12. In the case of 10 and 12 it was possible to detect (by 11B, 119Sn NM R ) the isomers 9 and 11 which have a zwitterionic structure with an Sn-N linkage. After heating, the compounds 9 and 11 rearrange quantitatively into 10 and 12, respectively. These results show the com petition between boron and tin in 2a as electrophilic centres.
Studies on Heterocyclic Enamines: New Synthesis of Pyrano[2,3-b]pyndine, Pyrano[2,3-d]pyrimidine and Pyrano[2,3-c]pyrazole Derivatives
Authors: Abed Nosrat Mustafa , Ibrahim Nadia Sobhy , Elnagdi Mohamed Helmy 
Published: March 2015

Abstract
A variety of novel pyrano[2,3-d]pyrimidines could be obtained via reaction of ethyl 2-amino- 3-cyano-6-methylpyran-4-carboxylate with a variety of reagents. Evidence for the existance of this pyran derivative as a ring chain tautom er is presented.
Preparation and Crystal Structure of cis-Tetrachlorobis(cyclooctasulfurmonoxide)tin(IV)
Authors: Steudel Ralf , Steidel Jürgen , Sandow Torsten 
Published: March 2015

Abstract
Yellow crystals of cis-[SnCl4(S8 O)2] containing the homocyclic sulfur oxide S8O have been prepared from the com ponents in carbon disulfide at -35 °C. An X-ray structural analysis carried out at -105 °C showed the com pound to be monoclinic, space group P21/n with Z = 4 in a unit cell of dimensions a = 821.2(2) pm, b = 1331.9(4) pm , c = 2071.7(6) pm and β = 91.82(2)°. The structure was refined to a final agreement factor R = 0.038 for 2022 reflections. The tin atom is surrounded by a distorted octahedron of two oxygen atoms in cw-positions and four chlorine atoms in accordance with other oxygen-bonded complexes of SnCl4. The molecular symmetry is approximately C2, and the SS bond lengths in the ligands vary between 201 and 218 pm. Vibrational spectra of [SnCl4(S8O)2] are reported. The title compound is the second example containing S8O as a ligand.
Synthese und spektroskopische Charakterisierung von Metallocen-chloro-selenophenolaten / Synthesis and Spectroscopic Characterization of Metallocene Chloro Selenophenolates
Authors: Köpf Hartmut , Klapötke Thomas 
Published: March 2015

Abstract
Bis(/75-cyclopentadienyl)-chloro-selenophenolatotitanium (IV), Bis(?75-cyclopentadienyl)-chloro-selenophenolatozirconium (IV), Bis(//5-cyclopentadienyl)-chloro-selenophenolatohafnium (IV), Bis(^5-cyclopentadienyl)-chloro-selenophenolatotungsten(IV), Mass Spectra The metallocene chloro selenophenolates C p;M Cl(SeChH 5) (Cp = ^5-C5H 5; M = Ti, Z r, Hf, W) were prepared by reaction of Cp2MCl2 with equivalent am ounts of LiSeC6H 5, obtained from phenylselenol and «-butyllithium, and were characterized by 'H NM R, IR and MS data. The fragmentation behaviour of the Ti and W derivatives is elucidated by observing m etastable transi­ tions in the mass spectra.
Reaktive E =C (p—p)π-Systeme, X Darstellung und Reaktivität von Perfluor-3-phosphapent-2-en / Reactive E = C (p-p)π-Systems, X Preparation and Reactivity of Perfluoro-3-phosphapent-2-ene
Authors: Grobe Joseph , Szameitat Jürgen 
Published: March 2015

Abstract
Perfluoro-3-phosphapent-2-ene F5C2 P =C (F )CF3 (1) has been prepared for the first time by thermal elimination of trimethyltin fluoride Me3SnF from trim ethylstannyl-bis(pentafluoroethyl)- phosphane Me3SnP(C2F5) 2 at 300 °C/10−3 Torr. 1 is found to be less stable than F3CP = CF2 in dilute solution at room temperature, forming several 1,3-diphosphabutane dimers. Reactivity studies accomplished till now include (i) the dienophilicity of 1 in [2+4] cycloaddition reactions with butadiene, 2,3-dim ethylbutadiene, cyclopentadiene, 1,3-cyclohexadiene, 2-methylbutadiene, and 2-methylfuran leading by a concerted mechanism to the Diels-Alder-adducts 2-7 in about 80% yield, (ii) the addition of proton acidic compounds HX (X = OMe, Br, NMe2, NEt2) to the PC double bond affording chiral phosphanes of the type F5C2 P(X)CF(CF3)H [X = OMe (8). Br (9). NMe2 (10). NEt2 (11)]. thus proving a stronger polarity δ+P =δ−C for 1 than for F3CP = CF2. New compounds have been characterized by NMR and MS measurements.
Chemie der Isoblausäure, II Reaktionen von [M(CO)5CNH] (M = Cr, Mo, W) mit Aziridinen: Zyklische Diaminocarbenkomplexe / Chemistry of Hydrogen Isocyanide, II Reactions of [M(CO)5CNH] (M = Cr, Mo, W) with Aziridines: Cyclic Diaminocarbene Complexes
Authors: Fehlhammer Wolf Peter , Bär Eberhard , Boyadjiev Borislav 
Published: March 2015

Abstract
The hydrogen isocyanide complexes [M (CO)5CNH] (M = Cr, Mo, W) have been treated with the aziridines R [xxx] H2 (R = H, R’ = H, Me, Et; R = Me, R’ = H) to give imidazolidin-2-ylidene complexes. The same type of ligand forms on addition of aziridine to the electrophilic isocyanide group in [FpCNPh]+ in the presence of Br−, IR, 1H NMR, 13C NMR and mass spectra of the new compounds are reported.