bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ein Ylidkomplex des Rutheniums mit drei-und viergliedrigen Metallocyclen / An Ylide Complex of Ruthenium with Three-and Four-Membered Metallocycles
Authors: Schmidbaur H. , Blaschke G. 
Published: February 2015

Abstract
A spirometallocyclic complex of ruthenium with (CH3)2P(CH2)2, (CH3)2PCH2 and two (CH3)3P ligands (formula 5) is synthesized from (CH3)2P(CH2)2Li and trans-[(CH3)3P]4RuCl2 in the molar ratio 2:1. Two equivalents of (CH3)3P are liberated and the ionic complex trans-[(CH3)3P]4Ru[CH2P(CH3)3]Cl +Cl- is formed as a by-product. The products were characterized by analytical and spectroscopic data.
Semicobaltate -Alkalimetall-Träger in Kohlenwasserstoffen Darstellung, Eigenschaften und Struktur von K[Co(C2H4)(PMe3)3]2 / Semicobaltates -Alkali Metal Carriers in Hydrocarbons Synthesis, Properties, and Structure of K[Co(C2H4)(PMe3)3]2
Authors: Klein Hans-Friedrich , Groß Joachim , Bassett Jean-Marie , Schubert Ulrich 
Published: February 2015

Abstract
Semicobaltates (Co-1/2) containing olefin and trimethylphosphane ligands are synthe-sized from Co(olefin)(PMe3)3 and potassium metal. The X-ray crystal structure determination of the title compound shows that the unit cell contains two K atoms in equal ionic contact with the ethylene ligands of four Co(C2H4)(PMe3)3 complex units, two of which are interacting with both K atoms.
In solution the semicobaltates exist in hydrocarbon solvents under argon only, while in contrast under ethylene or nitrogen atmospheres or in donor solvents disproportionation occurs to give Co(O) and Co(-I) species. Allgemeines
Chlor-Isotopenseparation an einem wasserhaltigen Zirkondioxidaustauscher / Chlorine Isotope Separation Using an Hydrous Zirconium Dioxide Exchanger
Authors: Heumann Klaus G. , Baier Klaus , Wibmer Gerald 
Published: February 2015

Abstract
Hydrous zirconium dioxide is used in column experiments for separating the halide ions as well as for isotope fractionation of chlorine. The preparation of the zirconium dioxide particles is carried out by homogeneous hydrolysis of a zirconyl chloride solution using hexamethylenetetramine. The separation order of the halides is I-, Br- and Cl- in contrast to the inverse separation order using a strongly basic anion exchange resin. In chlorine isotope separation experiments an enrichment of 35Cl- is found in the first fractions, whereas the last fractions show a significant enrichment of 37C1-. This also indicates an inversion of the isotope separation compared with a strongly basic anion exchange resin. A dependence of the isotope fractionation on the concentration of the NaNO3 solution used as eluant is found. With increasing concentration the isotope fractionation decreases. Using a 0.5 M NaNO3 solution the elementary separation effect was calculated e = 6,1 · 10-4 . This is one of the highest isotope fractionations known in a chloride isotope exchange system. The results show that the electrolyte behaviour of isotopes is comparable to that of a series of homologous elements.
Über das Bis(chlorschwefel)sticktoff-Kation N(SCl)2
+/On the Bis(chlorosulfur)nitrogen Cation N(SCl)2
+
Authors: Glemser Oskar , Kindler Eckehard , Krebs Bernt , Mews Rüdiger , Schnepel Frank-Michael , Wegener Joachim 
Published: February 2015

Abstract
The synthesis of N(SCl)2
+ MF6
- (M = As, Sb) is reported, the structure of N(SCl)2
+ AlCL4
- is determined and some of the spectroscopic properties of the N(SCl)2
+ cation are discussed.
Nonenzymatic Catalysis by Metal Ions and Phosphoric Acid Esters of Hydroxamic Acid Formation
Authors: Saygin Oemer , Decker Peter 
Published: February 2015

Abstract
Nonenzymatic catalysis by bivalent ions of Be, Mg, Ca, Zn, Mn, Ni and Co and bioorganic phosphates of the formation of hydroxamic acids from acetate or amino acids has been studied systematically. Increased yields of hydroxamate were observed at particular combinations of reactants. The most prominent increase (ca. 15-fold) was found with acetate and Ni++, and with a combination of ATP and Be++. Among others especially ribose-5-phosphate and glucose-5-phosphate enhanced yields in the presence of most metal ions. Since no release of inorganic phosphate was observed, this effect cannot be interpreted as an evidence for intermediate transhosphorylation reactions; it may also result from simple catalytic effects of metal sugar complexes.
Singlet Oxygen Production Photosensitized by Fluorescein in Reversed Micellar Solutions
Authors: Miyoshi Norio , Tomita Giiti 
Published: February 2015

Abstract
The quantum yield of singlet oxygen production was investigated in dodecylammonium propionate reversed micellar solutions containing 1,3-diphenylisobenzofuran and fluo-rescein as photosensitizer. The quantum yield was highly enhanced by the binding of fluorescein to reversed micelles, and increased with decreasing the solubilized water content in reversed micelles. Results obtained was discussed with the optical properties of fluorescein (absorption, fluorescence and phosphorescence) in reversed micellar solutions.
Buffer Action of Reversed Micelles
Authors: Miyoshi Norio , Tomita Giiti 
Published: February 2015

Abstract
The optical properties (absorption and fluorescence) of fluorescein sodium were investi-gated with changing the bulk pH value in aqueous, water-methanol mixed and dodecyl-ammonium propionate reversed micellar solutions. A strong buffer action was found in the reversed micellar solutions. The pKa values for the equilibrium between fluorescein mono-and di-anions in the ground and excited singlet states highly decreased in the reversed micellar solutions compared with those in non-micellar solutions. The micellar buffer action strongly affected the initial rate of the 1,3-diphenylisobenzofuran oxidation caused by the photosensitization of fluorescein. The buffer action was closely related to the solubilized water content.
Pyrroloquinolines, Part III [1] Synthesis of lH-Pyrrolo(2,3-b)quinolines
Authors: Murugesan M. , Ramasamy K. , Shanmugam P. 
Published: February 2015

Abstract
A new route to synthesis of pyrrolo(2,3-b)quinolines is described based on the use of 2-chloro-3-vinylquinolines as well as 2-chloro-3-(1ʹ,2ʹ-dibromoethyl)quinolines.
Notizen: Über zwei Bleiantimonphosphate mit Eulytinstruktur: Pb3SbIII(PO4)3 und Pb11SbV(PO4)9/On two Lead Antimony Phosphates with Eulytine Structure: Pb3SbIII(PO4)3 and Pb11SbV(PO4)9
Authors: Engel Günter , Belgardt Jutta 
Published: February 2015

Abstract
Two lead antimony phosphates have been prepared, which both crystallize with the cubic eulytine structure. Pb3SbIII(PO4)3 has the lattice constant a= 1037.2 pm and Pb11SbV(PO4)9 has a = 1037.5 pm. The X-ray diffraction diagrams appear nearly identical. In their chemical and thermal behaviour these compounds differ in a characteristic manner, however. The relatively large cell volume of Pb3Sb(PO4)3 is attributed to the very distinct stereochemical activity of the lone electron pair of Sb3+.
Notizen: Synthese und Struktur von Bis(dimethylgallinm)N.Nʹ-dimethyldithio-oxamid/Preparation and Structure of Bis (dimethylgallium )N ,Nʹ-dimethyldithio-oxamide
Authors: Haider Tilman , Hausen Hans-Dieter , Weidlein Johann 
Published: February 2015

Abstract
Monomeric Bis(dimethylgallium)N,Nʹdimethyldithiooxamide has been prepared by the reaction of Ga(CH3)3 and [HN(CH3)C(=S)-]2 in a 2:1 molar ratio. Two configurational isomers are formed and according to the 1H NMR and vibrational spectra both forms of these molecule consist of two fused five-membered rings, with an almost planar structure. The preliminary results of the X-ray structure determination are given.
Notizen: On the Role of the Electronic Bulk Properties of Semiconducting Minerals in their Interaction with Electrolytes
Authors: Kunze O. A. 
Published: February 2015

Abstract
The presence of small amounts of copper in galena-electrolyte systems leads to similar effects as those which can be ascribed to variations in the bulk electronic properties of semiconducting minerals. It is shown how trace amounts of copper can influence reproducibly the dissolution rate, the electrical polarizability and the rest potential of galena.
AB2X2 - Verbindungen im CaAl2Si2-Typ, VII [1] Zur Struktur der Verbindungen SrZn2As2, SrCd2As2 und YbMnCuP2 / AB2X2 Compounds with the CaAl2Si2 Structure, VII [1] The Crystal Structure of SrZn2As2, SrCd2As2, and YbMnCuP2
Authors: Mewis Albrecht 
Published: February 2015

Abstract
The compounds SrZn2As2, SrCd2As2, and YbMnCuP2 have been prepared and their structures determined. They are isotypic and crystallize trigonally in a CaAl2Si2-type structure (space group P3̄m 1) with the lattice constants:
SrZn2As2 a = 422,3(1) pm, c = 726,8(1) pm,
SrCd2As2
a = 445,2(1) pm, c = 741,6(1) pm,
YbMnCuP2 a = 394,9(1) pm, c = 648,4(1) pm.
Darstellung und Struktur der Verbindung CaCu4P2 / Preparation and Crystal Structure of CaCu4P2
Authors: Mewis Albrecht 
Published: February 2015

Abstract
of the system Ca-Cu-P resulted in the discovery of CaCu4P2. The compound crystallizes in a trigonal-rhombohedral structure (hexagonal axes: a = 403.6(1) pm, c = 2227.2(2) pm; space group R3̄m) which contains structural elements of the compound CU3P.
Mineralization of CCl4 and CCl2F2 on Solid Surfaces
Authors: Gäb Siegmar , Schmitzer Johannes , Turner Walter V. , Korte Friedhelm 
Published: February 2015

Abstract
The mineralization of 14CCl4 and 14CCl2F2 in the dark is shown to be greatly dependent on the nature of the solid surfaces to which they are exposed, alumina being more effective than silica gel and a number of natural sands. Activation of the solids by drying or mechanically by tumbling leads to increased mineralization rates.
(MePNMe)4S3, ein Cyclotetra(λ3,λ5,λ5,λ5-phosphazan) / (MePNMe)4S3, a Cyclotetra(λ3,λ5,λ5,λ5-phosphazan)
Authors: Zeiß Werner , Schwarz Wolfgang , Hess Heinz 
Published: February 2015

Abstract
Octamethylcyclotetra(λ3-phosphazane) (1) reacts with three mole equivalents of sulfur, added either in excess or in deficite, to give 2, the first cyclotetra(λ3,λ5,λ5,λ5-phosphazane). Its crystal structure determination shows a completely unsymmetrical molecule, which does not undergo ring inversion in solution. Thus an ABMX spin system with remarkably different AM and BM coupling constants is observed in the 31P{1H} NMR spectrum. By means of selective {31P} decoupling, all CH3 proton signals could be assigned in the 1H NMR spectrum.
Structures of 1-Phenyl-3-methyl-pyrazolone-5 and its Benzoyl Derivatives+
Authors: Okafor Emmanuel Chukwuemeka 
Published: February 2015

Abstract
The structures of 1-phenyl-3-methyl-pyrazolone-5 and its benzoyl derivatives have been investigated by means of IR, UV, NMR, and mass spectral spectroscopy. 1-Phenyl - 3-methyl-pyrazolone-5 is found to exist as a zwitter ion in the solid state, in the 5-keto form in chloroform and dioxane, and in the 5-hydroxy form in pyridine. The 4-benzoyl derivative of 1-phenyl-3-methyl-pyrazolone-5 is shown to exist in two different tautomeric enol forms and not an enol form and a keto form as was formerly reported. The structures of two other benzoyl derivatives were investigated and assigned as the C-5-O-benzoyl derivative and C-4-benzoyl-C-5-O-benzoyl derivative, respectively.
Electrophilic Substitution of Aromatic Compounds by Unsaturated Sugar Derivatives
Authors: Grynkiewicz Grzegorz , Zamojski Aleksander 
Published: February 2015

Abstract
Hexenopyranosyl Carbocations, Pent-2-enopyranos-4-ulosyl Carbocations Glycals 1 and 2 react with methoxybenzene in the presence of SnCLj forming ^-substi-tuted C-glycosyl compounds 4 and 5 + 6 respectively. Under similar conditions 1-O-benzoyl-or methyl pent-2-enopyranos-4-uloses (7) and (8) react with electron rich aromatic compounds furnishing either C-glycosyl compounds or C-2 aryl substituted products depending on the nature of the aromatic component as well as the kind of substituent at C-1.
The Crystal Structures of U2Cu3 Al and UCUAl2, and their Relationship with Some Other Phases in the System U-Cu-Al
Authors: Blažina Ž. , Ban Z. 
Published: February 2015

X-ray investigations of a great number of samples along the specifically chosen tie-lines in the isothermal sections of the system U-Cu-Al (800 °C) indicated the existence of two new ordered ternary phases, i.e. U2Cu3Al and UCuAl2.
The first one is hexagonal (S. G. P63/mmc, MgZn2-type), with a = 5.065 ± 0.005 Å, c = 8.307 ± 0.005 Å and c/a = 1.640. The ordered atomic arrangement of all atoms, as confirmed by trial and error method is consistent with a rather uncommon superstructure of the MgZn2-type.
UCuAl2 is tetragonal, a = 3.857 ± 0.005 A, c = 8.736 ± 0.005 A, c/a = 2.265, probable space group is I4/mmm, and represents an ordered ternary structure variant of the TiAl3 type.
The crystal structures of these two new phases were correlated, in terms of stacking sequences, with those which were identified in this system previously.
Dodecamethyl Bisimidotriphosphoramide (TRIPA), Part III [1, 2] The Crystal and Molecular Structure of TRIPA · H2O
Authors: Lapidaire Johannes C. P. M. , De Kok Anthoni J. 
Published: February 2015

Abstract
The crystal and molecular structure of dodecamethyl bisimidotriphosphoramide mono-hydrate (TRIPA • H2O, C12H38N7O4P3) has been determined by single crystal X-ray diffraction techniques. The compound crystallises in the monoclinic system, space group P2i/n with a = 9.236(3), b = 14.016(4), c = 17.534(5) A, β = 97.32(4)°, Z = 4. The building units are dimers of TRIPA • H2O. These units are separated by normal van der Waals distances. The two molecules in the dimer are connected by four hydrogen bridges involving two water molecules. The nitrogen atoms display a nearly planar hybridisation.
Übergangsmetall-substituierte Phosphane, Arsane und Slibane, XXIV [1] Funktionelle Arsanliganden durch Reaktion von Übergangsmetalldimethylarsinsulfiden mit Aeetylhalogenid [2] / Transition Metal Substituted Phosphanes, Arsanes and Stibanes, XXIV [1] Functional Arsane Ligands via Reaction of Transition Metal-Dimethylarsinesulfides with Acetylhalide [2]
Authors: Janta Reinhard , Malisch Wolfgang 
Published: February 2015

Abstract
The interaction of the transition metal dimethylarsine sulfides Cp(CO)2PMe3M-As(S)Me2 (M = Mo, W) with acetylhalides yields cationic complexes bearing the Me2AsSC(O)Me or Me2AsCl(Br) ligand, respectively. In a first step, the salt [Cp(CO)2PMe3M-AsMe2SC(O)Me]⊕X⊖ 1a-c (X = Cl, Br) is formed, which is converted by a second mole MeC(O)X into salts [Cp(CO)2PMe3M-AsMe2X]⊕X⊖ 2a-c, with (Me2CO)2S elimination. The brominated complex 2b can also be obtained by the addition of Br2 to Cp(CO)2PMe3W-AsMe2. The composition and structure of the ionic dihalogen adducts are established by NMR and IR data and by conductivity measurements.
Strukturisomere von Kupfer(I)iodid · Pyridin und ihre Lumineszenzeigenschaften. Darstellung und Kristallstruktur einer neuen Modifikation von Cul · NC5H5 / Structural Isomers of Copper(I) Iodide Pyridine and their Luminescence Properties Synthesis and Crystal Structure of a New Modification of Cul · NC5H5
Authors: Eitel Erika , Oelkrug Dieter , Hiller Wolfgang , Strähle Joachim 
Published: February 2015

Abstract
A new modification of CuI · py was prepared by the reaction of a saturated solution of CuI in CH3CN with a solution of pyridine in ethanol at 60 °C. It crystallizes monoclinic with four formula units in the space group P21/c. (CuI · py)∞ forms a polymeric ribbon structure. Contrary to the cubane-like tetrameric modification, (CuI · py)∞ does not show luminescence thermochromism. The luminescence properties of both modifications of Cul · py are interpreted.
Bis(η5-cyclopentacüenyl)N,N-Disiibstituted Dithiocarbamato(chloro)oxomolybdeniim(VI) Complexes
Authors: Sangari H. S. , Sodhi G. S. , Kaushik N. K. , Singh R. P. 
Published: February 2015

Abstract
Bis(η5-cyclopentadienyl)N,N-disubstituted dithiocarbamato(chloro)oxomolybdenum(VI) complexes of the type (C5H5)2MoO(S2CNR2)Cl and (C5H5)2MoO(S2CNRR′)Cl where R = Me, Et, i-Pr and R′ = cyclohexyl (cyhx) have been prepared by the reaction of stoichio­metric amounts of bis(η5-cyclopentadienyl)oxomolybderium(VI) dichloride with sodium dithiocarbamates in refluxing dichloromethane. Infrared spectral studies demonstrate that in these complexes, the dithiocarbamate ligands are bidentate. Hence a coordination number of 7 may be assigned to the molybdenum(VI) atom in each case. In addition to infrared studies, electronic spectra, NMR studies, magnetic susceptibility, elemental an­alyses and conductance measurements have been carried out for these complexes.
Electronic and Resonance Raman Spectra of the Linear Chain Mixed Valence Compound Pt(NH3)2(SCN)2I
Authors: Clark Robin J. H. , Kurmoo Mohamedally , Buse K. D. , Keller H. J. 
Published: February 2015

Abstract
The partially oxidized cis-Pt(NH3)2(SCN)2I has been studied by resonance Raman spectroscopy. A progression in the symmetric I-PtIV-I vibration (v1 = 120.1 cm-1), reaching as far as 8 v1, has been observed. The compound Pt(NH3)2(SCN)2I could be identified as a mixed valence solid with neutral, linear PtII···I-PtIV chains.
The Synthesis of Organometallic YlidesInteraction of Methylenetriphenylphosphorane with Bis(η5-cyclopentadienyl)-zirconium and -hafnium Dichlorides and the Molecular Structure of Bis(η5 -Cyclopentadienyl)chlorozirconylmethylenetriphenylphosphorane
Authors: Baldwin James C. , Keder N. L. , Strouse Charles E. , Kaska William C. 
Published: February 2015

Abstract
The interaction of (η5-C5H5)2MCl2 (M = Zr, Hf) with excess C̅H2-P⁺Ph3 in THF gives (η5-C5H5)2MCl(C̅H-P⁺Ph3) as yellow orange needles. Nuclear magnetic resonance spectra show hindered rotation about the P⁺-C̅ bond with ⊿G≠= 8.6 kcal/mole for M = Zr and 8.3 kcal/mole for M - Hf, respectively. The X-ray molecular structure of the zirconium complex shows a relatively short Zr-C bond length of 2.152 Å and a long P⁺-C̅ bond length of 1.716 Å.
Darstellung und Struktur der Verbindungen PrLi2P2, PrLi2As2 und NdLi2As2 / Preparation and Crystal Structure of PrLi2P2, PrLi2As2 and NdLi2As2
Authors: Fischer Herrad-Odilia , Schuster Hans-Uwe 
Published: February 2015

Abstract
Three ternary compounds PrLi2P2, PrLi2As2 and NdLi2As2 have been prepared and investigated by X-ray methods. They are isotypic and crystallize trigonally in the CaAl2Si2-structure (Space group P3̅m1-D3d
3) with the follow-ing cell parameters:
PrLi2P2: a = 419.6 pm, c = 682.1 pm;
PrLi2As2: a = 429.9 pm, c = 696.0 pm;
NdLi2As2: a = 428.7 pm, c = 692.2 pm.
Kationische Rhenium-pentacarbonyl- Komplexe mit Sauerstoff-σ-Liganden / Cationic Rhenium-pentacarbonyl Complexes with Oxygen-σ Ligands
Authors: Oltmanns Melle , Mews Rüdiger 
Published: February 2015

Abstract
From [Re(CO)5SO2]+AsF6
- or Re(CO)5FAsF5 and oxygen-σ-donors D (D = H2O, CH3OH, (CH3)2CO) the complexes [Re(CO)5D]+AsF6
- are formed in quantitative yield. The spectroscopic properties of the cations are reported.
Darstellung von (Trimethylsilylmetliyl)gallium-Verbindungen / Preparation of (Trimethylsilylmethyl)gallium Compounds
Authors: Fuhrmann Klaus-Dieter , Huber Friedo 
Published: February 2015

Abstract
(Me3SiCH2)3Ga, a monomer in benzene solution and a rather weak Lewis acid, was prepared from GaCl3 and Me3SiCH2MgCl in Et2O (Me = CH3, Et = C2H5). Et2GaCH2I, obtained from Et2GaI and CH2N2, reacts with Me3SiMgCl in Et2O to give a solution of Et2GaCH2SiMe3. This compound and PPh3 form the more stable complex Et2GaCH2SiMe3 · PPh3 (Ph = C6H5), which can be isolated.
Dynamisches Verhalten, Konformation und Bindungsverhältnisse von Enaminosulfoniumsalzen / Dynamic Behaviour, Conformation and Bonding of Enaminosulfonium Salts
Authors: Firl Joachim , Braun Heinz , Amann Anton , Barnert Robert 
Published: February 2015

Abstract
The rotational barriers about the C-N single bond of the enaminosulfonium salts 1-6 are measured. Their magnitudes are related to the π-donor strength of the NR2 group. For the unsymmetrically substituted compounds 7-12 the rotational equilibria are determined. In the case of the monoalkyl compounds 7-10 the more crowded s-cis-rotamers turn out to be the more stable conformations. Furthermore, the 13C chemical shifts of the sulfonium salts 1-16 are reported. The shift differences δ(s-cis-s-trans) for the α-carbons of the N-alkyl groups seem to depend on the dihedral angle between the vinyl group and the C-H(α-c) bonds. Moreover, the spectra reveal that enaminosulfonium salts posses a high degree of ylide character.
Salts of Ferricinium Cation and its Homologues: NMR Investigation, II EPR and NMR Spectra of sym-Polymethyl Substituted Ferricinium Cations
Authors: Materikova R. B. , Babin V. N. , Solodovnikov S. P. , Lyatifov I. R. , Petrovsky P. V. , Fedin E. I. 
Published: February 2015

Abstract
The EPR, 1H and 13C NMR spectra of methylferricinium hexafluorophosphates, [(MenCp)2Fe]PF6, n = 0-5, have been recorded. HFS constants have been estimated for all the ligand atoms. The general pattern of the spin density distribution is shown to depend on the superposition of the various mechanisms of spin delocalization. For the majority of the cations the determining factors has been found to be represented by spin polarization over the π-skeleton.
Untersuchungen an quartären Pyridinium-Salzen, XIII [1] Reaktion von Carbonsäureamiden mit Pseudobasen der Pyridinreihe / Investigations of Quaternary Pyridinium Salts, XIII [1] Reaction of Carboxamides with Pseudobases from Pyridine Derivatives
Authors: Gündel Wolf-H. 
Published: February 2015

Abstract
Pyridinium salts react in aqueous solution to pseudobases, which give on addition of carboxamides N-(1,4-Dihydro-4-pyridyl)-carboxamides.
The Chemical Evolution of a Nitrogenase Model, XIX Simulation of the Enzymatic Reduction of Cyclopropene
Authors: Schrauzer Gerhard N. , Hughes Laura A. , Palmer Miles R. , Strampach Norman , Grate Jay W. 
Published: February 2015

Abstract
The nonenzymatic reduction of cyclopropene in molybdothiol-and related model systems of nitrogenase yields cyclopropane and propylene in a pH-dependent fashion: In alkaline media, cyclopropane is formed exclusively. In acidic solutions, cyclopropane and propylene are produced. Cyclopropene is thus identified as a pH sensitive chemical probe of nitrogenase. Since substantial amounts of propylene are formed in the enzymatic reduction of cyclopropene, it follows that the active site in functioning nitrogenase is in a locally acidic environment. The protons required to sustain the acidic pH are presumably generated by ATP hydrolysis; addition of substrate amounts of ATP to nonenzymatic cyclopropene reducing systems also stimulates propylene-and cyclopropane production. The stereochemical course of cyclopropene reduction to cyclopropane is exclusively cis, both under enzymatic and nonenzymatic conditions. The formation of propylene from cyclopropene is not stereoselective and mechanistically consistent with acid catalyzed ring opening prior to reduction.
1,2-Dimethoxy-4-isopropoxy-5-vinylbenzene, an Insect anti-Juvenile Hormone Lacking the Chromene Ring
Authors: Matolcsy G. , Darwish Y. M. , Bélai I. , Varjas L. , Farag A. I. 
Published: February 2015

Abstract
The chromene derivative precocene II (1) induces precocious metamorphosis and sterility on some insects, while β-asarone (2), which does not contain a chromene ring, reveales sterilant action without causing developmental disturbances. Based on the common structural features of these two substances, some of their analogues containing their structural elements have been prepared and tested on the cotton bug, Dysdercus cingulatus to investigate structural requirements of activity. The title compound 3 lacking the chromene ring induced symptoms similar to those of precocene II, indicating that the chromene ring structure is not necessary for this action.
Alkaloide in Tabernaemontana-Arten, XIII [1] Ibophyllidin und Ibophyllidin-Nb-oxid, Alkaloide in Tabernaemontana flavicans / Alkaloids in Tabernaemontana-Species, XIII [1] Ibophyllidine and Ibophyllidine-Nb-oxide, Alkaloids in Tabernaemontana flavicans
Authors: Achenbach Hans , Raffelsberger Bernd 
Published: February 2015

Abstract
From the basic extract of Tabernaemontana flavicans we isolated the alkaloids 1 and 2 and deduced their structures. Both compounds belong to the relatively rare group of 21-norpandolane type alkaloids.