bluuebunny/crossref_metadata_2025_split huggingface dataset:
Darstellung und Struktur des Bicyclo-[4.4.0]-1.4.6.9-tetraazadecans C6H14N4 Preparation and Structure of Bicyclo-[4,4,0]-l,4,6,9-tetraazadecane C6H14N4
Authors: May Wolfgang , von Schnering Hans Georg 
Published: February 2015

Abstract
By the weak acid interaction of polymeric phosphanes the condensation of ethylendi-amine yields in a small amount bicyclo-[4,4,0]-1,4,6,9-tetraazadecane C6H14N4. The compound crystallizes triclinic in the space group P1̅ with a = 841.6 pm, b - 463.6 pm, c = 529.2 pm, a= 109.05°, β= 108.35°, γ = 84.13° and Z= 1 formula unit per unit cell. The two condensed six-membered rings have chair conformations. The mean N-C bond lengths are 146.0 pm, the bridging C-C bond is 150.3 pm, whereas the other C-C bonds are 155.1 pm. Structure and condensation reaction are discussed.
Umsetzungen von Metall-und Metalloidverbindungen mit mehrfunktionellen Molekülen, XVIII [1] Synthese von Amidinoborazinen / Reactions of Metal and Metalloid Compounds with Polyfunctional Molecules, XVIII [1] Synthesis of Amidinoborazines
Authors: Meiler Anton , Maringgele Walter , Kablau Klaus-Dieter 
Published: February 2015

Abstract
The reaction of trimethylsilylamidines with 2-chloro-1,3,4,5,6-pentamethylborazine leads to the corresponding amidinoborazines and chlorotrimethylsilane. 1H, 11B, 11F NMR spectra, mass spectra and characteristic IR group frequencies are reported.
Beiträge zur Chemie der Pyrrolpigmente, XXIII [1] Die Struktur eines Bilatrien-abc-Derivates im gelösten Zustande / On the Chemistry of Pyrrole Pigments, XXIII [1] The Structure of a Bilatriene-abc Derivative in the State of Solution
Authors: Falk Heinz , Grubmayr Karl , Thirring Klaus 
Published: February 2015

Abstract
The (Z,Z,Z)-configuration of the mono-lactim-ether of an alkyl substituted bilatriene-abc, Etiobiliverdin-IV-γ, was established for chloroform solutions. Moreover the conformation of this molecule is a helical one (syn-syn-syn) with a twist along the single bonds at the methine groups of approximately 20°. The two tautomeric lactam-forms with a proton on one or the other nitrogen atom of the pyrromethene subsystem are indistin-guishable by the methods used in this investigation: 1H NMR pattern, Lanthanide induced shift technique and Nuclear Overhauser Effect measurements.
Photolysis (λ 185 nm) of Liquid Tetrahydropyran
Authors: Schuchmann Heinz-Peter , Naderwitz Peter , Sonntag Clemens von , Schuchmann Heinz-Peter , Naderwitz Peter , Sonntag Clemens von 
Published: February 2015

Abstract
The main products of the 185 nm photolysis of neat liquid tetrahydropyran are pent-4-en-l-ol (7) (∅ = 0.40), 2-(5′-hydroxypentyl)tetrahydropyran (10) (0.21), valeraldehyde (6) (0.13), and pentan-1-ol (8) (0.08). These products are thought to be formed via the biradical ·O(CH2)4ĊH2 and/or through intramolecular (6, 7, 8) and intermolecular (10) photoreactions. In the case of 10, the probability of a specific intermolecular photoreaction involving two tetrahydropyran molecules is suggested by the fact that in the photolysis of solutions of tetrahydropyran in cyclohexane and formaldehyde dimethyl acetal products analogous to 10 made up of a tetrahydropyran and a solvent molecule moiety, are not formed.
Darstellung und Charakterisierung von Tetraalkylammonium-lithiumphthaloeyaninen / Preparation and Characterisation of Tetraalkylammonium-lithium-phthalocyanines
Authors: Homborg H. , Kalz W. 
Published: February 2015

The preparation of some tetraalkylammonium-lithium-phthalocyanines is described. In contrast to the known dilithium-phthalocyanine these quarternary “onium”-salts are, dependent on the size of the alkyl groups, soluble in non-polar, aprotic solvents. The electronic spectra are investigated as a film on a quartz disk at 10 K. Under these conditions a large number of narrow bands is observed instead of the normally diffuse ones.
Solid state resonance Raman spectra were studied at 85 K by a method involving spinning KBr disks. It is shown that nearly all the lines are as a rule very sensitive to excitation conditions. The vibrational spectra are compared with the structural features of the compounds.
ABX-Verbindungen mit Ni2In-Struktur Darstellung und Struktur der Verbindungen CaCuP(As), SrCuP(As), SrAgP(As) und EuCuAs / ABX Compounds with the Structure Ni2In Preparation and Crystal Structure of CaCuP(As), SrCuP(As), SrAgP(As), and EuCuAs
Authors: Mewis Albrecht 
Published: February 2015

The compounds CaCuP(As), SrCuP(As), SrAgP(As) and EuCuAs were prepared and investigated by X-ray methods. They are isotypic and crystallize in a modified Ni2In structure (space group P 63/mmc-D6h
1) with the lattice constants:
CaCuP a = 405.5(1) pm, c = 780.3(3) pm,
CaCuAs a = 418.4(1) pm, c = 786.8(2) pm,
SrCuP a = 414.6(1) pm, c = 837.6(3) pm,
SrCuAs a = 427.3(2) pm, c = 845.2(3) pm,
EuCuAs a = 425.4(2) pm, c = 827.4(3) pm,
SrAgP a = 440.9(1) pm, c = 823.0(3) pm,
SrAgAs a = 452.9(1) pm, c = 829.1(2) pm.
Über die Chemie der Oberfläche des Titandioxids, V Die Oberflächenacidität von Titandioxid und von mit Phosphationen belegtem Titandioxid /On the Chemistry of the Surface of Titaniumoxide, V Surface Acidity of Titanium Dioxide and of Titanium Dioxide Covered with Adsorbed Phosphate Ions
Authors: Cornejo J. , Steinle J. , Boehm H. P. 
Published: February 2015

Abstract
The acidity of surface OH groups on TiO2 (anatase and rutile) was determined using the Benesi titration technique. The most acidic groups have acidity constants (Ho) between 3 and 5. On treatment with solutions of phosphoric acid or phosphates, H2PO4 -ions are adsorbed by ion exchange for basic OH -ions of the surface. The chemisorbed H2PO4 -ions react strongly acidic with an acidity constant Ho between -5.6 and -3.3. Possible reasons for this extreme increase in acidity are briefly discussed.
(CO)5CrFe2(CO)6PPh, ein tetraedrischer Cluster mit achtfach koordiniertem Chrom(O)/ (CO)5CrFe2(CO)6PPh, a Tetrahedral Cluster Containing an Eightfold Coordinated Chromium(O)
Authors: Huttner G. , Mohr G. , Friedrich P. 
Published: February 2015

Abstract
The title compound may be prepared by irradiation of (CO)5CrFe2(CO)8PPh, which itself is accessible from Fe2(CO)9 and (CO)5CrPPhCl2. It forms a tetrahedral cluster in which a pentacarbonylchromium fragment acts as the apex of a tetrahedron the base of which ist formed by an Fe2P-triangle. X-ray analysis reveals that the chromium atom interacts strongly with all three atoms of the tetrahedral base, thus substantiating a coordination number of eight for Cr(O).
Eine Bleidioxid-Bezugselektrode /A Lead Dioxide Reference Electrode
Authors: Wabner Dietrich , Hindelang Fritz , Huss Rainer 
Published: February 2015

Abstract
For research work in nitric acid and during the deposition of lead dioxide from nitric baths a reference electrode has proven its value, which consists of a lead dioxide layer on a titanium carrier. Its potential against n.h.e. lies at 1.455 + 0.002 V in 1 N Pb(NO3)2 + 0.1 N HNO3 at 295 K. This space-saving electrode can be used in the same electrolyte. It is stable against temperature variations and electronic control currents.
Untersuchungen an Stickstoff-Iod-Verbindungen, XVII [1]. Weitere tertiäre N-Basen als Stabilisatoren des Iodonium-Kations und der Iodhalogenide / Studies on Nitrogen-Iodine Compounds, XVII [1]. Further Tertiary N-Bases as Stabilizers of the Iodonium Cation and Iodine Halides
Authors: Jander Jochen , Maurer Alexander 
Published: February 2015

Abstract
The preparation and properties of the new compounds [I(2,4 lutidine)2]NO3, -ClO4, [I(2,6 lutidine)2]NO3, -ClO4, [I(2,4,6 collidine)2]NO3, -ClO4, [I(TEDA)2]NO3, [I(quinu-clidine)2]SbCl6, quinuclidine · IBr, quinuclidine · ICl, quinuclidine · IClSbCl5, TEDA · I2, I2 · TEDA · I2, and ClI · TEDA · ICl are reported. The molecular vibrations and force constants are compared to those of similar compounds previously prepared.
Heavy Atom Kinetic Isotope Effects in HCN Elimination from Some Tricyanides in Methanol [1]
Authors: Fouad Fouad M. , Farrell Patrick G. 
Published: February 2015

Abstract
Rates of HCN elimination from polycyanides N,N-dimethyl-4-(1,2,2-tricyanoethyl)-aniline (1), 9-cyano-9-dicyanomethyl fluorene (2), 1,1-diphenyl-1,2,2-tricyanoethane (3), and 2-phenyl-1,1,2-tricyanopropane (4) have been studied in methanol. Elimination from 1 occurs via (E 1 c B)R, mechanism. On the other hand olefin formation from 2-4 has been shown to occur via (E 1)anion pathway. Heavy atom kinetic isotope effects indicated that product stability is not the sole factor controlling the transition state geometries. Values of k12/k14 were found to be in the order 2 > 3 > 4 > 1 which implied transition states with more carbanion-like structure in the opposite direction. Solvent isotope effects and enthalpies of activation were also determined and discussed in terms of transition states geometries.
CaAgP und CaAgAs -Zwei Verbindungen mit Fe2P-Struktur/CaAgP and CaAgAs -Two Compounds with the Fe2P-Structure
Authors: Mewis Albrecht 
Published: February 2015

Abstract
The compounds CaAgP and CaAgAs have been prepared and their structures have been determined. They are isotypic and crystallize in a modified Fe2P-structure (space group P6̄2m-D3
3h) with the lattice constants:
CaAgP a = 704,5(1) pm, c = 417,4(1) pm,
CaAgAs a = 720,4(1) pm, c = 427,0(1) pm.
Derivatives of cis-NPCl2(NSOCl)2 and (NPCl2)2NSOCl, Part XI /Preparation of Amino-phenyl Derivatives of NPCl2(NSOCl)2
Authors: Berg J. B. van den , Grampel J. C. van de 
Published: February 2015

Abstract
Reaction of NPClNH-n-Bu(NSOCl)2 with benzene in the presence of AlCl3 (molar ratio ring compound: AlCl3=1:2) yields NPClNH-n-Bu(NSOPh)2 in three isomeric forms. Using an excess of AlCl3, two isomers with formula NPNH2Ph(NSOPh)2 are formed. These NH2 derivatives can also be isolated from the reaction mixture of NPClPyr(NSOPh)2 (Pyr = pyrrolidino), benzene and an excess of AlCl3.
Photoinduzierte Dechlorierungsreaktion an Dichlorbenzolen, Anilinen und Phenolen in Gegenwart von Protonendonatoren/ Photoinduced Dechlorination Reaction of Dichlorobenzenes, Chloroanilins and Chlorophenols in the Presence of Protondonors
Authors: Parlar H. , Steven P. G. W. , Baumann R. , Korte F. 
Published: February 2015

Abstract
Photokinetic experiments show that the dechlorination reaction of dichlorobenzenes, chloroanilins, and chlorophenols is dependent on nature of solvent, but undependent on oxygen. Quantum yields determined in n-hexane indicate that there is a strong deviation within the ortho, meta, and para products.
Strukturwandel eines Benzocyclobutadiens bei seiner Komplettierung/Structural Change of a Benzocyclobutadiene by Complexation
Authors: Straub Henner , Döring Gerd , Winter Werner 
Published: February 2015

Abstract
η4 (1,2-Di-tert-butyl-3,4,5,6-tetramethylbenzo-cyclobutadiene)tricarbonyliron (2) is prepared by reaction of the respective free benzocyclo-butadiene (1) and nonacarbonyl-diiron at room temperature. X-ray data of the free and complexed ligand are compared.
Regioselektive Ringspaltung von Bacteriochlorophyll-Derivaten durch Photooxidation/Regioselective Ring Cleavage of Bacteriochlorophyll Derivatives by Photooxidation
Authors: Brockmann Hans , Belter Clemens 
Published: February 2015

Abstract
In the presence of oxygen and light magnesium free derivatives of bacteriochlorophyll c form linear tetrapyrroles by oxidative ring cleavage. The structure of these photobilines has been determined by spectroscopic methods.
5aH.10aH.15aH-Tribenzo [b.f.j] [1.4.7] trioxa [9 b] azaphenalene - vermeintliche Benzoxete / 5aH, 10aH, 15aH-Tribenzo[b,f,j][l,4,7]trioxa[9 b]azaphenalenes - Supposed Benzoxetes
Authors: Meier Herbert , Issa Ahmed , Merkle Ursula 
Published: February 2015

Abstract
A supposed benzoxete is determined as a complex polycyclic system: cis,cis,cis-5 aH,10 aH,15 aH-tribenzo[b,f,j][1,4,7]trioxa[9 b]azaplienalene. The structure elucidation is performed by spectroscopycal methods (IR, 1H NMR, 13 C NMR and mass spectroscopy) and by degradation reactions in an acidic or an alkaline medium.
Synthese Pyridin-analoger Tetrahydrocannabinol / Synthesis of Pyridine-analogous Tetrahydrocannabinols
Authors: Lötz Friedhelm , Kraatz Udo , Körte Friedhelm 
Published: February 2015

Abstract
Starting from 4-methylpyridine a 3-aza-Δ8 -tetrahydrocannabinol-analogous (2d) was prepared. The reaction sequence also includes the first synthesis of a 6 H-benzo(4,5)-pyrano(2,3-c)-pyridin-6-on, a novel ring-system. The proposed structures were supported by spectroscopic data (1 H NMR, IR, MS).
Kristallstruktur von SrGe2 bei hohen Drücken / Crystal Structure of SrGe2 at High Pressures
Authors: Evers Jürgen , Oehlinger Gilbert , Weiss Armin 
Published: February 2015

Abstract
After a high pressure -high temperature treatment of orthorhombic SrGe2 (BaSi2 type of structure) a trigonal polymorph (EuGe2 type of structure) is obtained: space group P3̄m 1; a - 410.4 pm, c - 516.5 pm; Z - 1; zGe = 0.406.
Zur Synthese von 2.5-und 2.6-verbrückten Tetrahydromethanoindanen / Synthesis of 2,5-and 2,6-Crosslinked Tetrahydromethanoindanes
Authors: Hustert K. , Schmitzer J. , Parlar H. , Körte F. 
Published: February 2015

Abstract
A direct synthetic method for some 2,5-and 2.6-crosslinked chlorinated tetrahydromethano-indanes, which are the most important conversion products of cyclodiene insecticides under abiotic conditions, is described. The structures of the resulting compounds are confirmed with the aid of MS and 1H NMR.
dh-μ-Carboxilato-e-μ-hydroxo-f-μ-oxo-bis[trichloroantimony(V)] Ein durch Carbonsäuren stabilisiertes dimeres Antimonoxitrichlorid / dh-μ-Carboxilato-e-μ-hydroxo-f-μ-oxo-bis[trichloro-antimony(V)]A Dimeric Trichloro Antimony(V) Oxide Stabilized by Carboxilic Acids
Authors: Koller Franz-J. , Schwarz Wolfgang , Schmidt Armin 
Published: February 2015

Abstract
Tetrachloroantimony(V) carboxilates and tetrachloroantimony(V) alkoxides, resp., react with carboxilic acids and alkohols or water, resp., to yield d,h-μ-carboxilato-e-μ-hydroxo-f-μ-oxo-bis[trichloroantimony(V)] (1, R = H, CH3), a new type of cyclic antimony(V) compounds. The crystal and molecular structure of 1 (R = CH3) is determined by X-ray analysis. Units of 1 (R - CH3) are associated by strong hydrogen bonds. The vibrational spectra of 1 (R = H, CH3) are discussed.
Über die Natur der Siliciumdioxidmodifikation Silica-X / On the Nature of the Silica Modification "silica-X"
Authors: Beneke Klaus , Lagaly Gerhard 
Published: February 2015

Abstract
Silica-X described in 1964 as a new SiO2 modification is the dehydrated form of the crystalline silicic acid H2Si8O17 · xH2O which is obtained by cation exchange from the potassium silicate K2Si8O17 · xH2O.
Neue Modifikationen des Siliciumdioxids / New Modifications of Silica
Authors: Lagaly Gerhard , Beneke Klaus , Kammermeier Haymo 
Published: February 2015

Abstract
A new family of modifications of silica is obtained by thermal dehydration of crystalline silicic acids with layer structures. Examples are SiO2 · 0.11 H2O, SiO2 · 0.04 H2O, SiO2 prepared by dehydration of H2Si14O29 · 5.4 H2O, H2Si8O17 · xH2O and H2Si4O9. The “water content” can amount up to 3 weight percent and results from uncondensed inter-layer silanol groups or from water molecules which are trapped between the layers. In some cases dehydration in the presence of organic interlayer molecules leads to different forms of silica.
Zur Kristallstruktur der Thiocuprate K3Cu8S6 und Rb3Cu8S6 / On the Crystal Structure of the Thiocuprates K3Cu8S6 and Rb3Cu8S6
Authors: Burschka Christian 
Published: February 2015

Abstract
The title compounds can be synthesized by fusion reaction of the alkali carbonates with copper and sulfur at 790 °C. The structure was solved from X-ray diffractometer data of single crystals and refined to an R-value of 0.06. The compounds crystallize with the same layer-type structure which is closely related to that of KCU3S2. Crystal data for K3Cu8S6 (Rb3Cu8S6): space group C2/m,z = 2, ϱcalc = 4.27(4.76) g/cm 3 , a = 17.332(4) (17.840(6)) Å, b = 3.830(2) (3.865(1)) Å, c = 9.889(4) (10.011(3)) Å, β = 104.12(2)° (104.91(2)°).
Preparation and Properties of Two Tris o-Semiquinone Complexes
Authors: Brown Dennis G. , Johnson W. Leo 
Published: February 2015

Abstract
Tris o-benzosemiquinone complexes of iron and chromium are reported. These complexes contain three 3,5-di-t-butyl-o-semiquinato ligands and a trivalent metal ion. The iron complex can be obtained from either the more highly oxidized o-quinone or reduced catechol dianion precursor. The coordinated o-semiquinone ligand is surprisingly stable. A simple infrared criterion is suggested for detecting the presence of a coordinated o-semiquinone.
Über Oxidpnictide: Zur Kenntnis von A2Mn3B2O2 mit A = Sr, Ba und B = As, Sb, Bi / On Oxidpnictides: Preparation and Crystal Structure of A2Mn3B2O2 with A = Sr, Ba and B = As, Sb, Bi
Authors: Brechtel Erwin , Cordier Gerhard , Schäfer Herbert 
Published: February 2015

Five new oxidpnictides have been prepared and structurally characterized. They crystallize in the tetragonal system, I4/mmm, with the following constants:
Sr2Mn3As2O2: a = 416 ± 1 pm, c = 1884 ± 4 pm, c/a = 4.529,
Ba2Mn3As2O2 : a = 424.8 ± 0 5 pm, c = 1977 ± 3 pm, c/a = 4.654,
Sr2Mn3Sb2O2 : a = 426.2 ± 0.4 pm, c = 2011 ± 2 pm, c/a = 4.718,
Ba2Mn3Sb2O2 : a = 436.7 ± 0.5 pm, c = 2078 ± 2 pm, c/a = 4.758,
Sr2Mn3Bi2O2 : a = 428 ± 1 pm, c = 2055 ± 5 pm, c/a = 4.801.
Mn- and As(Sb,Bi) atoms form tetragonal pyramids, connected by common edges in the basis to two-dimensional sheets. These sheets are separated by double layers of Sr atoms, in which Mn and O atoms are located forming MnO4 square plane nets.
Das Perowskitsystem CH3NH3 [Pb,Sn1-nX3] (X = Cl, Br, I) / The Perovskite System CH3NH3[PbnSn1-nX3] ( X = C1, Br, I)
Authors: Weber Dieter 
Published: February 2015

Abstract
The mixed Sn(II)/Pb(II) compounds of the type CH3NH3[PbwSn1-nX3] (X=Cl, Br, I) have the cubic perovskite structure which is established by X-ray powder data and 119Sn Mössbauer spectroscopy. With exception of the chloro system the coloured compounds show electrical conductivity which increases with increasing Sn(II) content. Their physical properties can be interpreted by means of a "p-resonance bonding". Replacement of Sn(II) by Pb(II) and I by Br and Cl decreases this bonding effect, which is produced by the interaction of filled X p-orbitals with empty p-orbitals of Sn(II) or Pb(II). The synthesis is described
Ein Beitrag zur Photochemie aromatischer Nitroverbindungen, III / A Contribution to the Photochemistry of Aromatic Nitro Compounds
Authors: Keim Jürgen 
Published: February 2015

Abstract
During UV irradiation of nitrobenzene and some derivatives in benzene solution biphenyls are formed as in the case of the corresponding iodobenzenes. Using fluorobenzene as a solvent, isomeric fluorobiphenyls (o, m, p) will be found as reaction products having a definite distribution (o >m > p), which is characteristic for substitution by radicals. Therefore, we conclude that the CN-bond is split homolytically. Besides the biphenyls, other important reaction products of the aromatic nitro compounds - phenols and nitrophenols - are identified
Darstellung und Struktur von K2PdAs2 / Preparation and Structure of K2PdAs2
Authors: Schuster Hans-Uwe , Rozsa Sandor 
Published: February 2015

K2PdAs2 was prepared from the elements. It crystallizes orthorhombically , space group Cmcm,
a = 653.6 pm, b =1412.1 pm, c = 602.5 pm, forming infinite Pd-As2-zig-zag-ribbons and conforming to a filament
(—)D-und (+)D-4-Methoxyphenylmethyl- thiophosphinsäure, Überprüfung der Racematspaltung mittels 31P{ 1H}-NMR-Spektroskopie/(—)D-and (+ )D-4-Methoxyphenylmethyl- thiophosphinic Acid, Control of the Resolution by 31P{1H} NMR Spectroscopy
Authors: Kuchen Wilhelm , Kutter Jurgen 
Published: February 2015

Abstract
(-)D-and (+)D-4-methoxyphenylmethyl-thiophosphinic acid, quinine salts of (-)D-and (+)D-4-methoxyphenylmethylthiophosphinic acid, checking of resolution by 31P{ 1H} NMR-spectroscopy
(-)D-and(+)D-4-CH3OC6H4(CH3)P(S)OH acid were obtained from fractional crystallization of the quinine salt of the racemic acid. 31P{1H} NMR spectroscopy proved to be very useful in checking the separation process as well as the optical purity of the diastereomers and enan­tiomers.
Notizen: Molybdän(V)-nitridobromid, MoNBr2 /Molybdenum(V)-nitridobromide, MoNBr2
Authors: Krüger Norbert , Dehnicke Kurt 
Published: February 2015

Abstract
MoNBr2 is prepared by thermolysis of MoNBr3 in vacuo at 260 °C. It forms a dark brown hygroscopic powder; the IR spectrum indicates a MoN-multiple bond. The magnetic moment (μeff = 0.65 B.M.) is smaller than in undisturbed d1-systems, which is due to spin-spin-interaction. The monohydrate, MoNBr2 · H2O, can be identified by the mass spectrum.
Copper(II) Complexes Containing 3-n-Nonylcatechol: Preparation and Ligand Oxidation
Authors: Brown Dennis G. , Hughes William J. 
Published: February 2015

Abstract
Ternary copper(II) complexes containing the dianion of 3-n-nonylcatechol and a number of bidentate nitrogen containing counter ligands have been prepared and characterized. It has been demonstrated that, in the presence of oxygen, the catecholato ligand undergoes intradiol ring cleavage in a fashion similar to that carried out by intradiol aromatic dioxygenases. The 3-n-nonylcatecholato ligand was chosen as an analog for the naturally occuring 3-pentadecylcatechols or "urushiols" which are the active allergens in plants such as poison ivy.
Beiträge zur Chemie der Pyrrolpigmente, XXXIII [1] Darstellung, Struktur und Eigenschaften von isomeren N-Methyl-Bilatrienen-abc (N-Methyl-etiobiliverdine-IV-γ) / On the Chemistry of Pyrrole Pigments, XXXIII [1] Synthesis, Structure and Properties of Isomeric N-Methyl-bilatrienes-abc (N-Methyl-etiobiliverdines-IV-γ)
Authors: Falk Heinz , Thirring Klaus 
Published: February 2015

Abstract
Methylation of etiobiliverdin-IV-γ yields a ring-A N-methylated product the structure of which was proven by comparison with the corresponding monolactimether and the ring-B methylated product which was synthesized on an independent route. The configura-tion (Z,Z,Z) was deduced by 1H-NMR experiments and a more or less helical conformation which is most twisted at the ring-A methine fragment was found. Photoisomerization exclusively takes place at this position giving the (E,Z,Z) diastereomer, a reaction which is discussed in terms of the correlation of light absorption, methine single bond twist and photochemical selectivity.
Darstellung eines Zinnhomologen der "Methylidyn-Cluster" / Preparation of a Tin Homologue of the "Methylidyne Clusters"
Authors: Schwarzhans Karl E. 
Published: February 2015

Abstract
A new tin-cobaltcarbonyl-cluster, a homo-logue of the methylidyne clusters, has been prepared and identified by IR and masspectro-metric measurements.
Über den Chemismus der Wiesner-Reaktion auf Lignin / On the Chemistry of the Wiesner Reaction on Lignin
Authors: Geiger Hans , Fuggerera Helga 
Published: February 2015

Abstract
It is demonstrated that the Wiesner reaction (detection of lignin with phloroglucinol/HCl) is due not only to cinnamic aldehyde but also to cinnamic alcohol units of the lignin. The limits of detection of some compounds related to lignin with phloroglucinol/HCl, naphthoresor-cinol/HCl and orcinol/HCl are determined. The chemistry of the reactions is discussed.
ESR Evidence of Peroxy Radical Formation during Radiolysis of Frozen Carbohydrate Solutions
Authors: Plonka Andrzej , Bednarek Janusz , Żegota Henryk 
Published: February 2015

Abstract
During thermal annealing of the frozen polycrystalline samples of aqueous carbohydrate (dextran, melibiose, maltose, glucose, and xylose) solutions y-irradiated at 77 K the formation of peroxy radicals by addition of oxygen to the primary carbon-based radicals was observed at 190-220 K by the ESR method.