bluuebunny/crossref_metadata_2025_split huggingface dataset:
Solid Phase Synthesis of Thymopoietin-(32-36) Using Adpoc Amino Acids and its Biological Activity +
Authors: Rampold Georg , Lundanes Elsa , Folkers Karl , Voelter Wolfgang , Kalbacher Hubert , Bliznakov Emile 
Published: February 2015

Abstract
An exemplary peptide has been synthesized for the first time by an automated solid-phase instrumentation which utilized the new Adpoc (1 -(1-adamantyl) -1 -methylethoxycarbonyl-) group for protection of the a-amino groups of the amino acids. The pentapeptide, thymo-poietin-(32-36) was synthesized, and shown to be pure by criteria including HPLC. Using a Cytoxan (cyclophosphamide) model system for suppression of a primary, hemolytic, humoral, antibody level, thymopoietin-(32-36) showed low activity, and reversed the suppressing effect of Cytoxan. This biological activity apparently is the result of cummulative effect.
Optisch aktive Übergangsmetall-Komplexe, LXX [1]. Darstellung der optisch aktiven Diastereomeren C5H5Fe(CO)- (CH2OCH3)P(C6H5)2N(CH3)R* mit chiralen Fe-Atomen / Optically Active Transition Metal Complexes, LXX [1]. Preparation of the Optically Active Diastereoisomers C5H5Fe(O)- (CH2OCH3)P(C6H5)2N(CH3)R* with Chiral Fe Atoms
Authors: Brunner Henri , Leblanc Jean-Claude 
Published: February 2015

Abstract
The two diastereoisomers C5H5Fe(CO)(CH2OCH3)P(C6H5)2N(CH3)R* (Ba, b), with R* = (S)·CH(CH3)(C6H5), differing only in the Fe configuration, have been obtained by photochemical reaction of C5H5Fe(CO)2CH2OCH3 with (S)-(+)-P(C6H5)2N(CH3)R*. The optically pure isomer 3 a can be isolated by chromatography at low temperature; its chiroptical properties are discussed.
Mesylhydroxylamine, IV [1] Silylierte N-Mesylhydroxylamine / Mesylhydroxylamines, IV [1] Silylated N-Mesylhydroxylamines
Authors: Pohlmann Gerd , Brink Klaus , Bliefert Claus 
Published: February 2015

Abstract
The preparation and some properties of the two silylated N-Mesylhydroxylamines, CH3SO2N(H)OSi(CH3)3 and CH3SO2N[Si(CH3)3]OSi(CH3)3, are reported.
Chemie polyfunktioneller Liganden, 60 [1]. Über Käfigverbindungen mit den Heteroelementen Arsen und Selen / Chemistry of Polyfunctional Ligands, 60 [1]. On Cage Compounds with the Heteroelements Arsenic and Selenium
Authors: Eilermann Jochen , Lietz Martin 
Published: February 2015

Abstract
The reaction of 1,1,1-tris(diiodoarsinomethyl)ethane, CH3C(CH2Asl2)3 (1) with NaAs(C6H5)2 in the molar ratio of 1:3 gives 4-methyl-1,2,6-triarsa-tricyclo[2,2,1,02,6]-heptane, CH3C(CH2As)3 (2). The previously synthesized CH3C(CH2AsS)3 (4) can be desulphurated with triphenylphosphine to yield also 2. The reaction of 1 with NaSeH gives the new cage compound 6-methyl-1,3,4-triarsa-2,8-diselena-tricyclo[3,3,1,03 ,4]-nonane, CH3C(CH2As)3Se2 (5).
Zur Kenntnis von Ca4Sb2O / Preparation and Crystal Structure of Ca4Sb2O
Authors: Limartha Hadi , Eisenmann Brigitte , Schäfer Herbert , Graf Hans A. 
Published: February 2015

Abstract
The formerly described compound Ca2Sb is to be corrected to Ca4Sb2O as shown by X-ray diffractometer data of single crystals and neutron diffraction diagramms of powders. The compound crystallizes in the K2NiF4 structure type.
29Si-Kernresonanzmessungen an Polysilanen. 2. Isotetrasilane / 29Si NMR Measurements on Polysilanes. 2. Isotetrasilanes
Authors: Marsmann H. C. , Raml W. , Hengge E. 
Published: February 2015

Abstract
Isotetrasilanes with the general formula XSi(SiY3)3 (X = F, Cl, Br, I, CH3, OCH3; Y = CH3, OCH3, Cl) were studied by 29Si and 13C NMR. One-bond coupling constants between the silicon nuclei as well as between carbon and silicon were studied. It was found, that the magnitudes depend not only on the electronegativity of X and Y, but also on the steric effect of the substituent X.
Steady State Radiolysis of Aqueous Aerated Solutions of 5,6-Dihydrothymine. Identification of the Major Degradation Products
Authors: Cadet J. 
Published: February 2015

Abstract
The major radiation-induced degradation products of 5,6-dihydrothymine (1) in aqueous solutions saturated either with O2 or N2O/O2 (75/25 v/v) were identified as thymine (10), the trans-and cis-isomers of 6-hydroperoxy-5,6-dihydrothymine (5, 7), 5-hydroperoxy-5,6-dihydrothymine (9), and their corresponding hydroxy derivatives (4, 6, 8). The formation of these compounds is explained in terms of initial H-abstraction from the C(5) and C(6) carbons which gives rise respectively to the transient 5-yl and 6-yl radicals. Thymine hydroxy-hydroperoxides (11-14) and their decomposition products (17-20), which are derived from hydroxyl radical attack at the 5,6-ethylenic bond of thymine (10), were also characterized.
Darstellung und Kristallstruktur von SbCl3I2 ·1.4-Dithian/Preparation and Crystal Structure of SbCl3 · I2 · 1,4-Dithiane
Authors: Kiel Gertrud 
Published: February 2015

Abstract
The darkred compound SbCl3 · I2 · S2C4H8 has been prepared and its crystal structure determined. This new compound crystallizes in the monoclinic system, space group P21, with a = 849.2 pm, b = 904.2 pm, c = 923.6 pm and β = 106.1° at a temperature of 113 K, and with a = 858.8(2) pm, b = 914.7(3) pm, c = 934.0(4) pm and β = 106.62(3)° at a temperature of 293 K, respectively. The structure is built up from chains (SC2H4S···I-I-ClSbCl2)∞ with a ψ-trigonal bipyramid around Sb.
New Furanoid Diterpenes from Teucrium scordium L.
Authors: Papanov Georgi Y . , Malakov Peter Y . 
Published: February 2015

Abstract
Two new furanoid diterpenes of clerodane type, 6-ketoteuscordin (1) and 6α-hydroxy-teuscordin (2) have been isolated from Teucrium scordium var. scordium, Lamiaceae. Their structures and stereochemistry have been determined.
Zur Diastereoisomerie natürlicher und synthetischer α-Bisabolole/On the Diastereoisomerism of Natural and Synthetic α-Bisabolols
Authors: Flaskamp Elmar , Nonnenmacher Gerhard , Isaac Otto 
Published: February 2015

Abstract
The stereochemistry of α-bisabolol is discussed. The chiralities of the different α-bisabolols from Myoporum crassifolium, Populus balsamifera and Vanillosmopsis erythropappa are deduced from the absolute configuration of natural bisabolol from chamomile, which has to be considered as being (1′S,2S)-configurated according to most recent investigations.
Based on this assumption, (1′S, 2R)-configuration has to be ascribed to (-)-α-bisabolol from Myoporum crassifolium, whereas (1′R,2R)-resp. (1′S,2S)-structure is present in (+)-α-bisabolol from Populus balsamifera and (-)-α-bisabolol from Vanillosmopsis erythropappa being therefore enantiomeric to the latter. Consequently, the (-)-α-bisabolols from Matricaria chamomilla and Vanillosmopsis erythropappa turn out to be identical in all respects.
Synthetic α-bisabolols, however, featuring approximately equal amounts of all the four possible stereoisomers, differ not only optically but also in their stereochemical uniformity from natural α-bisabolols.
By means of NMR spectrometric methods the identity of the native active agent can be established in chamomile specialities; as a consequence possible admixtures of synthetic racemates of α-bisabolol thus can be identified and quantified.
Studies on Ferrocene Derivatives(VII)./Synthesis of Some New Ferrocenyl Dibromides, Benzofuranes and Indoles
Authors: El-Khawaga A. M. , Hassan K. M. , Khalaf A. A. 
Published: February 2015

Abstract
A series of ferrocenyl chalcones (1-7) have been prepared by the interaction of acetylferrocene with aromatic aldehydes. Reaction of these ferrocenyl chalcones with hydrazines gave ferrocenyl pyrazolines (8-21). Also, the reaction of chalcones with bromine yielded the corresponding dibromides (22-25). Fusion of dibromides (22-25) with 2-naphthol and 1-naphthylamine gave the corresponding substituted ferrocenylbenzofuranes (26-29) and ferrocenyl endoles (30-33) respectively.
Notizen: Rhomboedrisch kristallisierende Zink-hexacyanometallate(III) Zn3[M(CN)6]2/ Rhombohedrally Crystallizing Zinc Hexacyanometalates(III) Zn3[M(CN)6]2
Authors: Siebert Hans , Jentsch Walther 
Published: February 2015

Abstract
The preparation of a non-cubic modification of water-free hexacyanometalates(III) Zn3[M(CN)6]2 (M = Cr, Fe, Co) is described. The X-ray powder diagrams of these compounds have been indexed rhombohedrally, space group D6
3d-R3̄c, Z = 2.
Darstellung symmetrisch bisaminierter Carbodiphosphorane R2NPh2P=C=PPh2NR2 [1] / Synthesis of Symmetrical Diaminocarbodiphosphoranes R2NPh2P=C=PPh2NR2 [1]
Authors: Appel Rolf , Waid Karl 
Published: February 2015

The hitherto unknown symmetrical diamino carbodiphosphoranes
R2NPh2P = C = PPh2NR2 (5 a-d (R = CH3, Et, nPr, nBu) are obtained in good yield by NaH dehydrohalogenation of the corresponding aminophosphonium salts

3 a-d can be prepared by aminolysis of C(PPh2Cl)2 (1) or, more conveniently, directly in the three component reaction ditertiary phosphine/amine/CCl4 (31P{1H} and 13C{1H} NMR).
Synthese und Struktur von 1.2.3-Thiadiazol- und 1.2.3-Selenadiazol-Pentaearbonyl-Komplexen der Elemente Chrom und Wolfram / Synthesis and Structure of 1,2,3-Thiadiazol- and 1,2,3-Selenadiazol-Pentacarbonyl-Complexes of the Elements Chromium and Tungsten
Authors: Bätzel Volker , Boese Roland 
Published: February 2015

Abstract
From the reactions of (THF)M(CO)5 (M = Cr, W) with 4-phenyl-1,2,3-thiadiazol, 4-methyl-5-carboxylic acid-1,2,3-thiadiazol, 4-methyl-5-carboxylic acid ethyl ester-1,2,3-thiadiazol and 4-methyl-1,2,3-selenadiazol, pentacarbonyl-complexes are obtained as air stable compounds. IR spectra of products of similar reactions with M = Mo provide some evidence of the formation of analogous complexes. The thiadiazol complexes are also accessible directly, by photochemical displacement of carbonmonoxid in THF from the parent carbonyl. The X-ray structures of pentacarbonyl-(4-phenyl-1,2,3-thiadiazol)-tungsten and pentacarbonyl-(4-methyl-1,2,3-selenadiazol)-chromium show the coordina-tion of the ligand to the pentacarbonyl-metal-fragment via the nitrogen in position 2.
Electret Model for the Collective Behaviour of Biological Systems
Authors: Bilz H. , Büttner H. , Fröhlich H. 
Published: February 2015

Abstract
It is suggested that several basic properties of biological systems, such as muscular motions, active transport of energy, etc., may be described in terms of a dynamical model possessing metastable ferroelectric states. The model is based on the observation that confi-gurationally unstable anions, in particular O2-, can lead to ferroelectric phase transitions. Due to the highly variable electronic polarizability of such ions a fourth-order potential is generated which can be the origin of three types of solitary excitations: elastic 'pulse' solitons, ferroelectric 'kink' (or domain-wall) solitons and periodic (coherent) solitary waves. Their possible relation to biological phenomena is discussed.
Stabilization of a Host-Guest Type Complex by Bifurcated Hydrogen Bonds : 18-crown-6 · (2,4-Dinitrophenylhydrazine)2
a
Authors: Hilgenfeld R. , Saenger W. 
Published: February 2015

Abstract
The X-ray structure of the 1:2 host-guest complex between 1,4,7,10,13,16-hexaoxa-cyclooctadecane (18-crown-6) and 2,4-dinitrophenylhydrazine is reported. Crystallo-graphy data are: space group P21/c, a = 8.557(2), b = 16.745(6), c = 12.387(4) Å, β = 117.08(13)°, Z = 2, Dm = 1.37 g · cm-3 , Dc = 1.387 g · cm-3 , m.p. 414 K (decomp.). The present B is 0.11 for 1733 diffractometer data.
In the complex, the two 2,4-dinitrophenylhydrazine molecules are located "above" and "below" the plane of the hexaether and related by an inversion centre. They interact with the macrocyclic host via N-H···0 hydrogen bonds, two of which are bifurcated. All the ether oxygens of the crown serve as hydrogen bond acceptors.
Sulfonamidyls, 4. Ab Initio MO Calculations on Sulfonyl and Carbonyl Substituted Aminyl Radicals
Authors: Teeninga Herman , Nieuwpoort Wim C. , Engberts Jan B. F. N. 
Published: February 2015

Abstract
The relative magnitude of the nitrogen hyperfine splitting constants of sulfonamidyls and carboxamidyls is rationalized in terms of the results of ab initio MO calculations using the "double zeta" basis set of Roos and Siegbahn.
Opening of the B10H10
2- Cage to Give B10H14
Authors: Mongeot H. , Atchekzai H. R. 
Published: February 2015

Abstract
Decaborane B10H14 is formed by opening the B10H10
2- cage in strong acidic medium. The reaction must be carried out in the presence of an inert solvent which dissolves B10H14. The best yields (28%) are obtained when zinc dust is added to the reaction mixture. The conversions of B10H10
2- into B10H14 or B10H12(Et2S)2 probably obey the same mechanism.
Elektrochemische Eigenschaften von Dihydropyridin-und Pyridinderivaten / Electrochemical Properties of Pyridine and Dihydropyridine Derivatives
Authors: Abou-Elenien G. , Rieser J. , Ismail N. , Wallenfels K. 
Published: February 2015

Abstract
The electrochemical oxidation and reduction properties of different dihydropyridines and pyridines have been investigated in non aqueous solvent as benzonitrile and aceto-nitrile with tetra-n-butylammonium perchlorate as supporting electrolyte at platinium electrodes using DC-voltametry, cycl. voltametry and coulometry. Possible redox-mechanisms are discussed.
13C, 1H-Spin-Spin Kopplungskonstanten,VIII. 2-Methyl- und 3.5-Dimethyladamantan / 13C, 1H Spin-Spin Coupling Constants, VIII. 2-Methyl- and 3,5-Dimethyladamantane
Authors: Aydin Rafet , Gunther Harald 
Published: February 2015

Abstract
One-bond, geminal and vicinal 13C, 1H coupling constants have been determined for 2-methyl-and 3,5-dimethyladamantane using the derivatives deuterated in position 2 and 1, respectively, and the relation nJ(13C, 1H) = 6,5144 nJ(13C, 2H) for the conversion of the measured nJ(13C, 2H) values. The effect of methyl-substitution on these parameters is discussed.
Die Kristallstruktur von Te6O11Cl2 / The Crystal Structure of Te6O11Cl2
Authors: Abriel Walter 
Published: February 2015

Abstract
Crystals of the title compound are monoclinic (space group P21/m) with a = 6.844(4) Å, 6 = 6.800(4) Å, c= 15.227(9) Å, y= 120.19° and Z = 2. The structure contains infinite cationic [(Te12O22) 4+]∞ -chains with three different sites for tellurium. There are three oxygen atoms in a y-tetrahedral arrangement around Te 1, and four oxygen atoms in a ψ-trigonal-bipyramidal coordination around Te 2 and Te 3.
Isolierbare Chlor [(thio)alkoxy] triorganylphosphoniumchloride als Zwischenprodukte der Oxiran (Thiiran)-Halogenierung mit Dichlorphosphoranen [1] / Isolable Chloro[(thio)alkoxy]triorganylphosphoniumchlorides as Intermediates of the Oxirane (Thiirane)-Halogenation with Dichlorophosphoranes [1]
Authors: Appel Rolf , Gläsel Volker Ingo 
Published: February 2015

Abstract
Isolable chloro[(thio)alkoxy]triorganylphosphoniumchlorides RR2'P-X-CH2R"] + Cl- are synthesized by reaction of oxiranes (2-5) (oxetane (6), thiiranes (18a-c)) with dichloro-phosphoranes (1a-f). Structure and stability are discussed. Thermal Arbusov-rearrange-ment yields vicinal di-resp. trihalo-alkanes and phosphanoxides. The structures are confirmed by 31P{1H} and 13C{1H} NMR data.
Elektrochemische Synthesen, VII [1] Elektrochemische Substitutionsreaktionen an M(CO)6-n (PR3)n-Komplexen (M = Cr, Mo, W) / Electrochemical Syntheses, VII [1] Electrochemical Substitution Reactions of M(CO)6-n(PR3)n Complexes (M = Cr, Mo, W)
Authors: Grobe Joseph , Zimmermann Heinz 
Published: February 2015

Abstract
The principle of electrochemical substitution of metal carbonyls has been applied to monosubstituted derivatives M(CO)5PR3 (M = Cr, Mo, W) with the aim of selective prepa-ration of di-and trisubstituted products M(CO)4(PR3)(PR'3) or M(CO)3(PR3)(PR'3)2. It is shown that, due to simultaneous replacement of CO and PR3 mixtures of products are formed.
Photodimerisierung von 6-trans-Styryl-4-methoxy-2-pyron (= 5.6-Dehydrokawain), 1. Mitteilung / Photodimerisation of 6-trans-Styryl-4-methoxy-2-pyrone (= 5,6-Dehydrokawain)
Authors: Kaloga Macki , Christiansen Ilona 
Published: February 2015

Abstract
The photochemical behaviour of 5,6-Dehydrokawain (1) was investigated. An aceton solution of 1 was placed into a Petri-dish and allowed to evaporate. After a four weeks irradiation with a 100 W light bulb from a distance of 30 cm [1] the main component was isolated. Its structure and configuration is elucidated as r-1,c-2-di[6-(4-methoxy-2- pyronyl) ] - t- 3 ,t -4-diphenyIcyclobutane (2) by means of spectroscopic methods and correlation with β-truxinic acid after degradative reaction.
Perfluormethyl-Element-Liganden, XXV [1] Organozinnverbindungen als Reagenzien, IV: Spaltungsreaktionen der Element-Element-Bindung in Komplexen des Typs M(CO)5ER2ER′2 bzw. M(CO)5ER2E′R′ mit Trimethylstannan (R, R′ = CH3, CF3; E = P, As; E′ = S, Se, Te; M = Cr, Mo) / Perfluoromethyl-Element Ligands, X X V [1] Organotin Compounds as Reagents, IV:Cleavage Reactions of the Element-Element Bond in Complexes of the Type M(CO)5ER2ER′2 and M(CO)5ER2E′R′ , Respectively, with Trimethylstannane (R, R′ = CH3, CF3; E = P, As; E′ = S, Se, Te; M = Cr, Mo)
Authors: Grobe Joseph , Le Van Due 
Published: February 2015

Abstract
The cleavage of element-element bonds in ligands of the type R2EER′2 and R2EE′R′ (R, R′ = CH3, CF3; E = P, As; E′ = S, Se, Te) coordinated to M(CO)5-fragments (M = Cr, Mo) by Me3SnH (Me = CH3) has been studied in some detail by NMR spectroscopic measurements (1H, 19F). In comparison with the analogous reactions of the free ligands, the rate of reaction is considerably reduced, wheras the cleavage direction is generally retained. Possible reaction intermediates have been synthesized by independent routes and tested under comparable conditions.
Oligophosphin-Liganden, III [1] Bis(3-diphenylphosphinopropyl)phenylphospbinchloroiridium(I) * * und dessen Carbonyl-und Hydridderivate / Oligophosphine Ligands, III [1] Bis(3-diphenylphosphinopropyl)phenylphosphinechloroiridium(I) and its Carbonyl and Hydride Derivatives
Authors: Arpac Ertugrul , Dahlenburg Lutz 
Published: February 2015

Abstract
The title complex, IrCl(bdpp) (1), where bdpp = PhP[(CH2)3PPh2]2, has been obtained from [IrCl(C8H14)2]2 and the triphosphine ligand. Characteristic 31P NMR data of 1 dissolved in THF are δ(P̲Ph2) = 2.7 and δ(P̲Ph) = - 19.9 with cis-2J(P̲IrP̲) = 32.8 Hz. Reaction of 1 with CO proceeds stepwise to yield five-coordinate IrCl(CO)(bdpp) (2) and ionic [Ir(CO)2(bdpp)]Cl (3). A trigonal bipyramidal geometry with equatorial CO ligands is assigned to the cation of 3 on the basis of its v(CO) infrared intensities. When allowed to react with HCl, 1 gives the monohydride IrHCl2(bdpp) (4). Similarly, the dihydride IrH2Cl(bdpp) (5) is formed from 1 and H2. As has been established by IR and NMR spectroscopy, 4 and 5 adopt cis-mer-octahedral structures.
Solvent Effects on the IR Spectra of N-Methylacetamide
Authors: Manzur J. , González G. 
Published: February 2015

Abstract
The solvent effect on the v(N-H) amide I and amide II IR bands of N-methylacetamide were investigated. The frequency shifts could be related to the solvent donor and acceptor num-bers by mean of a two parameters relationship that accounts for the mutual influence between the two interacting sites of the amide.
Übergangsmetall-Carben-Komplexe, CXIX. Carbonyl [ethoxy(triphenylsilyl)carben] (dinitrosyl)eisen/ Transition Metal Carbene Complexes, CXIX. Carbonyl[ethoxy(triphenylsilyl)carbene](dinitrosyl)iron
Authors: Fischer Ernst Otto , Stadler Peter 
Published: February 2015

Abstract
Dicarbonyl(dinitrosyl)iron reacts with triphenylsilyllithium and subsequently with triethyloxonium tetrafluoroborate to give carbonyl[ethoxy(triphenylsilyl)carbene](dinitrosyl) iron.
Complexes of 1,2,4-Triazoles, Part XVII The Crystal Structure of Tris-μ-(4-ethyl-1,2,4-triazole-N1,N2)- (4-ethyl-1,2,4-triazole-N1)-aquo-bis [bis(thiocyanato-N)- nickel(II)]hydrate, Ni2(C4N3H7)4(H2O)(NCS)4 ·H2O(x ≃ 2.5)
Authors: Vos Ger , Kok Anthonie J. de , Verschoor Gerrit C. 
Published: February 2015

Abstract
The crystal structure of Ni2(C4N3H7)4(H2O)(NCS)4 · 2.5 H2O has been determined by X-ray diffraction techniques. The compound crystallizes in the monoclinic space group P21/n with a = 15.121(4), b= 13.237(2), c= 18.069(3), β = 94.71(2)° and Z = 4; R = 0.040 (Rm = 0.051). The compound consists of dimeric units in which two Ni ions are bridged by three ethyltriazole (Ettrz) groups. For one Ni, two N donating NCS- groups and an Ettrz coordinating by only one N atom complete the NiNe octahedron. The other Ni atom, which is also octahedrally coordinated, has a coordinated water molecule instead of a monodentate Ettrz.
NMR-Untersuchungen an Organoelement(IVb)-phosphinen, VII [1] 119Sn-NMR-Untersuchungen an Trimethylstannylphosphin-substituierten Verbindungen der Pseudonickelcarbonylserie/NMR Studies on Organoelement(IVb)-phosphines, VII [1] 119Sn NMR Spectroscopic Investigations on Trimethylstannylphosphine Substituted Compounds of the Pseudonickelcarbonyl Series
Authors: Meißner Manfred , Kroth Heinz-Jürgen , Köhricht Karl-Heinz , Schumann Herbert 
Published: February 2015

Abstract

119Sn NMR chemical shifts as well as 1H119Sn and 31P 119Sn NMR coupling constants are reported and discussed for compounds of the type [(CH3)3Sn]n[tC4H9]3-n P (n = 1, 2, 3) and related complexes Mn(NO)3L, Fe(CO)(NO)2L, Co(CO)2(NO)L and Ni(CO)3 L (L = organotin phosphine).
Eine neue Form von Al(H2PO4)3 mit dreidimensionaler Al-O-P-Vernetzung/ A New Form of Al(H2PO4)3 with Three-Dimensional Al-O-P Crosslinking
Authors: Brodalla Dieter , Kniep Rüdiger , Mootz Dietrich 
Published: February 2015

Abstract

3
∞[Al(H2PO4)3] has been prepared and characterized as a second modification of aluminium tris(dihydrogenphosphate). Its crystal structure is a three-dimensional Al-O-P network of AlO6 octahedra, linked by common vertices through O2P(OH)2 tetrahedra with six further octahedra. Each P-OH group is a proton donor as well as a proton acceptor of O-H···O hydrogen bonds arranged in angular chains of alternating polarity in macroscopic domains.
Zur Stereochemie der Bisaboloide aus Matricaria chamomilla L/On the Stereochemistry of the Bisaboloids from Matricaria chamomilla L.
Authors: Flaskamp Elmar , Nonnenmacher Gerhard , Zimmermann Gottfried , Isaac Otto 
Published: February 2015

Abstract
The stereochemistry of the bisaboloids in chamomile-with the exception of bisabolol-oxide C-has been elucidated. The in-vitro-examination of the mutual convertibilities of some bisaboloids gave evidence for the stereochemical accordance of the common chiral centres of all the bisaboloids. The absolute configurations of the remaining third asymmetric carbon atoms in bisabololoxide A and B have been determined by NMR spectrometric studies in comparison with their unnatural semisynthetic epimers. All the stereogenic centres of the bisabololoxides A and B, of (-)-α-bisabolol and of bisabolonoxide A turn out to be S-configurated.
Synthese und Molekülstruktur der dreikernigen Cluster-Verbindung (η5C5Me5)IrFe2(CO)9 / Synthesis and Molecular Structure of the Trinuclear Cluster Compound (η5-C5Me5)IrFe2(CO)9
Authors: Guggolz Ernst , Ziegler Manfred L. , Kalcher Willibald , Plank Johann , Riedel Doris , Herrmann Wolfgang A. 
Published: February 2015

Abstract
Reaction of triirondodecacarbonyl (1) with the dinuclear chloroiridium complex [(η5 -C5Me5)Ir(μ-Cl)Cl]2 (2) in benzene at 50 °C yields the novel mixed iron iridium cluster of composition (η5 -C5Me5)IrFe2(CO)9 (8) the molecular structure of which has been established by X-ray diffraction methods. The mononuclear half-sandwich complex (η5 -C5Me5)Ir(CO)2 (4) present in the reaction mixture was found to represent the immediate precursor of the cluster compound 8.