Published by De Gruyter

Volume 54 Issue 8

Issue of Zeitschrift für Naturforschung B

Contents
Journal Overview

June 2, 2014

Darstellung und Eigenschaften von Tetra(n-butyl)ammonium-cis-diacidooxophthalocyaninato( 2-)niobaten(V) und -tantalaten(V); Kristallstruktur von (ⁿBu₄N)^CIS[Nb(F)₂Opc^2-]

Karsten Schweiger, Heiner Hückstädt, Heiner Homborg

Page range: 963-969

Abstract

Tetra(n-butyl)ammonium ds-diacidooxophthalocyaninato(2-)niobates(V) and -tantalates(V), ( n Bu 4 N) cis [M(X) 2 Opc 2- ] (M = Nb, Ta; X = F, Cl, NCS, N 3 ), are obtained by the reaction of cis [M(Cl) 3 pc 2- ] or cis [M(Cl}Opc 2- ] (M = Nb, Ta) with the respective tetra(n-butyl)ammonium salt. ( n Bu 4 N) cis [Nb(F) 2 Opc 2- ] crystallizes in the monoclinic space group P2 1/ n with cell parameters a = 13.460(5), b = 13.820(5), c = 23.360(5) Å, ß = 92.640(5)°, Z = 4. The heptacoordinated Nb(V) atom is surrounded by four isoindole nitrogen atoms (N iso ) of the pc 2- ligand, two fluorine atoms and one oxygen atom in a distorted square-base-trigonal-cap polyhedron. Nb(V) is displaced out of the centre of the (N iso ) 4 plane (Ct(N iso )) towards the acido ligands (d(Nb-Ct(N iso )) = 1.241 Å). The average (Nb-N iso ), (Nb-F), and (Nb-O) distances are 2.300, 1.957, and 1.720(5) Å, the (F-Nb-F) and the average (O-Nb-F) angles are 79.8(2) and 91.8°, respectively. The pc 2- ligand is concavely distorted. Typical π-π*-transitions of the pc 2- ligand are observed in the UV/Vis spectra at ca. 14500 and 29300 cm -1 . Vibration frequencies υ as,s (M-X), υ(M-O) and δ(X-M-0) have been assigned.

June 2, 2014

Metallkomplexe mit biologisch wichtigen Liganden, CXXI [1]. Orthopalladierte Enolate aus N-(Diphenylmethylen)-Schiff-Basen von a-Aminosäureestern als ambivalente 1,3-Dipole in [2+3]-Cycloadditionsreaktionen. Strukturen einer Reihe von Cycloaddukten

Bernhard Schreiner, Reinhold Urban, Anastassios Zografidis, Karlheinz Sünkel, Kurt Polborn, Wolfgang Beck

Page range: 970-988

Abstract

Enolates of ortho-palladated N-(diphenylmethylene) Schiff bases from glycine esters (R 3 P)Pd[(C 6 H 4 )(C 6 H 5 )C=N-C(R')=CO 2 R] were isolated and have been shown to be ambivalent 1,3-dipoles in [2+3] cycloadditions. Tetracyanoethene, dimethyl acetylene dicarboxylate, dimethyl azodicarboxylate, thiobenzophenone, thione-S, 4-phenyl-l,2,4-triazoline-3,5-dione, diphenyl-ketene and phenylisocyanate are added at the palladium and the enolate (a-C) carbon atoms, whereas methyl propiolate, methyl acrylate, and the methyl esters of maleic and fumaric acid form [2+3] cycloadducts with the «-carbon and the imino carbon atoms of the enolates under mild conditions. The structures of seven cycloadducts were determined by X-ray diffraction analyses.

June 2, 2014

Metallkomplexe mit biologisch wichtigen Liganden, CXX [1]. Halbsandwich-Komplexe von Ruthenium(II) und Iridium(III) mit 3-(3-Pyridyl)-D-alaninat

Katharina Haas, Heinrich Nöth, Wolfgang Beck

Page range: 989-992

Abstract

The reactions of the chloro bridged complexes [(ρ-cymene)RuCl 2 ] 2 and [(C 5 Me 5 )IrCl 2 ] 2 with the anion of 3-(3-pyridyl)-D-alanine (L) afford the N,O-chelate complexes (p-cymene)- Ru(L)(Cl) (1) and (C 5 Me 5 )Ir(L)(Cl) (2). Abstraction of chloride from 1 and 2 using AgSbF 6 gives the dimers [(ρ-cymene)Ru(μ-L) 2 Ru(ρ-cymene)] 2+ (SbF 6 ) 2 (3) and [(C 5 Me 5 )Ir(μ-L) 2 - Ir(C 5 Me 5 )] 2+ (SbF 6 ) 2 (4) with coordination of the pyridine N atom. Complex 4 is formed in high diastereomeric excess. The structure of (C 5 Me 5 )Ir(μ-L) 2 Ir(C 5 Me 5 )]Cl 2 (5) which contains the S Ir R C R C R Ir diastereoisomer in the crystal was determined by X-ray diffraction.

June 2, 2014

Metallboranate und Boranatometallate, 25. ²⁵Mg-Kernresonanzuntersuchungen an Magnesiumboranaten [1]

Heinrich Nöth, Gerhard E. W. J. Wagner

Page range: 993-998

Abstract

25 Mg NMR spectroscopy has been used to study the solution behaviour of Mg(BH 4 ) 2 · 3 THF, RMg(BH 4 ) · nL (L = various ethers) and ROMg(BH 4 ) · nL. While the solution state of Mg(BH 4 ) 2 ·3 THF remains unchanged in THF or benzene, Schlenk type equilibria are observed for RMg(BH 4 ) compounds. At low temperatures Mg(BH 4 ) 2 · nL and MgR 2 · nL are the preferred constituents in solution. In contrast, the dimeric ROMg(BH 4 ) compounds do not disproportionate into Mg(OR) 2 · nL and Mg(BH 4 ) 2 · nL.

June 2, 2014

Kristallstruktur, Infrarot- und Ramanspektren sowie thermische Zersetzung von Magnesiumtetrahydrogendimesoperiodat, MgH₄I₂O₁₀ · 6H₂O

R. Nagel, M. Botova, G. Pracht, E. Suchanek, M. Maneva, H. D. Lutz

Page range: 999-1008

Abstract

Crystal structure, DRIFT, infrared and Raman spectra, and the results of thermal analyses of the hitherto wrongly as Mg(H 4 IO 6 ) 2 · 4H 2 0 and Mg(IO 4 ) · 8H 2 O described dimesoperiodate MgH 4 I 2 O 10 · 6H 2 O and of the isostructural zinc compound are presented. The compounds crystallize in the monoclinic space group P2 1 (Z = 2) with a = 1071.0(2), b = 547.0(1), c = 1194.9(2) pm, and β = 112.58(3)° and a = 1073.3(3), b = 545.3(2), c = 1188.3(5) pm, and β = 112.52(3)°, respectively. The structure, which was refined from X-ray single crystal data of the magnesium compound (R1 = 2.72%, 3824 independet reflections), is built up from isolated distorted M(H 2 O) 6 2+ octahedra and dimesoperiodate ions H 4 I 2 O 10 2- connected by a network of hydrogen bonds formed by the H 4 I 2 O 10 2- ions and six crystallographically different hydrate H 2 O molecules. The strength of the hydrogen bonds ranges from unusually weak bonds corresponding to uncoupled (isotopically dilute samples) OD stretching modes of > 2600cm -1 and very strong ones (ν OD : < 2200 cm -1 ). The IO stretching modes of the transconfigurated H 4 I 2 O 10 2- ions are assigned to terminal I-O groups (816 cm -1 ), I-OH groups (746 and 762cm -1 ) and bridging I-O groups (618 and 647cm -1 ). On heating, MgH 4 I 2 O 10 · 6H 2 O undergoes dehydration in the range of 373 - 485 K (Differential Scanning Calorimetry) to two different polymorphs of magnesium metaperiodate (H 4 I 2 O 10 2- →2IO 4 - + 2H 2 O). Anhydrous Mg(IO 4 ) 2 is instable. Above 423 K (high-temperature Raman data), it decomposes to magnesium iodates.

June 2, 2014

Kristallstrukturen, Schwingungsspektren und Normalkoordinatenanalyse von cis-(n-Bu₄N)₂[ReBr₄(NCS)(SCN)], trans-(n-Bu₄N)₂[ReBr₄(NCS)(SCN)] und trans-(n-Bu₄N)₂[ReBr₄(NCSe)(SeCN)]

L. Homolya, W. Preetz

Page range: 1009-1014

Abstract

The crystal structures of cis-(n-Bu 4 N) 2 [ReBr 4 (NCS)(SCN)] (1) (monoclinic, space group P2 1 /n, a = 11.203(3), b = 11.738(5), c = 35.218(7) Å, β = 93.434(4)°, Z = 4), trans-(n-Bu 4 N) 2 [ReBr 4 (NCS)(SCN)] (2) (monoclinic, space group P2 1 /n, a = 11.644(7), b = 13.695(3), c = 29.028(8) Å, β = 95.96(4)° Z = 4) and trans-(n-Bu 4 N) 2 [ReBr 4 (NCSe)(SeCN)] (3) (monoclinic, space group P2 1 /n, a = 11.894(2), b = 13.737(2), c = 28.869(7) Å, β = 96.98(10)° Z = 4) have been determined by single crystal X-ray diffraction analysis. Based on these molecular parameters the low temperature (10 K) IR and Raman spectra of the (n-Bu 4 N) salts have been assigned by normal coordinate analysis. The valence force constants are f d (ReN) = 1.70 (1), 1.75 (2) and 1.75 (3), f d (ReS) = 1.32 (1) and 1.37 (2) and f d (ReSe) = 1.20 mdyn/Å (3).

June 2, 2014

Serendipitous Formation of the Cyclic Sulfite DIMTH(SO₃) by Reaction of DIMTH(OH)₂ with SOCl₂

Carsten Handrosch, Frank W. Heinemann, Horst Kisch

Page range: 1015-1018

Abstract

The reaction of the acetonide protected derivative of tartaric acid, DIMTH(OH) 2 (1) (1,6-didesoxy- 3,4-O-isopropylidene-2,5-di-C-methyl-threo-hexitol), with SOCl 2 /NEt 2 does not lead to the expected dichlorinated species 2, but affords the cyclic sulfite DIMTH(SO 3 ) (3) ((1R, 7R)-9,9-dimethyl-4-oxide-2,2,6,6-tetramethyl-4-thia-3,5,8,10-tetraoxabicyclo-[5,3,0] decane) as indicated by X-ray structural analysis.

June 2, 2014

Neue Tetraaminophosphonium-Salze durch Anionenaustausch in flüssigem Ammoniak

Kai Landskron, Stefan Horstmann, Wolfgang Schnick

Page range: 1019-1026

Abstract

[P(NH 2 ) 4 ]Br and [P(NH 2 ) 4 ][NO 3 ] have been prepared by anion exchange in liquid ammonia. Single crystals of [P(NH 2 ) 4 ]Br were obtained from an acetonitrile solution in a temperature gradient between 60 °C and room temperature while attempts to grow single crystals of [P(NH 2 ) 4 ][NO 3 ] yielded [P(NH 2 ) 4 ][NO 3 ](OP(NH 2 ) 3 ). Both crystal structures were determined by single crystal X-ray methods at room temperature ([P(NH 2 ) 4 ]Br: P4/nbm, a = 809.2(1), c = 468.1(1) pm, Z = 2, R1 = 0.042, wR2 = 0.077; [P(NH 2 ) 4 ][NO 3 ](OP(NH 2 ) 3 ): Pna2 1 , Z = 4, a = 1023.4(1), b = 1704.7(1), c = 618.0(1) pm, R1 =0.025, wR2 = 0.067. In the solid [P(NH 2 ) 4 ]Br forms a tetragonally distorted variant of the CsCl type of structure. [P(NH 2 ) 4 ][NO 3 ](OP(NH 2 ) 3 ) consists of [P(NH 2 ) 4 ] + cations, [NO 3 ] - anions, and OP(NH 2 ) 3 molecules which are interconnected by a complex system of hydrogen bonds.

June 2, 2014

The Crystal Structure of N,N′-Bis-(1,3-dihydroxy-2-methylprop-2-yl)- pyrazine-2,3-dicarboxamide Semihydrate

Kurt O. Klepp, Alan S. Cuthbertson, Peter M. Fischer, Jessie Sandoshamb, Michael Hartmann, Johann Hiebl, Hermann Kollmann, Peter Kremminger, Franz Rovenszky

Page range: 1027-1032

Abstract

Crystals of the title compound were obtained by recrystallization of N,N′-bis-( 1,3-dihydroxy- 2-methylprop-2-yl)-pyrazine-2,3-dicarboxamide in aqueous methanol. C 14 H 22 N 4 O 6 · 1/2H 2 O crystallizes in the triclinic system, s.g. P1̄ (No. 2) with a = 9.339(4) Å, b = 13.218(9) Å, c = 14.5137(9) Å, α = 70.95(4)°, β = 87.66(4)°, ɣ = 87.13(4)°, Z = 4. Its crystal structure has been determined from diffractometer data and refined to a conventional R of 0.050 (4008 observations, 464 variable parameters). The structure contains two crystallographically independent molecules which are alternatingly stacked above each other along the [001]-direction. Extensive intermolecular hydrogen bonding between these stacks leads to the formation of slabs parallel to (010). The hydrate water is only loosely attached to one of the molecules and has no apparent influence on the stacking.

June 2, 2014

β-Diketonates and their Analogs: Stabilization of the Dimeric M₂{L}₄(D)₂ (M = Co, Ni) Core in the Complexes with Dimethyl-N-trichloroacetylamidophosphate {Cl₃C(O)NP(O)(OCH₃)₂}^-

Elizaveta A. Bundya, Vladimir M. Amirkhanov, Vladimir A. Ovchynnikov, Victor A. Trush, Konstantin V. Domasevitch, Joachim Sieler, Victor V. Skopenko

Page range: 1033-1038

Abstract

The coordination compounds of general formula [M{X} 2 (2-propanol)] 2 (M = Co(II) (1), Ni(II) (2); {X} = Cl 3 CC(O)NP(O)(OCH 3 ) 2 ) have been prepared and characterized by means of IR, UV-VIS spectroscopy and X-ray analysis. The compounds are isomorphous according to X-ray powder diffraction studies. Crystal data for 1: triclinic, P1̄, with a = 9.510(2), b = 12.053(2), c = 23.594(5) Å ,a = 84.74(3), b = 86.47(3), g = 75.45(3)°, Z = 2, V = 2604.7(9) Å 3 , R1 = 0.067, wR2 = 0.143 for 6299 unique reflection used). The complex adopts a dimeric centrosymmetric molecular array with Co-O-Co bridges formed via the oxygen atoms of phosphoryl groups. This structure is stabilized by intradimeric hydrogen bonds of the type P = O---H with the coordinated 2-propanol. The metal atoms are coordinated in slightly distorted octahedra (Co-O 2.050(5)-2.140(5) Å). Unlike the β-diketonate compounds of similar structure, the dimeric complexes are stable towards donor species and in 2-propanol solution.

June 2, 2014

Synthesis and Electronic Spectra of Tricarbonylrhenium(I) Chloride Complexes with 9,10-Phenanthrenequinone and 9,10-Phenanthrenequinone Diimine as Acceptor Ligands

Markus Leirer, Günther Knör, Amd Vogler

Page range: 1039-1041

Abstract

The complexes Re(L-L)(CO) 3 Cl with L-L = 9,10-phenanthrenequinone (PHQ) and 9,10- phenanthrenequinone diimine (PHI) were prepared and characterized spectroscopically. Both compounds show intense Re(I) to L-L metal-to-ligand charge transfer (MLCT) absorptions. In chloroform, the MLCT bands appear at 711 nm (L-L = PHQ) and 553 nm (L-L = PHI).

June 2, 2014

Synthesis of Benzisochalcogenol and -azole Derivatives via ortho Metalation of Isophthalamides

Berthold Kersting, Michael DeLion

Page range: 1042-1047

Abstract

The syntheses of benzofused isochalcogenazole derivatives via ortho-lithiation of isophthalamides is reported. N ,N′ -Dialkyl-isophthalamides, C 6 H 4 -1,3-(CONHR) 2 , bearing R = iPr or tBu substituents are readily ortho metalated by using 3.3 equiv. of n-BuLi/TMEDA. The organo lithium compounds react with S, Se, or Te to give 2-chalcogenol-isophthalamides, C 6 H 3 -1,3- (CONHR) 2 -2-XH (X = S, Se, Te). Oxidation of the chalcogenols affords dichalcogenides under acidic and benzisochalcogenazoles under basic conditions, respectively. The formation of the five-membered heterocycles proceeds by disproportionation of the dichalcogenides. Oxidation of the benzisothiazoles by hydrogen peroxide gives access to substituted sulfin- and sulfonamides.

June 2, 2014

Synthesis, Reactions and Spectroscopy of 3-Benzoyl-6-phenylpyridazines of Expected Biological Activity

Yvette A . Issac

Page range: 1048-1054

Abstract

yielded 3-benzoyl-6-phenylpyridazine (2). Phenyl(6-phenyl-pyridazin-3-yl)methanol (3) has been obtained via NaBH 4 reduction of ketone 2. Reaction of 2 with hydroxylamine or its O-alkyl analogue has been found to yield 3-benzoyloxime-6-phenylpyridazine (4) and alkyloximes (5), respectively. Treatment of 4 with a mixture of acetic acid and sulfuric acid afforded ketone 2 again and not the rearranged products (6 or 7). Beckmann rearrangement has however been achieved for 3-benzoyl(O-ethyloxime)-6-phenylpyridazine (5a) and oxime 4 giving solely 3-carboxanilide-6-phenylpyridazine (6), 4-Benzoyloxime-3-phenyl-6-chloropyridazine (17) has been synthesized from the corresponding ketone 16.

June 2, 2014

Imidazole Nucleosides, V. Synthesis of 3′-Fluoro-3′-deoxy-ribofuranosides of 4(5)-Amino-imidazoIe-5(4)carboxamide

Hans Guglielmi, Markus Dachtler, Klaus Albert

Page range: 1055-1060

Abstract

The synthesis of the 3′-fluoro-derivatives of 5-amino-1-(β-D-ribofuranosyl)imidazole-4- carboxamide (AICA-riboside) and the isomeric 4-amino-1(β-D-ribofuranosyl)imidazole-5- carboxamide (iso-AICA-riboside) are described. Structures were confirmed by elemental analysis, UV and 1 H NMR spectroscopy. The anti-viral and anti-cancer activities of these imidazole nucleosides were tested.

June 2, 2014

Synthetic Potential Inherent in D-Isoascorbic Acid as a Precursor for Pyridazine and Furo[3,2-c]pyridazine Ring Systems with Two Asymmetric Centers

E. S. H. El Ashry, L. F. Awad, H. Abdel Hamid, Y. El Kilany

Page range: 1061-1067

Abstract

Reaction of D-erythro-2,3-hexodiulosono-1,4-lactone-2,3-bis(phenylhydrazone) (2) with an iodine, triphenylphosphine and imidazole mixture afforded the furo[3,2-c]pyridazine derivative 11. Condensation of 6-bromo-6-deoxy-D-erythro-2,3-hexodiulosono-1,4-lactone with phenylhydrazine gave the bishydrazones 6, and 8 or the furo[3,2-c]pyridazine (11) depending on the reaction conditions. The lactone ring in 11 could be opened by treatment with alkali to give the pyridazine derivative 9. Lactonization of the later with simultaneous acetylation by acetic anhydride afforded the lactone derivative 14. Alkali treatment of 6 gave the pyrazolindione derivative 13 that gave upon reation with HBr/AcO H the dibromide 15. The assigned structures were based on spectral analysis. The activity of compounds 11 and 14 against hepatitis B virus has been studied.

June 2, 2014

Chiral Pool Synthesis of 4a-Substituted Carbocyclic Cyclopentanoid Nucleoside Precursors, I

René Csuk, Petra Dörr, Martin Kühn, Claus Krieger, Mikhael Y. Antipin

Page range: 1068-1078

Abstract

A suitable protected D-ribono-1,4-lactone derivative has been used for the straightforward chiral pool synthesis of cyclopentanoid nucleoside precursors. Thus, epoxidation followed by deoxygenation or regioselective ring opening led to nucleoside precursors modified at the positions C(4), C(4a) and C(4,4a) as well as side-chain modified derivatives. The structures of the key intermediates were determined by X-ray analyses.

June 2, 2014

Chiral Pool Synthesis of 4a-Substituted Carbocyclic Cyclopentanoid Nucleoside Precursors, II

René Csuk, Petra Dörr, Martin Kühn, Claus Krieger, Hermann Irngartinger, Thomas Oeser, Mikhael Yu. Antipin

Page range: 1079-1091

Abstract

Suitable protected 4,4a-anhydro-cyclopentane derivatives have been used for the straightforward of cyclopentanoid nucleoside precursors. Thus, by simple transformations nucleoside precursors modified at the positions C(4), C(4a) and C(4,4a) as well as side-chain modified derivatives were accessible. The structures of the key intermediates were determined by xray analyses.

June 2, 2014

Die Kristallstruktur von Bis(bromotriphenyl) arsen(V)-hexabromotellurat( IV), [Ph₃AsBr]₂[TeBr₆]

Soheila Chitsaz, Bernhard Neumüller, Kurt Dehnicke

Page range: 1092-1094

Abstract

Yellow-orange single crystals of [Ph 3 AsBr] 2 [TeBr 6 ] have been prepared from saturated solutions of Ph 3 AsBr 2 and TeBr 4 in acetonitrile and characterized by a crystal structure determination. Space group R3̄c, Z = 12, lattice dimensions at -70 °C: a = b = 1337.9(2), c = 7953.8(4) pm, R = 0.0691. The structure consists of discrete ions [Ph 3 AsBr] + and nearly perfectly octahedral [TeBr 6 ] 2- .

June 2, 2014

Darstellung und Kristallstruktur von Hexacaesium-hexatelluridodigermanat( III) (Cs₆Ge₂Te₆)

Bernd Friede, Martin Jansen

Page range: 1095-1098

Abstract

The new compound hexacaesium hexatellurido digermanate(III), Cs 6 Ge 2 Te 6 , has been prepared by reacting the elements in a stoichiometric ratio at 923 K in an evacuated silica glass tube. The title compound crystallizes as black columns and is isostructural to K 6 G e 2 Te 6 (C2/c, a = 17.027(2), b = 14.237(1), c = 10.104(1) Å, β = 96.701(8)°, Z = 4 (5130 reflections, R1 (I > 2 σ (I)) = 0.042). The structure ist composed of isolated distorted Te 6 octahedra, with Ge-Ge dumbbells at the centres. The caesium cations are arranged between the isolated Ge 2 Te 6 octahedra. The Ge-Ge bond lengths in A 6 Ge 2 Te 6 (A = alkali metal) increase significantly as the counter ions are varied from sodium to caesium.

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Zeitschrift fuer Naturforschung B (ZNB) publishes novel research in all areas of inorganic chemistry, organic chemistry, and analytical chemistry. In particular, the journal focuses on solid state chemistry, coordination chemistry, main group element chemistry, synthetic organic chemistry, natural product chemistry and, to a lesser extent, on analytical chemistry. For more than 65 years Zeitschrift fuer Naturforschung B has been open to contributions from all fields of experimental and theoretical chemistry. Zeitschrift fuer Naturforschung B publishes 12 issues per volume/year. Sometimes double issues occur.

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Solid state chemistry
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Natural product chemistry

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Volume 54 Issue 8

Issue of Zeitschrift für Naturforschung B

Darstellung und Eigenschaften von Tetra(n-butyl)ammonium-cis-diacidooxophthalocyaninato( 2-)niobaten(V) und -tantalaten(V); Kristallstruktur von (nBu4N)CIS[Nb(F)2Opc2-]

Abstract

Metallkomplexe mit biologisch wichtigen Liganden, CXXI [1]. Orthopalladierte Enolate aus N-(Diphenylmethylen)-Schiff-Basen von a-Aminosäureestern als ambivalente 1,3-Dipole in [2+3]-Cycloadditionsreaktionen. Strukturen einer Reihe von Cycloaddukten

Abstract

Metallkomplexe mit biologisch wichtigen Liganden, CXX [1]. Halbsandwich-Komplexe von Ruthenium(II) und Iridium(III) mit 3-(3-Pyridyl)-D-alaninat

Abstract

Metallboranate und Boranatometallate, 25. 25Mg-Kernresonanzuntersuchungen an Magnesiumboranaten [1]

Abstract

Kristallstruktur, Infrarot- und Ramanspektren sowie thermische Zersetzung von Magnesiumtetrahydrogendimesoperiodat, MgH4I2O10 · 6H2O

Abstract

Kristallstrukturen, Schwingungsspektren und Normalkoordinatenanalyse von cis-(n-Bu4N)2[ReBr4(NCS)(SCN)], trans-(n-Bu4N)2[ReBr4(NCS)(SCN)] und trans-(n-Bu4N)2[ReBr4(NCSe)(SeCN)]

Abstract

Serendipitous Formation of the Cyclic Sulfite DIMTH(SO3) by Reaction of DIMTH(OH)2 with SOCl2

Abstract

Neue Tetraaminophosphonium-Salze durch Anionenaustausch in flüssigem Ammoniak

Abstract

The Crystal Structure of N,N′-Bis-(1,3-dihydroxy-2-methylprop-2-yl)- pyrazine-2,3-dicarboxamide Semihydrate

Abstract

β-Diketonates and their Analogs: Stabilization of the Dimeric M2{L}4(D)2 (M = Co, Ni) Core in the Complexes with Dimethyl-N-trichloroacetylamidophosphate {Cl3C(O)NP(O)(OCH3)2}-

Abstract

Synthesis and Electronic Spectra of Tricarbonylrhenium(I) Chloride Complexes with 9,10-Phenanthrenequinone and 9,10-Phenanthrenequinone Diimine as Acceptor Ligands

Abstract

Synthesis of Benzisochalcogenol and -azole Derivatives via ortho Metalation of Isophthalamides

Abstract

Synthesis, Reactions and Spectroscopy of 3-Benzoyl-6-phenylpyridazines of Expected Biological Activity

Abstract

Imidazole Nucleosides, V. Synthesis of 3′-Fluoro-3′-deoxy-ribofuranosides of 4(5)-Amino-imidazoIe-5(4)carboxamide

Abstract

Synthetic Potential Inherent in D-Isoascorbic Acid as a Precursor for Pyridazine and Furo[3,2-c]pyridazine Ring Systems with Two Asymmetric Centers

Abstract

Chiral Pool Synthesis of 4a-Substituted Carbocyclic Cyclopentanoid Nucleoside Precursors, I

Abstract

Chiral Pool Synthesis of 4a-Substituted Carbocyclic Cyclopentanoid Nucleoside Precursors, II

Abstract

Die Kristallstruktur von Bis(bromotriphenyl) arsen(V)-hexabromotellurat( IV), [Ph3AsBr]2[TeBr6]

Abstract

Darstellung und Kristallstruktur von Hexacaesium-hexatelluridodigermanat( III) (Cs6Ge2Te6)

Abstract

Darstellung und Eigenschaften von Tetra(n-butyl)ammonium-cis-diacidooxophthalocyaninato( 2-)niobaten(V) und -tantalaten(V); Kristallstruktur von (ⁿBu₄N)^CIS[Nb(F)₂Opc^2-]

Metallboranate und Boranatometallate, 25. ²⁵Mg-Kernresonanzuntersuchungen an Magnesiumboranaten [1]

Kristallstruktur, Infrarot- und Ramanspektren sowie thermische Zersetzung von Magnesiumtetrahydrogendimesoperiodat, MgH₄I₂O₁₀ · 6H₂O

Kristallstrukturen, Schwingungsspektren und Normalkoordinatenanalyse von cis-(n-Bu₄N)₂[ReBr₄(NCS)(SCN)], trans-(n-Bu₄N)₂[ReBr₄(NCS)(SCN)] und trans-(n-Bu₄N)₂[ReBr₄(NCSe)(SeCN)]

Serendipitous Formation of the Cyclic Sulfite DIMTH(SO₃) by Reaction of DIMTH(OH)₂ with SOCl₂

β-Diketonates and their Analogs: Stabilization of the Dimeric M₂{L}₄(D)₂ (M = Co, Ni) Core in the Complexes with Dimethyl-N-trichloroacetylamidophosphate {Cl₃C(O)NP(O)(OCH₃)₂}^-

Die Kristallstruktur von Bis(bromotriphenyl) arsen(V)-hexabromotellurat( IV), [Ph₃AsBr]₂[TeBr₆]

Darstellung und Kristallstruktur von Hexacaesium-hexatelluridodigermanat( III) (Cs₆Ge₂Te₆)