bluuebunny/crossref_metadata_2025_split huggingface dataset:
Zur Kenntnis der hochsten Hydrate der Schwefelsaure: Bildung und Struktur von H2SO4 ·6,5 H2O und H2SO4 · 8 H2O [1] / On the Highest Hydrates of Sulfuric Acid: Formation and Structure of H2SO4-6.5 H2O and H2SO4 · 8 H2O [1]
Authors: Mootz Dietrich , Merschenz-Quack Angelika 
Published: March 2015

Abstract
The phase diagram of the system sulfuric acid-water in the range 80-100 mol % H20 was reinvestigated by low-temperature DTA and X-ray powder diffraction. The results are compared with other studies in the literature. The crystal structures of the hydrates H2SO4 · 6.5 H2O. melting incongruently at -54 °C. and H2SO4 · SH2O (metastable) were determined to be those of oxonium salts. (H5O2)(H7O1)SO4 ·1.5 H2O and (H5O2)2SO4 · 4 H2O, respectively.
Substitutionsreaktionen am N-[1-Chlor-2,2,2-trifluor-1-(trifluormethyl)ethyl]-dimethyIformamidin / Substitution Reactions with N-[1-Chloro-2,2,2-trifluoro-1-(trifluoromethyl)ethyl]-dimethylformamidine
Authors: Grützmacher Hansjörg , Roesky Herbert W. , Noltemeyer Mathias , Sheldrick George M. 
Published: March 2015

Abstract
It is difficult to achieve nucleophilic attack on a carbon atom bonded on two trifluoromethyl groups. However, N-[1-chloro-2,2,2-trifluoro-1-(trifluoromethyl)ethyl]-dimethylformamidine (1) reacts readily with H2O, MeOH, EtSH and P(OMe)3 even under mild conditions to form products 2, 3, 4 and 5. The reaction between 1 and Ph2PH is complex but leads in nearly quantitative yield to N-[2,2,2-trifluoro-1-(trifluoromethyl)ethyl]-dimethylformamidinium chloride 6 which has been characterized by an X-ray structure analysis. A reaction mechanism is proposed.
Natürliche Allergene, I. Das Auftreten von Falcarinol und Didehydrofalcarinol in Efeu (Hedera helix L.) / Natural Allergenes. I. The Occurrence of Falcarinol and Didehydrofalcarinol in Ivy (Hedera helix L .)
Authors: Bruhn Gabriele , Faasch Holger , Hahna Holger , Hausen Björn M. , Bröhan Johann , König Wilfried A. 
Published: March 2015

Abstract
From common ivy Hedera helix, subsp. helix and from Hedera helix, subsp. canariensis the highly unsaturated CI7-alcohols falcarinol (1) and the so far unknown didehydrofalcarinol (2) [(3R)-heptadeca-1,9(Z),11(Z),16-tetraene-4,6-diyne-3-ol] was isolated and its structures iden­tified by mass spectrometry and NMR. The (R)-configuration of falcarinol and didehydrofalcarinol was determined after catalytic hydrogenation to 3-heptadecanol by enantioselective capillary gas chromatography. Falcarinol and didehydrofalcarinol effect sensibilization and allergic skin reactions in minute concentrations.
Pilzfarbstoffe, 54 [1] / Fungal Pigments, 54 [1]
Authors: Jägers Elisabeth , Hillen-Maske Elisabeth , Steglich Wolfgang 
Published: March 2015

Abstract
Fruitbodies of the basidiomycete Boletopsis leucomelaena contain the leuco-peracetates of thelephoric acid and cycloleucomelone (3 and 4, respectively). The latter compound is accom­panied by a series of analogues, containing five, four, and three acetyl residues. The properties of Akagi’s “leucomelone” (1) and “protoleucomelone” (2) correspond to those of cycloleucomelone (7) and its leuco-peracetate 4.
Pilzfarbstoffe, 55 [1] / Fungal Pigments, 55 [1]
Authors: Jägers Elisabeth , Hillen-Maske Elisabeth , Schmidt Holger , Steglich Wolfgang , Horak Egon 
Published: March 2015

Abstract
Fruit-bodies of Anthracophyllum species contain acetates of cycloleucomelone, cyclovariegatin and atromentin in high concentrations. The cycloleucomelone derivatives are responsible for the green colour reaction with aqueous alkali both on surface. Cyclovariegatin has been synthesized via pyrandione intermediates.
Inhaltsstoffe aus Pseudocalymma elegans (Vell.) Kuhlm. 1. Isolierung von Allantoin, Lamiid und Sorbarin / Ingredients from Pseudocalymma elegans (Vell.) Kuhlm. 1. Isolation of Allantoin, Lamiide, and Sorbarin
Authors: Krebs Hans Chr. 
Published: March 2015

Abstract
Allantoin, the iridoid glucoside lamiide, and the flavonoide compound sorbarin could be isolated from the methanolic extract of the poisonous brazilian plant Pseudocalymma elegans. NMR data of lamiide, of its penta- and hexaacetate as well as of sorbarin are discussed.
Synthese und Bestimmung der absoluten Konfiguration von 2-Hydroxy-12-methyltridecansäure [1] / Synthesis and Absolute Configuration of 2-Hydroxy-12-methyl Tridecanoic Acid [1]
Authors: Balzer Th. , Budzikiewicz H. 
Published: March 2015

Abstract
The synthesis of racemic 2-hydroxy-12-methyl tridecanoic acid is described. The absolute configuration of the two enantiomers has been determined by the method of Dale and Mosher.
Preparation and Crystal Structure of [TeBr3][AuBr4] · 1/2 Br2, a Compound with “Bromine of Crystallization”
Authors: Freire-Erdbrügger Cristina , Jentsch Dieter , Jones Peter G. , Schwarzmann Einhard 
Published: March 2015

Abstract
The reaction between elemental gold, tellurium and bromine leads to a crystalline product of empirical formula AuBr8Te. The crystal structure determination of AuBr8Te shows that it is composed of dimeric [TeBr3 · AuBr4]2 units with secondary Te···Br interactions and of isolated Br2 molecules.
Preparation and Structural Characterization of Methylmercury(II) Complexes of 5-Aza- and 6-Azauracil Derivatives
Authors: Sheldrick W. S. , Heeb S. 
Published: March 2015

Abstract
1:1 Methylmercury(II) complexes of the anti-tumour agent 6-azauracil (6AUH2) and its deriva­tives 6-azathymine (6ATH2). 1-methyl-6-azauracil (6AMUH) and 1-methyl-6-azathymine (6AMTH) have been isolated from aqueous solutions of CH3HgOH and the respective base. N3-Coordination was established by X-ray structural analysis for both [(CH3Hg)6 AUH] (1) (pH 6-8) and [(CH3Hg)6 AMT] (5) (pH 4-12); in addition 1H NMR data are in accordance with an identical binding site in the complexes [(CH3Hg)6AMU] (3) and [(CH3Hg)6 ATH] (4). Using an excess of CH3HgOH. 2:1 complexes with N1, N3-coordination may be prepared for both 6 AUH: and 5 AUH2 in a wide pH range (4-12 and 6-12 respectively). At pH values of 3-4 a 3:1 complex [(CH3Hg)35 AU]NO3 (7), with N1, N3, N5-coordination may be isolated: the binding sites were confirmed by X-ray structural analysis. In no case could an ionic complex with N6- coordination be isolated for a 6-azapyrimidine derivative. The binding preferences of the bases are discussed in the light of MNDO calculations.
Darstellung und Oxidation von 2-(2,5-Dihydroxy-phenyl)-ethylamin-Derivaten, II / Synthesis and Oxidation of 2-(2,5-Dihydroxyphenyl)-ethylamine Derivatives, II
Authors: Kuckländer Uwe , Bastian Udo 
Published: March 2015

Abstract
2,5-Dihydroxyphenylethylamine derivatives 8a,b; 14; 19a,b and 25a,b,c are synthesized and oxidized to indole 9a, indolines 15 and 18a,b as well as 24a,b,c. Quantitative oxidation of hydroquinones yields the 2-(aminoethyl)quinones 30a as free base and 30d-f; 27a,b and the hydrochlorides 28a,b. Quinone 30a is reduced to indoline 29 and acetylated to 3-acylindole 32, transformed by heating to indole 23 and in acetic acid to the dimeric indole 31. 32 is synthesized unequivocally from 33 and 34. The course of the reaction is discussed and the formation of indolines is explained by cyclisation of a semiquinone precursor (43).
Modellreaktionen zur Plumbagin-Synthese, 2. Mitteilung 5-Amino-1-naphthol als Startkomponente / Model Reactions for Plumbagin Synthesis, 2nd Communication 5-Amino-1-naphthol as Starting Compound
Authors: Möhrle Hans , Folttmann Hubertus 
Published: March 2015

Abstract
The aminomethylation of 5-amino-1-naphthol (1) and 5-acetamido-1-naphthol (9) is examined. While the hydrogenolysis of the phenol Mannich bases derived from 1 cannot be accomplished, the derivatives of 9 react easily. The oxidation of the 2-methylphenol compounds 5 and 18 to the corresponding quinones may performed with Fremy's salt. The following transforming of the amino to the hydroxy group by nitrosylsulfuric acid succeeds with small yield only.
Der 2,4,6-Triisopropylbenzolsulfonyl(Tip)-Rest, eine neue Schutzgruppe für die Guanidinofunktion von Arginin / The 2,4,6-Triisopropylbenzenesulfonyl Residue, a New Protecting Group for the Guanidino Function of Arginine
Authors: Echner Hartmut , Voelter Wolfgang 
Published: March 2015

Abstract
The 2.4.6-triisopropylbenzenesulfonyl group is introduced in high yield into the guanidino function of arginine by the reaction of Na-protected arginine with 2.4.6-triisopropylbenzene-sulfonyl chloride. This protecting group was found to be cleaved by commonly used reagents used in peptide synthesis like methanesulfonic, trifluoromethanesulfonic acid or mixtures of tri-fluoroacetic with methanesulfonic or trifluoromethanesulfonic acid.
Acetalisierte Formylmangan-Komplexe / Acetals of Formyl Manganese Complexes
Authors: Löwe Christiane , Huttner Gottfried , Zsolnai Laszlo , Berke Heinz 
Published: March 2015

Abstract
Acetal complexes of the type (OC)5 MnCH(XR)2 , RX = PhO (1a), (RX)2 = 1,2-dioxybenzene (1b), (RX), = S-(CH2)3-S (2) and

(5) were synthesized. Glyoxyloyl acetal derivatives (OC)5 MnC(O)CH(XR)2, RX = PhO (3a), (RX)2 = 1,2-dioxybenzene (3b), (RX)2 = S-(CH2)3-S (4) were obtained by the action of NaMn(CO)5 upon the corresponding acid chlorides or anhydrides, la can be transformed to 3a by CO insertion, 1a has been characterized by an X-ray structure determination.
Darstellung und Struktur des Bis(triphenylarsoranyliden)ammoniumchlorids / Preparation and Structure of Bis(triphenvlarsoranylidene) Ammonium Chloride
Authors: Roesky Herbert W. , Bertel Nobert , Edelmann Frank , Noltemeyer Mathias , Sheldrick George M. 
Published: March 2015

Abstract
The reaction of Ph3AsCl2 (1) and N(SiMe3)3 (2) yields [Ph3As-N-AsPh3]+Cl (3) as a crystal­line white solid, soluble in CH3OH and acetone. 3 might be used to stabilize unusual anions. It crystallizes as a 1:1 toluene adduct in the space group C2/c with a - 1585.3(3). b = 1058.7(2). c = 2266.3(4) pm. β = 94.40(2)° and Z = 4. The cation in 3 lies on a crystallographic two-fold axis with As-N-As 123.9(1)°. As-N 174.9(3). and As-C 196.7(5). 197.6(5). 193.2(5) pm.
Eine schnelle Methode zur quantitativen Abtrennung von Chlor und Brom aus sauren wäßrigen Lösungen / A Rapid Method for the Quantitative Elimination of Chlorine or Bromine from Aqueous Acidic Solutions
Authors: Baumgärtner Wolfram , Gawargious Youssef A. , Brodersen Klaus 
Published: March 2015

Abstract
The quantitative elimination of chlorine and bromine from acidic aqueous solutions was achieved through extraction with a dilute solution of styrene in CCl4 .
Schwingungs-und Elektronenspektren der bindungsisomeren Hexakis(thiocyanato(N)-thiocyanato(S))-osmate(III) und (IV) / Vibrational and Electronic Spectra of Bond-Isomeric Hexakis(thiocyanato(N)-thiocyanato(S))osmates(III) and (IV)
Authors: Bütje K. , Preetz W. 
Published: March 2015

Abstract
Well-resolved IR and Raman spectra of the two sets of all 10 isomeric complexes [Os(NCS)n(SCN)6-n]3-/2-, n = 0-6, have been recorded. For both series, νCS(N) > νCS(S) and δNCS > δSCN; for the Os(III) complexes, vCN(N) ~ vCN(S) and vOsN ≥ vOsS while for the Os(IV) compounds, vCN(N) < vCN(S) and vOsN ~ vOsS. The vibrational spectra of the n = 0 and n = 6 members of both sets are assigned according to D3d and Oh point symmetry, respectively. For the mixed linkage isomers the band pattern is strongly influenced by pseudo-octahedral coupling wherever frequencies of N- and S-bonded groups coincide. The metal-ligand stretching region is therefore assigned according rather to pseudo-Oh, pseudo-D3d and pseudo-D4h symmetry than to D4h, C4v, C3v and C2v microsymmetry. The charge-transfer spectra of both series are similar, showing a parallel hypsochromic shift with increasing n value. Upon oxidation, a bathochromic shift of the CT bands by an average of 5400 cm-1 is observed, and the intensity increases by a factor 2-2.5. Weak absorptions in the near infrared region are assigned to intraconfigurational transitions.
Metall-Komplexe mit S4N4 -Liganden: Die Strukturen von zwei Komplexen der Zusammensetzung [TiCl4(S4N4)]2 / Metal Complexes with S4N4 Ligands: The Structures of Two Complexes of Composition [TiCl4(S4N4)]2
Authors: Thewalt Ulf , Holl Konrad 
Published: March 2015

Abstract
Slow reaction of TiCl4 with S4N4 in CH2Cl2/CCl4 produces a mixture of two crystalline dinuclear complexes of composition [TiCl4(S4N4)]2. Crystal data for the orange-yellow α-isomer: mono­clinic, space group P21/n with a = 11.608(3) Å. b = 8.304(3) Å, c = 10.938(5) Å, β = 101.06(4)° and Z = 2. Crystal data for the red-brown β-isomer: monoclinic, space group P21/c with a = 11.220(2) Å, b = 13.868(2) Å, c = 14.839(4) Å, β = 106.18(2)° and Z = 4. Crystal structure analyses reveal that the S4N4 molecules in the α-form act as 1,3-N,N′-bonded bridging ligands and in the β-form as N-bonded monodentate ligands.
ESCA Studies of N,N′-Thiobisamines and of Some of its Chromium Carbonyl Complexes
Authors: González G. , Díaz C. , Binder H. 
Published: March 2015

Abstract
The X-ray photoelectron spectra of some N,N′-thiobisamines and of two of its complexes with Cr(CO)5 have been studied. The S(2p) binding energies are found to correlate with the effective nuclear charge on the sulfur atom as well as with the double bond character of the S-N linkage. The effect of the coordination on the N(1s) and S(2p) binding energies agree with sulfur coordination as well as with a π acceptor behaviour characteristic for thiobisamine ligands.
Darstellung und Kristallstruktur von Cäsiumhydroxid mit Methanol CsOH · CH3OH / Properties and Crystal Structure of Cesium Hydroxide with Methanol CsOH · CH3OH
Authors: Marx Rupert 
Published: March 2015

Abstract
Cesium hydroxide methanol, CsOH·CH3OH, was obtained by recrystallising CsOH·H2O in a mixture of liquid ammonia and methanol in sealed quartz ampoules. The colourless, air sensitive crystals are hexagonal (space group P63/m) with a = 1362 pm, c = 430 pm, Z = 6. A structural model derived by Patterson methods was refined to R = 0.033. The structure comprises of trigonal prismatic columns of Cs+ and hydrogen bonded chains of OH- and CH3OH along the c-axis. This leads to the tricapped prisms filled with Cs+ and hydrophobic channels formed by the CH3 groups.
Über die Reaktivität von [(CH3)2N]6W2 (W≡W) gegenüber CS2/S8 und CS2/Se8. Röntgenstrukturanalyse von [(CH3)2NCS2]2W(S)(S2) / Reactivity of [(CH3)2N]6W2 (W≡W) Towards CS2/S8 and CS2/Se8. X-Ray Structure Analysis of [(CH3)2NCS2]2W(S)(S2)
Authors: Ziegler Manfred L. , Blechschmitt Klaus , Bock Harald , Guggolz Ernst , Korswagen Richard P. 
Published: March 2015

Abstract
In this paper we report two improved preparation methods for [(CH3)2N]6W2 (W≡W) (1), one starting from WCl4 (yield 51%), and a second one starting from W2C16(THF)4 (ca. 60% yield). We have studied the reactions of 1 with different nucleophiles, among them triphenylalkylidenphosphoranes (like Ph3P=CH2 and Ph3P=CHPh·LiCl; Ph = phenyl), sulfur and CS2 .
1 reacts with S8 and CS2 in hexane to yield the two new compounds (Me2NCS2)2WS(S2) (4) and W(CS2H)(Me2NCS2)2 (5), both containing dithiocarbamato ligands formed by insertion of CS2 into the W-N bond. The two mononuclear compounds were characterized spectroscopically, in the case of 4 an X-ray diffraction structure analysis was performed. The reaction of 1 with Se and CS2 , leads to the compounds 4, (Me2NCS2)2W2S4 (6) and [(Me2N)2C]CS2 (7), which were also characterized spectroscopically. No Se-containing compounds could be isolated.
4 crystallizes monoclinically, C5
2h-P21/n, with a = 648.6(3), b = 1346.7(6) and c = 1745.9(7) pm, β = 91.85(3)°, V = 1524x106 pm3 , Z = 4. The structure of the seven-coordinate tungsten compound is discussed and compared to complexes with similar ligands and geometry.
The Electrochemical Synthesis of Neutral Zinc(II) Complexes of Schiff Base Ligands: The Crystal Structure of Bis[N-(4-methylphenyl)salicylaldiminato]zinc(II)
Authors: Sogo T. , Romero J. , Sousa A. , Blas A. de , Durán M. L. , Castellano E. E. 
Published: March 2015

Abstract
The electrochemical synthesis and physico-chemical properties of neutral zinc(II) complexes of bidentate Schiff bases derived from salicylaldehydes are presented together with the X-ray structure of bis[N-(4-methylphenyl)salicylaldiminato]zinc(II). The crystal is monoclinic, a = 21.877(3), b = 8.801(2), c = 12.027(5) Å, β = 96.55(3)°, space group C2/c. The complex is a monomer, and the zinc atom is tetrahedrally coordinated.
Allo-Verbindungen mit ungewöhnlichem Verhalten bei der Gaschromatographie an chiraler stationärer Phase / Allo-Compounds with Unusual Behaviour in Gas Chromatography Using Chiral Stationary Phase
Authors: Küsters Ernst , Rahmen Willy 
Published: March 2015

Abstract
The Separation of the enantiomers of D,L-allo-threoninol, necessary in racemization studies of peptide hydrolysates, gave a surprising result with respect to the elution series of the antipodes. Contrary to the rule (L before D on Chirasil-L-Val) D-allo-threoninol is eluted before its mirror image. This behaviour can only be explained by the differing importance of the asymmetric centres contained in the molecule. As a result of this and taking into account the chromatographic behaviour of allo-compounds refined model concepts of enantiomer separation must be devel-oped in future.
The separation of allo-compounds of threonine, isoleucine and cystathionine is considered from this aspect.
Evaluation of the 2 NH2A—T Pair in Hybridization, I Synthesis of the DNA/RNA Hybrid Oligomers Containing 2-Aminoadenosines
Authors: Kikuchi Kaeko , Taniyama Yoshio , Marumoto Ryuji 
Published: March 2015

Abstract
DNA decamers containing 2-aminoadenosine were synthesized. Oligonucleotide duplexes including the 2 NH2A-T base pairs were prepared and their Tm profile examined. Contrary to expectation, elevation of the Tm value by the 2 NH2 group is very small in DNA/RNA duplexes. From the CD spectra measurement, we assume that the distortion of the B-DNA structure caused by scattered DNA/RNA base pairing diminishes the efficient hydrogen bonding and base stacking of the duplexes. It was also found that the DNA duplexes containing 2-aminoadenosine hybrids are considerably resistant to ribonuclease T2 or nuclease P1 digestion.
Zur Struktur der Kupfer-Weberite Na2CuCrF7 und Na2CuFeF7 / Concerning the Structures of the Copper Weberites Na2CuCrF7 and Na2CuFeF7
Authors: Kummer S. , Massa W. , Babel D. 
Published: March 2015

Abstract
The crystal structure of the compound Na-CuCrF7 (orthorhombic, a = 710.0, b = 1033.8, c = 751.8 pm, Z = 4) was refined in space group Pmnb to Rg= 0.028 (1545 independent reflections). The Jahn-Teller distortion of the CuF6 -octahedra (Cu-F = 191.1/193.8/212.4 pm. mean 199.1 pm) reduces the symmetry compared to the body-centered orthorhombic weberite type, to which it is otherwise closely related. The CrF6 -octahedra. interconnecting parallel chains of CuF6 -octahedra, are nearly undistorted (mean Cr-F = 190.6 pm). Na2CuFeF7 exhibits a supercell with a different structure (monoclinic, a = 2468.7, b = 734.7, c = 1245.2 pm, β = 99.29°, Z = 16). It may be interpreted as a new intermediate type between orthorhombic and trigonal weberites. Preliminary results obtained from refinement in space group A2/n (Rg = 0.076) are given and discussed (mean values Cu-F = 199 pm, Fe - F = 192 pm).
Ketenylidentriphenylphosphoran-Komplexe / Ketenylidenetriphenylphosphorane Complexes
Authors: Lindenberger Heide , Birk Reiner , Orama Olli , Huttner Gottfried , Berke Heinz 
Published: March 2015

Abstract
Ketenylidenetriphenylphosphorane complexes of the type LnMC(CO)PPh3 LnM = CpMn(CO)2 (2a), CpRe(CO)2 (2b) and Fe(CO)4 (3) are obtained by CO substitution reactions. The synthesis of 3 at 80 °C is accompanied by the formation of a Fe2(CO)6 compound with a bridging α-metallated formyl(triphenylphosphane)carbido ligand. From ethylation of 3 arises an Fe2(CO)6 ferrol-type complex 5.
N,N′-Bis(diphenyIphosphino)-S,S-dimethylsulfodiimin – ein Ligand für cyclische Übergangsmetallkomplexe/ N,N′-Bis(diphenylphosphino)-S,S-dimethylsulfodiimine – a Ligand for Cyclic Transition Metal Complexes
Authors: Roesky Herbert W. , Zimmer Michael , Herbst Regine , Sheldrick George M. 
Published: March 2015

Abstract
Me2SN2P2Ph4M(CO)4 complexes (1) (M: 1 a Cr, 1 b Mo, 1 c W) have been synthesized from Me2S(NPPh2)2 and C7H8M(CO)4 . 1a-1c are stable at room temperature, 1 b crystallizes in the space group P21212 with cell constants a = 2486.3(2); b = 1488.8(1); c = 882.0(1) pm.
Reaktionen der höheren Halogenide des Niobs, Molybdäns und Wolframs mit dem Phosphor-Ylid (Et2N)3P=CH2 - Röntgenstruktur von [(Et2N)3PCH2]2
2+[WCl6]2-/ Reactions of the Higher Halides of Niobium, Molybdenum and Tungsten with the Phosphorus-Ylid (Et2N)3P=CH2– X-Ray Structure of [(Et2N)3PCH2]2
2+[WCl6]2-
Authors: Roesky Herbert W. , Mainz Bernhard , Noltemeyer Mathias , Sheldrick George M. 
Published: March 2015

Abstract
(Et2N)3 P=CH2 reacts with NbCl5 , WCl6 or WF6 under C-C bond formation to give the phosphonium cation [(Et2N)3 PCH2]2
2+ · [(Et2N)3PCH2]2
2+ [WCl6 ]2 - was isolated in a crystalline form and investigated by X-ray analysis. The reaction of (Et2N)3 P=CH2 with MOCl4 in a solvent proceeds with formation of the [(Et2N)3 PCH ]+ cation.
Untersuchungen zur Ringkontraktion am 1,4-Dithia-2,6-diaza-3,5-diborinan-System/ Studies on Ring Contraction of the l,4-Dithia-2,6-diaza-3,5-diborinane System
Authors: Habben Carl , Meiler Anton , Pusch Stefan 
Published: March 2015

Abstract
The 1,4-dithia-2,6-diaza-3,5-diborinanes 1a-d react with elemental sodium with formation of the 1,3-diaza-2,4-diboretidines 2a-d. By use of more sodium in case of 1 d or 3,5-bis(diethylamino)- 2-cyclohexyl-6-trimethylsilyldiborinane, the 1,3-thiaza-2,4-diboretidines 3 were formed. 3.5-Dimethyl-2,6-bis(trimethylsilyl)-1,4-dithia-2,6-diaza-3,5-diborinane gives the borazine 4, The reaction of di-t-butyl-sulfurdiimide with 2,6-di-t-butyl-3,5-dimethyl-1,4-dithia-2,6-diaza-3,5-diborinane leads by ring contraction to the four-membered ring system 5. 1H, 11B, 13C NMR and mass spectra are reported and discussed.
Komplexe mit aromatischen Carbonsäuren, IV. Ca2[C6H2(COO)4]·6H2O - Eine neue Schichtstruktur/ Complexes with Aromatic Carboxylic Acids, IV. Ca2[C6H2(COO)4]·6H2O - A Novel Layer Structure
Authors: Robl Christian 
Published: March 2015

Abstract
Single crystals of Ca2[C6H2(COO)4]·6H2O were grown in aqueous silica gel. Ca2+ has CN 6+2. The coordination polyhedron is formed by three water molecules and five oxygen atoms of carboxylate groups. Six oxygen atoms are closely bound (235,9-243,9 pm), the two remaining coordination partners are considerably more remote from Ca2+ (268,2 and 273,8 pm). COO- groups chelate Ca2+ in an asymmetric manner, but the C -O bond lengths do not differ markedly (125,2-126,3 pm). The connection of Ca2+ with [C6H2(COO)4]4- leads to rigid layers. Adjacent layers are interlinked by hydrogen bonds. Those oxygen atoms which are weakly bound to Ca2+ are favoured as proton acceptors in hydrogen bonds. The COO groups are tilted differently against the C6-ring plane. One is approximately coplanar, but the other is oriented almost perpendicularly.
NaGaSn5, eine neue Zintl-Phase mit Ga–Sn-Schrauben/ NaGaSn5, a New Zintl Phase Containing Ga–Sn Helices
Authors: Blase Wolfgang , Cordier Gerhard 
Published: March 2015

Abstract
NaGaSn, (trigonal; P3112 (No. 151); a = 632.8(4), c = 617.0(3) pm, Z - 1; dx = 5.33 g/cm3) was grown from the melt. The crystal structure contains Ga and Sn atoms in a helical arrangement (six atoms per turn) along the c-axis direction. Interatomic bonding between neighbouring helices completes a distorted [2+2]-tetrahedral environment for every Ga/Sn position. The compound is classified in terms of the Zintl concept.