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101	Author	G. Erhard Bringm, DanielaH. Erzberga, Geo Adam, Friedhelm Balkenhohlb, Joachim Paustb	Requires cookie*
	Title	A Short and Productive Synthesis of (R)-«-Lipoic Acid
	Abstract	Lipoic Acid, Yeast Reduction, Enantioselective Hydrogenation, Regioselective Reduction (R)-a-Lipoic acid is synthesized in seven steps from the base chemicals methyl acetoace-tate or M eldrum's acid and monom ethyl adipate. The key steps are the introduction of the stereogenic center by fermentative or hom ogeneously catalyzed hydrogenation of 3-oxo-octanedioic acid diester to (3S)-3-hydroxyoctanedioic acid diester and its regioselective re duction to (6S)-6 ,8-dihydroxyoctanoic acid ester. The overall yield of (R)-a-lipoic acid, start ing from 3-oxooctanedioic acid diester, is 40%. Results and Discussion The 3-oxo diesters 4 have not been employed
	Reference	Z. Naturforsch. 54b, 655—661 (1999); received Decem ber 4. 1999
	Published	1999
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	Identifier	ZNB-1999-54b-0655
	Volume	54

102	Author	Steffen Runge3, MathiasO. Senge3, Karin Ruhlandt-Sengeb	Requires cookie*
	Title	5,10,15,20-Tetrakis(diphenylmethyl)porphyrin -A Nonplanar Porphyrin with Intermediate Degree of Ruffling
	Abstract	The title compound was prepared by condensation of pyrrole and diphenylacetaldehyde in 16% yield. Based on spectroscopic data, the free base porphyrin exhibits a nonplanar macrocycle in solution with a degree of distortion between that of 5,10,15,20-tetracyclohexyl-porphyrin and 5,10,15,20-tetra(r-butyl)porphyrin. A crystal structure determination of the cobalt(II) complex reveals a ruffled macrocycle conformation with an average out-of-plane displacement of the m eso carbon atoms by 0.55 A.
	Reference	Z. Naturforsch. 54b, 662 (1999); received February 17 1999
	Published	1999
	Keywords	Porphyrins, Steric Strain, Cobalt Porphyrins, Crystal Structure, Conformation
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0662.pdf
	Identifier	ZNB-1999-54b-0662
	Volume	54

103	Author	Thomas Kurz, D. Etlef Geffken	Requires cookie*
	Title	Synthesis of 3-Amino(alkoxy)-2,4-dioxo-l,3-oxazolidine-5-carboxylates from Tartronic Esters
	Abstract	Tartronic Esters, l,l'-C arbonyl-di-(l,2,4-triazole), 3-A m ino-2,4-dioxo-l,3-oxazolidine-5-carboxylates, 3-A lkoxy-2,4-dioxo-l,3-oxazolidine-5-carboxylates The reaction of tartronic esters (la-d) with l,l'-carbonyl-di-(l,2,4-triazole), hydrazines or hydroxylamines produces 3-amino/3-alkoxy(aralkoxy)-2,4-dioxo-l,3-oxazolidine-5-carboxylic esters (5,6) which are structurally related to the fungicides Famoxadone (I) and Chlozolinate (II). Under suitable conditions the carboxylic ester of 6 can be converted to a carboxamide (7), carbohydrazide (8) or carbohydroxamic acid (9).
	Reference	Z. Naturforsch. 54b, 667—6 (1999); eingegangen am 30. Dezem ber 1998
	Published	1999
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0667.pdf
	Identifier	ZNB-1999-54b-0667
	Volume	54

104	Author	SanaaM. Eldin	Requires cookie*
	Title	Cyanothioacetamide and its Derivatives in Heterocyclic Synthesis: A New Route for the Synthesis of Several Pyridine and Thieno[2,3-b]pyridine Derivatives and their Biological Evaluation
	Abstract	Several new pyridine and thieno[2,3-b]pyridine derivatives were synthesized via the reac tions of some pyridinethiones, obtained by the action of acetylacetone on some thiocarbox-amidocinnamonitriles, with halogenated esters and ketones. Structures were established based on elemental and spectral data. All the synthesized compounds were tested for their biological activity.
	Reference	Z. Naturforsch. 54b, 674 (1999); received N ovem ber 9 1998
	Published	1999
	Keywords	Pyridines, Thieno[2, 3-b]pyridines, Cyanothioacetamide, Thiocarboxamido-cinnamonitriles, Michael Condensations
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0674.pdf
	Identifier	ZNB-1999-54b-0674
	Volume	54

105	Author	Axel Lifferth3, IsabelB. Ahnera, Ut Helm, Lackner, M. Artina Schäferb	Requires cookie*
	Title	Synthese und Struktur von Prolinring-modifizierten Actinomycinen des X-Typs Synthesis and Structure of Proline Ring Modified Actinomycins of the X-Type
	Abstract	The first total synthesis o f actinomycins containing L-4-hydroxyproline (1) and the separa tion and NM R spectroscopic assignment o f the regioisomers X (V* and iso-X0/i (lc, le) are described. The synthetic X 0/j proves, that the oxidized proline ring of the natural actinomycins
	Reference	Z. Naturforsch. 54b, 681—6 (1999); eingegangen am 15. Januar 1999
	Published	1999
	Keywords	Antibiotics, Actinomycins, Synthesis, Crystal Structure, NM R Data
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0681.pdf
	Identifier	ZNB-1999-54b-0681
	Volume	54

106	Author	Hong Zhanga, Yali Wanga, Rene Thiirmera, Khalid Parvez, Iqbal Choudhary, A. Tta-, Ur-R Ahm Anb, Wolfgang Voelter3	Requires cookie*
	Title	Neighbouring Group Participation of C-6 Substituents of Glucose Derivatives on the Stereoselectivity of the N-Glycosidic Linkage of Glycopeptides
	Abstract	The first example of a glycopeptide with a direct /V-a-glycosidic linkage between the trisac charide and the amino acid residue was found in the glomerular basement membrane of rats. In connection with the total synthesis of nephritogenoside, glycosyl azides with different protecting groups and carbohydrate chain lengths are synthesized, reduced to the corre sponding glycosyl amines and coupled with Z-Asp-O Bzl. Remarkable differences in the a:ß ratio of the condensation products are observed, caused by neighbouring group participation.
	Reference	Z. Naturforsch. 54b, 692—6 (1999); received February 2. 1999
	Published	1999
	Keywords	Oligosaccharide Synthesis, Glycopeptides, Neighbouring Group Participation
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0692.pdf
	Identifier	ZNB-1999-54b-0692
	Volume	54

107	Author	N. Orbert Kuhn, Heike Kotowski, Manfred Steimann	Requires cookie*
	Title	Synthese und K ristallstruktur von 3.6-Di-terf-butylpyridazin Synthesis and Crystal Structure of 3.6-Di-rm-butylpyridazine
	Abstract	Heterocycles, Pyridazines, X-Ray Data 3,6-Di-rm-butylpyridazine (4) is obtained from 2,2,7,7-tetramethyloctan-3,6-dione (2) and anhy drous hydrazine in good yield. Its X-ray structure is reported.
	Reference	Z. Naturforsch. 54b, 699—7 (1999); eingegangen am 5. Februar 1999
	Published	1999
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	Identifier	ZNB-1999-54b-0699_n
	Volume	54

108	Author	Bernd Aechter, Kurt Polborn, Volker Weinrich, Wolfgang Beck	Requires cookie*
	Title	/?-Tolyl(trimethylsiIylethynyl)sulfone as Synthon for the Synthesis of Cp(OC)2M -C =C SiM e3 (M = Fe, Ru). Molecular Structure of Cp(OC)2Fe-C =C SiM e3
	Abstract	Alkynyl Complexes, X-Ray Data, /?-Tolyl(trimethylsilylethynyl)sulfone The alkynyl complexes Cp(OC)2M -C = C S iM e 3 (M = Fe, Ru) are formed from p -to ly lS 0 2C = CSiMe3 and [Cp(OC)2M ]'N a +. The structure of Cp(OC)2F e-C = C S iM e 3 was determined by X-ray diffraction.
	Reference	Z. Naturforsch. 54b, 701 (1999); received February 4 1999
	Published	1999
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	Identifier	ZNB-1999-54b-0701_n
	Volume	54

109	Author	BemdW. Rackm, SergeiV. Ponomarevb	Requires cookie*
	Title	Decomposition of Ethoxyethynyl(trimethyl)tin -Studied by 119Sn and 13 C NMR Spectroscopy
	Abstract	A The thermally induced decomposition o f ethoxyethynyl(trimethyl)tin (1) was studied by ll9Sn NM R which revealed the formation o f bis(trimethylstannyl) ketene (2) as the major product, bis(trimethylstannyl) acetic acid ethyl ester (3) as a minor product, and a small amount o f tetramethyltin (4). Full NM R data sets, including coupling constants and isotope induced chemical shifts 1 _ \ 12 13C(1 l9Sn) are provided for 1 -3 . The first example o f ultra-high resolution " 9Sn NM R is shown.
	Reference	Z. Naturforsch. 54b, 705 (1999); received February 23 1999
	Published	1999
	Keywords	lkynes, Ketenes, Tin, NMR Data
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	Identifier	ZNB-1999-54b-0705
	Volume	54

110	Author	Rolf-Dieter Hoffmann3, Dirk Kußmanna, Ute Ch, Rainer Rodewald3, Pöttgen3, Carsten Rosenhahnb, BerndD. Moselb	Requires cookie*
	Title	New Stannides CaTSn2 (T = Rh, Pd, Ir) and Ca2Pt3 Sn5 -Synthesis, Structure and Chemical Bonding
	Abstract	New stannides CaTSm (T = Rh, Pd, Ir) and Ca2P hSn5 were prepared as single phase materials by a reaction o f the elements in glassy carbon crucibles under flowing purified argon. The four compounds were investigated by X-ray diffraction both on powders and single crystals and their structures were refined from single crystal data. The stannides CaTSn2 (T = Rh, Pd, Ir) adopt
	Reference	Z. Naturforsch. 54b, 709 (1999); received February 25 1999
	Published	1999
	Keywords	Intermetallic Calcium Compounds, Crystal Structure, Mössbauer Spectroscopy, Chemical Bonding
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	Identifier	ZNB-1999-54b-0709
	Volume	54

111	Author	Isabel Díaza, Vicente Fernández3, VitalyK. Belskyb, Jose Luis, M. Artínez0	Requires cookie*
	Title	Synthesis and Structural Study of the Thermochromic Compounds Bis(2-amino-4-oxo-6-methylpyrimidinium) Tetrachlorocuprate(II) and Bis(2-amino-4-chloro-6-methylpyrimidinium) Hexachlorodicuprate(II)
	Abstract	The compound bis(2-am ino-4-oxo-6-methylpyrimidinium) tetrachlorocuprate(II) 1 contains CuCU2-square-planar anions, and bis(2-am ino-4-chloro-6-m ethylpyrim idinium) hexachlorod-icuprate(II) 2 quasi-planar CU2CI62-anions. Both compounds show thermochromic behaviour. This phenomenon has been studied by X-ray crystallography at variable temperature, with the result that no major change is observed in the geometry o f the copper atom. Thus it is possible to assume som e influence o f the hydrogen bonds and o f the different geometries o f interme diate states on the color o f the compounds due to the modifications provoked in the L —>M charge transfer and in the energy o f the metal d-d transitions. Magnetic measurements o f the compounds give information on magneto-structural correlations. Compound 1 is ferromagnetic (Tc = 20 K) due to the perpendicular arrangement o f the square anions that allows exchange pathways only via Cu-Cl -Cu , H-bonding or cationic n electron interactions. Compound 2 shows a very complicated behavior at low temperature with local antiferromagnetic fluctua tions. Crystal data: 1 CioHioNftC^CUCu, triclinic, P i; 393(2) K: a = 11.053(2), b = 11.334(2), c = 14.038(3) (Ä), a = 95.76(3), ß = 101.35(3), 7 = 9 0 .1 5 (3) 0 ; 293(2) K: a = 11.022(2), b = 11.289(2), c = 14.001(3) (A), a = 95.86(2), ß = 101.34(2), 7 = 9 0 .0 9 (3) 0 ; 155(2) K: a = 11.008(2), b = 11.231 (2), c = 13.967(3) (A), a = 95.86(2), ß = 101.37(2), 7 = 8 9 .9 9 (2) 0 ; Z = 4. 2 (C5H7N 3C l3Cu)2, monoclinic, P 2,/c; 293(2) K: a = 5.998(1), b =18.669(4), c = 9.466(2) (A), ß = 1 0 0 .9 3 (3)0 ; 150(2) K: a = 5.971(1), b = 18.655(4), c = 9.3 8 3 (2) (Ä), ß = 1 0 1 .6 4 (1) 0 ; Z = 4.
	Reference	Z. Naturforsch. 54b, 718 (1999); received March 1 1999
	Published	1999
	Keywords	Thermochromic Compounds, Copper, Chloride
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	Identifier	ZNB-1999-54b-0718
	Volume	54

112	Author	M. Fernanda, N. N. Carvalho3, ArmandoJ L Pombeiro3, Gabriele Wagner3, Bj0m Pedersenb, Rudolf Herrmann	Requires cookie*
	Title	Cascade Reaction of Camphor-Derived Diynes with Transition Metal Compounds
	Abstract	Platinum(II) catalyzes the isomerization o f camphor sulfonamide diynes in a cascade reaction involving annulation o f a five-membered ring to the camphor skeleton, ring-enlargement by C-C bond cleavage, reduction o f sulfur(VI) to sulfur(IV), and oxidation o f a hydroxy group to a ketone. The reactions o f the diynes with other transition metal compounds were also studied. Copper, gold and rhenium give final products similar to those obtained with simple Br0nsted acids or halogens, mainly by annulation o f a five-membered ring to the camphor moiety, accompanied by reduction o f a sulfonamide to a sulfinamide group, but lacking the ring-enlargement step. Palladium(II) occupies an intermediate position as both types o f products are obtained. The reaction mechanism and intermediates are discussed.
	Reference	Z. Naturforsch. 54b, 725—733 (1999); received March 18 1999
	Published	1999
	Keywords	Camphor Diyne, Ring Enlargement, Transition Metals, Catalysis, Alkyne
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	Identifier	ZNB-1999-54b-0725
	Volume	54

113	Author	Winfried Hoffmüller, Kurt Polborn, Wolfgang Beck	Requires cookie*
	Title	Ein tetraedrischer Zink-Komplex (L-terf-Leucin)2ZnCl2 mit Carboxylat-koordiniertem L-terf-Leucin in der Zwitterform Metal Complexes of Biologically Important Ligands, CXIX [1]. A Tetrahedral Zinc Complex (L-terf-Leucine)2ZnCl2 of Carboxylate Coordinated L-terr-Leucine in the Zwitterionic Form
	Abstract	Zinc, L-terr-Leucine From an aqueous solution o f ZnCl2 and L-terMeucine the complex (L-r^rr-leucine)2ZnCl2 • 2 CH3OH with a distorted tetrahedral structure is formed in which, according to an X-ray structure analysis, the zwitterionic form o f the amino acid is coordinated through the carboxylate group. Metallkomplexe mit biologisch wichtigen Liganden, CXIX [1].
	Reference	Z. Naturforsch. 54b, 734—7 (1999); eingegangen am 1. April 1999
	Published	1999
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	Identifier	ZNB-1999-54b-0734
	Volume	54

114	Author	Snte, PbteO. Bosholm, H. Oppermann	Requires cookie*
	Title	Untersuchungen zum chemischen Transport intermetallischer Phasen, I: GeTe, SnTe, PbTe Investigations on the Chemical Transport of Intermetallic Phases, I: GeTe
	Abstract	GeTe, SnTe, and PbTe have been prepared by chemical transport reactions with iodine as transport agent in the temperature range between T2 (800 -700 °C) and T , (700 -500 °C). The effective transport equilibria were determineted. Total pressure measurements in the system Ge-Te-I give the coexistence equlibria for condensed phases, and also for the gasphase equilibra. GeTe4 exists only as a metastable phase at lower temperatures and decom poses near 260 °C in GeTe and Te. Thermodynamic calculations show satisfactory agreement between calculation and experi ment.
	Reference	Z. Naturforsch. 54b, 737 (1999); eingegangen am 26. Februar 1999
	Published	1999
	Keywords	Chemical Transport Reactions, Total Pressure Measurement, Calculation o f CTR, Thermodynamic Data
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	Identifier	ZNB-1999-54b-0737
	Volume	54

115	Author	Joachim Pickardt, Pirka Wischlinski	Requires cookie*
	Title	Kristallstruktur des "supramolekularen" Komplexes [K(Benzo-18-krone-6)][Zn(CN)3]H20 mit einem polymeren kettenförmigen Tricyanozincat-Anion Crystal Structure of the "Supramolecular" Complex [K(benzo-18-crown-6)][Zn(CN)3] H20 with a Polymeric Tricyano Zincate Anion with Chain Structure
	Abstract	Crystals o f the com plex [K (benzo-18-crown-6][Zn(CN)3] H20 were obtained from a solution o f Z n(C N)2, KCN, and b en zo-18-crown-6 in water/methanol. The compound crystallizes in the triclinic space group PI (no. 2),: Z = 2, a = 818,6(5), b = 1236,7(8), c = 1359,6(6) pm, a = 67,02(4), ß = 87,38(4), 7 = 75,46(5). Each Zn atom is bonded to one bridging cyanide ion to give chains -Z n (C N)Z n -, and to two terminal CN groups. The N atom o f one o f the terminal CN groups interacts with a potassium ion o f the [K (benzo-18-crow n-6)]+ unit. The coordination spheres o f the K ions are completed by water molecules, which in turn form hydrogen bonds to N atoms o f terminal CN groups o f neighbouring chains, whereby puckered sheets are formed.
	Reference	Z. Naturforsch. 54b, 747 (1999); eingegangen am 10. Februar 1999
	Published	1999
	Keywords	Zinc Cyanide C om plex, Crown Ether Complex, Crystal Structure
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	Identifier	ZNB-1999-54b-0747
	Volume	54

116	Author	Karin Brüning, Bettina Lühmann, Heinrich Lang	Requires cookie*
	Title	.2-Verzweigte Carbosiloxan-Dendrimere mit Hauptgruppenelement- und Übergangsmetall-modifizierten Oberflächen 1.2-Branched Carbosiloxane-Dendrimers with Main-Group Element and Transition-Metal Modified Surfaces
	Abstract	The preparation o f the first and second generation carbosiloxane dendrimers Si[O C H ,-C h L C H ,S iM e(O C fL C = C H),]4 (3) and Si{O C H X H ,C H ,SiM e[O C H ,C FL C fL SiM e(O C F L -C = C H)2]2}4 (5) by the reaction o f Si(O C H ,C H ,C H ,SiM eC L)4 (1) or S i[O C H X H ,C H ,S iM e-(OCH2CH2CH2SiM eC l2)2]4 (4) with HOCH2C = C H (2) in the presence o f NEt3 is descri bed. Dendrimers 3 and 5 contain propargyloxy units as terminal groups, which can be trans ferred to Co2(C O)8 (6) to give the hexacarbonyldicobalt functionalized dendritic m olecu les S i{O C H ,C H X H ,S iM e [(/72-O C H ,C = C H)C o,(C O)6] , } 4 (7) and S i{ O O L O L C H ,S iM e -(OCH2CH2CH2S'iMe[(?72-OCH2C = C H)C o 2(CO)6]2)2} 4 (8). All compounds were characterized by elemental analyses, spectroscopic studies (IR, 'H-, 13C { 1H }-, -9S i{ 1H } N M R) as w ell as GPC investigations.
	Reference	Z. Naturforsch. 54b, 751 (1999); eingegangen am 21. Januar 1999
	Published	1999
	Keywords	Carbosiloxane, Dendrimer, Propargyloxy Unit, Hexacarbonyldicobalt, Coordination Ability
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	Identifier	ZNB-1999-54b-0751
	Volume	54

117	Author	Christiane Leben, Martin Jansen	Requires cookie*
	Title	Darstellung und Kristallstruktur von Triammonium-trisulfimid (NH4)3(N S02)3 Preparation and Crystal Structure of Triammonium-trisulfimid (NH4)3(N S 0 2)3
	Abstract	The preparation and crystal structure o f (N H 4N S 0 2)3 (a = 11.720(2), b = 6.156(6), c = 14.030(2) A ,ß = 96.69(8)°) is reported. The structure reveals a chair-conformation o f the anions, which are arranged to form a hexagonal rod stacking. Compared to cyclometatriphosphates the cations are coordinated differently due to the different basicities o f the bridging nitrogen and oxygen atoms, respectively.
	Reference	Z. Naturforsch. 54b, 757 (1999); eingegangen am 24. Februar 1999
	Published	1999
	Keywords	Sulfimide, Ammonium, Preparation, Single-Crystal Structure Determination
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	Identifier	ZNB-1999-54b-0757
	Volume	54

118	Author	Tjark Siedentop, Ion Neda, Holger Thönnessen, PeterG. Jones, Reinhard Schmutzler	Requires cookie*
	Title	Synthese und Röntgenstrukturanalyse der ersten terf-Butylcalix[4]arensalze mit einem Phosphonium-Kation Synthesis and X-Ray Structure Analysis of the First rm-Butylcalix[4]arene Salts with a Phosphonium Cation
	Abstract	terr-Butylcalix[4]arene A nions, rm -Butylcalix[4]arenes (Phosphorus-Substituted), Phospho nium Salts (Tetramethylguanidine-Substituted), X-Ray Data The reactions o f ter/-butylcalix[4]arene (1) and the phosphorus-substituted rm -butylcalix-[4]arene (2), respectively, with terf-butylbis[N-(N',N',N",N"-tetramethyl)guanidinyl]phosphine (3) led to the first calix[4]arene-anions with the protonated phosphonium cations 4 and 5. N o protonation o f the imino nitrogen atom was observed. In the case o f compound 4, a single crystal X-ray structure analysis has been conducted. In compound 5, phosphorus atoms in the oxidation states +III and +V are present in one molecule.
	Reference	Z. Naturforsch. 54b, 761—7 (1999); eingegangen am 11. Februar 1999
	Published	1999
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	Identifier	ZNB-1999-54b-0761
	Volume	54

119	Author	L. Homolya, S. Strueß, W. Preetz	Requires cookie*
	Title	Kristallstrukturen und Normalkoordinatenanalyse von fraws-(w -Bu4N)2 [ReCl4IX], X = NCS, NCSe Crystal Structures and Normal Coordinate Analyses of trans-(n-Bu4 N)0 [ReCl4 IX], X = NCS, NCSe
	Abstract	rra«s-Tetrachloromonoiodothiocyanato(N)-rhenate(IV), rrans-Tetrachloro-monoiodoselenocyanato(N)-rhenate(IV), Crystal Structure, Normal Coordinate Analysis The crystal structures o f rrafls-(n-Bu4N)2 [ReCl4I(NCS)] (triclinic, space group PI, a = 11.268(3), b = 11.696(2), c = 18.109(3) A , a = 98.68(2) ß = 106.40(2), 7 = 97.58(2)°, Z = 2)andrrans-(«-B u4N)2 [ReCl4 I(NCSe)] (orthorhombic, space group P 2)2 ,2,, a = 11.839(2), b = 12.2679(10), c = 31.136(5) A, Z = 4) have been determined by single crystal X-ray diffraction analysis. Based on the molecular parameters o f the X-ray determinations the low temperature (10 K) IR and Raman spectra o f the (n-Bu4N) salts have been assigned by normal coordinate analysis. The valence force constants are fd(R eN) = 1.69(N CS) and 1.65(N CSe) mdyn/A.
	Reference	Z. Naturforsch. 54b, 767—771 (1999); eingegangen am 11. Februar 1999
	Published	1999
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	Identifier	ZNB-1999-54b-0767
	Volume	54

120	Author	C. Drewes, W. Preetz	Requires cookie*
	Title	Darstellung, n B-NMR-und Schwingungsspektren
	Abstract	von c/s-Monoethyl-m0n0nitr0tetrahydr0-c/050-hexab0rat(2-) sowie Kristallstruktur von cM P h 4As)2[B6H4(C2H5)(N 0 2)] Synthesis, 11B NMR and Vibrational Spectra of ds-Monoethylmononitrotetrahydro-c/<m>-hexaborate(2 -) and Crystal Structure of c/5'-(Ph4 As)2 [B6 H4 (C2H5)(NO-,)] c/5-Monoethylmononitrotetrahydro-c/o5o-hexaborate(2 -), Crystal Structure, n B NMR Data, Vibrational Spectra By electrochemical oxidation of (n-Bu4N)[B6H5H^!'(C2Hs)] in the presence of nitrite ions and of the base DBU in dichloromethane solution c/\HB6H4(C2H5)(N02)]2_ is formed. X-ray diffraction analysis has been performed on a single crystal of c/s-(Ph4As)2[B6H4(C2H5)(N0 2)] (triclinic, space group PI; a = 10.673(4). b = 10.907(4), c = 21.237(4) A, a = 80.789(4), ß = 83.117(4), 7 = 66.548(2)°, Z = 2). The MB NMR spectrum is consistent with a disubstituted octahedral B6 cage with local Cs symmetry. The IR and Raman spectra exhibit characteristic CH3, CH2, N 02, BN, BH and B6 vibrations.
	Reference	Z. Naturforsch. 54b, 772—776 (1999); eingegangen am 26. Februar 1999
	Published	1999
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	Identifier	ZNB-1999-54b-0772
	Volume	54

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