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41Author    Teresa Borowiak3, Irena Wolska3, Herbert Mayrb, Janusz BarancRequires cookie*
 Title    X-Ray Structure4]non-2-ene  
 Abstract    of 6(is)-[2(Z)-(Hydroxyimino)-2-phenylethyIidene]-7,7,8,8,9,9-hexamethyl-3-phenyl-l,2-oxazaspiro[4. The X-ray crystallographic structure of the title compound, a product of a 1,3-dipolar cy­ cloaddition reaction of benzonitrile oxide to 3,3,4,4,5,5-hexamethyl-l,2-bis(methylene)cyclo-pentane, has been determined. Colourless plates crystallize in the orthorhombic space group Pbca with cell dimensions a = 13.698(2), b = 11.836(2), c = 29.157(4) A, V= 4727.2(1.2)A3, Z = 8, 3736 reflections, final R(F) = 0.063 and wR(F2) = 0.166. The crystals are racemic, the molecules of opposite chirality form centrosymmetric dimers via intermolecular hydro­ gen bonds O-H -N between their oxime groups. The molecules are highly strained and the geometrical consequences of the steric strain are discussed. 
  Reference    Z. Naturforsch. 56b, 354—358 (2001); received November 27 2000 
  Published    2001 
  Keywords    1, 3-Dipolar Cycloaddition Product, Oxime, Isoxazoline 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0354.pdf 
 Identifier    ZNB-2001-56b-0354 
 Volume    56 
42Author    S.Requires cookie*
 Title    Strahlenchemische Cycloadditionen mit Äthylen und Acetylen (Produktbildung und Lösungsmittelwahl)  
 Abstract    R a d ia tio n Chemical C ycloaddition Reactions w ith Ethylene and Acetylene M a n f r e d J . M i r e a c h 1, M a r l i s F. M i r b a c h 1 u n d A l f o n s S a u The (2 + 2) cycloadditions of maleic acid anhydride (MSA) and 1,3-cyclohexadiene (CHD) to ethylene and acetylene were initiated with gamma-rays in different solvents. The four-membered ring products were formed with high selectivity and surprisingly high energy yields in solvents with triplett energies smaller than ethylene and acetylene but higher than MSA and CH D resp. In benzonitrile as a solvent MSA reacts with ethylene to give cyclobutane-l,2-dicarboxylic acid anhydride (1) (G = 0.04) and with acetylene to give cyclobut-3-ene-l,2-dicarboxylic acid anhydride (2) (G = 3.7). The cyclobutene derivative (2) is formed in >80% yield and the bicyclopropyl derivative (3), which is the main product in the photochemical reaction, with a yield of <20%. 1,3-Cyclohexadiene was also added to ethylene to give bicyclo(4,2,0)oct-2-ene (G = 0.4) and bicyclo(2,2,2)oct-2-ene (G = 0.1) under gamma irradiation in methylnaphthalene as a solvent. Under similar conditions addition to acetylene gave bicyclo(4,2,0)octa-2,7-diene (G = 0.04) and bicyclo(2,2,2)octa-2,5-diene (G = 0.3), respectively. 
  Reference    (Z. Naturforsch. 32b, 281—284 [1977]; eingegangen am 6. Oktober 1976) 
  Published    1977 
  Keywords    Cycloaddition, Ethylene, Acetylene, Maleic Acid Anhydride, 1, 3-Cyclohexadiene 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0281.pdf 
 Identifier    ZNB-1977-32b-0281 
 Volume    32 
43Author    Gerd-Volker RöschenthalerRequires cookie*
 Title    Über die Reaktionen von Phosphanen MenP [OCH(CF3 )2] 3_" mit Hexafluoraceton Reactions of Phosphanes MenP[OCH(CF3)2]3-n with Hexafluoroacetone  
 Abstract    The stable phosphanes Me2POCH(CF3)2 and MeP[OCH(CF3)2]2 have been prepared and reacted with hexafluoroacetone yielding 1,2-oxaphosphetanes. The analogous reaction with Me2PF was carried out giving a 1 : 1 : 1 mixture of a 1,3,2-, a 1,3,4-dioxaphospholane, and a 1,2-oxaphosphetane. P[OCH(CF3)2]3 did not react with hexafluoroacetone. The new compounds were characterized by NMR, mass spectrometry and elemental analysis. 
  Reference    Z. Naturforsch. 33b, 131—135 (1978); eingegangen am 12. September 1977 
  Published    1978 
  Keywords    Dimethylhexafluoroisopropoxyphosphane, Methyl-bis(hexafluoroisopropoxy)phosphane, 1, 2-Oxaphosphetanes, Oxyphosphoranes, Hexafluoroacetone 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0131.pdf 
 Identifier    ZNB-1978-33b-0131 
 Volume    33 
44Author    Krystyna Lesiak, WojciechJ. StecRequires cookie*
 Title    The Stereochemistry of P-N Bond Cleavage in the Staudinger -Wittig-type Reaction of 2-Anilido-3,4-dimethyl-5-phenyl-l,3,2-oxazaphospholidine-2-thiones  
 Abstract    Both isomers of 2-anilido-3,4-dimethyl-5-phenyl-l,3,2-oxazaphospholidine-2-thiones (2 a and 2 b) derived from (—)ephedrine were obtained and converted to corresponding 2-thiomethyl derivatives (3 a and 3 b). The Staudinger-Wittig-type reaction of P-N bond cleavage was found to proceed with full retention of configuration at P-atom involved into five-membered ring system. 
  Reference    Z. Naturforsch. 33b, 782—785 (1978); received March 28 1978 
  Published    1978 
  Keywords    1, 3, 2-Oxazaphospholidines, (—)Ephedrine, Thioanilides, Thioesters, Stereochemistry 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0782.pdf 
 Identifier    ZNB-1978-33b-0782 
 Volume    33 
45Author    W. L. Driessen, P.L A EverstijnRequires cookie*
 Title    Metal(II) Complexes of 1,2,5-Oxadiazole  
 Abstract    A series of new coordination compounds is reported with 1,2,5-oxadiazole (ODZ) as the ligand, viz. [M(ODZ)3](SbCl 6)2 with M = Mg(II), Mn(U), Fe(II), Co(II), Ni(II), and Zn(II). The metal ions are in a regular octahedral environment of six nitrogen atoms. The ligands function as bidentate bridges between the metal ions. 
  Reference    Z. Naturforsch. 33b, 1120—1123 (1978); received June 12 1978 
  Published    1978 
  Keywords    Transition Metal Ions, 1, 2, 5-Oxadiazole, Ligand Field Spectra, IR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1120.pdf 
 Identifier    ZNB-1978-33b-1120 
 Volume    33 
46Author    Heinz-Peter Schuchmann, Heinz Bandmann, Clemens Von SonntagRequires cookie*
 Title    The 185 nm Photolysis of 1,4-Dioxane in the Liquid Phase  
 Abstract    The main products in the 185 nm photolysis of neat 1,4-dioxane are formaldehyde (0 = 0.25), glycol monovinyl ether (0.17), and ethylene (0.15). Some hydrogen (0.04), carbon monoxide (0.01), acetaldehyde (0.03), oxetane (0.04), and bidioxanyl (0.01) are also formed. On N20-saturation, the quantum yields of these products are diminished by about 30%, and N2 (0.59) and hydroxydioxane (0.4) become the main products. They are thought to be formed in the reaction sequence hv dioxane > • dioxane* dioxane* + N20 > • dioxane + N2 + O O + dioxane > • hydroxydioxane In aqueous dioxane, photoionisation is possible due to a greater lowering of the ionisa-tion threshold. In dioxane/water 20:80 the main products are H2 (0.50) and bidioxanyl (0.45), most likely formed in consequence of (dioxane)aq (dioxane)aq + eäq (dioxane)Jq • (dioxane-H)-+ H+ eäq + H+ > H-H-+ dioxane >-H2 + (dioxane-H)-2 (dioxane-H)- • bidioxanyl 
  Reference    Z. Naturforsch. 34b, 327—332 (1979); received October 6 1978 
  Published    1979 
  Keywords    Photolysis, 1, 4-Dioxane, Photoionisation, Energy Transfer, Quantum Yields 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0327.pdf 
 Identifier    ZNB-1979-34b-0327 
 Volume    34 
47Author    Richard Goetze, Heinrich NöthRequires cookie*
 Title    Zur Kenntnis von 1.3.2-Dithiaborolen [2] Contributions to the Chemistry of Boron, 112 [1] 1,3,2-Dithiaboroles [2]  
 Abstract    Several methods were used to prepare a series of boron substituted 1,3,2-dithiaborols. The NMR data of this new class of compounds indicate in comparison to 1,3,2-dithia-borolanes, that the heterocycle can be looked at as a 6 jt-electron system. A high degree of analogy in the mass spectrometric fragmentation of dithiaborolanes and dithiaborols exists, however, the parent ion of 2-methyl dithiaborol is more stable than that of the saturated analogon. 
  Reference    Z. Naturforsch. 35b, 1212—1221 (1980); eingegangen am 30. Januar 1980 
  Published    1980 
  Keywords    1, 3, 2 -Dithiaboroles, n B NMR Spectra, 13 C NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1212.pdf 
 Identifier    ZNB-1980-35b-1212 
 Volume    35 
48Author    Herbert Meier, Johannes Zountsas, Oswald ZimmerRequires cookie*
 Abstract    A X H and 13 C NMR spectroscopical study is performed on the basis of 37 1,2,3-selena-diazoles. Besides the discussion of chemical shifts and coupling constants of X H and 13 C, selenium satellites were measured providing 1 H 77 Se and 13 C 77 Se coupling constants. 
  Reference    Z. Naturforsch. 36b, 1017—1022 (1981); eingegangen am 16. April 1981 
  Published    1981 
  Keywords    NMR Spectra, 1, 2, 3-Selenadiazoles, 77 Se Coupling 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1017.pdf 
 Identifier    ZNB-1981-36b-1017 
 Volume    36 
49Author    Udo Plücken, Herbert MeierRequires cookie*
 Title    Lanthanide Induced Shifts in the »H and 13 C Nuclear Magnetic Resonance Spectroscopy for Structure Elucidations of Thiadiazole Oxides  
 Abstract    A systematic investigation of the LIS-method for structure elucidations is performed on the basis of thermally generated monoxides of 1,2,3-thiadiazoles. A calculation process for the evaluation of lanthanide induced shifts according to the McConnell-Robertson equa-tion was developed. The program can be applied to underdetermined systems with fewer variables than chemically not equivalent X H plus 13 C nuclei. A quality criterium for the method is given by 4-phenyl-l,2,3-thiadiazole-3-oxid -wellknown by an X-ray analysis. 
  Reference    Z. Naturforsch. 36b, 1305—1314 (1981); eingegangen am 21. Aprü 1981 
  Published    1981 
  Keywords    1, 2, 3-Thiadiazole-oxides, LIS Measurements, LIS Computer Program 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1305.pdf 
 Identifier    ZNB-1981-36b-1305 
 Volume    36 
50Author    Waldemar Adam, Omar CuetoRequires cookie*
 Title    3,3-Dimethyl-4 [2-methyl-l-propenyl] -1,2-dioxetane: Its Thermal Stability and Chemiluminescent Properties  
 Abstract    The alkenyl-substituted 1,2-dioxetane (1) was prepared by photosensitized singlet oxygenation of 2,5-dimethyl-2,4-hexadiene and its activation and excitation parameters determined. It is shown that dioxetane (1) is comparable in its thermal stability to alkyl-substituted dioxetanes and an inefficient chemical source of electronic excitation. 
  Reference    Z. Naturforsch. 36b, 1653—1654 (1981); received June 29 1981 
  Published    1981 
  Keywords    1, 2-Dioxetanes, Chemüuminescence, Activation Parameters, Excitation Yields, Solvent Effects 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1653.pdf 
 Identifier    ZNB-1981-36b-1653 
 Volume    36 
51Author    Elli Theodoridou, Pantelis Karabinas, Dimitrios JannakoudakisRequires cookie*
 Title    Elektrochemisches Verhalten der Nitrophenole und ihrer Reduktionsprodukte an Graphitelektroden, II Mechanismus und Kinetik Electrochemical Behavior of the Nitrophenols and their Reduction Products at Graphite Electrodes, II Mechanism and Kinetic  
 Abstract    The mechanism of the electrochemical reactions of l-nitro-2-naphthol, o-nitrophenol and p-nitrophenol at carbon fibre electrodes is investigated in aqueous solutions with pH= 1-10. The above nitrophenols are reduced to the corresponding amines, which are reoxidized to quinone imines. As the quinone imines are partially hydrolysed to quinones, the kinetic of this hydrolysis reaction is also examined. In the case of l-nitro-2-naphthol the hydrolysis rate constant of 1,2-naphthoquinone imine is estimated as a function of pH by cyclic voltammetry. 
  Reference    (Z. Naturforsch. 37b, 97—101 [1982]; eingegangen am 14. September 1981) 
  Published    1982 
  Keywords    Cyclic Voltammetry, Graphite Electrodes, o-Nitrophenol, 1, 2-Naphthoquinoneimine 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0097.pdf 
 Identifier    ZNB-1982-37b-0097 
 Volume    37 
52Author    Cornelia Lensch, Oskar GlemserRequires cookie*
 Title    Darstellung und Reaktionen von S.N-Bi8(heptafluorisopropyl)schwefelfluoridimid Preparation and Reactions of S,N-Bis(heptafluoroisopropyl)sulphurfluoride Imide  
  Reference    Z. Naturforsch. 37b, 401—403 (1982); eingegangen am 8. Dezember 1981 
  Published    1982 
  Keywords    Sulphur-amide, N-hexafluoroisopropyl, S -[2 -chlorine-1, 1, 1, 3, 3, 3 -hexafluoro]isopropyl, Sulphurfluoride-imide, N-heptafluoroisopropyl, S-[2-chlorine-l, l, l, 3, 3, 3-hexafluoro]isopropyl, Sulphur-imide, N-heptafluoroisopropyl, S-dimethoxy 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0401.pdf 
 Identifier    ZNB-1982-37b-0401 
 Volume    37 
53Author    Martin Hoch, Dieter RehderRequires cookie*
 Title    Carbonylniobium Chemistry, IV [1] Derivatives of ^ 5 -C5H5Nb(CO)4 with Tridentate Phosphines  
 Abstract    The photo-induced reaction between CpNb(CO)4 and Ph2P(CH2)2PR(CH2)2PPh2 (L; R = Ph, Cy) yields the chelated five-membered ring complexes cis-[CpNb(CO)2L] (two isomers in the case of R = Cy). The uncordinated PPI12 group reacts with CpNb(CO)3THF to form CpNb(CO)2(ia-L)CpNb(CO)3. IR, 31 P and 93 Nb NMR spectra are discussed and compared with corresponding data of the analogous vanadium complexes. 
  Reference    Z. Naturforsch. 38b, 446—448 (1983); received December 17 1982 
  Published    1983 
  Keywords    Carbonylniobium, 1, 4, 7-Triphosphaheptanes, 31 P NMR, 93 Nb NMR 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0446.pdf 
 Identifier    ZNB-1983-38b-0446 
 Volume    38 
54Author    Hans-Ulrich Höfs, Rüdiger Mews, Mathias Noltemeyer, GeorgeM. Sheldrick, Martin Schmidt, Gerald Henkel, Bernt KrebsRequires cookie*
 Title    Reactions of Fluorinated Nitriles with Sulphur(II) Chlorides; Crystal Structure of 2,4,6-Tris(difluorosulphoximido)-l,3,5-triazene at 170 K  
 Abstract    The addition of CF3SC1 (2) to the fluorinated nitriles RfCN[Rf = CF3 (3), NSF2 (4), NSOF2 (5)] leads to N-perfluoromethanesulphenyl-formylimidoylchlorides CF3S-N = C(C1)/?/ (6, 11, 12). From the reactions of SC12 (1) with (3) and (5), which yielded the N-sulphenyl-chlorides C1S-N = C(C1)-R/ (7, 13), it proved possible also to isolate the oxidation product [CF3CC12NSC12 (8)] and an oligomer of the nitrile [(NCNSOF2)3 (14)]. Dechlorination of 7 with Hg gives the corresponding di-and tri-sulphides (CF3C(Cl) = N-)2Sa; (9, 10, x — 2, 3). Crystals of (14) are triclinic with a = 1133.6(5), b = 1332.6(5), c = 1715.1(8) pm, a = 109.31(3), ß = 105.30(3), y = 97.84(3)° at 170 K, Z = 8, space group P I. The structure was refined to R = 0.028 for 8290 diffractometer data with F > 4cr(F). The four crystallo-graphically independent molecules adopt similar unsymmetrical conformations. N-Sulphenylacetimidoyl halides of the type RC(X)=N-S-Y are important in preparative chem-istry for several reasons: (a) When Y is a halogen, it may be readily exchanged, leading to a chemistry analogous to that of the perhaloalkylsulfenylhalides RhaiSCl [1, 2]. Examples of such substitution reac-tions have already been reported [2, 3], (b) When the substituent X on the triply-coordinated carbon is a halogen, the -M effect of the imino-nitrogen facilitates nucleophilic attack. Hard nucleophiles (fluoride, alcohols, amines) tend to replace X [4], soft nucleophiles the sulphur-substituent Y. (c) The >C=N-S-system may be regarded as a shortened diene, in which the second double bond is replaced by the oxidisable sulphur atom; instead of the usual 1,4-addition this results in 1,3-addition with simul-taneous oxidation of the sulphur [5]. One of the simplest examples of this class of com-pounds , chlorosulphenylchloroformylimidoylchloride may be prepared in several ways; the synthesis [6] from C1CN and SC12 opens a general route to the N-sulphenylimidoyl derivatives [4, 7-9]: C1CN + SC12 C1S-N=CC12 1 RCN + R'SCl -> R'S-N=CC1R 2 * Reprint requests to Prof. R. Mews. 0340-5087/83/0400-0454/$ 01.00/0 We report here an investigation of the corresponding addition of CF3SCI and SC12 to the fluorinated nitriles N = C-CF3, N = C-NSF2 and N = C-NSOF2. Experimental 
  Reference    Z. Naturforsch. 38b, 454—459 (1983); eingegangen am 8. November 1982 
  Published    1983 
  Keywords    Crystal Structure, Perfluoromethanesulphenylformylimidoylchlorides, N-Sulphenylchlorides, 1, 3, 5 -Triazenes 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0454.pdf 
 Identifier    ZNB-1983-38b-0454 
 Volume    38 
55Author    M. Torres, A. Clement, 0. P. StrauszRequires cookie*
 Title    Argon-Matrix Isolation of Bis(carbomethoxy)thiirene: Formation of Acyl and Carbalkoxythioketenes  
 Abstract    Photolysis of argon-matrix isolated 4,5-bis(carbomethoxy)-l,2,3-thiadiazole with A = 254 or 265 nm resulted in the almost quantitative formation of bis(carbomethoxy)-thiirene (3g). Photolysis of 3g could only be carried out by long irradiation times at short wavelength A = 210nm and resulted mainly in extensive fragmentation instead of the formation of bis(carbomethoxy)thioketene, confirming earlier predictions that substituents, especially electron-withdrawing ones, should stabilize the thiirene ring. Methylcarboethoxy and methylacetylthioketene were obtained, however, in the argon-matrix photolysis or flow thermolysis of 4-methyl-5-carboethoxy-or 4-carboethoxy-5-methyl-l,2,3-thiadiazole and 4-acetyl-5-methyl-l,2,3-thiadiazole, respectively. 
  Reference    Z. Naturforsch. 38b, 1208—1212 (1983); received June 6 1983 
  Published    1983 
  Keywords    Thiirene, Thioketene, 1, 2, 3-Thiadiazole, Thio-Wolff Rearrangement 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1208.pdf 
 Identifier    ZNB-1983-38b-1208 
 Volume    38 
56Author    Susanna Kerschl, Bernd WrackmeyerRequires cookie*
 Title    Organoborierung von Alkinylstannanen, XIV [1]  
 Abstract    Organoborierung von Bis(alkinyl)stannanen: Mechanismus und Anwendung der 119Sn—NMR-Spektroskopie O rganoboration of Alkynylstannanes, XIV [1] O rganoboration of Bis(alkynyl)stannanes: M echanism and Application of 119Sn NM R Spectroscopy Dimethylbis(phenylethynyl)stannane (1) reacts with trialkylboranes, BR3 (2), to give bis(al-kenyl stannanes (5) (R = C2H5), l-bora-4-stanna-2,5-cyclohexadienes (6) (R = C2H5, C3H7'), 1-stanna-2,4-cyclopentadienes (7) (R = C2H5) and l-stanna-3-cyclopentenes (8) (R = CH3, C2H5). I3C and uySn NMR data prove the structure of the reaction products (5 to 8). 119Sn NMR is useful (i) for following the course of the reaction (mechanism!) and (ii) for quantitative analysis of the product distribution. Deorganoboration reactions play an important role in the formation of the various heterocyclic systems. 
  Reference    Z. Naturforsch. 39b, 1037—1041 (1984); eingegangen am 24. Februar 1984 
  Published    1984 
  Keywords    et Alkynylstannanes, Organoboration, Mechanism, 1, ySn NMR Spectra, 13C NMR Spectra 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-1037.pdf 
 Identifier    ZNB-1984-39b-1037 
 Volume    39 
57Author    Christa Pomp, Stefan Drüeke, Heinz-Josef Küppers, Karl Wieghardt, Carl Krüger, Bernhard Nuber, Johannes WeissRequires cookie*
 Title    Synthese  
 Abstract    von [LRe(CO) 3 ] + -Komplexen mit makrocyclischen Liganden Die Kristallstrukturen von 1,4,7-TriazacycIononan-tricarbonyl-rhenium(I)-thiocyanat und 1,4,7-Trithiacyclononan-tricarbonyl-rhenium(I) -bromid-hemihy drat Synthesis of [LRe(CO) 3 ]" Complexes with Macrocyclic Ligands The Crystal Structures of l,4,7-Triazacyclononane-tricarbonyl-rhenium(I) Thiocyanate and of l,4,7-Trithiacyclononane-tricarbonyl-rhenium(I) Bromide Hemihydrate The tridentate macrocyclic ligands 1,4,7-triazacyclononane, its thia analogue 1,4.7-trithia-cyclononane, l-oxa-4,7-diazacyclononane, and N,N',N"-trimethyl-l ,4,7-triazacyclononane react with Re(CO) 5 Br in dimethylformamide to yield colorless, air-stable [LRe(CO) 3 ]Br complexes (L = tridentate macrocycle). With Mn(CO) 5 Br only the cyclic amines react to af-ford yellow-orange [LMn(CO),]Br complexes whereas 1.4,7-trithiacyclononane does not give stable complexes of manganese. The crystal structures of [([9]aneN 3)Re(CO) 3 ](NCS) and [([9]aneS 3)Re(CO) 3 ]Br-1/2 H : 0 have been determined. The former crystallizes in the orthorhom-bic space group Pbca (a = 12/763(4), b = 12.662(5), c = 17.472(9) Ä; Z = 8); whereas the latter crystallizes in the monoclinic space group P2,/c (a = 9.444(1). b = 11.797(2), c = 28.095(3) Ä. ß = 90,86(1); Z = 8). 
  Reference    Z. Naturforsch. 43b, 299—305 (1988); eingegangen am 9. Oktober 1987 
  Published    1988 
  Keywords    Crystal Structure, 1, 4, 7-Triazacyclononane 1, 47-Trithiacyclononane Complexes 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0299.pdf 
 Identifier    ZNB-1988-43b-0299 
 Volume    43 
58Author    Rene Csuk, BrigitteI. GlänzerRequires cookie*
 Title    Biocatalytical Transformations, III [1] Regioselective Enzymic Deacetylations of Laevoglucosane Triacetate  
 Abstract    Several hydrolytic enzymes (porcine liver esterase, lipase from wheat germ type I, and the lipase from rhizopus javanicus) efficiently deacetylate laevoglucosane triacetate (2) with good re-gioselectivity into diacetylated laevoglucosane derivatives (3—5). 
  Reference    Z. Naturforsch. 43b, 1355—1357 (1988); received June 3 1988 
  Published    1988 
  Keywords    1, 6-Anhydro Sugar, Laevoglucosane Triacetate, Deacetylation, Enzymes, Lyophilized Yeast 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1355.pdf 
 Identifier    ZNB-1988-43b-1355 
 Volume    43 
59Author    G.Erhard Himbert, Dieter Faul, Michael BarzRequires cookie*
 Title    Cycloadditionen, XIX [1] Umsetzungen von Butadiinyl-und Hexatriinyl-amin-Derivaten mit Nitriloxiden Cycloadditions, XIX [1] Reactions of Butadiynyl-and Hexatriynyl-amine Derivatives with Nitrile Oxides  
 Abstract    Butadiyn-and hexatriynamines l a -g , bearing silyl-, trichlorvinyl-and amino groups, resp. in the co-position o f their acetylenic system add nitrile oxides 3 at their first C/C-triple bond to give the 5-am inoisoxazoles 4, whereas the analogous oligoynam ines 11—1, bearing a hydrogen in the co-position, add the nitrile oxides 3 at their terminal C/C-triple bond to give the 
  Reference    Z. Naturforsch. 46b, 955 (1991); eingegangen am 15. N ovem ber 1990 
  Published    1991 
  Keywords    Butadiynyl-, Hexatriynyl-amines, Isoxazoles, Cycloaddition, 1, 3-Addition, Cyclization 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-0955.pdf 
 Identifier    ZNB-1991-46b-0955 
 Volume    46 
60Author    Michael Feist, Sergej Trojanov, Erhard KemnitzRequires cookie*
 Title    Die Kristallstrukturen von 1,4-Dimethylpiperazinium-tetrabromo- cobaltat(II) und -zinkat(II), (dmpipzH2) [Mn Br4] (M = Co, Zn)  
 Abstract    The Crystal Structures of 1,4-Dimethylpiperazinium Tetrabromocobaltate(II) and -Zincate(II), (dmpipzH2) [MHBr4] (M = Co, Zn) The compounds (dmpipzH2)[MnBr4] (M = Co, Zn) crystallize at room temperature from equi-molar solutions of 1,4-dimethylpiperazine and MBr2 • n H20 in 3M HBr. (dmpipzH2)[CoBr4] is isotypic with the homologous chlorometalates of Co and Zn and crystallizes in the mono­ clinic space group P2,/m with a = 6.424(3), b = 14.588(6), c = 7.102(6) A, ß = 90.87(6)°, Z = 2. (dmpipzH2)[ZnBr4], however, crystallizes in the monoclinic space group P2,/c with a = 7,605(5), b = 13,760(9), c = 13,286(7) Ä, ß = 93,03(6)°, Z = 4. Both structures con­ tain centrosymmetric cations (dmpipzH2)2+ in the chair form and slightly distorted tetrahedra [MBr4]2~ with a mirror plane in the case ofM = Co. Several distances N- • -Brin both structures are interpreted in terms of N-H- • Br hydrogen bonds which are favoured by the packing in the case of M = Zn. 
  Reference    (Z. Naturforsch. 51b, 9—13 [1996]; eingegangen am 12. Juni 1995) 
  Published    1996 
  Keywords    1, 4-Dimethylpiperazinium Tetrabromometalates(II), Cobalt, Zinc, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0009.pdf 
 Identifier    ZNB-1996-51b-0009 
 Volume    51