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1Author    J. CadetRequires cookie*
 Title    Steady State Radiolysis of Aqueous Aerated Solutions of 5,6-Dihydrothymine. Identification of the Major Degradation Products  
 Abstract    The major radiation-induced degradation products of 5.6-dihy dro thymine (1) in aqueous solutions saturated either with O2 or N2O/O2 (75/25 v/v) were identified as thymine (10), the trans-and cis-isomers of 6-hydroperoxy-5,6-dihydrothymine (5, 7), 5-hydroperoxy-5,6-dihydrothymine (9), and their corresponding hydroxy derivatives (4, 6, 8). The formation of these compounds is explained in terms of initial H-abstraction from the C(5) and C(6) carbons which gives rise respectively to the transient 5-yl and 6-yl radicals. Thymine hydroxy-hydroperoxides (11-14) and their decomposition products (17-20), which are derived from hydroxyl radical attack at the 5,6-ethylenic bond of thymine (10), were also characterized. 
  Reference    Z. Naturforsch. 35b, 1579—1583 (1980); received May 9 1980 
  Published    1980 
  Keywords    5, 6-Dihydrothymine, Hydroperoxides, Dihydropyrimidyl Radicals 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1579.pdf 
 Identifier    ZNB-1980-35b-1579 
 Volume    35 
2Author    E. Hanecker, H. NöthRequires cookie*
 Title    Beiträge zur Chemie des Bors, 163 [1] Die Molekülstruktur zweier Silaborazine Contributions to the Chemistry of Boron, 163 [1] The Molecular Structure of Two Silaborazines  
  Reference    Z. Naturforsch. 40b, 717—721 (1985); eingegangen am 4. Januar 1985 
  Published    1985 
  Keywords    2, 3, 4, 5, 6-Pentamethyl-l, l-diphenyl-l-silaborazine, 2, 4, 5, 6-Tetramethyl-l, l, 3, 3-tetraphenyl-l, 3-disilaborazine, X-Ray Structure 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0717.pdf 
 Identifier    ZNB-1985-40b-0717 
 Volume    40 
3Author    Hans Möhrle, Heinz DwuletzkiRequires cookie*
 Title    Acylation Reactions of Enamines  
 Abstract    The ratio of isomeric enaminones, obtained by acylation of enamines with acid chlorides in the presence of triethylamine, depends on the possibility of forming isomeric enoles of the inter-mediate cyclobutanone adducts. 
  Reference    Z. Naturforsch. 42b, 503—506 (1987); eingegangen am 30. Oktober 1986 
  Published    1987 
  Keywords    Enamines, Enaminones, 1, 4, 5, 6-Tetrahydropyridines 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0503.pdf 
 Identifier    ZNB-1987-42b-0503 
 Volume    42 
4Author    Macki Kaloga, Ilona ChristiansenRequires cookie*
 Title    Photodimerisierung von 6-fra/is-Styryl-4-methoxy-2-pyron (= 5.6-Dehydrokawain), 1. Mitteilung Photodimerisation of 64raw6-Styryl-4-methoxy-2-pyrone (= 5,6-Dehydrokawain)  
  Reference    Z. Naturforsch. 36b, 505—507 (1981); eingegangen am 22. Dezember 1980 
  Published    1981 
  Keywords    Piper methysticum G Forst, Photodimerisation, 5, 6-Dehydrokawain, /?-Truxinic Acid Structure 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0505.pdf 
 Identifier    ZNB-1981-36b-0505 
 Volume    36 
5Author    Macki Kaloga, Ilona ChristiansenRequires cookie*
 Title    Photodimerisation of 6 -1 rans-Styry 1 -4 -methoxy-2 -pyr one (= 5,6-Dehydrokawain) and cis-Isomerisation of (±)-Kawain  
 Abstract    The photochemical transformation of 5,6-Dehydrokawain (1) to rel-(lR,6S,7S,8S)-5-methoxy-7-phenyl-8-[6-(4-methoxy-2-pyronyl)]-l-(E)-styryl-2-oxabicyclo[4,2,0]octa-4-en-3-one (2) by irradiation with a light bulb [1] is con-firmed. Kawain (3) turns out to be resistent to photochemical reaction in several tests. During irradiation by a Hg-lamp a transformation to cis-Kawain (4) takes place, however. 
  Reference    Z. Naturforsch. 38b, 658—659 (1983); eingegangen am 13. November 1982 und 31. Januar 1983 
  Published    1983 
  Keywords    Aniba-Dimer-A, 5, 6-Dehydrokawain, cis-Kawain, Photodimerisation, Photoisomerisation 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0658_n.pdf 
 Identifier    ZNB-1983-38b-0658_n 
 Volume    38 
6Author    Requires cookie*
 Title    Darstellung und Kristallstruktur von 2  
  Reference    (Z. Naturforsch. 47b, 1 [1992]) 
  Published    1992 
  Keywords    4, 6-Triferrocenyl-1, 3, 5, 2, 4, 6-triselenatriborinan 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0001.pdf 
 Identifier    ZNB-1992-47b-0001 
 Volume    47 
7Author    M. Athias, O. Senge, KevinM. SmithRequires cookie*
 Title    -octaethyl-porphodimethene-thallium(III) Chloride  
 Abstract    The crystal structure of the title com pound was determined in order to obtain structural information on a tetrapyrrole bearing meso-oxo-functions. C36H 4,N 40 2T1C1 • C H 3OH, P 1, a = 10.358(2), b = 12.344(3), c = 15.490(3) Ä, a = 84.36(2)°, ß = 78.53(2)°, y = 82.26(2)°, V = 1918.2(7) Ä3, Z = 2, 130 K, R = 0.04 for 6749 reflections with I > 4er(I). The structure consists of the penta-coordinated thallium ligated by the four nitrogens of the porphodimethene ligand and a chloride in the axial position. The central macrocycle shows some degree of ruffling with the carbonyl groups pointing slightly above and below the mean plane of the molecule. 
  Reference    Z. Naturforsch. 47b, 837—841 (1992); received December 5 1991 
  Published    1992 
  Keywords    /F ebruary 28, 1992 Crystal Structure, 5, 15-Dioxo-porphodimethene, Tetrapyrroles, Oxoporphyrins 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0837.pdf 
 Identifier    ZNB-1992-47b-0837 
 Volume    47 
8Author    Giorgio Malesani, Ugo Quintily, Gianfranco ChiarelottoRequires cookie*
 Title    345 G. Malesani et al. * Keto-enol Tautomerism in 4,7-Dioxo-4,5,6,7-tetrahydroindoles  
 Abstract    The tautomeric equilibria of 4,7-dioxo-4,5,6,7-tetrahydroindoles have been investigated by nuclear magnetic resonance spectroscopy. Proton chemical shift measurements have been made for a series of alkyl or arylindole derivatives, and equilibrium constants ([enol]/[keto]) have been determined. The effect of solvent on the enol-keto equilibria has been studied. 
  Reference    Z. Naturforsch. 34b, 333—338 (1979); received September 8 1978 
  Published    1979 
  Keywords    Keto-enol Tautomerism, 4, 7-Dioxo-4, 5, 6, 7-tetrahydroindoles, 4, 7-Dihydroxyindole Derivatives 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0333.pdf 
 Identifier    ZNB-1979-34b-0333 
 Volume    34 
9Author    Detlef GeffRequires cookie*
 Title    Imidazole Catalyzed Transformation of 2-Arylmethylperhydro-l,5,2-dioxazine- 3,6-diones into 4-Oxazolidinones  
  Reference    Z. Naturforsch. 38b, 531—534 (1983); eingegangen am 23. November 1982 
  Published    1983 
  Keywords    2 -Ary lmethy lperhydro -1, 5, 2 -dioxazine -3, 6-diones, Imidazole, Thermolysis, 4-Oxazolidinones, Glyoxylamides 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0531_n.pdf 
 Identifier    ZNB-1983-38b-0531_n 
 Volume    38 
10Author    Detlef GeffkenRequires cookie*
 Title    3-Hydroxy-, 3-Alkoxy-und 3-Amino-2-thioxooxazolidin-4-one aus 6 -Thioxoperhydro -1.5.2-dioxazin -3 -onen 3-Hydroxy-, 3-Alkoxy-and 3-Amino-2-thioxooxazolidine-4-ones from 6-Thioxoperhydro-1,5,2-dioxazine-3-ones  
  Reference    Z. Naturforsch. 38b, 1008—1014 (1983); eingegangen am 5. Mai 1983 
  Published    1983 
  Keywords    Glycolohydroxamic Acids, l, l'-Thiocarbonyldiimidazole, 6-Thioxoperhydro-1, 5, 2-dioxazine-3-ones, Ring Transformation 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1008.pdf 
 Identifier    ZNB-1983-38b-1008 
 Volume    38 
11Author    Z. NaturforschRequires cookie*
 Title    Filippo Imperato  
 Abstract    A new pentaoxigenated xanthone has been iso­ lated from aerial parts o f the fern Cystopteris fra­ gilis. By spectroscopic and chemical methods this compound has been shown to be 1,6-dihydroxy-3,5,7-trimethoxyxanthone which is o f biosynthetic interest in ferns. 
  Reference    Z. Naturforsch. 45b, 1603—1604 (1990); received June 1 1990 
  Published    1990 
  Keywords    Cystopteris fragilis, Pteridophyta, Aspleniaceae, 1, 6-Dihydroxy-3, 5, 7-trimethoxyxanthone 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1603_n.pdf 
 Identifier    ZNB-1990-45b-1603_n 
 Volume    45 
12Author    HansM. Öhrlea, K. Arin Bluhme-Hensena, BirgitM. Iddelhauveb, DietrichM. Ootzb, H. Artm, W. Underlich15Requires cookie*
 Title    Cyclisierung von Amidoximen mit Oxybis(diphenylboran) Cyclization of Amidoximes with Oxybis(diphenylborane)  
  Reference    Z. Naturforsch. 46b, 1219—1222 (1991); eingegangen am 2. April 1991 
  Published    1991 
  Keywords    Am idoxim es, 2, 3-D ihydro-l, 3, 5, 2-oxadiazaborol Derivatives, Crystal Structure 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1219.pdf 
 Identifier    ZNB-1991-46b-1219 
 Volume    46 
13Author    Konstantina Kehagia, Alexander Dömling, Ivar Ugi, Wolfgang Hiller, Jürgen RiedeRequires cookie*
 Title    N e w Synthesis and Structure Determination o f 13-Aza-4,-trioxatricyclo[7,3>l?05'13]tridecane  
 Abstract    A new 13-Aza-4,4,8,8,12,12-hexamethyl-2,6,10-trioxatricyclo[7,3,l,05'13]tridecane synthesis and the crystal structure are reported. It crystallizes in the monoclinic space group P2Jn with a = 1201.9(1) pm, b = 1436.6(1) pm, c = 1726.2(2) pm, ß = 90.74(1)° and Z = 8. 
  Reference    Z. Naturforsch. 50b, 667—670 (1995); received August 2 1994 
  Published    1995 
  Keywords    Asinger Condensation, C3-Symmetric Heterocycle, 5, 6-Dihydro-2//-l, 3-oxazine, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0667.pdf 
 Identifier    ZNB-1995-50b-0667 
 Volume    50 
14Author    HamishG. GrantRequires cookie*
 Title    Studies of the Reaction of Various 1,2-Disubstituted Benzenes with Crotonic Acid in Polyphosphoric Acid  
  Reference    Z. Naturforsch. 34b, 728—733 (1979); received November 27 1978 
  Published    1979 
  Keywords    5, 6-Disubstituted Indan-l-ones, Crotonic Acid, Polyphosphoric Acid, 1-Methyl Benzofurocyclopentan-3-one, 13 C NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0728.pdf 
 Identifier    ZNB-1979-34b-0728 
 Volume    34 
15Author    Winfried Hinrichs, Jürgen Kopf, Klaus-Wilhelm Stender, Günter KlarRequires cookie*
 Title    Selbststapelnde Systeme, I 4 a Compound with Radical Cations and Polyiodide Chains  
 Abstract    ,4' ,5,5'-Tetramethoxy-2,2'-dithiobiphenyl-Iod (6/7), eine Verbindung mit Radikalkationen und Polyiodidketten Selfstacking Systems, I 4,4',5,5'-Tetramethoxy-2,2'-dithiobiphenyl-Iodine (6/7), 
  Reference    (Z. Naturforsch. 40b, 39—44 [1985]; eingegangen am 20. September 1984) 
  Published    1985 
  Keywords    4, 4', 5, 5'-Tetramethoxy-2, 2'-dithiobiphenyl-Iodine (6/7), Molecular and Crystal Structure, Self-stacking Systems, Polyiodide Chains 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0039.pdf 
 Identifier    ZNB-1985-40b-0039 
 Volume    40 
16Author    Klaus-Wilhelm Stender, Günter Klar, Dierk KnittelRequires cookie*
 Title    Elektrochemisches Verhalten von Dibenzodichalkogeninen und verwandten Verbindungen Electrochemical Behavior of Dibenzodichalcogenins and Related Compounds  
  Reference    Z. Naturforsch. 40b, 774—781 (1985); eingegangen am 8. März 1985 
  Published    1985 
  Keywords    Thianthrenes, Selenanthrenes, 2, 2'-Dithiobiphenyls, Cyclic Voltammetry, 4, 4', 5, 5'-Tetramethoxy-2, 2'-dithiobiphenyl 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0774.pdf 
 Identifier    ZNB-1985-40b-0774 
 Volume    40 
17Author    Rainer Gast, ThomasK. Aukorat, Ion Neda, Reinhard SchmutzlerRequires cookie*
 Title    Das 2-Halogen-5,6-benzo-1,3>2-dioxaphosphorinan-4-on-Ringsystem The 2-Halogeno-5,6-benzo-l,3,2-dioxaphosphorinan-4-one Ring System  
 Abstract    The reaction of salicylic acid with phosphorus trichloride furnished the previously known 2-chloro-5,6-benzo-l,3,2-dioxaphosphorinan-4-one heterocycle 1 which was unambiguously characterized, for the first time, by N M R spectroscopy and mass spectrometry. The fluorine and bromine analogues of 1, 2 and 3 were synthesized from 1, using exchange reactions. The iodo derivative, 4, owing to its instability, could be identified only in the reaction mixture by 'H and 31P N M R spectroscopy. The amine derivatives 5 -8 were obtained from 1 using stand­ ard exchange reactions, either with silylated amines or with secondary amines in the presence of base. There was no evidence by 'H N M R spectroscopy for intram olecular M e ,N -»P coordi­ nation in 6. The 31P N M R investigation of 7 revealed the presence o f two rotational isomers, presumably as a result of steric hindrance at the P -N bond by the methyl substituent of the piperidine group. The reaction of 6 with methyl iodide led to m ethylation at the nitrogen atom of the Me2N group, producing the ammonium iodide, 9. The reactions o f 5, 6 and 8 with nor-bornadiene tetracarbonyl molybdenum failed to furnish isolable products. 
  Reference    Z. Naturforsch. 48b, 867—874 (1993); eingegangen am 2. September 1992 
  Published    1993 
  Keywords    5, 6-Benzo-l, 3, 2-dioxaphosphorinan-4-one Derivatives, Halogen Substitution, Dialkylamino Substituents, R otational Isomers 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0867.pdf 
 Identifier    ZNB-1993-48b-0867 
 Volume    48 
18Author    Ralf Sonnenburg, Ion Neda, Axel Fischer, PeterG. Jones, Reinhard SchmutzlerRequires cookie*
 Title    Verbindungen mit dem 5,6-Benzo-l,3,2-diazaphosphorinan-4-on-Ringsystem: Synthese von 2-Chlor-, 2-N,N-dimethylamino-und 2-Bis-(2-chlorethyl)amino- substituierten Derivaten mit drei-und vierfach koordiniertem Phosphor Compounds Involving the 5,6-Benzo-l,3,2-diazaphosphorinane-4-one Ring System: Synthesis of 2-Chloro-, 2-N,N-dimethylamino-and 2-Bis-(2-chloroethyl)amino- Substituted Derivatives with Three-and Four-Coordinated Phosphorus  
  Reference    Z. Naturforsch. 49b, 788—8 (1994); eingegangen am 16. D ezem ber 1993 
  Published    1994 
  Keywords    5, 6-Benzo-l, 3, 2-diazaphosphorinan-4-one Derivatives, Dialkylamino Substituents, Bis-(2-chloroethyl)amino Substituents, Platinum Complex, NM R Spectra 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0788.pdf 
 Identifier    ZNB-1994-49b-0788 
 Volume    49 
19Author    Stephan Friederichs, Jens Kudnig, Günter KlarRequires cookie*
 Title    Elementorganische Verbindungen mit o-Phenylenresten, XXVIII [1] Charge-transfer  
 Abstract    Komplexe von 2,3,7,8-Tetraalkoxy-chalkogenanthrenen mit 7,7,8,8-Tetracyan-2,3?5,6-tetrafluor-chinodimethan Organometalloidal Compounds with o-Phenylene Substituents, Part XXVIII [1] Charge-Transfer Complexes of 2,3,7,8-Tetraalkoxy-chalcogenanthrenes wjth,3,5,6-tetrafluoro-quinodimethane -selenanthrene, as well as -tetraethoxythianthrene gi­ ve isostructural 1:1 charge-transfer complexes with 7,7,8,8-tetracyano-2,3,5,6-tetrafluoro-quinodimethane. In the columnar crystal structures there are alternating donor and acceptor molecules. The chalcogenanthrene molecules which are folded at their E -E axes in the pure state, are planar in the complexes indicating a charge-transfer according to [donor]+ [acceptor]-. Consecutive molecules of the stacks are arranged in such a way that an optimum overlap of the HOMO of the donor and the LUMO of the acceptor, both of which are of 7T-type character according to MNDO calculations, is secured. 
  Reference    Z. Naturforsch. 51b, 1295—1300 (1996); eingegangen am 1. April 
  Published    1996 
  Keywords    Tetracyano-2, 3, 5, 6-tetrafiuoro-quinodi-methane, 1:1 Charge-Transfer Complexes, Columnar Structures, MNDO Calculations 2, 3, 7, 8-Tetramethoxythianthrene and 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1295.pdf 
 Identifier    ZNB-1996-51b-1295 
 Volume    51 
20Author    Ferdinand BelajRequires cookie*
 Title    Struktur von C2C16N4P2, dem R eaktionsprodukt von D icyandiam id mit PC15 Structure of C 2C16N4P2, the Reaction Product of Dicyandiamide with PC15  
 Abstract    The reaction product of dicyanodiamide with PC15 (1:2) is 2,2,4-trichloro-2,2-dihydro-6-trichlorophosphazeno-1.3,5,2A5-triazaphosphorine and not 2.4,6-trichloro-2,2-dihydro-2-trichlorophosphazeno-l,3,5,2A5-triazaphosphorine as reported in the literature. This is con­ firmed by an X-ray structure determination at 90K: Space group P 2,/c, a = 17.258(5), b = 9.664(3), c = 15.070(4) Ä, ß = 114.05(2)°, Z = 8, R = 3.99%. Both molecules of the asymmetric unit show about the same conformation with approximate C s-m -symmetry as was also obtai­ ned by semi-empirical MNDO calculations. The thermal motion analysis establishes that the molecules cannot be described as 'rigid bodies', and that the easy deformability of the exocyclic C-N-P angles allows the 'rigid' NPC13 tetrahedra to perform almost isotropic librations. 
  Reference    Z. Naturforsch. 51b, 1428—1432 (1996); eingegangen am 20. Februar 1996 
  Published    1996 
  Keywords    2, 24-Trichloro-2, 2-dihydro-6-trichlorophosphazeno-l, 3, 5, 2A5-triazaphosphorine Phosphaze­ ne, Crystal Structure, Thermal Motion Analysis 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1428.pdf 
 Identifier    ZNB-1996-51b-1428 
 Volume    51