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61Author    Etelka Farkas, BedaE. Fischer, Rolf Griesser, VolkerM. Rheinberger, Helmut SigelRequires cookie*
 Title    Ternary Complexes in Solution, XXX [1] Increased Stability Through Intramolecular Stacking in Mixed-Ligand Cu 2+ and Zn 2+ Complexes of 2,2' -Bipyridyl and Carboxymethyl Aryl Derivatives  
 Abstract    The stability constants of ternary Cu 2+ and Zn 2+ complexes, each of which contains 2,2'-bipyridyl and a carboxymethyl aryl sulfide, were determined in 50% aqueous dioxane. A comparison of the stability of these ternary complexes with those formed with simple carboxylates demonstrates an enhanced stability of the carboxymethyl aryl sulfide containing mixed ligand complexes. This enhanced stability is not due to a thioether-metal ion interaction, but due to an intramolecular aromatic stacking interaction between the aryl moiety of the carboxymethyl aryl sulfide and 2,2'-bipyridyl. Indeed, by UV difference spectra and by PMR measurements it is possible to show that a binary (metal ion-free) stacked adduct between the aromatic moieties of the two mentioned ligands is formed. Furthermore, by studying the binary and ternary systems of Zn 2+ or Cu 2+ , 2,2'-bipyridyl and hydrocinnamate, i.e. 3-phenylpropionate (-S-of carboxymethyl phenyl sulfide is replaced by -CH2-), it becomes obvious that the thioether moiety is not essential for the observation of an enhanced stability of the ternary complexes. PMR shift studies of 2,2'-bipyridyl/Zn 2+ /carboxymethyl aryl sulfide systems confirm the presence of stacking in the corresponding ternary complexes. Depending on the kind of the ternary metal ion complex the stability enhancement, due to the intramolecular stacking between the aro-matic parts of the coordinated ligands, is between about 0.2 to 0.5 log unit. 
  Reference    Z. Naturforsch. 34b, 208—216 (1979); received September 1 1978 
  Published    1979 
  Keywords    Mixed-Ligand Complexes, Stacking Interactions, 2, 2'-Bipyridyl, 3-Phenylpropionate, Carboxymethyl Aryl Sulfides 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0208.pdf 
 Identifier    ZNB-1979-34b-0208 
 Volume    34 
62Author    JaapG. Haasnoot, WillemL. GroeneveldRequires cookie*
 Title    Complexes of 1,2,4-Triazoles, VII [1] Preparation and Vibrational Spectra of 4,4'-Bi-l,2,4-triazole and Some of its Complexes with Transition Metal(II) Thiocyanates  
 Abstract    The preparation and characterization of 4,4'-bi-l,2,4-triazole is described. The com-pound is a strong, polydentate, polynucleating nitrogen donor. Two complexes, M(btr)2(NCS)2H20 M = Co, Ni, are described. The vibrational spectra of ligand and complexes are compared. A structure for the complexes is proposed. 
  Reference    Z. Naturforsch. 34b, 1500—1506 (1979); received July 2 1979 
  Published    1979 
  Keywords    4, 4'-Bi-l, 2, 4-triazole, IR, Ligand Field, Polynuclear Complexes 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1500.pdf 
 Identifier    ZNB-1979-34b-1500 
 Volume    34 
63Author    Marianne Baudler, Jochen HellmannRequires cookie*
 Title    Contributions to the Chemistry of Phosphorus, 89 [1] Cyclization of a 1,3-Dihalogen-1,2,3- triorganyltriphosphane to the Corresponding Triorgany 1-cy clotriphosphane  
 Abstract    Tri-Jerf-butyl-cyclotriphosphane is obtained by the dehalogenation of l,3-diiodo-l,2,3-tri-£erf-butyl-triphosphane with lithiumhydride. This reaction represents a so far unknown type of ring-closure leading to cy clotriphosphanes, which corresponds to the classical synthesis of cyclo -propanes starting from 1,3-dichloropropanes. 
  Reference    Z. Naturforsch. 36b, 266—267 (1981); eingegangen am 13. Oktober 1980 
  Published    1981 
  Keywords    1, 3-Dihalogen-1, 2, 3-triorganyltriphosphanes, Cy clotriphosphanes, Tri-feri-butylcyclotriphosphane 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0266_n.pdf 
 Identifier    ZNB-1981-36b-0266_n 
 Volume    36 
64Author    Ger Vos, JaapG. Haasnoot, WillemL. GroeneveldRequires cookie*
 Title    Complexes of 1,2,4-Triazoles, Part XVI Binuclear Complexes of Transition Metal(II)thiocyanates with 4-Ethyl-l,2,4-triazole  
 Abstract    Coordination compounds of 4-ethyl-l,2,4-triazole (Ettrz) with Mn, Fe, Co, Ni, Cu and Zn are reported. The compounds have been identified and characterized by chemical analyses, infrared and ligand field spectra, electron paramagnetic resonance (e.p.r.) measurements, magnetic susceptibility measurements and thermoanalytical experiments. Except for the Cu compound, which is polynuclear, all compounds appear to be binuclear, with both bridging bidentate and non-bridging triazole ligands. The overall formula is M(Ettrz)2(NCS)2(H20)3/2 for Mn, Fe, Co and Ni. The copper and zinc compounds have the formula Cu(Ettrz)2(NCS)2 and Zn(Ettrz)3/2(NCS)2. 
  Reference    Z. Naturforsch. 36b, 802—808 (1981); received March 2 1981 
  Published    1981 
  Keywords    4-Ethyl-l, 2, 4-triazole, Ligand Field, Magnetic Exchange, Binuclear Complexes 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0802.pdf 
 Identifier    ZNB-1981-36b-0802 
 Volume    36 
65Author    Marianne Baudler, Gabi KuppratRequires cookie*
 Title    Beiträge zur Chemie des Phosphors, 113 [1, 2] Synthese und Eigenschaften des Azadiphosphirans (f-BuP)2N(i-Pr) Contributions to the Chemistry of Phosphorus, 113 [1, 2] Synthesis and Properties of the Azadiphosphirane (£-BuP)2N(i-Pr)  
  Reference    Z. Naturforsch. 37b, 527—530 (1982); eingegangen am 7. Dezember 1981 
  Published    1982 
  Keywords    l-Isopropyl-2, 3-di-Zer£-butyl-l, 2, 3-azadiphosphirane, Azadiphosphacyclopropanes, Cycloazaphosplianes, Heterocyclophosphanes 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0527.pdf 
 Identifier    ZNB-1982-37b-0527 
 Volume    37 
66Author    Wolfgang Sucrow, Hans-Walter MüllerRequires cookie*
 Title    2.5-Dihydro-und Tetrahydro-2.2-dimethyl-3-thiophenaldehyd 2,5-Dihydro-and Tetrahydro-2,2-dimethjd-3-thiophenealdehyde  
  Reference    Z. Naturforsch. 37b, 851—854 (1982); eingegangen am 18. Februar 1982 
  Published    1982 
  Keywords    2, 5-Dihydro-2, 2-dimethyl-3-thioplienealdehyde, Tetrahydro-2, 2-dimethyl-3-thiophenealdehyde 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0851.pdf 
 Identifier    ZNB-1982-37b-0851 
 Volume    37 
67Author    TonyD. Ebaerdem AekerRequires cookie*
 Title    Versuche zur Synthese 2  
 Abstract    2'-disubstituierter ds-Bis(phenyl)bis(triphenylphosphan)pIatin(II)-Verbindungen und Kristallstruktur des ds-Bis(2-nitrophenyl)bis(triphenylphosphan)platin(II) On the Form ation of 2,2'-D isubstituted ds-B is-(phenyl)bis(triphenylphosphane)platinum (II) Compounds and Crystal Structure D eterm ination of ds-B is(2-nitrophenyl)bis(triphenylphosphane)platinum (II) H ans-A lbert Brune* und M anfred Wiege Lehrstuhl für Organische C hem ie I der U niversität U lm . D-7900 U lm /D onau und 
  Reference    Z. Naturforsch. 39b, 359 (1984); eingegangen am 8. August 1983 
  Published    1984 
  Keywords    2, 2'-D isubstituted Phenyl-Platinum C om pounds, Syntheses, Crystal Structure, M olecular Structure 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0359.pdf 
 Identifier    ZNB-1984-39b-0359 
 Volume    39 
68Author    Alfred Gieren, Viktor Lamm, RobertC H Addon, M. Artin, L. Kaplan, M.John Perkins, Peter FlowerdayRequires cookie*
 Title    Vergleichende Röntgenstrukturanalysen von Naphthothiadiazinen und isovalenzelektronischen Naphthotriazinen-I-nstitut für B iochem ie, A bt. Strukturforschung I, D-8033 Martinsried  
 Abstract    Röntgenstrukturanalysen von Acenaphthyleno[5,6-cd][l,2,6]-thiadiazin, 2-Methyl-2 H-acenaphthyleno[5,6-de]-l,2,3-triazin und Naphtho[l,8-de]thiadiazin Comparison of Naphthothiadiazines and Isoelectronic Naphthotriazines by X-Ray Structural Analysis X-Ray Structural Analyses of A cenaphthyleno[5,6-cd][l,2,6]thiadiazine, 2-M ethyl-2H -acenaphthyleno[5,6-de]-l,2,3-triazine and N ap h th o [l,8-de]thiadiazine We have performed an X-ray structural analysis of the sulphur diimide 1 and the isoelectronic triazine 2. In addition we found two crystal m odifications o f the sulphur diimide 3, which is an analogue o f the previously characterized 4, but the m odification suitable for X-ray analysis (tetra­ gonal, ß) was disordered. From the bond lengths o f 1 and 2 results, that in both cases there is only 
  Reference    Z. Naturforsch. 39b, 975 (1984); eingegangen am 27. D ezem ber 1983 
  Published    1984 
  Keywords    Sulphur D iim ides, 1, 2, 3-Triazines, X -R ay, Bonding Relationships 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0975.pdf 
 Identifier    ZNB-1984-39b-0975 
 Volume    39 
69Author    Klaus Stumpf, Walter Siebert, Roland Köster, Günter SeidelRequires cookie*
 Title    Reaktionen von 2,3-Dihydro-l,3-diborolen mit Kalium und Iodmethan. Charakterisierung der Produkte als (C 5 H 5 )Co-Komplexe [1]  
 Abstract    The reactions between 2,3-dihydro-l,3-diborole derivatives 1 and potassium in tetrahydrofuran yield dark brown solutions. Without elimination of hydrogen, 1.4 to 1.8 moles of potassium are consumed by one mole of 1. Reduced 1 and iodomethane react to give methylated products, identified by GC/MS studies. Complexation with (C 5 H 5)Co(C 2 H 4) 2 leads to the cyclopentadienyl-cobalt complexes 2, iso-2, 3, and 4, of which iso-2 is a new cobalt-hydride sandwich. Methylation reactions of the cobalt sandwich anions (2-H)~ are reported. 
  Reference    Z. Naturforsch. 42b, 186—190 (1987); eingegangen am 4. Juli 1986 
  Published    1987 
  Keywords    2, 3-Dihydro-l, 3-diboroles, Cobalt Sandwich Complexes, Cobalt-Hydride Complexes 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0186.pdf 
 Identifier    ZNB-1987-42b-0186 
 Volume    42 
70Author    Werner Schnurr, Manfred RegitzRequires cookie*
 Title    Phosphorverbindungen ungewöhnlicher Koordination, 31 [1] Cycloaddition von Diazoverbindungen an ein P—Chlor-phosphaalken Phosphorus Compounds with Unusual Coordination, 31 [1] Cycloaddition of Diazo Compounds onto a P—Chloro-phosphaalkene  
 Abstract    Chloro bis(trimethylsilyl)methylene phosphane (4) reacts with the diazo compounds 5, 10, 15 and 20 even at low temperatures with formation of the 3H-l,2,4-diazaphospholes 6,11,16 and 21. The products are unstable and decompose either with elimination of nitrogen to yield 1-chloro phosphiranes (9,14, 19 and 22), or isomerize with aromatization (11 —> 13) or transformation into 4,5-dihydro-l,2,4-diazaphospholes (6—> 8, 16—» 18) by trimethylsilyl shifts. Silyl groups attached to ring nitrogen are easily hydrolized (8 —> 7,13 —» 12, 18 —> 17), those attached to ring carbon are cleaved by treatment with potassium fluoride in dimethyl formamide (7 —> 23, 12 —> 24). 
  Reference    Z. Naturforsch. 43b, 1285—1292 (1988); eingegangen am 20. Juni 1988 
  Published    1988 
  Keywords    Chloro-methylene Phosphanes, Diazo Compounds, 1, 2, 4-Diazaphospholes, 1-Chlorophosphiranes 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1285.pdf 
 Identifier    ZNB-1988-43b-1285 
 Volume    43 
71Author    Jan Böm, G. Erd, Heppke, A. Ndreas RanftRequires cookie*
 Title    Synthese und ferroelektrische Eigenschaften chiraler Ester von 2,5-Diphenylpyrimidinen mit a-Fluorcarbonsäuren Synthesis and Ferroelectric Properties of 2,5-Diphenylpyrimidines with Different a-Fluorocarboxylic Acids  
 Abstract    Chiral esters of 2-[4-/?-hexylphenyl]-5-[4-hydroxyphenyl]pyrimidine and 2-[4-w-hexyloxy-phenyl]-5-[4-hydroxyphenyl]pyrimidine with four different a-fluorocarboxylic acids have been synthesized. The spontaneous polarization and the tilt angles in the smectic C* phase were m easured as a function of tem perature. All compounds exhibit wide range smectic C* phases, the highest values of the spontaneous polarization being about 400 nC/cm: . Additionally the spon­ taneous polarization in a higher ordered smectic phase was determ ined, the values ranging up to about 600 nC/cm2. The spontaneous polarization/tilt angle ratio strongly increases with decreasing tem perature. 
  Reference    Z. Naturforsch. 44b, 1127—1131 (1989); eingegangen am 6. März 1989 
  Published    1989 
  Keywords    Liquid Crystals, Smectic Liquid Crystals, Ferroelectric Properties, Chiral cc-Fluorocarboxylic Acid E sters, 2, 5-Diphenylpyrim idines 
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 TEI-XML for    default:Reihe_B/44/ZNB-1989-44b-1127.pdf 
 Identifier    ZNB-1989-44b-1127 
 Volume    44 
72Author    M. Arianne Bäudler, JosefH. AhnRequires cookie*
 Title    Zur Existenz eines Triphosphacyclobutenid-Ions P3CH20 Contributions to the Chemistry of Phosphorus, 204 [1] On the Existence of a Triphosphacyclobutenide Ion P3C H 2e  
 Abstract    The structure o f the reaction product o f white phosphorus and sodium in diglyme which exhibits a low field AB2 system in the 31P {'H } N M R spectrum [4] has been reexamined. A c­ cording to the results o f a complete analysis o f its proton coupled 31P N M R spectrum (ABB'XX' system), the compound is the hitherto unknown 1,2,3-triphosphacyclopentadienide 
  Reference    Z. Naturforsch. 45b, 1139—1142 (1990); eingegangen am 9. Februar 1990 
  Published    1990 
  Keywords    Triphosphacyclobutenide Ion, 1, 2, 3-Triphosphacyclopentadienide Ion, Tetraphosphacyclopentadienide Ion, Phosphorus Heterocycles 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1139.pdf 
 Identifier    ZNB-1990-45b-1139 
 Volume    45 
73Author    EnriqueG. Utiérrez-PueblaRequires cookie*
  Reference    Z. Naturforsch. 46b, 1113 (1991); eingegangen am 9. Januar 1991 
  Published    1991 
  Keywords    Hexachlorodicuprates, Tetrachlorocuprates, 3-D iethylam ino-5-phenyl-1, 2, 4-dithiazolium Salts, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1113_n.pdf 
 Identifier    ZNB-1991-46b-1113_n 
 Volume    46 
74Author    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 
75Author    Ulrike Holzgrabe, Willy Friedrichsen, Rl-FH. EsseRequires cookie*
 Title    Keto-Enol-Tautomerism and Configurational Isomerism of 2,6-Disubstituted 4-Piperidone-3,5-dicarboxylates [1]  
 Abstract    The dialkyl 2,6-dialkylsubstituted 4-piperidone-3,5-dicarboxylates were synthesized by a M annich procedure. Depending on the substitution at the nitrogen keto-enol-tautomerism and a configurational isomerism at C 2 is observed. The structure o f the N-substituted piperi-done 24 E (C 18H 29N 0 5) has been determined by X-ray analysis: it is characterized by an enol structure o f the /?-ketoester and an axial position o f the alkyl group at C 2 and an equatorial one o f the alkyl group at C 6. The O -H -O hydrogen bond shows characteristic values o f a strong hydrogen bond. The N-unsubstituted piperidones adopt a ketone structure with the all-equatorial position o f all substituents. This stereochemistry is confirmed for other enolic and ketone analogues by N M R spectroscopic methods. To work out the reason for the different thermodynamic stabilities o f the different stereochemical structures o f N-substituted and N-unsubstituted piperidones, various semiempirical calculations were done for series o f simple pairs o f carbonyl/enol tautomers, substituted acetoacetates, oxoglutarate as well as o f syste­ matically varied substituted cyclohexanone, 4-oxacyclohexanone and 4-piperidone deriva­ tives. 
  Reference    Z. Naturforsch. 46b, 1237—1250 (1991); received Novem ber 2 1990 
  Published    1991 
  Keywords    2, 6-Disubstituted 4-Piperidone-3, 5-dicarboxylates, High-resolution N M R, X-Ray, Theoretical Calculations 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1237.pdf 
 Identifier    ZNB-1991-46b-1237 
 Volume    46 
76Author    Thomas Strelow, Jürgen Voss, Gunadi AdiwidjajaRequires cookie*
 Title    Preparation and Structure of Ethyl 4-Bromo-2-(diphenylmethyIene)- 3-oxo-5,5-diphenyl-4-pentenoate  
  Reference    Z. Naturforsch. 47b, 1007—7 (1992); eingegangen am 23. Dezember 1991 
  Published    1992 
  Keywords    2, 4-D im ethylene-l, 3-cyclobutandione, D ouble-bond Splitting, Crystal Structure 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1007.pdf 
 Identifier    ZNB-1992-47b-1007 
 Volume    47 
77Author    Hermann Irngartingera, Jochen Lichtenthälera, Dieter Fenskeb, Gerhard BaumbRequires cookie*
 Title    Synthesen und Strukturen von 2,5-Bis(2-arylvinyl)-l,4-benzochinonen und deren photochemisches Verhalten im Kristall Syntheses and Crystal Structures of 2,5-Bis(2-arylvinyl)-l,4-benzoquinones and their Photochemical Reactivity in the Crystalline State  
  Reference    Z. Naturforsch. 48b, 1411—1418 (1993); eingegangen am 14. Mai 1993 
  Published    1993 
  Keywords    2, 5-D istyryl-l, 4-benzoquinones, Synthesis, Crystal Structure, Solid State Photochemistry 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1411.pdf 
 Identifier    ZNB-1993-48b-1411 
 Volume    48 
78Author    FrankB. Itterer, S. Tefan, K. Ucken, KlausP. Langhans, O. Th, Ar Stelzer, W. S. SheldrickRequires cookie*
 Title    Fragmentierung und Zyklisierung disekundärer Methylenbisphosphane mit sperrigen aromatischen Resten in Fe3-und Ru3-Clustern  
 Abstract    L inear O ligophosphaalkanes, X X V II [1] F rag m en tatio n and Cyclization of D isecondary M ethylenebisphosphanes with Bulky A ro m atic Substituents in F e3 and R u 3 C lusters 
  Reference    Z. Naturforsch. 49b, 1223—1238 (1994); eingegangen am 8. März 1994 
  Published    1994 
  Keywords    D isecondary M ethylenebisphosphanes, Bulky Aromatic Substituents, Phosphinidene Fragmentation, Cyclization, 2, 3-Dihydrobenzo[b]phospholes 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1223.pdf 
 Identifier    ZNB-1994-49b-1223 
 Volume    49 
79Author    Akinori ShiotaniRequires cookie*
 Title    Die Pd-katalysierte oxidative Kupplungsreaktion von Methylbenzoesäuremethylester The Pd-Catalyzed Oxidative Coupling Reaction of Methyl Methylbenzoates  
 Abstract    The Pd-catalyzed oxidative coupling reaction of methyl o-toluate gives, in the presence of a Pd/l,10-phenanthroline(phen)/Cu catalyst, exclusively, the para-linked biphenyldicarboxy-lates 1, 2, and 3. On the other hand, the meta-linked biphenyldicarboxylates 4 and 5, were predominantly formed in a catalyst system of Pd/2,4-pentanedione(acacH)/Cu, and under similar conditions 6 and 7 were also obtained from the coupling reaction of methyl m-toluate and methyl p-toluate, respectively. A reaction scheme has been proposed. 
  Reference    Z. Naturforsch. 49b, 1731—1736 (1994); eingegangen am 21. April 1994 
  Published    1994 
  Keywords    Coupling Reaction, Steric Influence, Palladium, 1, 10-Phenanthroline, 2, 4-Pentanedione 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1731.pdf 
 Identifier    ZNB-1994-49b-1731 
 Volume    49 
80Author    RolfW. Saalfrank3 ', BerndH. Örner1, Stephan Recka, Jochen Nachtraba, Eva-Maria Petersb, Karl Petersb, Hans Georg Von SchneringbRequires cookie*
 Title    Synthese und Umsetzungen von 4-Acyl/Carbamoyl-N-aryl-3-chloro- pyrrol-2,5-dionen: Kristallstruktur eines auf Wasserstoffbrückenbindungen basierenden supramolekularen Bandes [1] Synthesis and Reactions of 4-Acyl/Carbamoyl-N-aryl-3-chloro-pyrrol-2,5-diones: Crystal Structure of a Supramolecular Ribbon Based on Hydrogen Bonds [ 1]  
  Reference    Z. Naturforsch. 51b, 1084—1098 (1996); eingegangen am 14. August 1995 
  Published    1996 
  Keywords    2, 3-Dioxo-2, 3-dihydrofurans, Pyrrol-2, 5-diones, Intermolecular H-Bridges, X-Ray 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1084.pdf 
 Identifier    ZNB-1996-51b-1084 
 Volume    51