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81Author    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 
82Author    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 
83Author    N. Orbert, A. Uner, R. Einer Probst, Claus-Rüdiger Heikenwälder, E. Berhardt Herdtweck, Siegfried Gam, G.Erhard Müller3Requires cookie*
 Title    Beeinflussen interne N-Donorliganden Hydrolyse-und Kondensationsreaktionen von Chlorsilanen? D o Internal N-D onor Ligands Influence the Hydrolysis and Condensation Reactions of Chlorosilanes?  
 Abstract    The reaction of [C6H4CH2N(CH3)2]2SiCl2 (1) with hydrogen chloride gives the singly pro-tonated adduct 2. Its solid state structure has been determined by single crystal X-ray dif­ fraction. Centrosymmetric 2 is orthorhombic, space group Pbca, a = 1694.9(2), b = 1161.7(2), c = 2501.7(3) pm; Z -8. Controlled hydrolysis of 1 leads to the 1,3-siloxanediol 4, probably via the precursors 3 a -3 c which could not be isolated. The hydrogen chloride formed during the hydrolysis protonates two of the dimethylamino groups, while the other two dimethyl-amino functions form hydrogen bonds to the silanol groups. Centrosymmetric 4: monoclinic, space group P 2Jc, a = 980.3(1), b = 933.9(1), c = 2177.5(2) pm, ß = 99.94(1)°; Z = 4. If the hydrolysis is carried out in the presence of lithium naphthalenide, the metalated compound {[C6H4CH2N(CH3)2]2Si(OLi)OH}4-2LiCl-2CHCl3 (5) is obtained. The solid state structure of 5 exhibits two cube-like subunits which are held together by nitrogen and oxygen lithium contacts, hydrogen bonds between silanol groups and nitrogen atoms, and which are linked by the four silicon centres. Tetrameric 5: monoclinic, space group C2/C or Cc; a -1523.6(2), b -2440.2(1), c = 2534.8(2) pm, ß = 93.83(3)°; Z = 8. These results show that the intramolec­ ular donor capabilities of the dimethylaminobenzyl ligand at silicon can stabilize 1,3-süox-anediol and SiOLi substructures. Compounds like 1 serve as model compounds for the con­ trolled formation of precursors for silicone synthesis. 
  Reference    Z. Naturforsch. 48b, 1625—1634 (1993); eingegangen am 26. Juli 1993 
  Published    1993 
  Keywords    Amino-Functionalized Dichlorosilanes, Control of Hydrolysis Reactions, 1, 3-Siloxanediol, Lithium Cluster, Structure 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1625.pdf 
 Identifier    ZNB-1993-48b-1625 
 Volume    48 
84Author    HansG. Ünter Aurich, Abdellatif ChairRequires cookie*
 Title    .3-DipoIare Cycloaddition von Dinitronen - Bildung tricyclischer Dimerer 1 .3 -Dipolar Cycloaddition of Dinitrones -Formation of Tricyclic Dimers  
 Abstract    Various dialdehydes (1 -5) were formed by addition of dithiols to acrolein. Reaction of these dialdehydes with N-alkylhydroxylamines afforded dinitrones the two nitrone groups of which were joined by an alkylidene chain containing two sulfur atoms (6 a ,b -1 0 a ,b). Cycloaddition of these dinitrones with dimethyl acetylenedicarboxylate proceeded in the usual way giving bis(4-isoxazolines) (lla -1 5 a) . 
  Reference    Z. Naturforsch. 49b, 963—9 (1994); eingegangen am 16. März 1994 
  Published    1994 
  Keywords    Dialdehydes, Dinitrones, 1, 3-Dipolar Cycloaddition, Tricyclic Compounds, Metal C om plexes 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0963.pdf 
 Identifier    ZNB-1994-49b-0963 
 Volume    49 
85Author    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 
86Author    AndreasF. Stange, Eberhard Waldhör, Michael Moscherosch, Wolfgang KaimRequires cookie*
 Title    Variable Structure of the Cu2S2 Core in Doubly Thiolate-Bridged Dicopper(I) Complexes. An X-Ray Crystallographic, Electrochemical and EPR Study of (dmp)2 (o-CH3 C6H4S)2Cu2 , dmp = 2,9-Dimethyl-l,10-phenanthroline, and a Comment on the Nature of Phenanthroline-Containing "Cu(0)" Complexes  
 Abstract    The molecular and crystal structure of the dicopper(I) complex (dm p)2(M-o-CH3C6H4S)2Cu2 (1), dmp = 2,9-dim ethyl-l,10-phenanthroline, has been deter­ mined. With Cu/S/Cu and S/Cu/S bond angles between 80 and 100°, the planar structure of the central CuSCuS four-membered ring is much more symmetric for 1 as compared to the analogous complex 2 of unsubstituted 1,10-phenanthroline which has a folded Cu2S2 core with bond angles between 67 and 108°. This result illustrates a considerable structural flexi­ bility of the LCu(m-SR)2CuL entity which is being discussed as a possible model for CuA centers of cytochrome c oxidase or nitrous oxide reductase. Oxidation of both com plexes 1 and 2 remains irreversible even at cyclovoltammetric scan rates o f 1 V/s. However, the methyl substitution in complex 1 causes increased reversibility of the electronically coupled dmp-based reduction processes. Accordingly, the EPR spectrum of l -* is characterized by hyper-fine splitting from dmp--and a relatively small 63 " Cu coupling of 0.53 mT. The stabilization of 2,9-disubstituted 1,10-phenanthroline radical anions by coordination to Cu(I) is also dem ­ onstrated by detection of a single broad EPR line at g 2.0028 for the formal "C u(0)" complex Cu(dpp)2 = CuI(dpp_-)(dpp), dpp = 2,9-diphenyl-l,10-phenanthroline. While the EPR signal of Cu(dpp)2 loses intensity on cooling, possibly due to dimerization and spin-pairing, the distorted tetrahedral configuration with essential orthogonal arrangement of dpp jz systems seem s to disfavour an intramolecular electron hopping. 
  Reference    (Z. Naturforsch. 50b, 115—122 [1995]; received July 25 1994) 
  Published    1995 
  Keywords    Crystal Structure, Copper Complexes, Sulfur Ligands, 1, 10-Phenanthrolines, EPR Spectra 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0115.pdf 
 Identifier    ZNB-1995-50b-0115 
 Volume    50 
87Author    RajK. Bansal, Neelam Gandhi, A. Schmidpeter, K. KaraghiosoffRequires cookie*
 Title    Synthesis of [l,2,4,3]Triazaphospholo[l,5-a]pyridines+  
 Abstract    Condensation o f 1,2-diaminopyridinium iodides with tris(dimethylamino)phosphine gives [l,2,4,3]triazaphospholo[l,5-a]pyridines 2a-d. Diethylamine adds to the N=P bond o f 2a, b only if the phosphorus is oxidized at the same time. Hydrolysis of 2 a opens the triazaphos-phole ring at its 2,3-bond. 
  Reference    Z. Naturforsch. 50b, 558 (1995); received October 21 1994 
  Published    1995 
  Keywords    l, 3-Diaza-2-phosphaindolizines, NM R Spectra, Mass Spectral Fragmentation, Hydrolysis, 1, 2-Addition Reactions 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0558.pdf 
 Identifier    ZNB-1995-50b-0558 
 Volume    50 
88Author    Hans Bock, Sabine Nick, Christian Näther, Wolfgang BenschRequires cookie*
 Title    Wechselwirkungen in Kristallen, 63 [1, 2]  
 Abstract    Kristallisation und Strukturbestimmung von 1,2-Dimesitoylbenzol und von Bis(hydrogen-l,2-dimesitoylbenzol)-dinatrium-bis(ethylendiamin) Interactions in Crystals, 63 [1, 2] Crystallization and Structure Determ ination of 1,2-Dimesitoylbenzene and of Bis(hydrogen-l,2-dimesitoylbenzene)-disodium-bis(ethylendiamine) 
  Reference    Z. Naturforsch. 50b, 605 (1995); eingegangen am 18. August 1994 
  Published    1995 
  Keywords    1, 2-Dimesitoylbenzene, Radical A nion Sodium Salt, Single Crystal Structures, M N D O Calculations 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0605.pdf 
 Identifier    ZNB-1995-50b-0605 
 Volume    50 
89Author    Z. NaturforschRequires cookie*
 Title    Synthese und Charakterisierung von 1,3,5-Hexahydrotriazin-Komplexen des Mo° und Movl  
 Abstract    Organo-substituted 1,3,5-hexahydrotriazine com plexes of the type (R N C H 2)3M o(C O)3 (R = CFI3, / -C 3 H 7 and CH2C6H 5) are obtained by ligand displacement from 7 6-C7H 8M o(C O)3 in high yields. These products have been characterized by 'H. 13C, 95Mo NM R, IR as well as mass spectroscopy and contain an electron-rich M o(C O)3 center bonded to the 1,3,5-hexahydrotriazine 6 e donor via three M o -N bonds. Oxidation o f the Mo° com ­ plex l,3,5-(C H 3N CH 2)3M o(C O)3 with H20 2 under carefully controlled conditions allows iso­ lation of 1,3,5-(CH3N C H 2) 3M o 0 3 containing a M ovl center. Chemical and spectroscopic properties o f these com plexes are compared with those o f related Mo com plexes with neutral macrocyclic ligands containing N 3 donor sets. 
  Reference    Z. Naturforsch. 50b, 1038—1044 (1995); eingegangen am 30. Dezem ber 1994 
  Published    1995 
  Keywords    1, 3, 5-Hexahydrotriazines, Carbonyl Complexes, O xo Complexes, R edox Chemistry, Multinuclear NM R Spectra 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1038.pdf 
 Identifier    ZNB-1995-50b-1038 
 Volume    50 
90Author    G. Erhard, H. Enesa, A. Nton Rieker, M. Arkus, N. Eum Ayerb, W. Olfgang HillerRequires cookie*
 Title    ,4-Addition of Lithium Organyls to /?ara-Quinols / Structure Determination of 2,6-Di-te/t-butyl-4-hydroxy-4,5-diphenyIcyclohex-2-en-l-one  
 Abstract    Addition of lithium organyls to sterically hindered para-quinols leads to 1,2-or 1,4-adducts. The 1,4-addition prevails, if the 4-substituents in the quinol and the organic group in the lithium organyl are large. Four 1,4-addition products (2-cyclohex-2-en-l-ones) are synthesized and their structures investigated by NMR spectroscopy. The aryl groups at C-4 and C-5 acquire equatorial positions, the alkyl group at C-6 is bisectional. These results are confirmed by X-ray analysis of 2,6-di-terr-butyl-4-hydroxy-4,5-diphenylcyclohex-2-en-1 -one, revealing a twist boat conformation of the cyclohexene ring. 
  Reference    Z. Naturforsch. 51b, 381—387 (1996); received August 11 1995 
  Published    1996 
  Keywords    Crystal Structure, Quinol, 1, 4-Addition, Lithium Organyl, Cyclohex-2-en-l-ones 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0381.pdf 
 Identifier    ZNB-1996-51b-0381 
 Volume    51 
91Author    H. Möhrle, U. Von Der Lieck-WaldheimRequires cookie*
 Title    Vinamidinium-Salze als Nucleophile Vinamidinium Salts as N ucleophiles  
 Abstract    1,4-diazepinium salts could not be aminomethylated with conventional methods, but the hydrochlorides produced with methyleniminium salts the C-Mannich-compounds. The reactivity of the substrate was mainly controlled by electronic effects of the substituents. Aminomethylation of 1,5-diazapentadienium salts occurred only if the conformations caused no steric hindrance of the ß-C-atom. Methyl substituted 2,3-dihydro-1,4-diazepinium salts reacted with 1,3,5 triazine to pyrimidine anellated derivatives. 
  Reference    Z. Naturforsch. 51b, 421—430 (1996); eingegangen am 4. Juli 1995 
  Published    1996 
  Keywords    Mannich Reaction, Iminium Salts, 1, 3, 5 Triazine, Push-Pull-Systems 2, 3-Dihydro- 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0421.pdf 
 Identifier    ZNB-1996-51b-0421 
 Volume    51 
92Author    P.Requires cookie*
 Title    Phosphonio-substituierte 1,3-Diphosphanaph thaline aus der a,o-Kondensation von Phosphonium-benzyliden  
 Abstract    h o sp h o n io -S u b stitu te d 1 .3 -D ip h o sp h a n ap h th a le n es from th e a,o -C o n d e n sa tio n o f P h o sp h o n iu m -b en z y lid e s G eo rg Jo ch em , A lfred S chm idpeter* 
  Reference    Z. Naturforsch. 51b, 773—777 (1996); eingegangen am 21. Dezember 1995 
  Published    1996 
  Keywords    Phosphonium Ylides, Electrophilic Aromatic Substitution, 1, 3-Benzodiphosphinines, Spontaneous Chlorophosphine Dissociation, Selective Oxidation by Elemental Sulfur 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0773.pdf 
 Identifier    ZNB-1996-51b-0773 
 Volume    51 
93Author    B. Ernd, W. Rackm Eyer, D. Örfler, W. Olfgang Milius, M. Ax, H. ErberholdRequires cookie*
 Title    ,1-Organoboration of Trimethyl-l-propynyltin Using Diorganoboryl-Substituted Ferrocenes  
 Abstract    The reactions of various diorganoborylferrocenes, F c -B R 2 [1, R = Me (a), Et (b), 'Pr (c), 'Bu (d), Ph (f), R2B = 9-borabicyclo[3.3.1]nonyl (e)] and 1,1 '-bis(9-borabicyclo[3.3.1]nonyl)-ferrocene (2) with trimethyl-l-propynyltin (3) were studied, and the products of the 1,1-organoboration were characterized as the alkenyltin compounds 4 -6 by 'H, UB, 13C and 119Sn NMR. In the cases of l a -I d and If, there is competition between the transfer of a ferrocenyl group and the other organyl groups R from boron to carbon, whereas in the case of the 9-borabicyclo[3.3.1]nonane derivatives le and 2, the enlargement of the bicyclic system takes place selectively (compounds 4e and 6). The molecular structure of the product 6, obtained from the reaction between the l,l'-diborylated ferrocene 2 and two equivalents of 3, was determined by single crystal X-ray analysis (space group P2x!c\ monoclinic; Z = 4, a = 958.3(2), b = 1610.4(3), c = 2405.3(5) pm and ß = 90.33(3)°). 
  Reference    Z. Naturforsch. 51b, 851 (1996); received October 26. 1995 
  Published    1996 
  Keywords    Ferrocenes, Trimethyl-l-propynyltin, 1, 1-Organoboration, Alkenyltin Compounds, X-Ray 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0851.pdf 
 Identifier    ZNB-1996-51b-0851 
 Volume    51 
94Author    Hans-Peter Schrödel, Alfred SchmidpeterRequires cookie*
 Title    Phosphorandiyl-l,3,5-triphosphinane/ Phosphonio-l,3,5-triphosphinin Kationen Phosphoranediyl-l,3,5-triphosphinanes / Phosphonio-l,3,5-triphosphinine Cations  
 Abstract    Depending on the reaction conditions, the condensation of triphenylphosphonium bis(trimethylsilyl)methylide 1 with phosphorus trichloride and phosphorus tribromide gives the cyclic trimers (Ph3P=CP-X)3, X = Cl, Br, trihalo-tris(triphenylphosphoranediyl)-1,3,5-triphosphinanes 3 and 5. In solution the compounds dissociate to give the ionic forms 4 and 6 which rapidly exchange the halide between the halophosphine and the phosphenium moieties. The exchange is slowed down when the halide ion is replaced by a tosylate ion. Substitution of the covalent chloride of 4 for diphenylphosphino groups gives again an ionic product 10, while the introduction of a morpholino group as well as the replacement of all chloride by triflate give dicationic compounds 12 and 13. Reaction of 3 with gallium trichloride finally leads to the tris(triphenylphosphonio)-l,3,5-triphosphinine trication as a major equilibrium participant. 
  Reference    Z. Naturforsch. 52b, 162—168 (1997); eingegangen am 24. Oktober 1996 
  Published    1997 
  Keywords    Phosphonium Ylides, Halophosphines, Phosphenium Ions, 1, 3, 5-Triphosphinines, Halide Exchange 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0162.pdf 
 Identifier    ZNB-1997-52b-0162 
 Volume    52 
95Author    Lothar BeyerRequires cookie*
 Title    Substituierte l,2,4-Thiadiazolium-dichloroaurate(I) und -tetra- chloroaurate(III) als Reaktionsprodukte von N-Thiocarbamoyl- benzamidinen mit TetrachIorogold(III)-Verbindungen  
 Abstract    Substituted 1,2,4-T hiadiazolium dichloroaurates(I) and -tetrachloroaurates(III) as Products o f the R eaction o f N -T hiocarbam oyl-benzam idines w ith Tetrachlorogold(III) Com pounds U w e Schröder3, R ainer R ichter3, Jürgen H artung3, U lrich A bram b, 
  Reference    Z. Naturforsch. 52b, 620—628 (1997); eingegangen am 12. März 1997 
  Published    1997 
  Keywords    1, 2, 4-Thiadiazoliumchloroaurates(I/III), Synthesis, X-Ray, EM Spectra, N-Thiocarbamoylbenzamidines 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0620.pdf 
 Identifier    ZNB-1997-52b-0620 
 Volume    52 
96Author    Z. NaturforschRequires cookie*
 Title      
  Reference    Z. Naturforsch. 52b, 1544—1548 (1997) 
  Published    1997 
  Keywords    -Diphenyl l-Cyclohexyl-l-(4-nitroanilino)m ethanephosphonate, 1, 1-Diaryl-Substituted Dimers Crystal Structure, FAB-Mass Spectra 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1544.pdf 
 Identifier    ZNB-1997-52b-1544 
 Volume    52 
97Author    Markus Wollenweber2, Reinhart Keese3, Helen Stoeckli-EvansbRequires cookie*
 Title    Synthesis of Spirocyclic Aminosilanes with Electron Withdrawing Substituents at Nitrogen  
 Abstract    The first synthesis of spirocyclic tetrasulfonamidosilanes is described. According to the X-Ray structure analysis of the most stable tetratosylamidosilane obtained the Silicon is bonded to four Nitrogen atoms in a spirocycle and surrounded by four Oxygen atoms which are located above the planes of the SiN4 tetrahedron. 
  Reference    Z. Naturforsch. 53b, 145—148 (1998); received October 24 1997 
  Published    1998 
  Keywords    Spirocyclic Sulfonamidosilanes, 1, 2-Phenylene Diamides, Capped Tetrahedron, X-Ray Data, Chelation 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0145.pdf 
 Identifier    ZNB-1998-53b-0145 
 Volume    53 
98Author    Markus Leirer, Günther Knör, Amd VoglerRequires cookie*
 Title    Synthesis and Spectroscopic Properties of 1,2-Diiminetricarbonyl- rhenium(I)chloride Complexes with Aliphatic Diimines (or 1,4-Diaza-l,3-butadienes) as Ligands  
 Abstract    Re(l,2-diimine)(CO)3Cl complexes with the aliphatic bidentate ligands diiminosuccino-dinitrile (DISN), benzilbisanile (BEAN), bisacetylbisanile (BABA), and benzildiimine (BE­ DIM) are reported. The compounds show Re(I) to 7r*(diimine) metal-to-ligand charge transfer (MLCT) absorptions in the visible spectral region. The energy of these MLCT-transitions de­ creases in the series BABA > BEDIM > BEAN > DISN, depending on the 7r* acceptor properties of the coordinated diimine ligands. The maxima of these CT bands undergo a solvent-dependent shift (negative solvatochromism), which indicates a partial charge redistribution in the excited state. The compounds are not photoluminescent at room temperature and 77 K. 
  Reference    Z. Naturforsch. 54b, 341—344 (1999); received December 11 1998 
  Published    1999 
  Keywords    Charge Transfer, Rhenium Complexes, 1, 4-Diaza-l, 3-butadienes, Solvatochromism 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0341.pdf 
 Identifier    ZNB-1999-54b-0341 
 Volume    54 
99Author    Bernhard Schreiner, Reinhold Urban, Anastassios Zografidis, Karlheinz Sünkel, Kurt Polborn, Wolfgang Beck, *. Sonderdruckanforderungen, ProfW. Beck, Herrn Professor, LawrenceF. DahlRequires cookie*
 Title    Metallkomplexe mit biologisch wichtigen Liganden, CXXI [1]. Orthopalladierte Enolate aus N-(Diphenylmethylen)-Schiff-Basen von a-Aminosäureestern als ambivalente 1,3-Dipole in [2+3]-Cyclo- additionsreaktionen. Strukturen einer Reihe von Cycloaddukten Metal Complexes of Biologically Important Ligands, CXXI [1]. Orthopalladated Enolates from N-(Diphenylmethylene) Schiff Bases of a-Amino Acid Esters as Ambivalent 1,3-Dipoles in [2+3] Cycloadditions. Structures of a Series of Cycloadducts  
 Abstract    Enolates of ortho-palladated N-(diphenylmethylene) Schiff bases from glycine esters (R3P)Pd[(C6H4)(C6H5)C=N-C(R')=C0 2R] were isolated and have been shown to be ambiva­ lent 1,3-dipoles in [2+3] cycloadditions. Tetracyanoethene, dimethyl acetylene dicarboxylate, dimethyl azodicarboxylate, thiobenzophenone, thione-S, 4-phenyl-l,2,4-triazoline-3,5-dione, diphenyl-ketene and phenylisocyanate are added at the palladium and the enolate (a-C) carbon atoms, whereas methyl propiolate, methyl acrylate, and the methyl esters of maleic and fumaric acid form [2+3] cycloadducts with the «-carbon and the imino carbon atoms of the enolates un­ der mild conditions. The structures of seven cycloadducts were determined by X-ray diffraction analyses. 
  Reference    Z. Naturforsch. 54b, 970—988 (1999); eingegangen am 3. Mai 1999 
  Published    1999 
  Keywords    N-(Diphenylmethylene)glycinate, Enolates, 1, 3-Dipoles, [2+3] Cycloaddition, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0970.pdf 
 Identifier    ZNB-1999-54b-0970 
 Volume    54 
100Author    Klaus Burger, Herbert Goth, Kurt Einhellig, Alfred GierenRequires cookie*
 Title    Zum Thermolyseverhalten von 2.2-Dihydro-1.4.2-oxazaphosphol-4-enen, I Über die Dimerisierung von bis(trifluormethyl)substituierten Nitril-yliden [1, 2] Thermolysis of 2,2-Dihydro-l,4,2-oxazaphosphol-4-enes, I Dimerization of Bis(trifluoromethyl) Substituted Nitrile Ylides [1, 2]  
  Reference    Z. Naturforsch. 36b, 345—352 (1981); eingegangen am 18. November 1980 
  Published    1981 
  Keywords    I, 4, 2-Oxazaphosphoranes, 5->-[3 + 2]Cycloreversion Reactions, 1, 3-Dipole Dimerization, Head to Head Dimerization 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0345.pdf 
 Identifier    ZNB-1981-36b-0345 
 Volume    36 
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