| | 1 | Author
| Thomas Dezember, Helmut Sitzmann | Requires cookie* | | | Title
| Die Fulven-Route zum Pentaisopropylcyclopentadienid The Fulvene Route to Pentaisopropylcyclopentadienide  | | | |
Reference
| Z. Naturforsch. 52b, 911—918 (1997); eingegangen am 21. April 1997 | | | |
Published
| 1997 | | | |
Keywords
| 1, 2, 3, 4-Tetraisopropyl-6-dimethylamino-pentafulvene, 1, 2, 3, 4-Tetraisopropyl-6-methyl-pen-tafulvene, 1, 2, 3, 4-Tetraisopropylpentafulvene, Lithium Pentaisopropylcyclopentadienide, Ful vene Complexes | | | |
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| default:Reihe_B/52/ZNB-1997-52b-0911.pdf | | | | Identifier
| ZNB-1997-52b-0911 | | | | Volume
| 52 | |
| 2 | Author
| G. Unther Seitz, Johanna Siegl | Requires cookie* | | | Title
| Synthese neuer Pyridin-C-nukleoside der 2 ,3 -D i d e s o x y r i b o s e durch "inverse" [4+2]-Cycloaddition Synthesis of Novel Pyridine-C-nucleosides of 2,3-Dideoxyribose by "Inverse" [4+2]-Cycloaddition | | | | Abstract
| The anomeric imido esters 5 and 6, appropriate precursors for C-nucleoside synthesis, were prepared and utilized as heterodienophiles in a Diels-Alder reaction with inverse electron | | | |
Reference
| Z. Naturforsch. 52b, 851—858 (1997); eingegangen am 22. April 1997 | | | |
Published
| 1997 | | | |
Keywords
| Pyridine-C-nucleosides, "Inverse" [4+2] Cycloadditions, 1, 2, 4-Triazine-C-nucleosides, 2, 3'-Dideoxy-/?-D-ribofuranosyl-pyridines | | | |
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| | | | | TEI-XML for
| default:Reihe_B/52/ZNB-1997-52b-0851.pdf | | | | Identifier
| ZNB-1997-52b-0851 | | | | Volume
| 52 | |
| 3 | Author
| Tristram Chivers, Masood Parvez, Peter Zoricak | Requires cookie* | | | Title
| Preparation and X-Ray Structure of 4-BrC6H4CNSC(Cl)N | | | | Abstract
| The title compound was obtained in 82% yield by the intramolecular cyclization of 4-BrC6H4C(NSCCl3)[N(SiMe3)2] in CH2CI2 at 23°C. It crystallizes in the triclinic system, space group PI, a = 7.957(3) Ä, b = 10.864(5) A, c = 5.625(1) A, a = 95.94(3)°, ß = 97.79(2)°, 7 = 100.72(3)°, V = 469.2(3) A3, and Z -2. The bond lengths of the planar C2N2S ring indicate partial 7r-delocalization. | | | |
Reference
| Z. Naturforsch. 52b, 557—559 (1997); received September 5 1996 | | | |
Published
| 1997 | | | |
Keywords
| Crystal Structure, 1, 2, 4-Thiadiazole, Intramolecular Cyclization | | | |
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| default:Reihe_B/52/ZNB-1997-52b-0557.pdf | | | | Identifier
| ZNB-1997-52b-0557 | | | | Volume
| 52 | |
| 4 | Author
| Clemens Krempner1, Rhett Kempeb, Hartmut Oehme3 | Requires cookie* | | | Title
| The Thermal Isomerization of a Tetrahydro-2,3-disilanaphthalene into a 1,2-Disilacyclobutane -The Conversion of a Formal Silene [2+4] Cyclodimer into the [2+2] Cycloadduct | | | | Abstract
| 1,2,3,8a-Tetrahydro-1 -mesityl-5,7,8a-trimethyl-2,2,3,3-tetrakis(trimethylsilyl)-2,3-disila-naphthalene (3), the formal [2+4] cyclodimer of the transient 2-mesityl-l,l-bis(trimethylsilyl)-silene (2), on thermal treatment gradually isomerizes to give a mixture of the [2+2] products (E)-and -predominantly -(Z)-3,4-dimesityl-1,1,2,2-tetrakis(trimethylsilyl)-l,2-disilacyclo-butane [(E/Z)-4], By prolonged heating or at higher temperatures both (E/Z)-3 and (Z)-4 are converted into (E)-4, the thermodynamically most stable head-to-head dimer of 2. Possible pathways of the isomerization processes are discussed. | | | |
Reference
| Z. Naturforsch. 52b, 815—818 (1997); received February 14 1997 | | | |
Published
| 1997 | | | |
Keywords
| Silenes, Silene Dimerization, 2, 3-Disilanaphthalene Tetrahydro, 1, 2-Disilacyclobutane | | | |
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| default:Reihe_B/52/ZNB-1997-52b-0815.pdf | | | | Identifier
| ZNB-1997-52b-0815 | | | | Volume
| 52 | |
| 5 | Author
| Z. Naturforsch | Requires cookie* | | | Title
| Acyclo C-Nucleosides Analogues of Condensed 1,2,4-Triazines | | | | Abstract
| 1-Acyclo C-nucleosides of 7-methyl-10//-l,2,4-triazolo[3,,4':3,4][l,2,4]triazino[5,6-£>]indoles (9) have been prepared by cyclodehydrogenation of the sugar derivatives of 3-hydrazino-8-methyl-5//-l,2,4-triazino[5,6-6]indole (1). The respective linear isomer as 4 has been pre pared by a dehydrative cyclization of the amides of 1. Acetylation of the sugar hydrazones and their cyclized products gave the per-7V,0-acetyl derivatives. The molecular connectivity of the products was established by *H, 13C, and 2D H ,H Cosy spectra. | | | |
Reference
| Z. Naturforsch. 52b, 873—882 (1997); received February 17 1997 | | | |
Published
| 1997 | | | |
Keywords
| Acyclo C-Nucleoside, 1, 2, 4-Triazine, Indole, Triazinoindole, Triazolotriazinoindole | | | |
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| default:Reihe_B/52/ZNB-1997-52b-0873.pdf | | | | Identifier
| ZNB-1997-52b-0873 | | | | Volume
| 52 | |
| 6 | Author
| Lothar Beyer | Requires 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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| default:Reihe_B/52/ZNB-1997-52b-0620.pdf | | | | Identifier
| ZNB-1997-52b-0620 | | | | Volume
| 52 | |
| 7 | Author
| Christine Kamperdick3, Günter Adam3, NguyenHong Vanb, TranVan Sungb | Requires cookie* | | | Title
| Chemical Constituents of Madhuca pasquiery | | | | Abstract
| Four triterpenoids, the scarce nortriterpenoid platanic acid, two flavonoids and 2,4-dihy-droxy phenylacetic acid methyl ester, hitherto unknown as a natural product, were isolated from Madhuca pasquiery. The structures were established by means of mass and NMR spectroscopy. | | | |
Reference
| Z. Naturforsch. 52c, 295 (1997); received D ecem ber 12 1996/February 12 1997 | | | |
Published
| 1997 | | | |
Keywords
| Madhuca pasquiery, 2, 4-Dihydroxy Phenylacetic Acid Methyl E ster, Platanic Acid, Triterpenoids, Flavonoids | | | |
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| | | | | TEI-XML for
| default:Reihe_C/52/ZNC-1997-52c-0295.pdf | | | | Identifier
| ZNC-1997-52c-0295 | | | | Volume
| 52 | |
| 8 | Author
| T. Koch, W. Preetz | Requires cookie* | | | Title
| Darstellung, n B-, 13C -,1 H-NMR-und Schwingungsspektren | | | | Abstract
| von 2,2' -Bipyridylundecahydro-c/oso-dodecaborat(1-) sowie Kristallstruktur von (Ph4As)[(2,2-C10H8N2)B12Hn ] CH3CN Synthesis, n B, 13C, 'H NMR and Vibrational Spectra of 2 ,2 '-Bipyridyl-undecahydro-c/o5o-dodecaborate(l-) and Crystal Structure of (Ph4As)[(2 ,2 '-C10H8N2)B 12H 1 1 ]-CH3CN | | | |
Reference
| Z. Naturforsch. 52b, 1165—1168 (1997); eingegangen am 17. Juli 1997 | | | |
Published
| 1997 | | | |
Keywords
| 2, 2'-Bipyridyl-undecahydro-c/oso-dodecaborate(l-), Crystal Structure, n B NMR Spectra, 1H NMR Spectra, 13C NMR Spectra, Vibrational Spectra | | | |
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| default:Reihe_B/52/ZNB-1997-52b-1165.pdf | | | | Identifier
| ZNB-1997-52b-1165 | | | | Volume
| 52 | |
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