| | 1 | Author
| SanaaM. Eldin | Requires cookie* | | | Title
| Reactions of Cyanothioacetamide Derivatives with 2-Hydrazinothiazol-4(5//)-one: Synthesis, Cyclization and Biological Evaluation of Several New Annelated Pyran, Thiazole, 1,2,4-Triazole and 1,2,4-Triazine Derivatives  | | | | Abstract
| The thiocarboxamidocinnamonitriles (2) reacted with 2-hydrazinothiazol-4(5//)-one (3) to afford the corresponding pyrano[2,3-d]thiazoles (6). Compounds 6 were used for the synthe sis of several new annelated pyran, thiazole, 1,2,4-triazole and 1,2,4-triazine derivatives via their reactions with chloroacetic acid, ethyl chloroformate, diethyl oxalate and acetylacetone. Structures were established based on elemental and spectral data studies. Some of the newly synthesized heterocyclic derivatives were tested for their antimicrobial activity. | | | |
Reference
| Z. Naturforsch. 54b, 1589—1597 (1999); received July 2 1999 | | | |
Published
| 1999 | | | |
Keywords
| Thiocaboxamidocinnamonitriles, Pyrans, Thiazoles, 1, 2, 4-Triazoles, 1, 2, 4-Triazines | | | |
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| default:Reihe_B/54/ZNB-1999-54b-1589.pdf | | | | Identifier
| ZNB-1999-54b-1589 | | | | Volume
| 54 | |
| 2 | Author
| U. D. Rutkow Ski, P. Strauch | Requires cookie* | | | Title
| Oxidative S-S-Kopplung von 1,2-Dithiooxalat durch intramolekulare Redoxreaktion der Selen(II)-und Tellur(II)-Komplexe O xidative S-S C oupling o f 1,2-D ithiooxalate by Intramolecular R edox Reaction o f the Selenium (II) and Tellurium (II) C om plexes | | | | Abstract
| The reaction of sodium monochalcogenopentathionates, Na2[Y(S20 3)2] (Y = Se, Te) with potassiumdithiooxalate in a water/methanol solution in presence of large cations (e. g. Ph4P+, Ph4As+ or BzlPh3P+) yields complexes of the type [Y(dto)2]2~ (Y = Se, Te). These complexes are of limited stability and undergo a redox reaction in solution. As the main product of this redox process the 3,4-dithiahexane-2,5-dione-l,6-di(thiocarboxylate) was isolated and characterized by X-ray structure analysis as the benzyltriphenylphosphonium salt (monoclinic space group P2^/c, Z = 2, a = 8.899(5) A, b = 16.458(2) Ä, c = 16.034(6) A and ß = 98.02(2)°). With Te_+ (Y = Te) as the coordination center we have been able to isolate the intermediate complex (Ph4P)2[Te(dto)2], | | | |
Reference
| (Z. Naturforsch. 54b, 73—76 [1999]; eingegangen am 13. August 1998) | | | |
Published
| 1999 | | | |
Keywords
| 1, 2-Dithiooxalate, X-Ray Data, Disulfide | | | |
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| default:Reihe_B/54/ZNB-1999-54b-0073.pdf | | | | Identifier
| ZNB-1999-54b-0073 | | | | Volume
| 54 | |
| 3 | Author
| Kristallstruktur Neuer, Kai Landskron, Wolfgang Schnick | Requires cookie* | | | Title
| Synthese und | | | | Abstract
| -diphosphazenium bromide [(NH->)3PNP(NHi)3]Br, nitrate 1(NH2)3PNP(NH2)3][N03], and toluene-4-sulfonate [(NH2)3PNP(NH2)3][CH3C6H4S0 3] have been prepared by anion exchange in aqueous solution. Single crystals were obtained from acetonitrile solutions in a temperature gradient between 60 °C and room temperature. The crystal structures were determined by single crystal X-ray methods at room temperature. ([(NH2)3PNP(NH2)3]Br: P i, Z = 2, a = 596.2(1),b = 744.5(1), c = 1114.4(1) pm, a = 108.78(1), ß = 104.18(1), 7 = 90.64(1)°, R 1 = 0.048, wR2 = 0.104; [(NH2)3PNP(NH2)3][N03]: Pi, Z = 2, a = 550.9(1), b = 796.3(1), c = 1115.7(1) pm, a = 94.45(1), ß = 99.55(1), 7 = 101,53(1)°, R l = 0.033, wR2 = 0.095; [(NH2)3PNP(NH2)3][CH3C6H4S 0 3]: P2,/c, Z = 4, a = 804.1(1), b = 596.1(1), c = 3218.7(3) pm, ß = 94.59(1)°, /?1 = 0.052, wR2 = 0.136). In the solid the three salts consist of discrete [(NHi)3PNP(NH2)3]+ cations and their corresponding anions. The PN4 tetrahedra in [(NH2)3PNP(NH2j3]Br are staggered, while in [(NH2)3PNP(NH2)3][N03] the eclipsed conformation is preferred. The PN4 tetrahedra of [(NH2)3PNP(NH2)3][CH3C 6H4S 0 3] show gauche conformation. | | | |
Reference
| Z. Naturforsch. 54b, 1363—1370 (1999); eingegangen am 13. Juli 1999 | | | |
Published
| 1999 | | | |
Keywords
| 3, 3, 3-Hexaamino-lA5, 3A5-diphosphazenium-Salze Synthesis and Crystal Structure of Novel l, l, l, 3, 3, 3-Hexaamino-lA5, 3A5-diphosphazenium Salts Phosphazenes, Ion Exchange, Crystal Structure 1, 1, 1, 3, 3, 3-Hexaamino-lA\3A5 | | | |
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| default:Reihe_B/54/ZNB-1999-54b-1363.pdf | | | | Identifier
| ZNB-1999-54b-1363 | | | | Volume
| 54 | |
| 4 | Author
| Markus Leirer, Günther Knör, Amd Vogler | Requires 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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| default:Reihe_B/54/ZNB-1999-54b-0341.pdf | | | | Identifier
| ZNB-1999-54b-0341 | | | | Volume
| 54 | |
| 5 | Author
| Bernhard Schreiner, Reinhold Urban, Anastassios Zografidis, Karlheinz Sünkel, Kurt Polborn, Wolfgang Beck, *. Sonderdruckanforderungen, ProfW. Beck, Herrn Professor, LawrenceF. Dahl | Requires 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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| default:Reihe_B/54/ZNB-1999-54b-0970.pdf | | | | Identifier
| ZNB-1999-54b-0970 | | | | Volume
| 54 | |
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