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  • 1
    ISSN: 0044-2313
    Keywords: 1,3,2λ5-Diazaphosphetidin-4-ones ; 2-Arylseleno-2-chloro-1,2,3-triorgano Selenenamides ; 77Se-NMR ; X-ray structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese und Charakterisierung von 2-Arylseleno-2-chloro-1,2,3-triorgano-1,3,2λ5-diazaphosphetidin-4-onenDie Reaktion von N,N′-Dimethyl-N,N′-bis(trimethylsilyl)harnstoff 8 und N-Methyl-N′-phenyl-N,N′-bis(trimethylsilyl)harnstoff 9 mit Phenylselenenylchlorid 6 oder p-Chlorophenylselenenylchlorid 7 ergab die N-Arylseleno-N,N′-diorgano-N′-(trimethylsilyl)harnstoffe 10-13. Die Umsetzung von 10-13 mit MePCl2 und PhPCl2 führte zur Bildung einer neuen Verbindungsklasse, der 2-Arylseleno-2-chloro-1,2,3-triorgano-1,3,2λ5-diazaphosphetidin-4-one 14-19. Die neuen Selenophosphorane 20 and 21 wurden durch Umsetzung der Verbindungen 15 und 17 mit p-Nitrophenol in Anwesenheit von Triethylamin dargestellt. Identität und Struktur der neuen Verbindungen wurden durch 1H- und 13C-NMR-Spektroskopie und durch Elementaranalyse sowie durch 31P- und 77Se-NMR-Spektroskopie für 14-21 und durch Massenspektrometrie für 11 und 13 bewiesen. Ein möglicher Mechanismus der Bildung der Selenophosphorane wird diskutiert. Für die Verbindungen 19 und 20 wurden Einkristall-Röntgenstrukturanalysen durchgeführt. Beide Strukturen zeigen eine verzerrt trigonalbipyramidale Geometrie am Phosphor, wobei die größten Verzerrungen durch die viergliedrigen Ringe verursacht werden.
    Notes: The reactions of N,N′-dimethyl-N,N′-bis(trimethylsilyl)urea 8 and N-methyl-N′-phenyl-N,N′-bis(trimethylsilyl)urea 9 with phenylselenenyl chloride 6 and p-chlorophenylselenenyl chloride 7 furnished the N-arylseleno-N,N′-diorgano-N′-(trimethylsilyl)ureas 10-13. The reactions of 10-13 with MePCl2 and PhPCl2 resulted in the formation of a new class of compounds, the 2-arylseleno-2-chloro-1,2,3-triorgano-1,3,2λ5-diazaphosphetidin-4-ones 14-19. The new selenophosphoranes 20 and 21 were obtained in the reaction of 15 and 17 with p-nitrophenol in the presence of triethylamine. The identity and structure of the new compounds were established by 1H- and 13C-NMR spectroscopy, elemental analysis, 31P- and 77Se-NMR spectroscopy in the case of the selenophosphoranes 14-21, and mass spectrometry in the case of 11 and 13. A possible mechanism of the reaction leading to the selenophosphoranes is discussed. Single-crystal X-ray structure analyses of the selenophosphoranes 19 and 20 were conducted. Both display distorted trigonal bipyramidal geometry at phosphorus, the major distortions being imposed by the four-membered rings.
    Additional Material: 2 Ill.
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  • 2
    ISSN: 0009-2940
    Keywords: 1,3,5-Trimethylbiuret ; Ethylenediamine, N,N,N′-trimethyl- ; Iron complexes ; Chromium complexes ; Molybdenum complexes ; 1,3,5,2-Triazaphosphorinanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Compounds with the 1,3,5,2-Triazaphosphorinane Skeleton: Synthesis and Coordination Chemistry of Novel N,N,N′-Trimethylethylenediamine-Substituted Compounds with Three-and Four-Coordinate PhosphorusSubstitution of chlorine for the N,N,N′-trimethylethylenediamine group in the 1,3,5-trimethylbiuret derivative 2 produced 4. The reaction of the 1,3,5,2-triazaphosphorinane 4 with sulfur furnished the expected P(=S) derivative 5. Reaction of 4 with methyl iodide led to the formation of the ammonium iodide 6 by methylation of the nitrogen atom of the terminal NMe2 group while the phosphorus atom of 4 remained unaffected. The structure of 6 was confirmed by a single-crystal X-ray structure analysis. In the unusual reaction of 4 with Br2 the bromodimethylammonium-bromophosphonium dibromide 7 was formed. The reaction of 4 with Fe2(CO)9 furnished the expected Fe(CO)4 complex 8 while with (C7H8)Cr(CO)4 (C7H8=norbornadiene) 9 was obtained. In 9, norbornadiene is replaced by one molecule of 4, which is coordinated by phosphorus and the nitrogen atom of the NMe2 group. In the reaction of 4 with C7H8Mo(CO)4 (C7H8=norbornadiene) the complexes 10a and 10b were formed. In 10a, the P(III) atom of 4 is coordinated to Mo; the second coordination site at Mo(CO)4 is occupied by the nitrogen atom of the terminal NMe2 group. In 10b, the nitrogen atoms of the PN(Me) and of the NMe2 grouping are coordinated to Mo, with formation of a five-membered ring.
    Additional Material: 1 Tab.
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  • 3
    ISSN: 0009-2940
    Keywords: Ethylenediamine, N,N,N′-trimethyl- ; Transition-metal complexes, P - N coordination ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-{[2-(Dimethylamino)ethyl]methylamino}-1,3,2-benzodioxaphosphole as a Ligand in Transition-Metal Complexes. Crystal and Molecular Structure of a Tetracarbonyl Chromium DerivativeComplexes of the zerovalent transition metals chromium, molybdenum, iron, and platinum react with the title phosphorus-(III)-compound 3 to give a range of different products: in the coordination compounds 4 and 5, 3 functions as a bidentate ligand, coordinating to the metal through the phosphorus and the nitrogen atom of the dimethylamino group. The structure of 4 was confirmed by a single-crystal X-ray analysis, showing a ligand “bite” angle of 91.0, 91.4° in two independent molecules. In the compounds 7 - 9, involving Mo, Fe, and Pt as a central atom, 3 coordinates solely through P(III). For the platinum(O) complex 9 31P-NMR spectroscopy revealed a dynamic behaviour at room temperature.
    Additional Material: 1 Ill.
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