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  • Phosphanes  (1)
  • aluminium  (1)
  • 1995-1999  (2)
  • 1
    ISSN: 0009-2940
    Keywords: Phosphanes ; Phosphazanes ; Methyleneamine ; Imidazoles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Imidazole Derivatives, XVII. - Synthesis and Properties of Dichloro(1,3-dimethyl-2-imidazol-2-ylidenimino)phosphane - a Methylenamino Substituent with Uncommon Donor PropertiesDichloro(1,3-dimethyl-2-imidazol-2-ylidenimino)phosphane (5) is obtained from 1,3-dimethyl-2,3-dihydro-2-trimethylsilyliminoimidazole (4) and PCl3 in almost quantitative yield. Strong PN-π interaction (5B) is revealed by its X-ray structure analysis [P(1)-N(1) 1.579(2) Å]. AlCI3 causes chloride abstraction to give the cationic cyclophosphazane 8 identified by NMR spectroscopy.
    Additional Material: 1 Ill.
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  • 2
    ISSN: 0044-2313
    Keywords: Magnesium ; aluminium ; 2-iminoimidazoline complexes ; imidazole derivatives ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Imidazole Derivatives. XXIII. 2-Iminoimidazoline Derivatives of Magnesium and Aluminum1,3-dimethyl-2-iminoimidazoline (7, ImNH) forms with MgI2 the complex [(ImNH)4Mg]I2 (8). Whose X-ray structure analysis implies the presence of NHN bridges in the cation. With MeMgI and n-Bu2Mg the polymeric coordination compounds [(ImN)MgI]n (9) and [(ImN)2Mg]n (10) are formed. 7 and it's trimethylsilyl derivative 12 react with AlMe2Cl to give the ionic complexes [(ImNR)2AlMe2]Cl (11, 13, R = H, SiMe3) which are stable with respect to the formation of imidazol-2-imino complexes. The adduct ImNSiMe3 · AlCl3 (14) accessible from the reaction of 12 and AlCl3 eliminates chlorotrimethylsilane on heating to give the trimeric imino complex [(ImN)AlCl2]3 (15); the X-ray structure of 15 confirms the high π-donor properties of the imino substituent.
    Notes: 1,3-Dimethyl-2-iminoirnidazolin (7, ImNH) bildet mit MgI2 den Komplex [(ImNH)4Mg]I2 (8), dessen Kristallstrukturanalyse das Vorliegen von NHN-Brücken innerhalb des Kations glaubhaft macht. Mit MeMgI und n-Bu2Mg werden die Koordinationspolymeren [(ImN)Mgl]n (9) und [(ImN)2Mg]n (10) gebildet. 7 und dessen Trimethylsilyl-Derivat ImNSiMe3 (12) reagieren mit AlMe2Cl zu den ionischen Komplexen [(ImNR)2AlMe2]Cl (11, 13; R = H, SiMe3), die sich als thermisch stabil bezüglich der Bildung von Imidazol-2-imino-Komplexen erweisen. Das aus 12 und AlCl3 zugängliche Addukt ImNSiMe3 · AlCl3, (14) eliminiert bei thermischer Belastung Chlortrimethylsilan: die strukturanalytische Charakterisierung des trimeren Imino-Komplexes [(ImN)AlCl2]3 (15) belegt die hohe π-Donorkapazität des Imino-Substituenten.
    Additional Material: 2 Ill.
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