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  • Organic Chemistry  (3)
  • crystal structure  (3)
  • 1,1′-Diazaferrocene coordination  (1)
  • 2-Telluroimidazolines  (1)
  • Azaferrocene, tetramethyl-  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Heterocyclen als Liganden, VI: Die verbrückende Koordination eines 1,1′-Diazaferrocens in einem zweikernigen Silberkomplex  -  eine ungewöhnliche Struktur (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2275-2277 
    Details
    ISSN: 0009-2940
    Keywords: 1,1′-Diazaferrocene coordination ; Silver complex ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heterocycles as Ligands, VI1. - The Bridging Coordination of a 1,1′-Diazaferrocene in a Dinuclear Silver Complex - an Uncommon Structure[Ag2(μ-pyr2*Fe)2](BF4)2 · 2 MeOH (4, pyr* = C4Me4N) is obtained by reaction of pyr2*Fe · 2 Hpyr* (3) with AgBF4 in MeOH. The X-ray structure of 4 shows the bridging coordination mode of the diazaferrocene ligands with a nearly linear geometry at the silver atoms.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891221212
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  • 2
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Imidazols, III. 2-Telluroimidazoline  -  stabile Tellurocarbonyl-Verbindungen (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2047-2049 
    Details
    ISSN: 0009-2940
    Keywords: 2-Telluroimidazolines ; 125Te NMR ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Imidazole Chemistry, III[1].  -  2-Telluroimidazolines  -  Stable Tellurocarbonyl Compounds2-Telluroimidazolines 6 are obtained as stable solids from the imidazol-2-ylidenes 4 and tellurium in good yields. The X-ray structure of 6c reveals the relevance of the mesomeric structure 5 [d(C1 - Te) = 2.087(4) Å] which is confirmed by the upfield shift in the 125Te NMR spectra (dL 〈  - 150).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260914
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  • 3
    Electronic Resource
    Electronic Resource
    Heterocyclen als Liganden, V: Synthese und Charakterisierung von 2,3,4,5-Tetramethyl-1-azaferrocen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1891-1896 
    Details
    ISSN: 0009-2940
    Keywords: Azaferrocene, tetramethyl- ; Trihydropyrrolylboranate coordination ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocycles as Ligands, V.  -  Synthesis and Characterization of 2,3,4,5-Tetramethyl-l-azaferroceneC5H5Fe(C4Me4N) (7) is obtained by deprotonation of the pyrrole complex [C5H5Fe(C4Me4NH)]BF4 (6). The nitrogen basicity of 7 resembles closely that of alkylpyridines (pKa = 7.2). Complex 7 reacts with Lewis acids to give the adducts [C5H5Fe(C4Me4NR)]+ [8, 9; R = CH3, C(O)CH3] and C5H5Fe(C4Me4NE) [10, 11; E = BH3, Fe(CO)4]. The X-ray structure of the pyrrolyltrihydroborate complex 10 is isosteric with pentamethylferrocene and has a metallocene structure with an eclipsed ligand conformation.
    Notes: Die Synthese von C5H5Fe(C4Me4N) (7) gelingt durch Deprotonierung des Pyrrol-Komplexes [C5H5Fe(C4Me4NH)]BF4 (6). Komplex 7 entspricht in seiner Stickstoff-Basizität den Alkylpyridinen (pKs = 7.2). Durch Umsetzung mit Lewis-Säuren werden die Addukte [C5H5Fe(C4Me4NR)]+ [8, 9; R = CH3, C(O)CH3] und C5H5Fe(C4Me4NE) [10, 11; E = BH3, Fe(CO)4] erhalten. Nach der Kristallstrukturanalyse ist der zu Pentamethylferrocen isostere Pyrrolyltrihydroborat-Komplex 10 ein Metallocen mit ekliptisch angeordneten Ringliganden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891221010
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Silylierung sterisch überfrachteter Pyrrole (1993)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 285-287 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Silylation of Sterically Overcrowded Pyrroles
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19933350313
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  • 5
    Electronic Resource
    Electronic Resource
    Synthese von N-tert-Butyl-4-(tert-butylimino)-2-penten-2-amin (1987)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 727-728 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of N-tert-Butyl-4-(tert-butylimino)-2-penten-2-amineN-tert-Butyl-4-(tert-butylimino)-2-penten-2-amine (5) has been prepared by stepwise exchange of oxygen in acetylacetone (1) by tert-butylamino groups followed by deprotonation. For the first step 1→2 either silylated 1 or 1 and an excess of Et2O—BF3 is required. The title compound 5 forms a single isomer in solution which is supposedly of the “U” type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198719870818
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  • 6
    Electronic Resource
    Electronic Resource
    Derivate des Imidazols. XXIII. 2-Iminoimidazolin-Derivate des Magnesiums und AluminiumsProfessor Günter Schmid zum 60. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 554-560 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230186
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  • 7
    Electronic Resource
    Electronic Resource
    Derivate des Imidazols. XXII. Imidazoliniminato-Komplexe des Titans. Synthese und Kristallstrukturen von [(ImN)TiCl3]2 und [(ImN)TiCl3 · 2 MeCN] (ImN = 1,3-Dimethylimidazolin-2-imino)Professor Joachim Strähle zum 60. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 769-774 
    Details
    ISSN: 0044-2313
    Keywords: Titanium complexes ; imidazolinimiato complexes ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Imidazole Derivatives. XXII. Imidazoliniminato Complexes of Titanium. Syntheses and X-Ray Structures of [ImNTiCl3]2 and [ImNTiCl3 · 2 MeCN] (ImN = 1,3-Imidazolin-2-imino)1,3-Dimethyl-2-trimethylsilyliminoimidazoline(ImNSiMe3, 7) reacts with TiCl4 in n-pentane to give the dinuclear complex [(ImN)TiCl3]2 (8) which is transferred into the mononuclear compound (ImN)TiCl3 · 2 MeCN (9) on treatment with acetonitrile. The X-ray structure analyses demonstrate the strong donor ability of the imidazoliniminato substituent both in the terminal and bridging coordination mode similar to that of the phosphaniminato group R3PN.
    Notes: 1,3-Dimethyl-2trimethylsilyliminoimidazolin(ImNSiMe3, 7) reagiert mit TiCl4 in n-Pentan zum Zweikernkomplex[(ImN)TiCl3]2 (8), der durch Acetonitril in die einkernige Verbindung [(ImN)TiCl3 · 2 MeCN] (9) überführt wird. Die Kristallstrukturanalyse zeigt die starken Donoreigenschaften der Imidazoliniminato-Gruppe ImN in verbrückender wie endständiger Koordination vergleichbar der des Phosphaniminato-Liganden R3PN.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.199762301121
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  • 8
    Electronic Resource
    Electronic Resource
    Derivate des Imidazols. XXIV [1].[Li12O2Cl2(ImN)8(THF)4] · 8 THF: Ein Peroxo-Komplex des Lithiums mit neuartiger KäfigstrukturProfessor Welter Siebert zum 60. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1121-1124 
    Details
    ISSN: 0044-2313
    Keywords: Lithium ; imidazole derivatives ; peroxo complexes ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Imidazole Derivatives. XXIV. [Li12O2Cl2(ImN)8(THF)4] · 8 THF: a Peroxo Lithium Fragment in a Novel Cage Structure1,3-dimethyl-2-iminoimidazoline (8, ImNH) reacts with methyl lithium to give [ImNLi]n (9). In tetrahydrofuran, crystals of C56H96Cl2Li12N24O6 · 8 C4H8O (10) are obtained. The structure of 10 consists of a Li12Cl2N8O2 core in which a peroxo unit is incorporated into a stack of ladder fragments. Over all, four tetrahydrofuran and eight imidazoline ligands are attached at the lithium and nitrogen atoms.
    Notes: 1,3-Dimethyl-2-iminoimidazolin (8, ImNH) reagiert mit Methyllithium in Diethylether zu [ImNLi]n (9). In Tetrahydrofuran werden Kristalle von [Li12O2Cl2(ImN)8(THF)4] · 8 THF (10) erhalten. In 10 liegt ein Li12Cl2N8O2-Käfig in Form gestapelter Leiterfragmente mit O22 als zentraler Einheit vor. Hieran sind über die Lithium- und Stickstoffatome insgesamt vier Tetrahydrofuran- und acht Imidazolin-Liganden koordiniert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230719
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  • 9
    Electronic Resource
    Electronic Resource
    Derivate des Imidazols, VII. 2,3-Dihydro-1,3,4,5-tetramethyl-2-methylen-1H-imidazol als Kupplungsreagens. Die Kristallstruktur von Bis(1,3,4,5-tetramethyl-2-imidazolyl)methylium-iodid (1993)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 1149-1151 
    Details
    ISSN: 0170-2041
    Keywords: Imidazoles ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Imidazole Derivatives, VII. - 2,3-Dihydro-1,3,4,5-tetramethyl-2-methylen-1H-imidazole as Coupling Reagent. The X-ray Structure of Bis(1,3,4,5-tetramethyl-2-imidazolyl)methylium Iodide2,3-Dihydro-1,2,3,4-tetramethyl-2-methylen-1H-imidazole (1) reacts with 1,3,4,5-tetramethyl-2-(methylthio)imidazolium iodide (4) in the presence of pyridine to give bis(1,3,4,5-tetramethyl-2-imidazolyl)methylium iodide (5) which is also formed by the reaction of 4 and methyl lithium in the ratio 2:3. The X-ray structure of 5 is reported.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1993199301184
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