ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Twofold Insertion of Isocyanides into the Ga—Ga Bond of Tetrakis[bis(trimethylsilyl)methyl]digallane(4) (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 897-901 
    Details
    ISSN: 0009-2940
    Keywords: Gallium-Gallium bond ; Isocyanide insertion ; 1,4-Diazabutadiene derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tetrakis[bis(trimethylsilyl)methyl]digallane(4) (1) reacts with tert-butyl or aryl=isocyanides [aryl = phenyl, o-methylphenyl, o-methoxyphenyl, p-methoxyphenyl) by a twofold insertion of the central carbon atoms into the Ga-Ga bond and formation of C-C single bonds. 1,4-Diazabutadiene derivatives bound to two R2Ga groups are formed (2-6), which in contrast to an aluminium analog exhibit only weak interactions between the imine nitrogen atoms and the coordinatively unsaturated gallium atoms as indicated by NMR spectroscopy and the long Ga-N distances in the molecular structures of three products: 2 (R = C6H5), 4 (R = o-MeOC6H4), and 6 (R = CMe3).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290804
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Reactions of Tetrakis[bis(trimethylsilyl)methyl]digallane(4) with Carboxylic Acids  -  Substituent Exchange and Bridging of the Ga—Ga bond by two Carboxylato GroupsDedicated to Prof. Dr. Walter Siebert, on the occasion of his 60th birthday. (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 1425-1428 
    Details
    ISSN: 0009-2940
    Keywords: Gallium - Gallium bonds ; Carboxylato bridges ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Yellow tetrakis[bis(trimethylsilyl)methyl]digallane(4) 1 reacts with two equivalents of the carboxylic acids RCOOH (R = -C6H5, -p-BrC6H4, -3,5-Me2C6H3, -CMe3) to yield almost quantitatively colorless products in which two bis(trimethylsilyl)methyl groups are replaced by two carboxylato ligands. As shown by a crystal structure determination with the 4-bromo-phenyl derivative (3), the Ga—Ga bond is bridged by both carboxylato groups in a chelating manner. The Ga—Ga distance is shortened to 238.5(2) pm (1: 254.1(1) pm) and the coordination number of the Ga atoms increased to four.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961291204
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The Reactions of R2Ga-GaR2 and R2In-InR2 [R = CH(SiMe3)2] with Protic Reagents: Substituent Exchange versus Cleavage of the Element-Element Bond (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 355-360 
    Details
    ISSN: 1434-1948
    Keywords: Gallium ; Indium ; Low-valent compounds ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tetrakis[bis(trimethylsilyl)methyl]digallane(4) (1) with a Ga-Ga single bond and the corresponding diindane(4) 2 with an In-In single bond were treated with different protic reagents: tert-Butyl alcohol did not react with 1 at all, while phenol gave a mixture of unknown products, which could not be separated. The more acidic pentafluorophenol did not react as an acid, but C-F bonds were cleaved to form almost quantitatively the dimer (R2GaF)2 5, which was characterized by a crystal-structure determination. Water and 1 yielded the dimeric dialkylgallium hydroxide 6. The Ga-Ga bond was also cleaved by the reaction of 1 with durylthiophenol (duryl = 2,3,5,6-tetramethylphenyl), which gave two main products: R2Ga(SDuryl) 7 and RGa(SDuryl)2 8. In contrast, the chelating acid dibenzoylmethane reacted by means of a substituent exchange, with the release of two equiv. of bis(trimethylsilyl)methane for each formula unit of 1, to form 9, in which the Ga-Ga bond is retained and each chelating 1,3-diphenyl-1,3-propanedionato ligand is in a terminal position bonded to only one Ga atom, in more than 80% yield. The Ga-Ga bond is shortened [244.1(1) pm] compared to that in the starting compound tetraalkyldigallane(4) 1. The In-In bond of diindane(4) 2 is, however, cleaved in a similar reaction with dibenzoylmethane, and only the fragmentation product dialkyl(1,3-diphenyl-1,3-propanedionato)indium 10 could be isolated.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    Die Reaktion von Tetraalkyldialuminium(4)-, -digallium(4)- und -diindium(4)-Verbindungen mit 3-Chlorperbenzoesäure: Bildung von μ-Carboxylato-O,O′-μ-hydroxo-dielement-Derivaten (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 565-572 
    Details
    ISSN: 0044-2313
    Keywords: Al-Al bond ; Ga-Ga bond ; In-In bond ; reaction with perbenzoic acid ; μ-hydroxo ; μ-carboxylato groups ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Tetraalkyl Dialuminium(4), Digallium(4) and Diindium(4) Compounds with 3-Chloroperbenzoic Acid: Cleavage of the Element-Element Bonds and Formation of μ-Carboxylato-O,O′ μ-Hydroxo Dielement DerivativesTetrakis[bis(trimethylsilyl)methyl]dialane(4) 1, 1digallane(4) 2 und -diindane(4) 3 with the elements Al, Ga, and In in the unusual oxidation state of +2 react with 3-chloroperbenzoic acid by the cleavage of their element-element single bonds. As shown by crystal structure determinations of the Ga (5) and In derivative (6), the products exhibit two dialkylelement fragments bridged by a μ-hydroxo and a μ-carboxylato-O,O′ group in the solid state. Their formation can be described by an insertion of the low valent Al, Ga, or In atoms into the peroxo group. Only the constitution of the Al compound 4 remains unchanged in solution, while the Ga and In analogs partially dissociate to form the compounds R2E(μ-OH)2ER2 and R2E(O2CR′) (E = Ga or In, R = CH(SiMe3)2, R′ = -3-Cl-C6H4), which all were synthesized and isolated in a pure form by other routes.
    Notes: Tetrakis[bis(trimethylsilyl)methyl]dialan(4) 1, -digallan(4) 2 und -diindan(4) 3 mit den Elementen Aluminium, Gallium und Indium in einer ungewöhnlichen Oxidationsstufe von +2 reagieren mit 3-Chlorperbenzoesäure unter Spaltung der Element-Element-Bindungen, Wie durch Kristallstrukturbestimmungen an den Produkten mit Ga (5) und In (6) gezeigt wurde, enthalten die entstehenden Verbindungen im Festkörper zwei Dialkylelementfragmente, die durch eine μ-Hydroxo- und eine μ-Carboxylato-O,O′-Brücke miteinander verbunden sind, so daß sich ihre Bildung formal durch Insertion der niederwertigen Al-, Ga- oder In-Atome in die Peroxogruppe beschreiben läßt. Nur die Konstitution der Al-Verbindung 4 bleibt auch in Lösung unverändert, während die Ga- (5) und In-Verbindung (6) in einem temperaturabhängigen Gleichgewicht teilweise zu R2E(μ-OH)2ER2 und R2E(O2CR′) (E = Ga oder In, R = CH(SiMe3)2, R′ = -3-Cl-C6H4) zerfallen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230188
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...