ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
    ISSN: 0947-3440
    Keywords: Peterson olefination ; Horner Emmons olefination ; Diastereoselective aprotic Michael cascade reaction ; Tricyclo[3.2.1.02,7]octanes ; Bicyclo[3.2.1]octanes ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Starting from the easily accesible chiral aldehyde 2, we obtained enantiomerically pure (Z)- and (E)-α,-chloro-α,β-unsaturated esters 4c in good yields by olefination reactions. (Z)-and (E)-4c were allowed to react with the kinetically controlled generated lithium dienolate Li-7 to give the enantiomerically pure tricyclo[3.2.1.02,7]octanes 8 and 9, respectively. The „push-pull“ substituted cyclopropane moiety of 8 was opened to give solely bicyclo[3.2.1]octane 10.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1235-1240 
    ISSN: 0009-2940
    Keywords: Phosphorus ; Phase transitions ; Molecular crystal ; Crystal growth ; Low-temperature crystal structure ; Librational motion ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: White phosphorus occurs in three modifications. The α form, which exists at roomtemperature, transforms reversibly to the β form at -77°C. The α · β transformation may be strongly delayed. Quenching the α form to -185°C followed by slow warming results in an exothermic reactions with formation of the γ form which transforms into the β form at -120°C in an endothermic reaction. A transition β · γ is not observed. The γ form is characterized by its powder diagram. The structure of the β form is redetermined from a single crystal at -185°C (P., α = 547.88(5), b = 1078.62(11), c = 1096.16(11)pm, α= 94.285(8), β = 99.695(7), γ = 100.680(7)., V = 623.79(10) · 106 pm3, Z = 6 formula units per cell). The P4 molecules exhibit pronounced librational motion in spite of the low temperature of investigation. The arrangement of the centers of the tetrahedra corresponds to the atom positions in the γ-plutonium structure, which is discussed in relation to the bcc structure.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 612 (1992), S. 56-62 
    ISSN: 0044-2313
    Keywords: 1λ5,3λ5-diphosphete ; addition compounds with GeCl2, SnCl2, (CO)5W(Z-cyclooctene) ; n.m.r., i.r., mass spectra ; X-ray structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,1,3,3-Tetrakis(dimethylamino)-1λ5,3λ5-diphosphete as Ligand in Coordination Compounds1,1,3,3-Tetrakis(dimethylamino)-1λ5,3λ5-diphosphete, 1, reacts with GeCl2 · 1,4-dioxane, SnCl2, and (CO)5W(Z-cyclooctene) to give the complexes {HCP[N(CH3)2]2}2 · GeCl2, 3, {HCP[N(CH3)2]2}2 · SnCl2, 4, and {HCP[N(CH3)2]2}2 · W(CO)5, 5, respectively. The n.m.r., mass, and i.r. spectra of the new compounds as well as the crystal and molecular structures of 3 and 4 are reported and the bonding situation in compounds 3-5 is discussed.
    Notes: 1,1,3,3-Tetrakis(dimethylamino)-1λ5,3λ5-diphosphet, 1 bildet mit GeCl2 · 1,4-Dioxan, SnCl2 bzw. (CO)5W(Z-cycloocten) die komplexe {HCP[N(CH3)2]2}2 · GeCl2, 3, {HCP[N(CH3)2]2}2 · SnCl2, 4, bzw. {HCP[N(CH3)2]2}2 · W(CO)5, 5. Die NMR-, Massen- und IR-Spektren der neuen Verbindungen sowie die Kristall- und Molekülstruktur von 3 und 4 werden mitgeteilt und die Bindungsverhältnisse in den Verbindungen 3-5 diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...