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
Filter
  • Homogeneous catalysis  (1)
  • Inorganic Chemistry  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 2327-2335 
    ISSN: 1434-193X
    Keywords: Quaternary carbon atoms ; Palladium ; Homogeneous catalysis ; Configuration determination ; NOE ; Taft parameter ; Diastereoselectivity ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1,2-asymmetric induction in the formation of new quaternary centers by palladium-catalyzed allylation of substituted cyanoacetates 1a-c was controlled by using 2,9-disubstituted 1,10-phenanthrolines as ligands, giving the allylated products 3a-c with like/unlike diastereoselectivities up to 94:6. The increased selectivities were caused by a tight wrapping of the allyl unit in the intermediate complexes. Differences in stereoselectivity for varying substrates can be understood when modified Taft parameters, the homo-Es values, are considered. The like/unlike isomers were assigned by using a combination of molecular modeling, NOE measurements and analyses of chemical shifts. An X-ray analysis of the acid 14 confirmed the structural assignment.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1973-1977 
    ISSN: 0044-2313
    Keywords: Hexachloro-μ-dichloro-bis[N-(trimethylsilyl)imidazol]dititanium Chloroform(1/2) ; single crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure Determination of Hexachloro-μ-dichloro-bis[N-(trimethylsilyl)imidazol]dititanium Chloroform (1/2)Hexachloro-μ-dichloro-bis[N-(trimethylsilyl)-imidazol]dititanium chloroform (1/2) 1 has been prepared by the reaction of titanium tetrachloride with N-trimethylsilylimidazole (NTMSI) in chloroform solution as orange crystals. The structure consists of two distorted TiCl5N octahedrons, which are connected by two chlorine atoms via common edges to a centrosymmetric dimer [Ti2Cl8(NTMSI)2] · 2 CHCl3. The N-trimethylsilylimidazole ligands each are located at one axial position of each octahedron, whereas the equatorial positions are occupied by the chloro ligands. The results presented are discussed assuming a gradual formation of an 1 : 1 and 1 : 2 adduct.
    Notes: Hexachloro-μ-dichloro-bis[N-(trimethylsilyl)imidazol]dititan-Chloroform (1/2) 1 wurde durch Reaktion von Titantetrachlorid mit N-Trimethylsilylimidazol (NTMSI) in Chloroform-Lösung als orangefarbene Kristalle erhalten. Die Struktur besteht aus zwei verzerrt oktaedrisch koordinierten TiCl5N-Oktaedern, welche über eine gemeinsame Kante aus zwei Chloratomen zu einem zentrosymmetrischen Dimer [Ti2Cl8(NTMSI)2] ·2 CHCl3 verknüpft sind. Die N-Trimethylsilylimidazol-Liganden besetzen jeweils eine der axialen Positionen in beiden Oktaedern, während die äquatorialen Positionen von Chlor-Liganden besetzt sind. Die vorgestellten Ergebnisse werden unter der Annahme einer stufenweisen Bildung einer 1 : 1 und 1 : 2 Additionsverbindung diskutiert.
    Additional Material: 2 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...