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  • 1
    ISSN: 1434-1948
    Schlagwort(e): Carbene complexes ; Carboxylato complexes ; Density functional calculations ; Palladium ; Rhodium ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The structures of several complexes arising from the interaction between methylene and palladium and rhodium diformates were optimized through density functional calculations. For palladium, mono-, di-, and trimeric complexes were considered. The results obtained show that in all cases the most stable structures correspond to complexes in which methylene has inserted in one of the M-O bonds, while metal-carbene complexes are energy minima only for monomeric palladium diformate and for rhodium diformate. Trimeric palladium formate is thermodynamically stable upon fragmentation. However, when it reacts with methylene, fragmentation becomes favorable. The role of the resulting monomeric complex in the olefin cyclopropanation mechanism catalyzed by palladium dicarboxylates is discussed.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 608-609 
    ISSN: 0749-1581
    Schlagwort(e): 13C NMR ; Spirolactones ; Spiroethers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 13C NMR studies of a series of lactones and ethers containing the spiro[4.5] decenering system were carried out. Complete 13C chemical shift assignments were achieved.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 30 (1992), S. 1084-1088 
    ISSN: 0749-1581
    Schlagwort(e): Long-range carbon-proton couplings ; Selective 2D-J spectroscopy ; Chiral lactonic norbornene derivatives ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The determination of 3J(13C,1H) for two sets of diastereoisomeric norbornene-derived lactones was achieved by using fully coupled 13C spectra or the SINEPT-2D method. The stereochemical elucidation of these compounds was performed by using long-range carbo-proton couplings, combined in some cases with NOE techniques and heteronuclear 2D correlations. Torsional angle dependence and the influence of γ-substitution in the 13C-α - C-β - C-gM-1H fragment on 3J(13C,1H) values were verified in these cases.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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