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  • 1
    Digitale Medien
    Digitale Medien
    Reaction of piperidine with formaldehyde over alumina and spinel aluminates (1996)
    Springer
    Catalysis letters 38 (1996), S. 53-56 
    Details
    ISSN: 1572-879X
    Schlagwort(e): piperidine ; formaldehyde ; 3-alkylpyridine ; selective synthesis ; mechanism
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The reaction of piperidine with formaldehyde over γ-alumina, Na+-γ-alumina, NiAl2O4 and CuAl2O4 was studied as a model system in order to understand the mechanism and selectivity of alkylpyridine formation from piperidine and carbonyl compounds. Along with the expected 3-picoline, 2-picoline and other products were also formed. The selectivity for 3-picoline was high on γ-alumina whereas on NiAl2O4, 2-picoline was selectively formed. The formation of the different products has been rationalized and a probable mechanism for the formation of 2-picoline has been presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00806899
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Spectral separation of two very closely related organic compounds by 1D TOCSY (1994)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 32 (1994), S. 452-457 
    Details
    ISSN: 0749-1581
    Schlagwort(e): NMR ; 1D TOCSY ; z-Filtering ; 2,7-Dioxatetracyclo[3.3.04,9.08,11]undeca-3,6-dione ; 8,10,11-Trioxapentacyclo[5.4.1.02,6.04,11.05,9]dodecane ; 2,8-Dioxatetracyclo[3.3.3.06.0.03,10]undecan-4-ol ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The use of one-dimensional total correlation spectroscopy (1D TOCSY) combined with the z-filtration technique to generate pure phase subspectra of individual isomers from the spectrum of the corresponding mixture without any chemical separation of the mixture is described. A straightforward spectral assignment is achieved for the isomers obtained on lithium aluminium hydride reduction of 2,7-dioxatetracyclo[3.3.04,9.08,11] undeca-3,6-dione (dilactone) by studying the subspectrum of each isomer as a function of the propagation time of magnetization through the network of coupled protons.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1260320804
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