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  • 1
    Electronic Resource
    Electronic Resource
    Carbenium ion properties of octene-1 adsorbed on zeolite H-ZSM-5 (1994)
    Springer
    Catalysis letters 24 (1994), S. 271-284 
    Details
    ISSN: 1572-879X
    Keywords: Octene-1 ; H-ZSM-5 zeolite ; 13C carbon scrambling ; carbenium ion ; 13C CP/MAS NMR ; 2H NMR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract It is shown that octene-1 adsorbed on zeolite H-ZSM-5 at ambient temperature exhibits carbenium ion properties. Namely: (1) According to2H NMR, the proton of the acidic ≡Al-OH-Si≡ group of the zeolite is transferred into the CH2= group of the octene-1 molecule. (2) According to13C NMR the13C label inserted into the terminal CH2= group of the octene-1 molecule is scrambled over its hydrocarbon skeleton. Thermodynamic and kinetic parameters for carbon scrambling are measured within the temperature range 290–343 K. The zeolite framework is shown to favour the formation of the linear rather than branched carbeniumion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811800
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    13C CP/MAS NMR study of isobutyl alcohol dehydration on H-ZSM-5 zeolite. Evidence for the formation of stable isobutyl silyl ether intermediate (1992)
    Springer
    Catalysis letters 13 (1992), S. 395-405 
    Details
    ISSN: 1572-879X
    Keywords: Isobutyl alcohol ; dehydration ; H-ZSM-5 zeolite ; isobutyl silyl ether ; di-isobutyl ether ; carbenium ion ; 13C CP/MAS NMR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Dehydration of isobutyl alcohol selectively labelled with a13C nucleus in the CH2 group (i-BuOH[1−13C]) has been studied on H-ZSM-5 zeolite within the temperature range 296–448 K using13C CP/MAS NMR. The formation of the isobutyl silyl ether intermediate (IBSE) has been detected. It is stable below 398 K. Within the temperature range 398–423 K IBSE decomposes gradually to produce first a butene dimer, probably 2,5-dimethyl-l-hexene and then other butene dimers and oligomers. AtT 〉 423 K scrambling of the selectively labelled carbon of the initial dimeric product over various positions in the carbon skeleton of the final dimers (oligomers) is observed. This is explained in terms of the formation of carbenium ion as the reaction intermediate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00765043
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    Paper (German National Licenses)
    Fulltext
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