Electrophilic substitution of aromatics on zeolites is generally assumed to occur through the Wheland-type intermediate, although direct experimental evidence is lacking. Now, this carbenium ion has been identified as a stable intermediate in the alkylation of benzene with ethanol on an industrial zeolite catalyst.
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Blasco, T. Identification of Wheland-type intermediates. Nat Catal 1, 8–9 (2018). https://doi.org/10.1038/s41929-017-0012-2
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DOI: https://doi.org/10.1038/s41929-017-0012-2