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Aerobic Oxidations Catalyzed by Zeolite‐Encapsulated Cobalt Salophen
Author(s) -
Johansson Mikael,
Purse Byron W.,
Terasaki Osamu,
Bäckvall JanE.
Publication year - 2008
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.200800294
Subject(s) - chemistry , cobalt , catalysis , hydroquinone , zeolite , benzoquinone , electron transfer , palladium , inorganic chemistry , photochemistry , organic chemistry
Cobalt salophen was encapsulated in a series of zeolites with a wide variation of the silicon‐to‐aluminium atomic ratio and with different cations. The zeolite‐cobalt salophen catalysts were prepared using the “ship‐in‐a‐bottle technique” where the complex was synthesized in the super cage of the zeolite and therefore locked into the pocket. The encapsulated catalysts were then tested in the aerobic oxidation of hydroquinone to p ‐benzoquinone; the best encapsulated catalyst was shown to be an efficient electron‐transfer mediator in a palladium‐catalyzed aerobic oxidative carbocyclization.