Zeolite Effects on Catalytic Transformations of Fine Chemicals

Vos, Dirk De; Jacobs, Pierre

doi:10.1142/9781860949555_0013

Cited by 2 publications

(2 citation statements)

References 35 publications

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“…Topology describes the shape of the three-dimensional space in which the components of the supramolecular assembly are found. For example, the MFI family of zeolites to which NaZSM-5 belongs defines a reaction space of parallel channels intersecting with sinusoidal channels …”

Section: Discussionmentioning

confidence: 99%

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Selective Solid State Photooxidant

et al. 2003

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Irradiation of biphenyl encapsulated in the cavities of a NaZSM-5 zeolite framework has been reported to result in the formation of an extremely long-lived radical cation. Here, we show that such zeolite encapsulated radical cations can act as irreversible one-electron oxidants for simple alkenes and dienes, in a solid-state analogue to solution-phase cosensitization. Compared to the well-known semiconductor photooxidizers, such as titanium dioxide, the NaZSM-5 zeolite-based solid photooxidants exhibit enhanced selectivity based on oxidation potential, molecular size and shape, and Lewis base character.

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Section: Discussionmentioning

confidence: 99%

“…The use of different organic radical cations would allow much finer control over oxidizing power than that available via manipulation of a semiconductor band levels 2b , we hoped to gain further control and selectivity on the oxidation process beyond that possible in solution or on the surface of a semiconductor particle …”

Section: Introductionmentioning

confidence: 99%

Selective Solid State Photooxidant

et al. 2003

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Retro‐Diels–Alder Reactions of Masked Cyclopentadienones Catalyzed by Heterogeneous Brønsted Acids

Demuynck

Levecque

Kidane³

et al. 2010

Adv Synth Catal

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Abstract:The zeolite H-Beta catalyzes the retroDiels-Alder reaction of a range of cyclopentadiene cyclo-adducts at moderate temperatures and ambient pressure, in the presence of an active dienophile. The active catalyst was identified and optimum reaction conditions established after screening a range of zeolites in the retro-Diels-Alder reaction of the cyclopentadiene adduct of cyclopentenone. Our results suggest that retro-Diels-Alder reactions of tricyclodecadienones are catalyzed by Brønsted acids and the high catalytic performance of H-Beta catalysts can be ascribed to the optimal balance between the number of acid sites and their strength as well as to the accessibility of these sites. The methodology was then applied to a series of alkyl derivatives of cyclopentadienylcyclopentenones to provide a viable alternative synthetic route to 4-alkylcyclopentenones and the versatility of the approach was demonstrated by the successful cycloreversion of N-cyclohexyl-2-azanorborn-5-ene.

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Zeolite Effects on Catalytic Transformations of Fine Chemicals

Cited by 2 publications

References 35 publications

Selective Solid State Photooxidant

Selective Solid State Photooxidant

Retro‐Diels–Alder Reactions of Masked Cyclopentadienones Catalyzed by Heterogeneous Brønsted Acids

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