Zeolite Y-Catalyzed versus Superacid-Catalyzed Protium-Deuterium Exchange in Alkanes

Sommer, Jean; Hachoumy, Mohammed; Garin, F.; Barthomeuf, D.

doi:10.1021/ja00091a072

Cited by 55 publications

(24 citation statements)

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“…However, usually, the number of protons is lower because of the dealumination of zeolite framework during the hightemperature treatment. Zeolite solid acids exhibit similar behavior as acids in a solution, and the strength of zeolite Brønsted acid sites is comparable to sulfuric acid [29,30]. In general, the strength of a Brønsted acid is defined via deprotonation energy (DPE) required to dissociate the proton from conjugate anion to an infinite distance [31].…”

Section: Acid Sites In Zeolitesmentioning

confidence: 99%

Analysis and control of acid sites in zeolites

Palčić

Valtchev

2020

Applied Catalysis A: General

102

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The exceptional catalytic performance of zeolites is due to the presence of active sites in a shape-selective environment, i.e., in micropores with molecular dimensions. The present review provides a comprehensive analysis of active sites in zeolite frameworks. It is focused on the active sites generated by the Al incorporation in the framework. The inclusion of other heteroatoms in the zeolite framework is also addressed. After the introduction of zeolite-type materials and a discussion of the structure-properties relationship in zeolites the central part of the review is devoted to i) the analytical methods and their complementarity for the evaluation of the number, strength, and position of active sites and ii) the in situ and post-synthesis methods of acid sites assessment and control. The data presented herein provide guidelines for making zeolite materials by design in terms of acidity.

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Section: Acid Sites In Zeolitesmentioning

confidence: 99%

Analysis and control of acid sites in zeolites

Palčić

Valtchev

2020

Applied Catalysis A: General

102

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“…Lewis-Säure-katalysierter H/D-Austausch unpolarer Arene. [24] In Über-einstimmung mit den Befunden von Otvos et al [25] Boix und Poliakoff berichteten von polymergebundenen Sulfonsäuren (Deloxan), die sie zur Deuterierung von aromatischen Verbindungen einsetzten. So wurden bei der Reaktion von Chinolin (17) oder Ethylbenzol (18) in überkriti-schem D 2 O bei 325 8C hervorragende Deuteriumübertra-gungen erzielt (Schema 9).…”

Section: Ph-wert-abhängiger H/d-austauschunclassified

Die Renaissance des H/D‐Austausches

et al. 2007

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Die steigende Nachfrage nach stabil isotopenmarkierten Verbindungen führt zu einem verstärkten Interesse an H/D‐Austauschreaktionen an Kohlenstoffatomen. Heutzutage werden Deuterium‐markierte Verbindungen als interne Standards in der Massenspektrometrie eingesetzt oder helfen dabei, mechanistische Theorien zu untermauern. Der Zugang zu diesen deuterierten Verbindungen erfolgt über einen Austausch von Wasserstoff gegen Deuterium im Zielmolekül deutlich effizienter und preiswerter als über die klassische Synthese. Schwerpunkt dieses Aufsatzes sind präparative Anwendungen der H/D‐Austauschreaktion zur Herstellung Deuterium‐markierter Substanzen. Die Fortschritte der letzten zehn Jahre werden zusammengefasst und kritisch bewertet.

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“…Neither the b-methylene protons nor the more accessible terminal methyl group were involved in the H/D exchange. Again, as a result of the isotope effect on chemical shifts, [47][48][49] various isotopologues are observed in the early stages of the exchange process: Three peaks assigned to CDH 2 , CD 2 H, and CD 3 for the methyl group and two peaks assigned to CDH and CD 2 for the a-methylene group (Figure 2b).…”

Section: Resultsmentioning

confidence: 99%

Room‐Temperature Alkane Reactivity in Zeolites: An H/D Exchange Study

Sido

Walspurger

Barbiche

et al. 2010

Chemistry A European J

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As evidenced by H/D exchange with acidic zeolites, isoalkanes react readily at room temperature whereas linear alkanes do not. The observed regioselectivity of the exchange process demonstrates that the main factor controlling the reaction is not the accessibility to the acid sites, but the intrinsic reactivity of the alkane. The mechanism is best rationalized by classic organic chemistry involving carbocationic intermediates including the Markovnikov rule.

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Zeolite Y-Catalyzed versus Superacid-Catalyzed Protium-Deuterium Exchange in Alkanes

Cited by 55 publications

References 0 publications

Analysis and control of acid sites in zeolites

Analysis and control of acid sites in zeolites

Die Renaissance des H/D‐Austausches

Room‐Temperature Alkane Reactivity in Zeolites: An H/D Exchange Study

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