Synthesis of Chalcone and Flavanone Derivatives from Condensation of 2’-Hydroxyacetophenones and Benzaldehyde over Basic &lt;i&gt;β&lt;/i&gt;-Zeolites

崇, 山城; 廣大, 成田; 寛次, 佐藤; 正幸, 野村; 真一, 中田

doi:10.1627/jpi.53.351

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…For instance, the exchange with alkali ions of β zeolites has frequently been used to increase their basicity and correspondingly decrease their acidity [18][19][20][21][22][23]. Thus, the alkali-ion exchanged forms of β zeolites were used to serve as base or acid-base bifunctional catalysts for a number of reactions, including the side-chain alkylation of toluene [24][25][26], Knoevenagel reactions [27,28], and Michael addition reactions [27,29]. Alkali-ion exchanged β zeolites (M x Na 1-x β, M = Li + , Na + , K + , Rb + or Cs + ) were prepared and employed recently to catalyze the LTA reaction under different conditions in our laboratory.…”

Section: Introductionmentioning

confidence: 99%

Sustainable production of acrylic acid: Rb+- and Cs+-exchanged Beta zeolite catalysts for catalytic gas-phase dehydration of lactic acid

Yan

Mahmood

et al. 2016

Catalysis Today

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Rb + -and Cs + -exchanged Beta zeolites (Rb x Na 1-x β and Cs x Na 1-x β) of varying exchange degrees (x = 0~1.00) were employed to catalyze the gas-phase dehydration of lactic acid (LA) for sustainable production of acrylic acid (AA) in a flow fixed-bed reactor at 360 o C, using an aqueous solution of LA (10 mol% or 35.7%) as the reaction feed at a weight hourly space velocity by LA of 2.1 h -1 . An appropriate window of the ion exchange degrees for highly selective AA production (≥ 60 mol%) was determined for either series of the samples, i.e., x = 0.85~0.98 for the Rb x Na 1-x β and x = 0.71~0.90 for the Cs x Na 1-x β samples. The best performing catalysts Rb 0.95 Na 0.05 β, and Cs 0.81-0.90 Na 0.19-0.10 β offered the highest AA selectivity (ca. 70 mol%) and yield (ca. 60~65 mol%) for reaction periods of longer than 10 h. Measurements of the surface acidity and basicity of the catalyst samples bytemperature-programmed desorption of NH 3 and CO 2 showed that the highly selective catalysts in such widows should have both weakly acidic and weakly basic surface sites with suitably balanced acidity and basicity. The acid-catalyzed decarbonylation/decarboxylation and base-catalyzed condensation of LA, which lead respectively to formation of acetaldehyde and 2,3-pentanedione, always occurred as the competing reactions over the investigated catalysts. Observations on the catalyst selectivity changes for these competing reactions clearly demonstrate that the suitably balanced acidity and basicity at the catalyst surface is the key to the high selectivity for the desired dehydration reaction.

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Section: Introductionmentioning

confidence: 99%

Sustainable production of acrylic acid: Rb+- and Cs+-exchanged Beta zeolite catalysts for catalytic gas-phase dehydration of lactic acid

Yan

Mahmood

et al. 2016

Catalysis Today

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“…In fact, the ion-exchange of faujasite zeolites with high Al contents has been intensively studied because of their high ion-exchange capacities and strong basicity [16][17][18]. Beta-CV has been studied for the ionexchange with alkali metal cations and application as a base catalyst for Knoevenagel condensation, Michael addition and so on [19][20][21]. However, there are only few reports on the ion-exchange with alkali metal cations and base catalysis for Beta-OF.…”

Section: Introductionmentioning

confidence: 99%

Cs-Beta with an Al-rich composition as a highly active base catalyst for Knoevenagel condensation

Otomo

Osuga

Kondo

et al. 2019

Applied Catalysis A: General

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Ion-exchange of an Al-rich zeolite beta, synthesized by organic structure-directing agentfree method (Beta-OF), was studied for application as a base catalyst. While the as-synthesized Beta-OF in Na-form itself had base sites and showed moderate catalytic activity for Knoevenagel condensation, the ion-exchange with Cs + improved the catalytic activity. For Knoevenagel condensation of benzaldehyde with ethyl acetoacetate, the catalytic activity of Beta-OF ionexchanged with Cs + largely surpassed that of the conventional zeolite beta with less Al content. CO2-TPD and IR observation with chloroform as a probe molecule revealed that the Cs-exchanged Beta-OF had strong base sites comparable to Cs-exchanged Y zeolite. Base strength of Beta-OF was stronger than that expected by Sanderson's theory. A local high density of Al atoms in the framework of Beta-OF resulted in the unexpected base property and high catalytic activity.

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A cascade catalytic system of photocatalytic oxidation based on Cu@PCN-222(Ni) and enzyme catalysis for the synthesis of chalcone compounds in one pot

Liu²,

Fan³

et al. 2022

Journal of Catalysis

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Synthesis of Chalcone and Flavanone Derivatives from Condensation of 2’-Hydroxyacetophenones and Benzaldehyde over Basic <i>β</i>-Zeolites

Cited by 5 publications

References 4 publications

Sustainable production of acrylic acid: Rb+- and Cs+-exchanged Beta zeolite catalysts for catalytic gas-phase dehydration of lactic acid

Sustainable production of acrylic acid: Rb+- and Cs+-exchanged Beta zeolite catalysts for catalytic gas-phase dehydration of lactic acid

Cs-Beta with an Al-rich composition as a highly active base catalyst for Knoevenagel condensation

A cascade catalytic system of photocatalytic oxidation based on Cu@PCN-222(Ni) and enzyme catalysis for the synthesis of chalcone compounds in one pot

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