1997
DOI: 10.1016/s0926-860x(97)00201-9
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FriedalȓCrafts acylation of anisole over zeolite catalysts

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Cited by 55 publications
(29 citation statements)
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“…This conventional route also proved to be economically non-viable due to excess amounts of reactants required beyond the stoichiometric amounts leading to expensive regeneration and energy intensive downstream processing. This has led many scientist to explore novel and effective catalysts viz., H-Beta, H ZSM-5, H Y as they are green and cost effective due to higher conversions, selectivity's and stabilities with simple regeneration of the used catalysts [5][6][7][8][9][10][11]. Heteropolyacids were also found to be potential catalysts due to their high acidity and compatibility to various support materials to enhance their activity [12].…”
Section: Introductionmentioning
confidence: 99%
“…This conventional route also proved to be economically non-viable due to excess amounts of reactants required beyond the stoichiometric amounts leading to expensive regeneration and energy intensive downstream processing. This has led many scientist to explore novel and effective catalysts viz., H-Beta, H ZSM-5, H Y as they are green and cost effective due to higher conversions, selectivity's and stabilities with simple regeneration of the used catalysts [5][6][7][8][9][10][11]. Heteropolyacids were also found to be potential catalysts due to their high acidity and compatibility to various support materials to enhance their activity [12].…”
Section: Introductionmentioning
confidence: 99%
“…The gas-phase acylation of benzene with acetic acid has also been claimed [6], although others have stated that "little success has been achieved with substrates such as toluene and benzene" [7]. From the significant literature on reaction measurements for the acylation of anisole [7][8][9][10][11][12][13], phenol [14][15][16], and other aromatics [17][18][19][20] and olefins [21,22], it is clear that there are problems with catalyst deactivation and selectivity issues, particularly with olefinic reactants [21,[23][24][25].…”
Section: Introductionmentioning
confidence: 99%
“…[58][59][60][61] Estudios realizados utilizando zeolitas Y con diferente proporción de centros ácidos Brønsted y Lewis indican que los centros ácidos Lewis son más activos y selectivos que los centros Brønsted, siendo el orden de actividad coherente con el orden de fuerza ácida de los sitios Lewis y opuesta al de los centros Brønsted. 58 Asimismo, trabajos realizados utilizando zeolitas Y fuertemente desaluminizadas sugieren que las especies de aluminio de fuera de red influyen considerablemente en la actividad catalítica, debido a su interacción con el HCl o bien el agente acilante. 59 Contrariamente, otros estudios indican que la reacción requiere de un minucioso balance entre la población de ambos tipos de centros, existiendo una relación óptima entre acidez Brønsted y Lewis para la reacción.…”
Section: Reacción De Acilación De Friedel-crafts En Catalizadores Sólunclassified
“…58 Mientras que el anhídrido debería ser transformado en un catión acilo, el ácido carboxílico se protonaría sobre los centros Brønsted o se coordinaría a los Lewis. El ácido carboxílico protonado daría lugar a la formación de un éster, mientras que el coordinado y el catión acilo reaccionarían con el anillo aromático produciendo el producto acilado.…”
Section: Esquema 15 Mecanismo De La Reacción De Acilación En Fase Hunclassified
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