Synergistic role of Lewis and Brönsted acidities in Friedel–Crafts alkylation of resorcinol over gallium-zeolite beta

Alkylation of isobutane/isobutene using Brønsted–Lewis acidic ionic liquids as catalysts

“…It is suggested that the synergism between the Lewis and Brønsted sites exists and plays an important role in the reaction. This result was similar to that of the resorcinol Friedel-Crafts alkylation reaction conducted over gallium-zeolite beta [25]. Interestingly, the addition of water had a promoting effect on the reaction.…”

Determination of different acid sites in Beta zeolite for anisole acylation with acetic anhydride

“…1447 cm À1 in the spectra could be attributed to the adsorbed pyridine bound coordinative with Lewis acid sites, and the absorption bands at ca. 1545 cm À1 could be assigned to pyridine interacting with Brönsted acid sites [30]. To calculate the concentrations of Brönsted and Lewis acid sites, denoted by C B and C L , the corresponding values of integrated molar extinction coefficients (1.67 and 2.22 cm/lmol, respectively) were applied as suggested in Ref.…”

Development of Brönsted–Lewis acidic solid catalytic system of 3-methyl-1-sulfonic acid imidazolium transition metal chlorides for the preparation of bis(indolyl)methanes

“…In recent years, many reports have been spotted utilizing ionic liquids both as catalysts and medium in numerous organic conversions. They can be designed as homogeneous, heterogeneous or multiphase catalytic frameworks as per required reactivity to run a reaction in combination with various metals salts, Lewis acids, Brønsted acids, and polymers etc [13][14][15][16][17][18][19][20][21][22][23][24]. Development of prospective heterogeneous catalytic systems is our best interest.…”

“…Development of prospective heterogeneous catalytic systems is our best interest. As we know, both Lewis and Brönsted acids play important roles in acid catalysed processes [19][20]. These considerations incited us to construct three new catalytic frameworks of 3-methyl-1-sulfonic acid imidazolium transition [25][26][27].…”