Selective synthesis of 3-isopropylindole over modified HY zeolites

Selective synthesis of 5-methyl-2-phenylpyridine from carbonyl compounds and ammonia over zeolite catalysts

“…25,26 It is seen that higher yields of 5-methyl-2-phenylpyridine were obtained over zeolites where there is no diffusion limitation of the product. This is also supported by our earlier studies on the synthesis of 2-phenylpyridine 22 and 2-methyl-6-phenylpyridine. 20,21 The pore size of the catalyst must be accessible to reactant and product molecules in order for the reaction to occur.…”

“…[15][16][17][18][19] Earlier studies in our laboratory have also established that the combination of acidity, thermal stability and uniform pore structure of a molecular sieve catalyst provides a good opportunity for the synthesis of large size molecules such as 2-phenylpyridine and 2-methyl-6-phenylpyridine. [20][21][22] The present synthesis of 5-methyl-2-phenylpyridine from acetophenone, propionaldehyde, formaldehyde and ammonia over molecular sieve catalysts in the vapor phase, to the best of our knowledge, is the first such report.…”

HY zeolite promoted free-solvent alkylation of α-methylnaphthalene with long chain olefins in liquid–solid intermittent reaction

“…In order to overcome these problems, many efforts have been devoted to the search of various heterogeneous acid catalysts to replace the homogeneous acid catalysts, which include clays, amorphous silica-alumina, mixed oxides and zeolites. Among solid acid catalysts, zeolites are extensively used on a large scale for the alkylations of aromatics [8][9][10][11]. Venuto et al observed Beta and Y zeolites to be better catalysts for benzene alkylation with olefins than amorphous silica-alumina gels [12].…”

Alkylation of ?-Methylnaphthalene with Long-Chain Olefins over Large-Pore Zeolites

“…In order to overcome these problems, many efforts have been devoted to the search of various heterogeneous acid catalysts to replace the homogeneous acid catalysts, which include clays, amorphous silica-alumina, mixed oxides and zeolites. Among solid acid catalysts, zeolites are extensively used on a large scale for the alkylations of aromatics [6][7][8][9]. Venuto et al…”