Mesoporous mixed metal oxide nanocrystals: Efficient and recyclable heterogeneous catalysts for the synthesis of 1,2-disubstituted benzimidazoles and 2-substituted benzothiazoles

Sulfonic acid-functionalized mesoporous silica (SBA-Pr-SO3H) as solid acid catalyst in organic reactions

“…Investigations by Cheng and co-workers has also confirmed these results [181]. [186], p-TsOH/SiO 2 [187], and mesoporous mixed metal oxide nano-crystals [188] was also investigated in this reaction.…”

Recent advances on the transition-metal-catalyzed synthesis of imidazopyridines: an updated coverage

“…Recently, A 3 coupling of alkynes, aldehydes, and aminopyridines have been developed for efficient syntheses of IPs [20]. In recent years much attention has been paid towards the exploration of transition metals (TMs) as homogeneous as well as heterogeneous catalytic system like Pd(OAc) 2 [21], CuI [22], ZnO [23], ZnI 2 [24], Cu(OTf) 2 [25], Sc(OTf) 3 [26], RuCl 3 [27], [Cp * RhCl 2 ] 2 (Cp * : pentamethylcyclopentadiene) [28], FeCl 3 [29], NiFe 2 O 4 [30], CuO [31], mixed-metal oxides [32] etc. Some of the reactions have utilized metal salts like Cu(OAc) 2 , Ag 2 CO 3 , AgOAc, etc.…”

Copper doped K-birnessite as an efficient catalyst for the synthesis of 2-aryl benzimidazoles

“…The selectivity in forming 1,2-diaryl benzimidazole and 2-aryl benzimidazole has high interest in the literature studies [24][25][26][27][28][29][30][31][32][33]. In the literature, there are more methods for synthesizing 1,2-diaryl benzimidazoles [24][25][26][27][28][29][30] compared to preparing 2-aryl benzimidazoles with ideal selectivity [31][32][33].…”

“…In the literature, there are more methods for synthesizing 1,2-diaryl benzimidazoles [24][25][26][27][28][29][30] compared to preparing 2-aryl benzimidazoles with ideal selectivity [31][32][33]. A careful analysis of the existing literature indicates that not many studies have been conducted at understanding the synthesis of benzimidazole derivatives by the condensation of o-phenylenediamine (o-PD) and aromatic aldehydes in different solvents using copper modified manganese oxides as a catalyst.…”