Superior Performance of Metal–Organic Frameworks over Zeolites as Solid Acid Catalysts in the Prins Reaction: Green Synthesis of Nopol

Abstract

Scheme 1. Prins reaction of b-pinene with formaldehyde.[a] Dr.

Prins cyclization: Synthesis of compounds with tetrahydropyran moiety over heterogeneous catalysts

“…22 Recently, in the work of Čejka and co-workers different types of MOFs materials were used in Prins condensation of β-pinene and paraformaldehyde [32,33]. The results are somewhat in line with the current work, since strong Brønsted acid sites of zeolites BEA and FAU showed significantly lower selectivity to the target Nopol than MOFs with Lewis sites resulting in the former case in an unwanted reaction of pinene isomerization [33]. Activity was also seen to be influenced by the Lewis acidity.…”

Polyoxometalates confined in the mesoporous cages of metal–organic framework MIL-100(Fe): Efficient heterogeneous catalysts for esterification and acetalization reactions

“…It is found that HPW@MIL-100(Fe) shows a high catalytic activity in the reactions conducted, suggesting the applicability of HPW@MIL-100(Fe) in the esterification. By assuming that the esterification takes place predominantly in the cages of HPW@MIL-100(Fe), the yield of the formed ester decreases when the carbon chain length in the monohydric alcohols increases, most likely due to the steric hindrance for the reaction [31]. For comparison, Amberlyst-15, a commercials resin catalyst often used in acid-catalyzed reactions [80,81], was also used in the esterification of acetic acid and n-hexanol.…”

Solvent-Dependent Structural Variation of Zinc(II) Coordination Polymers and Their Catalytic Activity in the Knoevenagel Condensation Reaction

“…[50][51][52][53][54][55][56][57][58][59][60][61] Acidic and basic polymers can exhibit high catalytic activity in condensation reactions like the Pechmann, 62 Knoevenagel, [63][64][65][66][67][68][69][70][71][72][73][74][75][76] and Prins reactions. 77 Coordination polymers can work as catalysts through two different components, viz. the metal ions, which either provide the coordinatively unsaturated nodes and/or form the active metal sites integrated into the linker ligand, and the ligands.…”