SO3H-functionalized silica for acetalization of carbonyl compounds with methanol and tetrahydropyranylation of alcohols

Metal Organic Frameworks as Solid Acid Catalysts for Acetalization of Aldehydes with Methanol

“…[12,13] However, the use of methanol is desirable due to its availability. [14] Solid acid catalysts can be more tolerant to the use of methanol and in this way acetalization of various aliphatic and aromatic aldehydes with methanol has been reported with Al-MCM-41 [15] and mesoporous aluminosilicate [16] as heterogeneous catalysts under mild reactions conditions at moderate to high temperatures. On the other hand, faujasites have also been reported as solid acid catalyst with triethyl orthoformate for the protection of aldehydes and are notably inefficient using methanol as solvent.…”

Three Component Reaction: An Efficient Synthesis of 3,4‐Dihydropyrimidin‐2(1H)‐ones and Thiones Using Heterogeneous Catalyst

“…Solid-supported reagents [48][49][50][51][52][53][54][55][56][57][58][59] have recently attracted much attention due to their low toxicity, high catalytic activity, moisture and air tolerance, ease of separation, recyclability and low price. This fact has prompted us to initiate an investigation to explore the catalytic activity of solid-supported fluoroboric acid (HBF 4 -SiO 2 ) for useful organic transformations.…”

A Recoverable, Metal-Free Catalyst for the Green Polymerization of ε-Caprolactone

“…53,56,58,60 Building on the feasibility of using organic base and acid catalysts for this polymerization, an immobilized sulfonic acid is used as the catalyst in this work. Propylsulfonic acid moieties were immobilized on various silica supports (Scheme 1) and were evaluated in the ring-opening polymerization of -caprolactone, with a focus on potential catalyst recovery and reuse.…”