Tandem Transesterification-Esterification Reactions Using a Hydrophilic Sulfonated Silica Catalyst for the Synthesis of Wintergreen Oil from Acetylsalicylic Acid Promoted by Microwave Irradiation.

SiO-SOH, with a surface area of 115 m/g and pore volume of 0.38 cmg, and 1.32 mmol H/g was used as a 20% / catalyst for the preparation of methyl salicylate (wintergreen oil or MS) from acetylsalicylic acid (ASA).

Catalytic Transformation of Triglycerides to Biodiesel with SiO-SOH and Quaternary Ammonium Salts in Toluene or DMSO.

SiO-SOH, with a surface area of 115 m·g, pore volumes of 0.38 cm·g and 1.32 mmol H/g, was used as a transesterification catalyst.

Dehydration of D-fructose to 5-hydroxymethyl-2-furfural in DMSO using a hydrophilic sulfonated silica catalyst in a process promoted by microwave irradiation.

SiO-SOH, with a surface area of 115 m/g, pore volumes of 0.38 cmg and 1.32 mmol H/g, was used as a 10% w/w catalyst for the preparation of 5-hydroxymethyl-2-furfural (HMF) from fructose.

Synthesis of Phenyl Esters Using SiO₂-SO₃H Catalyst in Conventional Heating and Microwave-Irradiated Esterification Processes.

A SiO₂-SO₃H amorphous catalyst containing a small surface area of 115.0 m²g and 1.32 mmol H/g was prepared from fine construction sand and sodium carbonate and sulfonated with H₂SO₄.

The preparation of benzyl esters using stoichiometric niobium (V) chloride versus niobium grafted SiO catalyst: A comparison study.

Two solvent free methods of a one-to-one alcohol/acid mol ratio synthesis of benzyl esters of the formic, acetic, benzoic, salicylic, nicotinic, and oxalic acids are described. The stoichiometric reactions used 1.5 mol ratio solid NbCl as the reagent and required from two to three hours for completion at room temperature; for the catalytic processes, NbCl was grafted directly, at room temperature, onto a silica gel of specific area of 507 mg, produced from construction sand and sodium carbonate, forming a 5.