Tetrahydropyranylation of Alcohols and Phenols Using Polystyrene Supported Lewis Acids as Catalysts

Abstract

Polystyrene supported TiCl 4 (Ps-TiCl 4 ) and polystyrene supported FeCl 3 (Ps-FeCl 3 ) were prepared by coordinating Lewis acids with polystyrene. The catalysts were characterized by TGA, BET, SEM, IR and pyridine-adsorbed IR. The loading of Ps-TiCl 4 and Ps-FeCl 3 were 0.35 and 0.3 mmol•g -1 respectively. Both catalysts were found to be efficient for the tetrahydropyranylation and detetrahydropyranylation of various alcohols and phenols in different solvents. Two catalysts can be recovered and reused for five times with good activity.

Shape-selective organic–inorganic zeolitic catalysts prepared via interlayer expansion

“…Lewis acids [36], etc. An alternative method is using sulfonic acid functionalized materials such as sulfonic acid functionalized MCM-41 [20].…”

A Green Route to Benzyl Phenyl Sulfide from Thioanisole and Benzyl Alcohol over Dual Functional Ionic Liquids

“…Alky phenyl sulfide derivatives are an important class of synthetic intermediates, which have been applied in synthesis of dyes, perfume, drugs and medicine. [1,2] They can be produced by the reactions of thiophenols with aryl halides over base catalysts (e. g., Na 2 CO 3 ) [3,4] and the reactions of thiophenols with benzyl alcohols (or aromatic formic acid) catalyzed by Lewis acids (e. g., ZrCl 4 , In(OTf) 3 ), [5][6][7] metal supported catalyst, [8,9] and ionic liquids (ILs). [10,11] These synthetic methods generally suffer from their inherent shortcomings, such as low efficiency, requirements for equivalent acid or base catalysts, formation of byproducts and harmful wastes.…”