Sulfonic acid-functionalized ordered nanoporous Na+- montmorillonite (SANM) as an efficient and recyclable catalyst for the tetrahydropyranylation and detetrahydropyranylation of alcohols and phenols

Sulfonic acid-functionalized ordered nanoporous Na?-montmorillonite, as a newly reported solid acid nanocatalyst, was efficiently used for the tetrahydropyranylation and detetrahydropyranylation of alcohols and phenols. All reactions were performed at room temperature in high to excellent yields. Ease of preparation and handling of the catalyst, heterogeneous reaction conditions, easy work-up of the products, high reaction rates and reusability of the catalyst are the main advantages of this method.