“…Acid catalysts play a predominant role in organic synthesis, in particular tetrahydropyranylation. Due to its ease of handling and recovering, various solid acids were introduced, which include protic acids [2,3], Lewis acids [4,5], ion exchange resins [6,7], solid silica-based sulfonic acid [8], zeolites [9,10], hetropolyacids [11,12], and clays [13,14]. The main problems associated with solid acids are the complicated preparation procedure, corrosiveness, the expense, the harsh reaction conditions, the need for solvents such as CH 2 Cl 2 , as well as unsatisfactory product yields, etc.…”