Title Silica Sulfuric Acid as a Reusable Catalyst for Efficient and Simple Silylation of Hydroxyl Group Using Hexamethyldisilazane (HMDS) Under Solvent-Free Conditions Type JournalPaper Keywords Not Registered! Abstract Not Registered! Researchers (Third Researcher), (Second Researcher), Bagher Eftekhari-Sis (Second Researcher)