Used primarily as a reagent in organic synthesis, especially for the cleavage of ether groups, including methyl and benzyl ethers, making it valuable in the deprotection step during the synthesis of complex organic molecules. Widely applied in the pharmaceutical industry for modifying functional groups in drug intermediates. Also serves as a catalyst in certain alkylation and isomerization reactions. Its strong Lewis acid properties make it effective in promoting various electrophilic reactions. Handles under inert conditions due to high reactivity with moisture and air.