Used as an intermediate in peptide synthesis and organic chemistry, particularly in the protection and activation of amino groups. It is commonly employed to introduce the Boc (tert-butoxycarbonyl) protecting group while providing a good leaving group (tosylate) for subsequent alkylation or conjugation reactions. Frequently utilized in the preparation of amino acid derivatives, drug candidates, and functionalized polymers. Its dual functionality allows for sequential reactions in multi-step syntheses, making it valuable in pharmaceutical and biochemical research.