Used primarily as a protecting group reagent in organic synthesis, especially in the preparation and modification of peptides and nucleotides. It allows selective protection of amine functionalities due to its stability under various reaction conditions and can be removed under mild acidic conditions. Commonly employed in pharmaceutical synthesis where controlled deprotection is required. Its chloroethyl moiety enables efficient deprotection through solvolysis, making it valuable in multi-step synthetic routes. Also utilized in the development of agrochemicals and specialty polymers requiring precise functional group manipulation.