Used as a reagent in organic synthesis, particularly in the protection and deprotection of hydroxyl and amino groups due to its ability to form stable carbonate derivatives. Commonly employed in peptide and carbohydrate chemistry where selective functional group manipulation is required. Its reactivity allows for mild and efficient introduction of the benzyloxycarbonyl (Cbz) protecting group under controlled conditions. Also utilized in the preparation of pharmaceutical intermediates and in polymer chemistry for modifying backbone functionality. The presence of the nitrophenyl group facilitates monitoring of reaction progress by UV spectroscopy owing to its strong chromophoric properties.