CAS Registry Number

CAS 4457-32-3 — 4-Nitrobenzyl chloroformate

4-Nitrobenzyl chloroformate is a versatile organic intermediate used primarily in peptide synthesis, solid-phase organic chemistry, and the preparation of protecting groups for amines and alcohols. It reacts selectively under mild conditions to form stable carbamates, making it valuable in drug discovery and biochemical research. This chemical has a CAS number of 4457-32-3, a molecular formula of C8H5ClNO4 (not C7ClF5O—likely a typographical error), and a molecular weight of 230.51 g/mol. It requires storage at temperatures not exceeding +4°C and carries no EU hazard classification signal word. Molekula supplies 4-nitrobenzyl chloroformate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.