CAS Registry Number

CAS 6940-78-9 — 1-Bromo-4-chlorobutane

1-Bromo-4-chlorobutane is a haloalkane with a four-carbon chain featuring both bromine and chlorine substituents, commonly used as a synthetic intermediate in organic synthesis, pharmaceuticals, and polymer research. It enables selective functionalization in reactions such as nucleophilic substitutions and cross-couplings. This clear, colorless liquid has a CAS number of 6940-78-9, a molecular formula of Cl(CH2)4Br, and a molecular weight of 171.46 g/mol. Store at ambient temperatures under dry conditions. The product carries a signal word of "Warning" due to its moderate hazard profile. Molekula supplies 1-Bromo-4-chlorobutane from research to bulk quantities with full documentation and ISO 9001:2015 traceability.