CAS Registry Number

CAS 3355-28-0 — 1-Bromo-2-butyne

1-Bromo-2-butyne is a brominated alkyne used primarily as an intermediate in organic synthesis, particularly for forming carbon-carbon bonds in pharmaceuticals, agrochemicals, and advanced materials. It is a colorless to pale yellow liquid with a pungent odor, highly reactive due to its terminal alkyne and bromine functionalities. CAS 3355-28-0, molecular formula C4H5Br, molecular weight 132.9865 g/mol. Stable at ambient temperatures when stored in airtight containers away from moisture and strong oxidizers. Non-hazardous under standard conditions, with no signal word classification. Molekula supplies 1-Bromo-2-butyne from research to bulk quantities with full documentation and ISO 9001:2015 traceability.