4-Bromo-1-butyne is used for pharmaceutical intermediates.
Praud, A.; Bootzeek, O.; Blache, Y. Synthesis of polymerizable vinyltriazoles: development of an optimized one-pot strategy starting from 4-bromobutyne. Green Chem. 2013, 15 1138-1141.
Yastrebov, V. V.; Chernyshev, A. I. Dynamic models of associates of paramagnetic reagents with substrates having a flexible structure in the interpretation of PMR paramagnetic shifts for the case of Eu(fod)3 -1-methoxy-4-bromobut-2-yne. J. Struct. Chem. 1976, 17 (6), 866-871.
Hazard Statements: H226-H301-H317
Flammable liquid and vapour. Toxic if swallowed. May cause an allergic skin reaction.
Precautionary Statements: P260-P201-P280a-P304+P340-P405-P501a
Do not breathe dust/fume/gas/mist/vapours/spray. Obtain special instructions before use. Wear protective gloves and eye/face protection. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.