β-Nitrostyrene is an aromatic compound and a nitroalkene used in the synthesis of indigo dye[1] and the slimicide bromo-nitrostyrene.

[2] β-Nitrostyrene is a chemical precursor for slimicides and dyes.

Specifically bromo-nitrostyrene is obtained upon treatment with bromine followed by partial dehydrohalogenation[2] while 2-nitrobenzaldehyde is obtained by treatment with ozone respectively.

They are the final precursor, reduced with lithium aluminium hydride to the final product (an amine).

[3] The chemical is produced by either the Henry reaction of benzaldehyde and nitromethane[4][5] or by direct nitration of styrene using nitric oxide.