3-Aminothioanisole (3-(methylthio)aniline) is a bifunctional aromatic molecule that combines a primary amino group meta to a methylthio substituent. The material is employed in four main areas:
Pharmaceutical intermediate – Key precursor to the veterinary anthelmintic nitroscanate and to crop-protection actives bearing the 3-methylthio-4-nitro aromatic core.
Agro-chemical building block – Diazotisation followed by Sandmeyer reactions (Cl, Br, CN) delivers fungicides and insecticides.
Dye & pigment chemistry – Undergoes oxidative coupling to give thiazine or phenazine chromophores used in pressure-sensitive and thermal-transfer inks.
Redox-switchable protecting reagent – The amino group can be reversibly converted into an azo or diazonium functionality, allowing mild cleavage of the methylthio moiety in peptide and oligosaccharide synthesis.
Store under nitrogen at 2–8 °C; the liquid is air-sensitive and slowly oxidises to the disulfide. It is harmful if swallowed (quail oral LD₅₀ 750 mg kg⁻¹) and is irritating to skin and eyes; handle with gloves and local exhaust ventilation.
