4-Bromothioanisole is a para-substituted aromatic thio-ether that combines an electron-donating methyl-sulfide unit with an aryl bromide handle. This electronic push–pull arrangement makes the C–Br bond highly reactive toward:
Regioselective Suzuki, Heck and Buchwald–Hartwig cross-couplings that deliver para-substituted bi-aryl sulfides, sulfoxides or sulfones under mild conditions (dioxane, 50–110 °C);
Catalyst-free UVA-induced sulfoxidation protocols that give essentially enantio-pure (S)-sulfoxides when combined with engineered Baeyer–Villiger mono-oxygenases;
Directed ortho-metalation (DoM) chemistry using TMP-Zn or TMP-Mg bases, enabling one-pot access to multi-substituted benzene rings;
Selective S-oxidation to the corresponding sulfoxide or sulfone (H₂O₂/AcOH, rt, 1 h, 95 % yield) for agro-chemical and fragrance applications.
The compound is stable for ≥ 24 months when stored sealed, dry and at ambient temperature; it exhibits low vapour pressure (bp 128–130 °C @ 10 mmHg, flash point 113 °C) and is classified as an irritant with a pronounced odour (Xn, Xi, R22-36/37/38, UN 3335) . Commercial lots are supplied under nitrogen with batch-specific COA, GC-MS, NMR and MSDS documentation suitable for cGMP or ISO-9001 workflows.
