4-(Methylthio)benzyl alcohol is an aromatic thio-ether primary alcohol in which a methylthio group is located at the para-position of the benzylic alcohol ring. The compound exhibits a faint mercaptan-like odour and is readily soluble in most common organic solvents (dichloromane, ethyl acetate, THF, methanol, ethanol), while its water solubility is limited (≈2 g L⁻¹ at 25 °C).
Physico-chemical data: m.p. 38–42 °C; b.p. 305.6 °C / 760 mmHg; flash point >110 °C; density 1.15 g cm⁻³; refractive index n²⁰/D 1.605 (lit.). The substance is air-stable at ambient temperature but should be protected from strong oxidants and stored under an inert atmosphere if prolonged shelf life is required.
Typical uses:
Versatile building block for the preparation of 4-methylthiobenzyl (MTB) ester protecting groups in peptide and β-lactam antibiotic synthesis; the MTB ester is orthogonal to many acid- and base-labile protecting motifs and can be removed selectively with mild Lewis acids or by two-step oxidation–reduction sequences .
Key intermediate for agro-chemicals, UV-absorbers and liquid-crystalline materials that require a lipophilic benzylthio handle.
Starting material for the synthesis of labelled benzyl mercaptans used in surface-enhanced Raman scattering (SERS) studies.
Storage: Store in a tightly closed container, 2–8 °C, under nitrogen; avoid prolonged exposure to light.
Hazard statement: Causes skin and eye irritation; harmful if swallowed. Use gloves and safety goggles; handle in a fume hood. SDS available on request.
