Thiophenol is an organosulfur compound with the formula C6H5SH, sometimes abbreviated as PhSH. This foul-smelling colorless liquid is the simplest aromatic thiol. The chemical structures of thiophenol and its derivatives are analogous to phenols except the oxygen atom in the hydroxyl group (-OH) bonded to the aromatic ring is replaced by a sulfur atom. The prefix thio- implies a sulfur-containing compound and when used before a root word name for a compound which would normally contain an oxygen atom, in the case of thiol that the alcohol oxygen atom is replaced by a sulfur atom.
| Appearance | Colorless liquid |
| Odor | Unpleasant, pungent |
| Density | 1.0766 g/mL |
| Melting point | −15 °C (5 °F; 258 K) |
| Boiling point | 169 °C (336 °F; 442 K) |
| Solubility in water | 0.08%[2] |
| Solubility | Most organic solvents; aqueous base |
| Vapor pressure | 1 mmHg (18°C)[2] |
| Acidity (pKa) | 6.62 (H2O) 10.28 (DMSO) |
| Magnetic susceptibility (χ) | -70.8·10−6 cm3/mol |
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