4-Methyl diphenyl sulfide is an aromatic thio-ether in which a methyl group is located para to the sulfur bridge. The compound is air-stable, freely soluble in common organic solvents (dichloromethane, chloroform, ethyl acetate, toluene), and essentially insoluble in water.
Key physicochemical data:
Density: 1.06 g cm⁻³ (20 °C)
Refractive index n²⁰/D: 1.59
Boiling point: 298 °C / 760 mmHg
Flash point: > 110 °C
Log P (octanol/water): 4.5 (predicted)
Typical uses:
High-boiling solvent and heat-transfer fluid for polymer and resin manufacture.
Building block for 4-methyl-diphenyl sulfoxide/sulfone plasticisers and flame retardants.
Internal standard for GC-MS quantitative analysis of methyl-diphenyl sulfide residues.
Quality specification (commercial grade):
Purity (GC): ≥98 %
Water content (KF): ≤0.2 %
Free thiol (as PhSH): ≤0.1 %
Residue on ignition: ≤0.1 %
Heavy metals: ≤20 ppm
Hazard statement:
Causes skin and eye irritation (R36/37/38). Avoid inhalation of vapour; use gloves, goggles and adequate ventilation. SDS available on request.
