4,4'-Dimethoxy diphenyl sulfide is an aromatic thio-ether in which methoxy groups are located para to the sulfur bridge on both benzene rings. The compound is essentially odourless, air-stable, freely soluble in hot ethanol, ethyl acetate and dichloromethane, and practically insoluble in water.
Key physicochemical data:
Melting point: 124–126 °C (lit.)
Boiling point: 390 °C / 760 mmHg (predicted)
Density: 1.20 g cm⁻³ (25 °C, solid)
Refractive index: 1.639 (70 °C, melt)
Flash point: >200 °C
Log P (octanol/water): 3.9 (predicted)
Typical uses:
High-temperature lubricant additive and antioxidant for polyesters and polycarbonates.
Building block for 4,4'-dimethoxy-diphenyl sulfoxide/sulfone pharmaceutical intermediates and agro-chemicals.
Model electron-rich substrate for mechanistic studies on C–S bond activation and cross-coupling reactions.
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 (H315 + H319). Avoid inhalation of dust; use gloves, goggles and adequate ventilation. Store in a cool, dry place away from oxidants. SDS available on request.
