4-Methoxyphenol OR MEHQ OR mequinol

4-Methoxyphenol (also known as MEHQ, mequinol, or hydroquinone monomethyl ether) is an organic compound with the chemical formula CH₃OC₆H₄OH. It primarily serves as a crucial polymerization inhibitor in the manufacturing of acrylics and polymers, and as a topical active ingredient in dermatology.

CAS Number: 150-76-5
Appearance: Colorless to white waxy solid or pinkish crystals

Primary Applications
Polymer Stabilizer: Extensively used in the plastics and chemical industries to prevent the unwanted free-radical polymerization of reactive monomers (like acrylic acid and acrylates) during transport, storage, and manufacturing.
Dermatology: Used in topical prescription drugs (often combined with tretinoin) to treat skin depigmentation, age spots, and hyperpigmentation by lightening dark spots.
Chemical Synthesis: Functions as a building block for pharmaceuticals, fine chemicals, and other stabilizers