CH3OSO2OCH3

CH3OSO2OCH3, commonly known as dimethyl sulfate, is an organosulfur compound with the formula (CH3O)2SO2. It is a dialkyl sulfate in which two methoxy groups are bound to a sulfur center. It is a reactive, colorless liquid at room temperature that readily undergoes hydrolysis in the presence of moisture.

Dimethyl sulfate is a potent methylating agent used in organic synthesis. It transfers a methyl group to a wide range of nucleophiles, including phenols, thiols, and amines, enabling the formation of methyl ethers, thioethers, and other methylated products. The methylation reactions are typically carried out under basic conditions and can be highly efficient but also require careful control due to the reagent’s reactivity.

Preparation and availability: Dimethyl sulfate is produced commercially by established industrial processes that involve methylation of sulfur-containing reagents under controlled conditions. Exact manufacturing methods vary and are typically kept proprietary due to safety considerations. It is sold to research laboratories and chemical manufacturers for use as a methylating agent.

Hazards and safety: Dimethyl sulfate is highly toxic and poses significant health risks through inhalation, ingestion, or skin contact. It is a strong alkylating agent and can methylate biological macromolecules, contributing to mutagenic and carcinogenic concerns. It is corrosive to skin, eyes, and mucous membranes and reacts with water to form methanol and sulfuric acid, limiting storage stability. Handling should be conducted in a well-ventilated fume hood with appropriate personal protective equipment, and storage should be in tightly closed containers, protected from moisture and incompatible materials.

Environmental and regulatory notes: The compound is typically subject to strict handling and disposal requirements in laboratory and industrial settings due to its toxicity and reactivity.