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Dimethyl sulfate

Dimethyl sulfate structure

CAS No:
77-78-1
Formula:
C2H6O4S
Chemical Name:
Dimethyl sulfate
Synonyms:
Sulfuric acid,dimethyl ester;Dimethyl sulfate;Methyl sulfate;Dimethyl sulphate;NSC 56194;98478-67-2;139443-72-4;62086-97-9
Categories:
Organic Chemistry > Inorganic Acid Esters

Description

Dimethyl sulfate is a colorless, oily liquid that is slightly soluble in water. It has a faint, onion-like odor; the odor threshold has not been established. The vapor pressure for dimethyl sulfate is 0.5 mm Hg at 20 °C, and it has a log octanol/water partition coefficient (log Kow ) of 0.032. Dimethyl sulfate is essentially odorless. The specific gravity of this colorless, corrosive, oily liquid is 1.3322 g/cm3. Dimethyl sulfate is soluble in ether, dioxane, acetone, benzene, and other aromati

Dimethyl sulfate is a chemical compound with formula (CH3O)2SO2. As the diester of methanol and sulfuric acid, its formula is often written as (CH3)2SO4 or even Me2SO4, where CH3 or Me is methyl. Me2SO4 is mainly used as a methylating agent in organic synthesis.

Dimethyl sulfate Basic Attributes

Molecular Weight：

126.13200

Exact Mass：

126.13

EC Number：

201-058-1

HScode：

2920909090

Characteristics

PSA：

60.98000

XLogP3：

0.60480

Appearance：

Dimethyl sulfate is a colorless oily liquid, odorless to a faint onion-like odor. It is very toxic by inhalation. It is a combustible liquid and has a flash point of 182°F. It is slightly soluble in water and decomposed by water to give sulfuric acid with evolution of heat. It is corrosive to metals and tissue. It is a potent methylating agent.

Density：

1.3322 g/cm³ @ Temp: 20 °C

Melting Point：

-27 °C

Boiling Point：

187.5 °C @ Press: 769 Torr

Flash Point：

83ºC

Refractive Index：

1.386-1.388

Water Solubility：

ethanol: 0.26 g/mL, clear, colorless | 2.8 g/100 mL (18 ºC)

Storage Conditions：

2-8ºC

Vapor Pressure：

Vapour pressure, Pa at 20°C: 65

Vapor Density：

Relative vapour density (air = 1): 4.4

Toxicity：

LD50 orally in rats: 440 mg/kg (Smyth)

Flammability characteristics：

Class IIIA Combustible Liquid: Fl.P. at or above 140°F and below 200°F.

Explosive limit：

vol% in air: 3.63.3

Odor：

Essentially odorless

Safety Information

Packing level：

Hazard category：

6.1(a)

Transport codes：

UN 1595

wgk germany：

hazard class code：

R25; R26; R34; R43; R45; R68

safety instructions：

S45-S53

RTECS Number：

WS8225000

Marks：

T+

Storage features：

Separated from food and feedstuffs and incompatible materials. See Chemical Dangers. Cool. Dry. Well closed. Ventilation along the floor. Store in an area without drain or sewer access.

Stability/Shelf Life：

Stable; combustible. Incompatible with strong oxidizing agents, strong bases including ammonia. Moisture-sensitive.

Precautionary statement(s)：

P201-P260-P280-P301 + P310 + P330-P303 + P361 + P353-P304 + P340 + P310-P305 + P351 + P338-P308 + P313-P403 + P233

Hazard Statements：

H301-H314-H317-H330-H341-H350

RIDADR：

UN 1595

Caution Statement：

P201; P260; P280; P301 + P310 + P330; P303 + P361 + P353; P304 + P340 + P310; P305 + P351 + P338; P308 + P313; P403 + P233

Dimethyl sulfate Use and Manufacturing

Dimethyl Sulfate is a diester of methanol and sulfuric acid. Dimethyl Sulfate is commonly used as a reagent for the methylation of phenols, amines, and thiols. Dimethyl Sulfate is an effective and widely used probe for sequence-specific protein-DNA interactions

Computed Properties

Molecular Weight:126.13
XLogP3:-0.3
Hydrogen Bond Acceptor Count:4
Rotatable Bond Count:2
Exact Mass:125.99867984
Monoisotopic Mass:125.99867984
Topological Polar Surface Area:61
Heavy Atom Count:7
Complexity:107
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes

Synthesis Route

10506-59-9

49829-22-3

76443-13-5

76443-14-6

6106-12-3

Material

Methyl ether

Trimethyl orthoformate

Methanol

Sulfuric acid

Chlorosulfonic acid

Downstream Products

Hydroxylamine hydrochloride

Price Analysis

Make your Dimethyl sulfate purchase based on the price and market insights! ECHEMI provides professional market insights with prices for you to make a better choice. Learn more on Dimethyl sulfate prices .

Data: 2026-07-11
Price: 6200.00Yuan/mt
Change: 300.0

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