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77-78-1 structure, C2H6O4S
dimethyl sulfate
CAS No.: 77-78-1 Formula: C2H6O4S Molecular Weight: 126.13200
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77-78-1 structure, C2H6O4S

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77-78-1 structure, C2H6O4S

dimethyl sulfate

CAS No.:

77-78-1

 Formula:

C2H6O4S

 Molecular Weight: 126.13200
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Description

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.
Under standard conditions, Me2SO4 is a colourless oily liquid with a slight onion-like odour (although smelling it would represent significant exposure). Like all strong alkylating agents, Me2SO4 is extremely toxic. Its use as a laboratory reagent has been superseded to some extent by methyl triflate, CF3SO3CH3, the methyl ester of trifluoromethanesulfonic acid.

Numbering system

UNII JW5CW40Z50

Properties

Appearance & Physical State

 Clear oily liquid

Density

 1.333

Boiling Point

 188ºC

Melting Point

 -32ºC

Flash Point

 83ºC

Refractive Index

 1.386-1.388

Stability

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

Storage Condition

 2-8ºC

Safety Info

Hazard Class

 6.1(a)

Safety Statements

 S45-S53

HS Code

 2920909090

RIDADR

 UN 1595

Risk Statements

 R25; R26; R34; R43; R45; R68

Hazard Codes

 T+

Signal Word

 Danger

Caution Statement

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

Hazard Declaration

 H301; H314; H317; H330; H341; H350

Symbol

 GHS05, GHS06, GHS08
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Precursor:
diazomethane sulfur trioxide trimethyl arsorite 2-(4-methylphenyl)-2,3-dimethyl-1,3-oxazolidine Trimethyl phosphite Dimethyl ether dimethyl sulfite methyl sulfate Trimethoxymethane Methanol
Product:
6-methoxy-2,5,7,8-tetramethyl-3,4-dihydrochromene-2-carboxylic acid (5R,6S)-5,6-dimethoxycyclohexa-1,3-diene 2-methoxyprop-1-enylbenzene 3-(tert-Butyl)-4-methoxybenzaldehyde 3-phenylbutan-2-one 3-(2-methoxyphenyl)propan-1-ol methyl 2-benzamidobut-2-enoate 1,2,3,4-tetrachloro-5-methylbenzene methyl 2-methylindazole-3-carboxylate 2-(1-methyl-4-nitroimidazol-2-yl)pyridine
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Compound Synonyms: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 1 2 3 4 5 6 7 8 9

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