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

CAS No.: 77-78-1 Formula: C2H6O4S Molecular Weight: 126.13200
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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 Its use as a laboratory reagent has been superseded to some extent by methyl triflate, CF3SO3CH3, the methyl ester of trifluoromethanesulfonic acid.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



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
Risk Statements R25; R26; R34; R43; R45; R68
Hazard Codes T+
Caution Statement P201; P260; P280; P301 + P310 + P330; P303 + P361 + P353; P304 + P340 + P310; P305 + P351 + P338; P308 + P313; P403 + P233
Symbol GHS05, GHS06, GHS08
Hazard Declaration H301; H314; H317; H330; H341; H350
Signal Word Danger
1H NMR : parameter in CDCl3Expand

NMR Spectrum 1H NMR : parameter in CDCl3


C2 H6 O4 S 0.04 ml : 0.5 ml CDCl3
dimethyl sulfate

Parameter ppm Hz
D(A) 3.960

IR : liquid filmExpand
Mass Expand
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