Dimethyl squarate

Modify Date: 2025-08-21 16:00:34

Dimethyl squarate Structure
Dimethyl squarate structure
Common Name Dimethyl squarate
CAS Number 5222-73-1 Molecular Weight 142.109
Density 1.3±0.1 g/cm3 Boiling Point 286.1±50.0 °C at 760 mmHg
Molecular Formula C6H6O4 Melting Point 55-57 °C(lit.)
MSDS Chinese USA Flash Point 128.0±30.2 °C
Symbol GHS08
GHS08
Signal Word Danger

 Names

Name 3,4-Dimethoxy-3-cyclobutene-1,2-dione
Synonym More Synonyms

 Chemical & Physical Properties

Density 1.3±0.1 g/cm3
Boiling Point 286.1±50.0 °C at 760 mmHg
Melting Point 55-57 °C(lit.)
Molecular Formula C6H6O4
Molecular Weight 142.109
Flash Point 128.0±30.2 °C
Exact Mass 142.026611
PSA 52.60000
LogP -1.21
Vapour Pressure 0.0±0.6 mmHg at 25°C
Index of Refraction 1.478
Storage condition 0-6°C

 Safety Information

Symbol GHS08
GHS08
Signal Word Danger
Hazard Statements H317-H334
Precautionary Statements P261-P280-P342 + P311
Personal Protective Equipment dust mask type N95 (US);Eyeshields;Faceshields;Gloves
Hazard Codes Xi
Risk Phrases R42/43
Safety Phrases S22-S24/25-S26-S36/37/39
RIDADR NONH for all modes of transport
WGK Germany 3
HS Code 2914509090

 Synthetic Route

 Customs

HS Code 2914509090
Summary HS:2914509090 other ketones with other oxygen function VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:5.5% General tariff:30.0%

 Articles9

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 Synonyms

Dimethyl squarate
EINECS 220-761-4
3,4-dimethoxycyclobut-3-ene-1,2-dione
3-Cyclobutene-1,2-dione, 3,4-dimethoxy-
MFCD00101316
3,4-Dimethoxy-3-cyclobutene-1,2-dione
Squaric acid dimethyl ester
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