8.22002

Crotonic anhydride

(mixture of cis and trans isomers) for synthesis

• Synonym(s): Crotonic anhydride, 2-Butenoic anhydride
• Linear Formula: (CH₃CH=CHCO)₂O
• CAS Number: 623-68-7
• Molecular Weight: 154.16
• UNSPSC Code: 12352106
• EC Index Number: 210-807-1
• NACRES: NA.22

Properties

• vapor pressure: 1 hPa ( 25 °C)
• Quality Level: 200
• form: liquid
• autoignition temp.: 290 °C
• potency: 2061 mg/kg LD₅₀, oral (Rat)
• bp: 250 °C
• mp: -20 °C
• transition temp: flash point 113 °C
• density: 1.04 g/cm³ at 20 °C
• storage temp.: 2-30°C
• SMILES string: O(C(=O)\C=C\C)C(=O)\C=C\C
• InChI: 1S/C8H10O3/c1-3-5-7(9)11-8(10)6-4-2/h3-6H,1-2H3/b5-3+,6-4+
• InChI key: VJDDQSBNUHLBTD-GGWOSOGESA-N

Description

General description

Crotonic anhydride is also known as 2-butenoic anhydride is commonly used as a precursor in the synthesis of polymers. Its reactive anhydride group makes it an effective acylating agent in esterification reactions, facilitating the formation of esters by reacting with alcohols.

Analysis Note

Assay isomers (GC, area%): ≥ 95.5 % (a/a)
Density (d 20 °C/ 4 °C): 1.038 - 1.040
Identity (IR): passes test

Safety Information

• Pictograms: GHS05,GHS09
• Signal Word: Danger
• Hazard Statements: H314 - H400
• Precautionary Statements: P273 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338 - P363
• Hazard Classifications: Aquatic Acute 1 - Eye Dam. 1 - Skin Corr. 1B
• Storage Class Code: 8A - Combustible, corrosive hazardous materials
• WGK: WGK 3
• Flash Point(F): 235.4 °F
• Flash Point(C): 113 °C