(E)-2-Butenoyl chloride
- CAS NO.：625-35-4
- Empirical Formula: C4H5ClO
- Molecular Weight: 104.53
- MDL number: MFCD00000734
- EINECS: 234-010-3
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-01-13 11:16:25
What is (E)-2-Butenoyl chloride?
Chemical properties
clear colourless to brown liquid
The Uses of (E)-2-Butenoyl chloride
Crotonyl chloride is used in agrochemical, pharmaceutical and dyestuff field. Crotonoyl chloride was used in the synthesis of α,β-unsaturated ester.
Purification Methods
If the IR of a film has no OH bands, then fractionally distil it, taking the middle fraction and redistilling it. If OH bands are present, then add excess of oxalyl chloride, reflux for 3hours, then distil off the reagent and fractionally distil the crotonoyl chloride as before. Stabilise the distillate with 160ppm of hydroquinone. The amide forms needles m 158o from aqueous ammonia, and the anilide also forms needles but with m 115-118o from H2O. [Beilstein 2 H 411, 2 I 188, 2 II 392, 2 III 1265, 2 IV 1506.]
Properties of (E)-2-Butenoyl chloride
| Melting point: | 72-74 °C |
| Boiling point: | 120-123 °C(lit.) |
| Density | 1.091 g/mL at 25 °C(lit.) |
| refractive index | n |
| Flash point: | 95 °F |
| storage temp. | 2-8°C |
| form | Liquid |
| color | Clear colorless to brown |
| Water Solubility | Reacts with water. |
| Sensitive | Moisture Sensitive |
| BRN | 506118 |
| CAS DataBase Reference | 625-35-4(CAS DataBase Reference) |
| NIST Chemistry Reference | 2-Butenoyl chloride, (E)-(625-35-4) |
Safety information for (E)-2-Butenoyl chloride
| Signal word | Danger |
| Pictogram(s) |
 Flame Flammables GHS02  Corrosion Corrosives GHS05  Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H226:Flammable liquids H314:Skin corrosion/irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233:Keep container tightly closed. P240:Ground/bond container and receiving equipment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for (E)-2-Butenoyl chloride
| InChIKey | RJUIDDKTATZJFE-NSCUHMNNSA-N |
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