Crotonic acid
CAS 3724-65-0
EC 223-077-4
Formula C4H6O2
MW 86.09 g/mol
Organic Acids Food & NutritionPlastics & PolymersAgriculture & FeedPharmaceuticals & Healthcare Flavoring & AcidulantPolymerization Initiation
Description
Crotonic acid (CAS 3724-65-0, EC 223-077-4, C4H6O2), also known as 2-butenoic acid, alpha-butenoic acid, and FEMA 3908, is a short-chain unsaturated organic acid. It does not carry an E-code designation and is distinct from its geometric isomer, isocrotonic acid.
In polymer chemistry, crotonic acid functions as a reactive monomer and chain-transfer agent, incorporating carboxylic functionality into vinyl and acrylic copolymer systems to modify adhesion and film-forming properties. In food and flavor applications, it serves as a flavoring agent under FEMA 3908, contributing characteristic acidic and pungent notes at controlled concentrations.
Crotonic acid is available in solid technical and food-grade forms, with supply compliant with REACH registration requirements for the European market. FCC-grade material is available for flavor applications. It may also be sourced as a molten liquid for bulk industrial handling.
In polymer chemistry, crotonic acid functions as a reactive monomer and chain-transfer agent, incorporating carboxylic functionality into vinyl and acrylic copolymer systems to modify adhesion and film-forming properties. In food and flavor applications, it serves as a flavoring agent under FEMA 3908, contributing characteristic acidic and pungent notes at controlled concentrations.
Crotonic acid is available in solid technical and food-grade forms, with supply compliant with REACH registration requirements for the European market. FCC-grade material is available for flavor applications. It may also be sourced as a molten liquid for bulk industrial handling.
Physical Properties
| Melting Point | 72 °C |
| Boiling Point | 185 °C |
| Density | 1.018 g/cm³ @ Temp: 15 °C |
| Flash Point | 190 °F |
| Appearance | Crotonic acid is a white or colorless, crystalline solid with a pungent odor. May be transported as a molten liquid. |
| Odor | at 0.10 % in propylene glycol. roasted burnt |
| Water Solubility | soluble |
| Vapor Pressure | 0.19 mm Hg ( 20 °C) |
| Refractive Index | 1.4210 (estimate) |
| Log P | 0.720 |
Safety & Handling (Learn More)
Danger GHS05 GHS07 GHS06
H
H302H311H312H314H315H318H319H335
P
P260P261P262P264P270P271P280P316P317P319P321P330P363P405P501P264+P265P301+P317P302+P352P304+P340P332+P317P337+P317P361+P364P362+P364P403+P233P301+P330+P331P302+P361+P354P305+P351+P338P305+P354+P338
Trade & Regulatory
| UN Number | 2823 |
| ADR Class | 8 |
| Packing Group | III |
| Storage Class | 8A - Combustible corrosive hazardous materials |
| WGK (Germany) | 3 |
Other Names
(E)-but-2-enoic acidCTA2-butenic acid2-butenoic acidAlpha-Butenoic AcidBUTENOIC ACIDα-Butenoic acid
Related Products
Raw Materials
Derivatives
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