Description

(E)-4-chlorobut-2-enoic acid (CAS: 26340-58-9) is a high-purity chlorinated unsaturated carboxylic acid with the molecular formula C₄H₅ClO₂. This compound, also known as gamma-chlorocrotonic acid, is a versatile intermediate in organic synthesis and pharmaceutical research. Its trans-configuration ensures consistent reactivity, making it ideal for applications in cross-coupling reactions, polymer chemistry, and bioactive molecule development. With a purity grade of ≥98%, this product is rigorously tested via HPLC, GC, and NMR to meet the stringent requirements of researchers and industrial scientists. Packaged under inert conditions to ensure stability, it is available in quantities ranging from grams to kilograms for laboratory and bulk use.

Properties

• CAS Number: 26340-58-9
• Complexity: 87.7
• IUPAC Name: (E)-4-chlorobut-2-enoic acid
• InChI: InChI=1S/C4H5ClO2/c5-3-1-2-4(6)7/h1-2H,3H2,(H,6,7)/b2-1+
• InChI Key: TVOMCUWVZVBDBG-OWOJBTEDSA-N
• Exact Mass: 119.9978071
• Molecular Formula: C4H5ClO2
• Molecular Weight: 120.53
• SMILES: C(/C=C/C(=O)O)Cl
• Topological: 37.3
• Monoisotopic Mass: 119.9978071
• Synonyms: (E)-4-chlorobut-2-enoic acid, 16197-90-3, GAMMA-CHLOROCROTONIC ACID, 26340-58-9, 4-CHLOROCROTONIC ACID, 4-Chlorobut-2-enoic acid, 2-Butenoic acid, 4-chloro-, (2E)-4-chlorobut-2-enoic acid, MFCD19228094, (E)-4-chloro-2-butenoic acid, 4-Chlorobut-2-enoicacid, trans-4-chlorocrotonic acid, AMMA-CHLOROCROTONICACID, 4-?Chloro-?2-?butenoic acid, SCHEMBL2807332, AKOS006377027, AS-30049, DB-198319, CS-0139553, G61010

(E)-4-chlorobut-2-enoic acid is widely used as a key synthon in the preparation of pharmaceuticals, agrochemicals, and specialty polymers. Its reactive chlorine and carboxyl groups enable facile derivatization for drug discovery, particularly in the synthesis of anti-inflammatory and antimicrobial agents. In material science, it serves as a monomer or crosslinker for functionalized polymers. Researchers also employ it in catalytic studies due to its unsaturated backbone, which participates in selective hydrogenation and cycloaddition reactions.

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