(E)-4-Bromocrotonic Acid

• CAT Number: R063942
• CAS Number: 13991-36-1
• Molecular Formula: C4H5BrO2
• Molecular Weight: 164.99
• Purity: ≥95%
• Synonyms: (E)-4-Bromobut-2-enoic Acid; trans-4-Bromo-2-butenoic Acid
• Storage: Store at -20°C
• IUPAC Name: (E)-4-bromobut-2-enoic acid
• InChI: InChI=1S/C4H5BrO2/c5-3-1-2-4(6)7/h1-2H,3H2,(H,6,7)/b2-1+
• InChIKey: DOTGZROJTAUYFQ-OWOJBTEDSA-N
• SMILES: C(/C=C/C(=O)O)Br

(E)-4-Bromocrotonic acid（Cat No.:R063942）is a brominated unsaturated carboxylic acid featuring a trans-configured (E) double bond and a bromine atom at the terminal carbon. This compound serves as a reactive intermediate in organic synthesis, particularly in the preparation of heterocycles, pharmaceuticals, and agrochemicals. The conjugated alkene and electron-withdrawing bromine enable selective transformations such as nucleophilic substitution, elimination, and cross-coupling reactions. Its carboxylic acid group allows for esterification or amidation, making (E)-4-bromocrotonic acid a versatile building block for constructing complex molecular architectures in fine chemical research.