5-methoxy-3H-isobenzofuran-1-one

• CAT Number: L022472
• CAS Number: 4741-62-2
• Molecular Formula: C9H8O3
• Molecular Weight: 164.16
• Purity: ≥95%
• IUPAC Name: 5-methoxy-3H-2-benzofuran-1-one
• InChI: InChI=1S/C9H8O3/c1-11-7-2-3-8-6(4-7)5-12-9(8)10/h2-4H,5H2,1H3
• InChIKey: KLMRELXLQGRFDO-UHFFFAOYSA-N
• SMILES: COC1=CC2=C(C=C1)C(=O)OC2

5-Methoxy-3H-isobenzofuran-1-one（Cat No.:L022472）, also known as 5-methoxyphthalide, is an aromatic lactone with the molecular formula C9H8O3. It features a phthalide core structure, consisting of a benzene ring fused to a lactone ring with a methoxy group (–OCH3) at the 5-position. This compound is of interest in organic synthesis due to its potential as an intermediate for the preparation of bioactive molecules. The methoxy group enhances its solubility and reactivity in electrophilic aromatic substitution reactions. It is typically a pale yellow solid and should be handled with standard laboratory safety precautions.