Description

p-Fluorophenylacetic acid (CAS No. 405-50-5) is a high-purity fluorinated aromatic carboxylic acid with the molecular formula C₈H₇FO₂. This compound, also known by its IUPAC name 2-(4-fluorophenyl)acetic acid, is a versatile building block in organic synthesis and pharmaceutical research. Its structure features a fluorinated phenyl ring attached to an acetic acid moiety, making it valuable for introducing fluorine into target molecules. Available in >98% purity (HPLC), this white to off-white crystalline powder is rigorously tested for consistency, ensuring optimal performance in sensitive applications. Suitable for use in peptide synthesis, medicinal chemistry, and material science, it is packaged under inert conditions to guarantee stability. Store in a cool, dry place away from light and moisture.

Properties

• CAS Number: 405-50-5
• Complexity: 139
• IUPAC Name: 2-(4-fluorophenyl)acetic acid
• InChI: InChI=1S/C8H7FO2/c9-7-3-1-6(2-4-7)5-8(10)11/h1-4H,5H2,(H,10,11)
• InChI Key: MGKPFALCNDRSQD-UHFFFAOYSA-N
• Exact Mass: 154.04300762
• Molecular Formula: C8H7FO2
• Molecular Weight: 154.14
• SMILES: C1=CC(=CC=C1CC(=O)O)F
• Topological: 37.3
• Monoisotopic Mass: 154.04300762
• Synonyms: 4-FLUOROPHENYLACETIC ACID, 405-50-5, p-Fluorophenylacetic acid, (4-Fluorophenyl)acetic acid, Benzeneacetic acid, 4-fluoro-, 4-Fluorobenzeneacetic acid, Acetic acid, (p-fluorophenyl)-, (p-Fluorophenyl)acetic acid, Ba 2821, S5YJV7CAZ1, NSC 402, NSC-402, EINECS 206-972-4, AI3-52627, DTXSID0059956, FLUOROPHENYLACETIC ACID, P-, P-FLUOROPHENYLACETIC ACID [MI], DTXCID5039771, Acetic acid, (p-fluorophenyl)-(8CI), 2-(4-Fluorophenyl)acetic acid, MFCD00004343, (4-fluoro-phenyl)-acetic acid, 2-(4-fluorophenyl)-acetic acid, UNII-S5YJV7CAZ1, 4-fluorophenyl acetic acid, Maybridge1_006666, p-fluorophenyl acetic acid, 4-fluorophenyl-acetic acid, 4-Fluoro phenylacetic acid, 4-fluoro phenyl acetic acid, 4-fluoro-phenyl-acetic acid, Pipamperone metabolite M-XII, SCHEMBL104746, NSC402, SCHEMBL5950310, SCHEMBL6562633, 4-Fluorophenylacetic acid, 98%, HMS560G22, MGKPFALCNDRSQD-UHFFFAOYSA-, acetic acid, 2-(4-fluorophenyl)-, SBB052671, STK499017, AKOS000119591, BH-0409, CS-W001955, AC-10975, BP-20574, PD119085, SY001347, DB-006819, F0206, NS00015559, ST50824464, EN300-20216, AH-034/32462009, Q27288702, F2191-0056, Z104477312, InChI=1/C8H7FO2/c9-7-3-1-6(2-4-7)5-8(10)11/h1-4H,5H2,(H,10,11)

Application

p-Fluorophenylacetic acid is widely used as a key intermediate in the synthesis of pharmaceuticals, agrochemicals, and specialty chemicals. Its fluorinated aromatic structure makes it valuable for designing bioactive molecules with enhanced metabolic stability and binding affinity. Researchers utilize it in peptide modifications and as a precursor for fluorinated heterocycles. It also serves as a building block in materials science for creating fluorinated polymers with unique properties.

Safety and Hazards

GHS Hazard Statements

• H315 (98%): Causes skin irritation [Warning Skin corrosion/irritation]
• H319 (17.6%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
• H335 (15.7%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]

Precautionary Statements

• P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501

Hazard Classes and Categories

• Skin Irrit. 2 (98%)
• Eye Irrit. 2 (17.6%)
• STOT SE 3 (15.7%)

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