Description

1-Fluoro-4-(methylthio)benzene (CAS No. 371-15-3) is a high-purity fluorinated aromatic sulfide compound with the molecular formula C₇H₇FS. This organosulfur reagent features a fluorine atom and a methylthio group in the para position, making it a versatile building block for pharmaceutical intermediates, agrochemical synthesis, and materials science applications. Offered as a clear to pale-yellow liquid (or low-melting solid depending on storage conditions), our product is rigorously tested to ensure ≥98% purity (GC) with trace moisture and residual solvent levels controlled to ppm standards. Ideal for nucleophilic aromatic substitution reactions, metal-catalyzed cross-couplings, and as a precursor for sulfoxide/sulfone derivatives. Packaged under inert gas in amber glass bottles with PTFE-lined caps to prevent oxidation and moisture absorption. Technical specifications include: Molecular Weight 142.19 g/mol, Density ~1.18 g/cm³, Boiling Point 198-200°C, and Refractive Index n_D²⁰ 1.556-1.558. SDS and Certificate of Analysis available upon request.

Properties

• CAS Number: 371-15-3
• Complexity: 77
• IUPAC Name: 1-fluoro-4-methylsulfanyl-benzene
• InChI: InChI=1S/C7H7FS/c1-9-7-4-2-6(8)3-5-7/h2-5H,1H3
• InChI Key: XFUMHENRNCUHOH-UHFFFAOYSA-N
• Exact Mass: 142.02524956
• Molecular Formula: C7H7FS
• Molecular Weight: 142.20
• SMILES: CSC1=CC=C(C=C1)F
• Topological: 25.3
• Monoisotopic Mass: 142.02524956
• Synonyms: 371-15-3, 1-Fluoro-4-(methylthio)benzene, 4-Fluorophenyl methyl sulfide, EINECS 206-733-4, DTXSID40190590, DTXCID80113081, 206-733-4, 4-Fluorothioanisole, 1-fluoro-4-methylsulfanylbenzene, 1-fluoro-4-(methylsulfanyl)benzene, MFCD00040829, 4-fluoro-1-methylthiobenzene, 1-fluoro-4-methylsulfanyl-benzene, Benzene, 1-fluoro-4-(methylthio)-, p-fluoro(methylthio)benzene, (4-fluorophenyl)(methyl)sulfane, 4-Fluorothioanisole, 97%, SCHEMBL315214, SCHEMBL315215, CHEMBL2323853, SCHEMBL10517344, SCHEMBL15653904, SBB086252, AKOS006222070, PS-9000, AC-16432, SY049740, DB-049072, CS-0195291, F0566, NS00041463, ST51032146, D90681, EN300-333464

Application

This fluorinated thioether serves as a key intermediate in the synthesis of bioactive molecules, particularly in developing kinase inhibitors and antimicrobial agents. Researchers utilize its para-substitution pattern for creating rigid-rod liquid crystals in advanced display technologies. The compound’s dual functionality allows selective derivatization of either the fluorine (via SNAr) or sulfur moiety (via oxidation/alkylation), enabling efficient scaffold diversification in medicinal chemistry programs.

Safety and Hazards

GHS Hazard Statements

• H315 (100%): Causes skin irritation [Warning Skin corrosion/irritation]
• H319 (100%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
• H335 (89.1%): 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 (100%)
• Eye Irrit. 2 (100%)
• STOT SE 3 (89.1%)

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Disclaimer: Sold exclusively for laboratory research. Prohibited for commercial use, diagnostics, or human/animal applications. Buyers assume all compliance liability.