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    HomeProductsBasic & Fine ChemicalsFine ChemicalsTosyl Chloride CAS 98‑59‑9
    • Tosyl Chloride CAS 98‑59‑9
    • Tosyl Chloride CAS 98‑59‑9

    Tosyl Chloride CAS 98‑59‑9

    Tosyl chloride, also known as p‑toluenesulfonyl chloride, is an aromatic sulfonyl chloride characterized by a para‑methyl‑substituted benzene ring bearing a sulfonyl chloride functional group. This defined molecular structure classifies it as a specialty aromatic sulfonyl compound within professional chemical supply chains. Tosyl chloride (CAS 98‑59‑9) is handled as a discrete molecular substance in regulated industrial and research environments, where accurate identification, documentation, and compliance are essential.
    The material is supplied with standardized specifications and complete technical documentation, including MSDS, TDS, and COA, supporting traceability and regulatory conformity.

    • CAS: 98-59-9
    • Synonyms: Tosyl chloride, p-Toluenesulfonyl chloride, 4-Methylbenzenesulfonyl chloride, TsCl
    • Einecs: 202-684-8
    • Molecular Formula: C7H7ClO2S
    • Grade: Industrial grade 99%
    • Package: 200kg iron drum or 50kg plastic drum packaging
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    Product Description

    1 Physicochemical properties
    2 Application Areas
    3 Storage conditions
    4 Safety precautions

    Physicochemical properties

    PropertyValue
    Chemical NameTosyl chloride (p-Toluenesulfonyl chloride)
    Molecular FormulaC7H7ClO2S
    Molecular Weight190.65 g/mol
    CAS Number98-59-9
    EINECS Number202-684-8
    AppearanceWhite to yellow crystalline solid or powder
    OdorStimulating odor
    Density1.3 ± 0.1 g/cm³
    Melting Point65-69 °C (lit.)
    Boiling Point265.3 ± 19.0 °C at 760 mmHg
    Flash Point114.3 ± 21.5 °C
    SolubilityInsoluble in water; easily soluble in organic solvents such as benzene, chloroform, and ether
    LogP (Octanol-Water Partition Coefficient)2.45
    Vapor Pressure0.0 ± 0.5 mmHg at 25 °C
    StabilityStable under normal conditions; may decompose upon heating or prolonged exposure to light
    Hazard ClassCorrosive (UN 3261, Class 8)

    Application Areas

    Protection of hydroxyl/amino groups: used for sulfonylation of alcohols, phenols, or amines (to generate sulfonic acid esters or sulfonamides).
    Drug intermediates: synthetic antibiotics, antiviral drugs, etc. (such as sulfonamide drugs).
    Pesticide synthesis: used for the preparation of certain insecticides or herbicides.
    Polymer modification: used as a crosslinking agent or functionalizing reagent.
    Protein modification: used to study protein sulfonylation reactions

    Storage conditions

    Packaging and Sealing: Double layer moisture-proof packaging (inner PE bag+outer iron drum), sealed and stored in the dark, temperature ≤ 25 ℃.
    Environmental requirements: Store in a cool, dry, ventilated place, away from oxidants, strong alkalis, and humid environments (prone to hydrolysis).
    Storage period: It is recommended to use within 6 months and regularly check the sealing

    Safety precautions

    Personal protection: Wear a gas mask during operation
    operation safety
    Ventilation conditions: It must be operated in a fume hood to avoid inhaling vapors or dust.
    Moisture prevention measures: Use as soon as possible after opening, and strictly seal any remaining reagents.
    No open flames: Although not flammable, decomposition may produce toxic gases (such as SO ₂ HCl）。
    Fire protection measures
    Fire extinguishing agent: Use dry powder, carbon dioxide or sand, and do not use water (it reacts violently with water).
    Hazardous products: Toxic gases such as hydrogen chloride (HCl) and sulfur dioxide (SO ₂) are released during a fire.

    FAQ - Technical & Supply Chain

    • Q:

      Does CAS 98‑59‑9 specifically correspond to tosyl chloride?

      A: Yes. CAS 98‑59‑9 is assigned specifically to tosyl chloride (p‑toluenesulfonyl chloride).
    • Q:

      Is this CAS number associated with a mixture or a single compound?

      A: It refers to a single, well‑defined aromatic sulfonyl chloride with a fixed molecular structure.
    Documents

    Documents and Product Support

    For product review and sourcing evaluation, supporting documents can be coordinated according to the product type, inquiry stage, and order requirements.

    • COA for batch-based quality reference
    • TDS for key physical and chemical information
    • SDS / MSDS for handling, storage, and safety reference
    • Packing information for sample, trial, and bulk orders
    • Technical communication based on application and specification requirements
    Quotation

    Information to Confirm Before Quotation

    Clear sourcing information helps reduce specification mismatch and allows a more accurate quotation before sample or bulk order discussion.

    • Product name and CAS number
    • Application or intended end use
    • Required purity, grade, or specification
    • Sample quantity, trial order, or bulk demand
    • Preferred packing form or net weight
    • Destination country or port
    • Required documents or compliance expectations
    Storage & Handling

    Packaging, Storage, and Handling Notes

    Packaging form, storage conditions, shelf life, and shipment arrangements should be confirmed according to the product characteristics, package size, and destination requirements.

    Before order confirmation, buyers are advised to review the corresponding product documents and confirm whether any special storage, labeling, or handling requirements apply.

    Supply Support

    Sample, Bulk Order and Repeat Supply Support

    Support can be arranged for sample discussion, bulk supply planning, packaging confirmation, and routine sourcing communication based on the actual product and order requirements.

    For repeat-use formulations or long-term procurement plans, buyers may discuss specification consistency, packaging preferences, delivery expectations, and document coordination in advance.

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    Tags:

    Organic Synthesis Reagent Sulfonyl Chloride Tosylation Reagent

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