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    1H-Pyrazol-3(2H)-one, CAS 137-45-1, is in stock from AChemBlock as a research-use alcohol / hydroxyl building block.
    Chemical structure of 1H-Pyrazol-3(2H)-one , CAS 137-45-1, AChemBlock K16200

    1H-Pyrazol-3(2H)-one

    Catalog ID: K16200

    Product Name: 1H-Pyrazol-3(2H)-one
    CAS: 137-45-1
    MDL: MFCD00629300
    Purity: 95%
    Appearance: yellow solid
    FW: 84.08
    Formula: C₃H₄N₂O
    Smiles: O=C1C=CNN1
    1H-Pyrazol-3(2H)-one 95%, CAS#: 137-45-1, Cat ID: K16200, BUILDING BLOCKS, AChemBlock
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    For research use only. We do not sell to patients
    Grouped product items
    Packaging List Price Qty Total Total_Price($) Availability Estimated Ship Time
    Packaging:5G List Price: $12 Quantity:
    		Total:-- Total_Price($):-- Availability: In Stock San Francisco Estimated Ship Time:

    Aug 10,2026

    Packaging:25G List Price: $50 Quantity:
    		Total:-- Total_Price($):-- Availability: In Stock San Francisco Estimated Ship Time:

    Aug 10,2026

    Packaging:100G List Price: $190 Quantity:
    		Total:-- Total_Price($):-- Availability: In Stock San Francisco Estimated Ship Time:

    Aug 10,2026

    update on 08-09-2026

    You can click the buttons of HNMR, HPLC, or CoA to view the documents.

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    Safety Information
    Safety Information
    Pictograms GHS07
    Signal Word Warning
    Hazard Statements Causes skin irritation
    Causes serious eye irritation
    May cause respiratory irritation
    Precautionary Statements Avoid breathing dust/fume/gas/mist/vapours/spray.
    Product Information
    Product Information
    Product Information
    Purity 95%
    Appearances yellow solid
    Storage Store at 0-8 °C
    Shipping Room Temp
    MSDS Download MSDS
    IUPAC Name 1,2-dihydro-3h-pyrazol-3-one
    HTS Code 29339982
    Smiles O=C1C=CNN1
    InChiKey XBYRMPXUBGMOJC-UHFFFAOYSA-N
    Product Description 1H-Pyrazol-3(2H)-one (CAS 137-45-1, Catalog ID K16200) is in stock from AChemBlock. This product is listed for research use and can support medicinal chemistry, organic synthesis, and laboratory research applications. Please contact AChemBlock for quotation, pack size, purity, COA, SDS, and lead-time information.
    Product Application Used as a research-use intermediate for organic synthesis and medicinal chemistry research.
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