Searching, Assessment, and Screening system for safer alternative chemicals

Searching, assessment, and screening system for safer alternative chemicals, GreenN (Green Next)

    e.g.

    but-1-ene [1]butene, mixed-1-and-2-isomers [2]2-methylpropene [3](Z)-but-2-ene [4](E)-but-2-ene [5]

    Chemical structure of PubChem CID 5287573

    Risk Level Help

    Chemical Substance Information

    • PubChem CID: 5287573
    • CAS: 590-18-1
    • UN NO: 1012
    • Safety Data Sheet: Link
    • SMILES: C/C=C\C

    Hazard Assessment Overview Help

    Hazard Sunburst Chart Legend

    Hazard Assessment Summary Table Help CSV format XLSX format
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    Assessment Type Carcinogenicity Mutagenicity Reproductive Toxicity Developmental Toxicity Endocrine Disruption
    Hazard Assessment Level
    Insufficient data
    for classification
    High
    Insufficient data
    for classification
    Insufficient data
    for classification
    Insufficient data
    for classification
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    Assessment Type Acute Toxicity Systemic Toxicity - Single Dose Systemic Toxicity - Repeated Dose Neurotoxicity - Single Dose Skin Sensitization Respiratory Sensitization Skin Irritation Eye Irritation
    Hazard Assessment Level
    Insufficient data
    for classification
    Insufficient data
    for classification
    Insufficient data
    for classification
    Insufficient data
    for classification
    Insufficient data
    for classification
    Insufficient data
    for classification
    Insufficient data
    for classification
    Insufficient data
    for classification
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    Assessment Type Acute Aquatic Toxicity Chronic Aquatic Toxicity
    Hazard Assessment Level
    Insufficient data
    for classification
    Insufficient data
    for classification
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    Assessment Type Persistence Bioaccumulation
    Hazard Assessment Level
    Insufficient data
    for classification
    Insufficient data
    for classification
    Assessment Type Reactivity Flammability
    Hazard Assessment Level
    Insufficient data
    for classification
    Insufficient data
    for classification
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    Hazard Diagnostic Modules

    The Hazard Diagnostic Module consists of the following four computational chemistry methods. The predicted toxicity alerts are for reference only and should be evaluated together with other available data.

    1. Substructure Alerts
    2. Similarity Alerts
    3. Read-Across
    4. Classification Models

    SMARTS Pattern Endpoint Source Author Journal Reference
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    Physical and Chemical Properties

    Property Value Source
    Boiling Point 3.73 °C
    As reported: 3.73 °C at 760 mm Hg /cis-2-Butene/
    Other sources (3)
    • 3.72 °C — Hazardous Substances Data Bank (HSDB)
    • 3.7 °C — ILO-WHO International Chemical Safety Cards (ICSCs)
    • 3.7 °C (3.7 °C @760 [mm Hg]) — PAC Chemical Database, U.S. Department of Energy
    		Hazardous Substances Data Bank (HSDB)
    Melting Point -139.3 °C
    As reported: -139.3 °C /cis-2-Butene/
    Other sources (3)
    • -138.89 °C — Hazardous Substances Data Bank (HSDB)
    • -138.7 °C — ILO-WHO International Chemical Safety Cards (ICSCs)
    • -138.9 °C — PAC Chemical Database, U.S. Department of Energy
    		Hazardous Substances Data Bank (HSDB)
    Flash Point -11.99 °C
    As reported: -11.99 °C (10.42 °F) - closed cup
    Other sources (1)
    • Flammable gas — ILO-WHO International Chemical Safety Cards (ICSCs)
    		Hazardous Substances Data Bank (HSDB)
    Vapor Pressure 213.315 kPa
    As reported: 1600 mm Hg at 25 °C /cis-2-Butene/
    Other sources (5)
    • 187.984 kPa (Vapor pressure: 1410 mm Hg at 21 °C) — Hazardous Substances Data Bank (HSDB)
    • 181.318 kPa (Vapor pressure = 1360 mm Hg at 20 °C) — Hazardous Substances Data Bank (HSDB)
    • 213.315 kPa (1600 [mm Hg] @25 °C) — PAC Chemical Database, U.S. Department of Energy
    • 1,600 mm Hg at 25 °C — Hazardous Substances Data Bank (HSDB)
    • Vapor pressure, kPa at 21 °C: 181 — ILO-WHO International Chemical Safety Cards (ICSCs)
    		Hazardous Substances Data Bank (HSDB)
    Solubility 658 mg·L⁻¹
    As reported: In water, 658 mg/L at 25 °C
    Other sources (5)
    • Very soluble in ethanol and ether. Soluble in benzene. /cis- and trans-2-Butene/ — Hazardous Substances Data Bank (HSDB)
    • Insoluble in water — Hazardous Substances Data Bank (HSDB)
    • Soluble in most organic solvents — Hazardous Substances Data Bank (HSDB)
    • Soluble in benzene; very soluble in alcohol, ether — Hazardous Substances Data Bank (HSDB)
    • Solubility in water, mg/l at 25 °C: 658 (very slightly soluble) — ILO-WHO International Chemical Safety Cards (ICSCs)
    		Hazardous Substances Data Bank (HSDB)
    Density 0.616 g·cm⁻³
    As reported: 0.616 g/cu cm at 25 °C
    Other sources (2)
    • Density (at the boiling point of the liquid): 0.6 kg/l — ILO-WHO International Chemical Safety Cards (ICSCs)
    • 0.616 @25 °C — PAC Chemical Database, U.S. Department of Energy
    		Hazardous Substances Data Bank (HSDB)
    Partition Coefficient (LogP) 1.85
    As reported: log Kow = 1.85 (mixture of 70% cis- and 30% trans-2-Butene)
    Other sources (2)
    • 2.33 (log Kow = 2.33) — Hazardous Substances Data Bank (HSDB)
    • 2.33 — ILO-WHO International Chemical Safety Cards (ICSCs)
    		Hazardous Substances Data Bank (HSDB)

    Source: PubChem

    Safer Alternatives

    Safer alternatives are referenced from current safer chemical databases and software logic, divided into the following three categories:

    1. The system compiles industrial uses of chemicals from the US EPA ChemView database and integrates them with the US EPA Safer Chemical Ingredients to create a safer alternatives list for each chemical. Chemicals may have multiple industrial uses, so the system uses an accordion-style display. Click the 'Suggested Safer Alternatives' tab to expand the table. If the use is broad (e.g., 'Commercial use'), the list may include more specific uses (e.g., 'Solvent'). If no information is available, refer to 'By Industrial Use (Full List)' for manual filtering.
    2. Categorized by industrial use (full list). This list contains safer chemicals for industrial uses, not necessarily replacements for the chemical on this page. You may filter by industrial use via the search bar at the top right of this tab, e.g., filter by 'Antioxidants'. Source: Safer Chemical Ingredients List
    3. Categorized by structural similarity, requiring:
      • Find chemicals with similar functional groups based on structural similarity (Tanimoto coefficient ≥ 0.8), likely having similar functions.
      • Chemicals identified as lower risk by risk assessment, such as level 3, level 4, or insufficient data.
      Practical substitution feasibility still requires domain knowledge and reference to physicochemical properties. For insufficient data (U), it means current hazard and risk assessment information is limited; thus, selection should be cautious and toxicology studies should be reviewed.
    4. Based on real-world case studies. Source: OECD SAAT

    Based on substructure, the system lists chemicals with risk levels 3 (usable but safer alternatives may be sought), 4 (safer chemicals), or insufficient data (U: not enough data to determine risk level). Information

    Download: SCIL (CSV) SCIL (XLSX) ZeroPM PFAS (CSV) ZeroPM PFAS (XLSX) SUBSPORT+ case alternatives (CSV) SUBSPORT+ case alternatives (XLSX)
    Name CAS Industrial Use Safety Notes
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    This chemical is not listed in the ZeroPM PFAS alternative assessment database.
    OECD SAAT alternative case studies

    Full list of OECD SAAT case studies (not filtered by chemical).

    Case Study Name Link Publish Date Publishing Organization Related Products Description

    Contents

    1. Risk Level
    2. Chemical Substance Information
    3. Hazard Assessment Overview
    4. Hazard Assessment Summary Table
    5. Hazard Diagnostic Modules
    6. Safer Alternatives