1-Buten-3-yne

CAS 689-97-4

U.S. production volumes are classified as confidential business information.

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Import value, 2024$246M

Import volumeZero

Top sourceCanada 51%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 290129 · basket

EPA reports by year

2023: US production Confidential · Imports Zero
2019: US production 229.1K lb · Imports Zero

These shares come from HS customs code 290129, which covers 108 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

CA 51%CanadaZA 32%South AfricaBR 6%BrazilJP 4%JapanIT 1%Italy

Spain
Ireland
India
United Kingdom
Malaysia
Dominican Republic
Mexico
Switzerland
Australia
South Korea
Turkey
Portugal
Morocco
Guyana
Poland
Netherlands
Belgium
Slovakia
Ukraine

EPA-registered manufacturers (2)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Shell Plc · GB United Kingdom

Shell Petroleum

Why It Matters

Sectors

EnergyCore Chemicals

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

Used in 2 sectors as 1 functional role.

•Intermediate in Petrochemical Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Intermediate in Petroleum Refineries (100%)Processing as a reactant

Chemical Identity

CAS689-97-4

PubChem CID12720

DTXSIDDTXSID4029199

FormulaC4H4

Mol. Weight52.07 g/mol

SMILESC=CC#C

Data Sources

EPA CompTox (DSSTox) · DTXSID4029199Retrieved 2026-04-06
PubChem · compound 12720Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

1-Buten-3-yne (CAS 689-97-4) https://chemicalindependence.com/chemical/689-97-4/ EPA CompTox (DSSTox): DTXSID4029199. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID4029199 PubChem: 12720. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/12720 EPA Chemical Data Reporting: 689-97-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 689-97-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290129 for CAS 689-97-4. Reporting year: 2024. https://usatrade.census.gov/