3-Chloro-2-methylpropene

CAS 563-47-3

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$61M

Top sourceChina 56%

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 290329 · basket

EPA reports by year

2023: US production Confidential · Imports Confidential
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 290329, which covers 39 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).

CN 56%ChinaDE 26%GermanyCZ 9%Czech RepublicMY 3%MalaysiaJP 3%Japan

Mexico
India
South Korea

Domestic parents -- activity not disclosed (1)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Advansix

EPA-registered importers (3)

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

Kcc · KR South Korea

Dow Chemical

Mom Holding

Why It Matters

Sectors

Core 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 All Other Basic Organic Chemical Manufacturing (100%)Processing as a reactant
•Intermediate in All Other Basic Inorganic Chemical Manufacturing (100%)Processing as a reactant

Vendor Pricing

$0.28/gManchester Organics

CountryUnited Kingdom

Pack$14.10 / 50 g

PurityNot recorded

Vendors7 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

6 more vendors

Vendor	Country	$/g	Pack	Purity
ALFA AESAR	Germany	$0.30	1 kg	98%
A2B Chem LLC (1 week)	United States	$0.73	250 g	95%
AA BLOCKS (1 week)	United States	$1.13	250 g	—
Fluorochem UK	United Kingdom	$1.32	50 g	99%
Labotest KG	Germany	$217.80	5000 mg	90%
Otava, Ltd.	Ukraine	$460.00	250 mg	90%

Chemical Identity

CAS563-47-3

PubChem CID11241

DTXSIDDTXSID1020279

FormulaC4H7Cl

Mol. Weight90.55 g/mol

SMILESCC(=C)CCl

Data Sources

EPA CompTox (DSSTox) · DTXSID1020279Retrieved 2026-04-06
PubChem · compound 11241Retrieved 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

3-Chloro-2-methylpropene (CAS 563-47-3) https://chemicalindependence.com/chemical/563-47-3/ EPA CompTox (DSSTox): DTXSID1020279. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID1020279 PubChem: 11241. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/11241 EPA Chemical Data Reporting: 563-47-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 563-47-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290329 for CAS 563-47-3. Reporting year: 2024. https://usatrade.census.gov/