Chloro(methyl)magnesium

CAS 676-58-4

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

CH₃ClMg74.8 g/mol

no molecular structure to draw

US productionCBI

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

Import value, 2024$537M

Top sourceChina 39%

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 293190 · basket

EPA reports by year

2023: US production Confidential · Imports Confidential
2019: US production 43.6K lb · Imports Zero

These shares come from HS customs code 293190, which covers 378 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 39%ChinaDE 17%GermanyIT 9%ItalyIN 7%IndiaJP 7%Japan

Ireland
Netherlands
Switzerland
Monaco
Ukraine
Spain
Mexico
Poland
Indonesia
Armenia
Israel
Sweden
Australia
Czech Republic
Hungary
Brunei
Hong Kong
Brazil
Thailand
Argentina
Finland
Austria
Latvia

Domestic parents -- activity not disclosed (2)

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

Albemarle

Weylchem Us

Why It Matters

Sectors

HealthCore 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

•Intermediate in All Other Basic Organic Chemical ManufacturingProcessing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS676-58-4

PubChem CID12670

DTXSIDDTXSID7052365

FormulaCH3ClMg

Mol. Weight74.79 g/mol

SMILES[CH3-].[Mg+2].[Cl-]

Data Sources

EPA CompTox (DSSTox) · DTXSID7052365Retrieved 2026-04-06
PubChem · compound 12670Retrieved 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

Chloro(methyl)magnesium (CAS 676-58-4) https://chemicalindependence.com/chemical/676-58-4/ EPA CompTox (DSSTox): DTXSID7052365. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID7052365 PubChem: 12670. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/12670 EPA Chemical Data Reporting: 676-58-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 676-58-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 676-58-4. Reporting year: 2024. https://usatrade.census.gov/