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Diphenylphosphinous chloride

CAS 1079-66-9

Phosphinous chloride, P,P-diphenyl-

Molecular structure of 1079-66-9
US productionNot reported
Import value, 2024$16M
Top sourceChina 84%

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

Why supply is unknown

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 293159 · basket

These shares come from HS customs code 293159, which covers 10 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 84%ChinaCA 12%CanadaDE 1%GermanyCH 1%SwitzerlandAM 1%Armenia

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS1079-66-9
PubChem CIDNot recorded
DTXSIDDTXSID7038789
FormulaC12H10ClP
Mol. Weight220.64 g/mol
SMILESClP(C1=CC=CC=C1)C1=CC=CC=C1

Data Sources

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Brief citations

Diphenylphosphinous chloride (CAS 1079-66-9) https://chemicalindependence.com/chemical/1079-66-9/ EPA TSCA Inventory: CAS 1079-66-9. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 293159 for CAS 1079-66-9. Reporting year: 2024. https://usatrade.census.gov/