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Phosphine, 1,1'-(1,2-ethanediyl)bis[1,1-diphenyl-

CAS 1663-45-2

Molecular structure of 1663-45-2
US productionNot reported
Import value, 2024$598M
Top sourceChina 89%

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 293149 · basket

These shares come from HS customs code 293149, which covers 114 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 89%ChinaIN 4%IndiaCA 3%CanadaDE 2%GermanyAR 1%Argentina

Why It Matters

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

Chemical Identity

CAS1663-45-2
PubChem CIDNot recorded
DTXSIDDTXSID2061858
FormulaC26H24P2
Mol. Weight398.426 g/mol
SMILESC(CP(C1=CC=CC=C1)C1=CC=CC=C1)P(C1=CC=CC=C1)C1=CC=CC=C1

Data Sources

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Brief citations

Phosphine, 1,1'-(1,2-ethanediyl)bis[1,1-diphenyl- (CAS 1663-45-2) https://chemicalindependence.com/chemical/1663-45-2/ EPA TSCA Inventory: CAS 1663-45-2. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 293149 for CAS 1663-45-2. Reporting year: 2024. https://usatrade.census.gov/