4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene

Also known as: Xantphos, 9,9-Dimethyl-4,5-bis(diphenylphosphino)xanthene, (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine), (9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphane), 4,5-Bis(diphenylphosphino)-9,9-dimethyl-9H-xanthene, MFCD00233866, 5-(Diphenylphosphino)-9,9-dimethyl-9H-xanthen-4-yl](diphenyl)phosphine

4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene (CAS 161265-03-8) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C39H32OP2 and a molecular weight of 578.618 g/mol. Key properties include a melting point of 224-228 °C(lit.), a boiling point of 665.7±55.0 °C at 760 mmHg and a flash point of 449.9±31.8 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 161265-03-8
Jingsj CID: J-15144-5
Molecular Formula: C₃₉H₃₂OP₂
Molecular Weight: 578.618 g/mol
Category: Aromatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	224-228 °C(lit.)
Boiling Point	665.7±55.0 °C at 760 mmHg
Flash Point	449.9±31.8 °C
Exact Mass	578.192810
PSA	36.41000
LogP	11.90
Vapor Pressure	0.0±1.9 mmHg at 25°C

Customs & Trade Information

HS Code	2932999099
Summary	2932999099. other heterocyclic compounds with oxygen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene?

The CAS number of 4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene is 161265-03-8.

What are the molecular formula and molecular weight of 4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene?

4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene has molecular formula C39H32OP2 and molecular weight 578.618 g/mol.

What are the upstream and downstream products of 4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene?

For 4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene, Upstream Products: 9,9-dimethylxanthene, Chlorodiphenylphosphine; Downstream Products: Phenyl p-tolyl sulfone, Diphenyl sulfone, Dichloro[9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene]palladium(II).

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "4,5-Bis(diphenylphosphino)-9,9-dimethylxanthene (CAS 161265-03-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-15144-5 (accessed 2026-11-06).

Data for reference only; verify product details with suppliers before purchase.