4,4'-Thiodiphenol

Also known as: Bis(4-hydroxyphenyl) sulfide, 4,4'-Thiobisphenol, 4-(4-hydroxyphenyl)sulfanylphenol, 4-hydroxyphenyl sulphide, p,p'-Dihydroxydiphenyl sulfide, 4,4'-Sulfanediyldiphenol, Thiobisphenol, DFS

4,4'-Thiodiphenol (CAS 2664-63-3) is a compound in the Ethers category listed in the Jingsj chemical database. It has the molecular formula C12H10O2S and a molecular weight of 218.272 g/mol. Key properties include a melting point of 154-156 °C(lit.), a boiling point of 452.7±30.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 219.7±23.3 °C. It is classified under GHS with signal word Danger and hazard statements H314 — Causes severe skin burns and eye damage. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 2664-63-3
Jingsj CID: J-1142229-1
Molecular Formula: C₁₂H₁₀O₂S
Molecular Weight: 218.272 g/mol
Category: Ethers
Last updated: 8/21/2026

Request MSDS / TDS

No offers for this compound yet.

Request a quote

Physicochemical Properties

Melting Point	154-156 °C(lit.)
Boiling Point	452.7±30.0 °C at 760 mmHg
Density	1.4±0.1 g/cm3
Flash Point	219.7±23.3 °C
Exact Mass	218.040146
PSA	65.76000
LogP	3.34
Vapor Pressure	0.0±1.1 mmHg at 25°C
Refractive Index	1.717

GHS Safety & Compliance

CorrosionSignal word: Danger

H314 — Causes severe skin burns and eye damage

Customs & Trade Information

HS Code	29309070

Frequently Asked Questions

What is the CAS number of 4,4'-Thiodiphenol?

The CAS number of 4,4'-Thiodiphenol is 2664-63-3.

What are the molecular formula and molecular weight of 4,4'-Thiodiphenol?

4,4'-Thiodiphenol has molecular formula C12H10O2S and molecular weight 218.272 g/mol.

Is 4,4'-Thiodiphenol hazardous?

4,4'-Thiodiphenol has GHS signal word Danger and hazard statements H314 — Causes severe skin burns and eye damage.

What are the upstream and downstream products of 4,4'-Thiodiphenol?

For 4,4'-Thiodiphenol, Upstream Products: 4,4'-Sulfinyldiphenol, Phenol, 4-Bromophenol; Downstream Products: Bis(4-methoxyphenyl) sulfide, Temephos, 4-Mercaptophenol.

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. "4,4'-Thiodiphenol (CAS 2664-63-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1142229-1 (accessed 2026-11-06).

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