1H,3H-Naphtho[1,8-cd]thiopyran

Also known as: 1H,3H-Benzo[de]isothiochromene, 1,3-Dihydro-2-thiaphenalene, 1,3-Dihydro-2-thiophenalene, 2H,6H-naphtho[1,8-cd]thiin

1H,3H-Naphtho[1,8-cd]thiopyran (CAS 203-85-0) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C12H10S and a molecular weight of 186.27300 g/mol. Key properties include a boiling point of 372.4ºC at 760mmHg, a density of 1.224g/cm3 and a flash point of 181.3ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 203-85-0
Jingsj CID: J-1495108-7
Molecular Formula: C₁₂H₁₀S
Molecular Weight: 186.27300 g/mol
Category: Aromatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	372.4ºC at 760mmHg
Density	1.224g/cm3
Flash Point	181.3ºC
Exact Mass	186.05000
PSA	25.30000
LogP	3.58660
Vapor Pressure	2.06E-05mmHg at 25°C
Refractive Index	1.715

Customs & Trade Information

HS Code	2930909090
Summary	2930909090. other organo-sulphur compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 1H,3H-Naphtho[1,8-cd]thiopyran?

The CAS number of 1H,3H-Naphtho[1,8-cd]thiopyran is 203-85-0.

What are the molecular formula and molecular weight of 1H,3H-Naphtho[1,8-cd]thiopyran?

1H,3H-Naphtho[1,8-cd]thiopyran has molecular formula C12H10S and molecular weight 186.27300 g/mol.

What are the upstream and downstream products of 1H,3H-Naphtho[1,8-cd]thiopyran?

For 1H,3H-Naphtho[1,8-cd]thiopyran, Upstream Products: 1,8-bis(bromomethyl)naphthalene, 1,8-Naphthalenedimethanol; Downstream Products: Acenaphthylene.

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. "1H,3H-Naphtho[1,8-cd]thiopyran (CAS 203-85-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1495108-7 (accessed 2026-11-09).

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