4H-Cyclopenta[2,1-b:3,4-b']dithiophene

Also known as: 3,4-Dithia-7H-cyclopenta[a]pentalene, 4H-Cyclopenta[1,2-b:5,4-b']dithiophene, 4H-Cyclopenta[1,2-b:5,4-b']bisthiophene, 4H-Thieno[3',2':4,5]cyclopenta[1,2-b]thiophene, 4H-Cyclopenta(2,1-b:3,4-b')dithiophene, DTCPP

4H-Cyclopenta[2,1-b:3,4-b']dithiophene (CAS 389-58-2) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H6S2 and a molecular weight of 178.274 g/mol. Key properties include a boiling point of 307.8±22.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 103.1±8.5 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 389-58-2
Jingsj CID: J-7327-8
Molecular Formula: C₉H₆S₂
Molecular Weight: 178.274 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	307.8±22.0 °C at 760 mmHg
Density	1.4±0.1 g/cm3
Flash Point	103.1±8.5 °C
Exact Mass	177.991089
PSA	56.48000
LogP	3.52
Vapor Pressure	0.0±0.6 mmHg at 25°C
Refractive Index	1.725
Storage Conditions	2-8°C

Customs & Trade Information

HS Code	2934999090
Summary	2934999090. other heterocyclic compounds. 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 4H-Cyclopenta[2,1-b:3,4-b']dithiophene?

The CAS number of 4H-Cyclopenta[2,1-b:3,4-b']dithiophene is 389-58-2.

What are the molecular formula and molecular weight of 4H-Cyclopenta[2,1-b:3,4-b']dithiophene?

4H-Cyclopenta[2,1-b:3,4-b']dithiophene has molecular formula C9H6S2 and molecular weight 178.274 g/mol.

What are the upstream and downstream products of 4H-Cyclopenta[2,1-b:3,4-b']dithiophene?

For 4H-Cyclopenta[2,1-b:3,4-b']dithiophene, Upstream Products: 4H-Cyclopenta[2,1-b:3,4-b']dithiophen-4-one, 3-Thiophenecarboxaldehyde; Downstream Products: 2,6-Dibromo-4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b']dithiophene, 2,6-Dibromo-4,4-dioctylcyclopenta[2,1-b:3,4-b']dithiophene.

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. "4H-Cyclopenta[2,1-b:3,4-b']dithiophene (CAS 389-58-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-7327-8 (accessed 2026-11-09).

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