2,3-Dihydrothieno[3,4-b][1,4]dioxine-5,7-dicarboxylic acid

Also known as: 3,4-Ethylenedioxythiophene-2,5-dicarboxylic acid, 2,5-Dicarboxy-3,4-ethylenedioxythiophene, 3,4-Ethylenedioxythiophene-2,5-dicarboxyllic acid, 2,3-Dihydro-thieno[3,4-b]-p-dioxin-5,7-dicarboxylic acid, Thieno[3,4-b]-1,4-dioxin-5,7-dicarboxylic acid, 2,3-dihydro-

2,3-Dihydrothieno[3,4-b][1,4]dioxine-5,7-dicarboxylic acid (CAS 18361-03-0) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C8H6O6S and a molecular weight of 230.19500 g/mol. Key properties include a boiling point of 482.6ºC at 760 mmHg, a density of 1.732 g/cm3 and a flash point of 245.6ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 18361-03-0
Jingsj CID: J-1378020-6
Molecular Formula: C₈H₆O₆S
Molecular Weight: 230.19500 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	482.6ºC at 760 mmHg
Density	1.732 g/cm3
Flash Point	245.6ºC
Exact Mass	229.98900
PSA	121.30000
LogP	0.91570
Vapor Pressure	4.01E-10mmHg at 25°C
Refractive Index	1.663

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 2,3-Dihydrothieno[3,4-b][1,4]dioxine-5,7-dicarboxylic acid?

The CAS number of 2,3-Dihydrothieno[3,4-b][1,4]dioxine-5,7-dicarboxylic acid is 18361-03-0.

What are the molecular formula and molecular weight of 2,3-Dihydrothieno[3,4-b][1,4]dioxine-5,7-dicarboxylic acid?

2,3-Dihydrothieno[3,4-b][1,4]dioxine-5,7-dicarboxylic acid has molecular formula C8H6O6S and molecular weight 230.19500 g/mol.

What are the upstream and downstream products of 2,3-Dihydrothieno[3,4-b][1,4]dioxine-5,7-dicarboxylic acid?

For 2,3-Dihydrothieno[3,4-b][1,4]dioxine-5,7-dicarboxylic acid, Upstream Products: Diethyl 2,3-dihydrothieno[3,4-b][1,4]dioxine-5,7-dicarboxylate, 1,1-Dichloroethane, Dimethyl 3,4-dihydroxythiophene-2,5-dicarboxylate; Downstream Products: 2,5-Dibromo-3,4-ethylenedioxythiophene, 3,4-Ethylenedioxythiophene.

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. "2,3-Dihydrothieno[3,4-b][1,4]dioxine-5,7-dicarboxylic acid (CAS 18361-03-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1378020-6 (accessed 2026-11-09).

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