![Molecular structure of 2,3-dihydrothieno[3,4-b][1,4]dioxine-5-carbaldehyde (CAS 204905-77-1)](/images/chem_structures_svg/321/204905-77-1.svg)
2,3-dihydrothieno[3,4-b][1,4]dioxine-5-carbaldehyde
Also known as: 3,4-ethylenedioxythiophene-2-carbaldehyde, 2,3-dihydrothieno[3,4-b]-1,4-dioxin-5-carbaldehyde, 2-formyl-3,4-ethylenedioxythiophene, thieno[3,4-b]-1,4-dioxin-5-carboxaldehyde, 2,3-dihydro-, 3,4-ethylenedioxothiophene-2-carbaldehyde
2,3-dihydrothieno[3,4-b][1,4]dioxine-5-carbaldehyde (CAS 204905-77-1) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C7H6O3S and a molecular weight of 170.186 g/mol. Key properties include a melting point of 138ºC, a boiling point of 311.2±42.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 142.0±27.9 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 204905-77-1
- Jingsj CID
- J-1055794-5
- Molecular Formula
- C7H6O3S
- Molecular Weight
- 170.186 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 138ºC |
|---|---|
| Boiling Point | 311.2±42.0 °C at 760 mmHg |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 142.0±27.9 °C |
| Exact Mass | 170.003769 |
| PSA | 63.77000 |
| LogP | 0.94 |
| Vapor Pressure | 0.0±0.7 mmHg at 25°C |
| Refractive Index | 1.623 |
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-carbaldehyde?
The CAS number of 2,3-dihydrothieno[3,4-b][1,4]dioxine-5-carbaldehyde is 204905-77-1.
What are the molecular formula and molecular weight of 2,3-dihydrothieno[3,4-b][1,4]dioxine-5-carbaldehyde?
2,3-dihydrothieno[3,4-b][1,4]dioxine-5-carbaldehyde has molecular formula C7H6O3S and molecular weight 170.186 g/mol.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2,3-dihydrothieno[3,4-b][1,4]dioxine-5-carbaldehyde (CAS 204905-77-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1055794-5 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.