1,2,3,4-Tetrahydroisoquinoline
Also known as: Tetrahydroisoquinoline, 1,2,3,4-Tetrahydro-2-azanaphthalene, 1,2,3,4-Tetrahydro-2-isoquinoline, Isoquinoline, 1,2,3,4-tetrahydro-
1,2,3,4-Tetrahydroisoquinoline (CAS 91-21-4) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C9H11N and a molecular weight of 133.190 g/mol. Key properties include a melting point of −30 °C(lit.), a boiling point of 232.5±9.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 98.9±0.0 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 91-21-4
- Jingsj CID
- J-33066-5
- Molecular Formula
- C9H11N
- Molecular Weight
- 133.190 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | −30 °C(lit.) |
|---|---|
| Boiling Point | 232.5±9.0 °C at 760 mmHg |
| Density | 1.0±0.1 g/cm3 |
| Flash Point | 98.9±0.0 °C |
| Exact Mass | 133.089142 |
| PSA | 12.03000 |
| LogP | 1.40 |
| Vapor Pressure | 0.1±0.5 mmHg at 25°C |
| Refractive Index | 1.544 |
Customs & Trade Information
| HS Code | 2933499090 |
|---|---|
| Summary | 2933499090. other compounds containing in the structure a quinoline or isoquinoline ring-system (whether or not hydrogenated), not further fused. 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 1,2,3,4-Tetrahydroisoquinoline?
The CAS number of 1,2,3,4-Tetrahydroisoquinoline is 91-21-4.
What are the molecular formula and molecular weight of 1,2,3,4-Tetrahydroisoquinoline?
1,2,3,4-Tetrahydroisoquinoline has molecular formula C9H11N and molecular weight 133.190 g/mol.
What are the upstream and downstream products of 1,2,3,4-Tetrahydroisoquinoline?
For 1,2,3,4-Tetrahydroisoquinoline, Upstream Products: Isoquinoline, Isoquinoline N-oxide, Formaldehyde; Downstream Products: 3,4-Dihydroisoquinoline, Isoquinoline, 3,4-Dihydroisoquinolin-1(2H)-one.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "1,2,3,4-Tetrahydroisoquinoline (CAS 91-21-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-33066-5 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.