5-Methoxy-1H-indole-2-carbaldehyde

Also known as: 5-Methoxy-1H-indole-2-carboxaldehyde, 5-methoxyindole-2-carboxaldehyde, 5-methoxyindole-2-carbaldehyde, 1H-Indole-2-carboxaldehyde, 5-methoxy-

5-Methoxy-1H-indole-2-carbaldehyde (CAS 21778-81-4) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C10H9NO2 and a molecular weight of 175.184 g/mol. Key properties include a boiling point of 375.2±22.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 180.7±22.3 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 21778-81-4
Jingsj CID: J-1164071-4
Molecular Formula: C₁₀H₉NO₂
Molecular Weight: 175.184 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	375.2±22.0 °C at 760 mmHg
Density	1.3±0.1 g/cm3
Flash Point	180.7±22.3 °C
Exact Mass	175.063324
PSA	42.09000
LogP	1.11
Vapor Pressure	0.0±0.8 mmHg at 25°C
Refractive Index	1.680

Customs & Trade Information

HS Code	2933990090
Summary	2933990090. heterocyclic compounds with nitrogen hetero-atom(s) only. 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 5-Methoxy-1H-indole-2-carbaldehyde?

The CAS number of 5-Methoxy-1H-indole-2-carbaldehyde is 21778-81-4.

What are the molecular formula and molecular weight of 5-Methoxy-1H-indole-2-carbaldehyde?

5-Methoxy-1H-indole-2-carbaldehyde has molecular formula C10H9NO2 and molecular weight 175.184 g/mol.

What are the upstream and downstream products of 5-Methoxy-1H-indole-2-carbaldehyde?

For 5-Methoxy-1H-indole-2-carbaldehyde, Upstream Products: (5-Methoxy-1H-indol-2-yl)methanol, 5-Methoxyindole-2-carboxylic acid, Ethyl 5-methoxy-1H-indole-2-carboxylate; Downstream Products: 5-Methoxyindole.

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. "5-Methoxy-1H-indole-2-carbaldehyde (CAS 21778-81-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1164071-4 (accessed 2026-11-09).

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