3-Methylisonicotinic acid
Also known as: 3-Methylpyridine-4-carboxylic acid, 3-Methyl-4-pyridinecarboxylic acid, 3-Methyl-isonicotinic acid, 3-Methyl isonicotinic acid, 3-Methyl-4-pyridinylcarboxylic acid, 4-Pyridinecarboxylic acid, 3-methyl-
3-Methylisonicotinic acid (CAS 4021-12-9) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C7H7NO2 and a molecular weight of 137.136 g/mol. Key properties include a melting point of 235ºC, a boiling point of 388.6±22.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 188.8±22.3 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 4021-12-9
- Jingsj CID
- J-46517-8
- Molecular Formula
- C7H7NO2
- Molecular Weight
- 137.136 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 235ºC |
|---|---|
| Boiling Point | 388.6±22.0 °C at 760 mmHg |
| Density | 1.2±0.1 g/cm3 |
| Flash Point | 188.8±22.3 °C |
| Exact Mass | 137.047684 |
| PSA | 50.19000 |
| LogP | 1.00 |
| Vapor Pressure | 0.0±0.9 mmHg at 25°C |
| Refractive Index | 1.561 |
| Storage Conditions | 2-8°C |
Customs & Trade Information
| HS Code | 2933399090 |
|---|---|
| Summary | 2933399090. other compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure. 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 3-Methylisonicotinic acid?
The CAS number of 3-Methylisonicotinic acid is 4021-12-9.
What are the molecular formula and molecular weight of 3-Methylisonicotinic acid?
3-Methylisonicotinic acid has molecular formula C7H7NO2 and molecular weight 137.136 g/mol.
What are the upstream and downstream products of 3-Methylisonicotinic acid?
For 3-Methylisonicotinic acid, Upstream Products: 3,4-Lutidine, 4-Cyano-3-methylpyridine, 4-Chloro-3-methylpyridine; Downstream Products: 3-Methylisonicotinamide, Ethyl 3-methylisonicotinate, Methyl 3-methyl-4-pyridinecarboxylate.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "3-Methylisonicotinic acid (CAS 4021-12-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-46517-8 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.