4-Methylbenzyl isocyanate
Also known as: 1-(isocyanatomethyl)-4-methylbenzene, p-Methylbenzyl isocyanate, Benzene, 1-isocyanatomethyl-4-methyl-, MFCD00673060, 4-Methylbenzyl isocyanide, DTXSID00369886
4-Methylbenzyl isocyanate (CAS 56651-57-1) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C9H9NO and a molecular weight of 147.17400 g/mol. Key properties include a boiling point of 55 °C0.5 mm Hg(lit.), a density of 1.052 g/mL at 25 °C(lit.) and a flash point of 101.7 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H312 — Harmful in contact with skin and H315 — Causes skin irritation. No supplier offers are currently listed; request a quote. Record last updated Nov 2, 2026.
- CAS No.
- 56651-57-1
- Jingsj CID
- J-33972-0
- Molecular Formula
- C9H9NO
- Molecular Weight
- 147.17400 g/mol
- Category
- Organic Acids
- Last updated
- 11/2/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 55 °C0.5 mm Hg(lit.) |
|---|---|
| Density | 1.052 g/mL at 25 °C(lit.) |
| Flash Point | 101.7 °C |
| Exact Mass | 147.06800 |
| PSA | 29.43000 |
| LogP | 1.83080 |
| Refractive Index | n20/D 1.522(lit.) |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H312 — Harmful in contact with skin
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H332 — Harmful if inhaled
- H334 — May cause allergy or asthma symptoms if inhaled
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2929109000 |
|---|---|
| Summary | 2929109000. other isocyanates. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 4-Methylbenzyl isocyanate?
The CAS number of 4-Methylbenzyl isocyanate is 56651-57-1.
What are the molecular formula and molecular weight of 4-Methylbenzyl isocyanate?
4-Methylbenzyl isocyanate has molecular formula C9H9NO and molecular weight 147.17400 g/mol.
Is 4-Methylbenzyl isocyanate hazardous?
4-Methylbenzyl isocyanate has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H312 — Harmful in contact with skin; H315 — Causes skin irritation.
What are the upstream and downstream products of 4-Methylbenzyl isocyanate?
For 4-Methylbenzyl isocyanate, Upstream Products: 1,1'-Carbonyldiimidazole, 4-Methylbenzylamine, 2-(4-Methylphenyl)acetyl chloride.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "4-Methylbenzyl isocyanate (CAS 56651-57-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-33972-0 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.