5-tert-butyl-3-isocyanatoisoxazole

Also known as: 5-tert-butyl-3-isoxazolyl isocyanate, 5-(1,1-dimethylethyl)-3-isocyanatoisoxazole, isoxazole, 5-(1,1-dimethylethyl)-3-isocyanato-, 5-(t-butyl)isoxazol-3-yl isocyanate, 5-t-butyl-3-isoxazole isocyanate, 5-t-butylisoxazole-3-isocyanate, 5-tert-butyl-3-isocyanato-1,2-oxazole, 3-isocyanato-5-(2-methyl-2-propanyl)-1,2-oxazole

5-tert-butyl-3-isocyanatoisoxazole (CAS 55809-53-5) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C8H10N2O2 and a molecular weight of 166.177 g/mol. Key properties include a boiling point of 221.4±20.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 87.7±21.8 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 55809-53-5
Jingsj CID: J-1445382-8
Molecular Formula: C₈H₁₀N₂O₂
Molecular Weight: 166.177 g/mol
Category: Organic Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	221.4±20.0 °C at 760 mmHg
Density	1.1±0.1 g/cm3
Flash Point	87.7±21.8 °C
Exact Mass	166.074234
PSA	55.46000
LogP	2.13
Vapor Pressure	0.1±0.4 mmHg at 25°C
Refractive Index	1.520

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 5-tert-butyl-3-isocyanatoisoxazole?

The CAS number of 5-tert-butyl-3-isocyanatoisoxazole is 55809-53-5.

What are the molecular formula and molecular weight of 5-tert-butyl-3-isocyanatoisoxazole?

5-tert-butyl-3-isocyanatoisoxazole has molecular formula C8H10N2O2 and molecular weight 166.177 g/mol.

What are the upstream and downstream products of 5-tert-butyl-3-isocyanatoisoxazole?

For 5-tert-butyl-3-isocyanatoisoxazole, Upstream Products: 3-Amino-5-tert-butylisoxazole, Bis(trichloromethyl) carbonate, Diphosgene; Downstream Products: Isouron.

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-tert-butyl-3-isocyanatoisoxazole (CAS 55809-53-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1445382-8 (accessed 2026-11-09).

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