4-Nitrosophenol

Also known as: p-Nitrosophenol, 1,4-Benzoquinone monoxime, p-Quinone monoxime, Quinone monoxime, 4-Hydroxynitrosobenzene, 1-Nitroso-4-hydroxybenzene, Quinone oxime, Phenol, 4-nitroso-

4-Nitrosophenol (CAS 104-91-6) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C6H5NO2 and a molecular weight of 123.109 g/mol. Key properties include a melting point of 132-144°C, a boiling point of 265.9±23.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 114.6±22.6 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 104-91-6
Jingsj CID: J-44981-6
Molecular Formula: C₆H₅NO₂
Molecular Weight: 123.109 g/mol
Category: Alcohols
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	132-144°C
Boiling Point	265.9±23.0 °C at 760 mmHg
Density	1.2±0.1 g/cm3
Flash Point	114.6±22.6 °C
Exact Mass	123.032028
PSA	49.66000
LogP	1.27
Vapor Pressure	0.0±0.6 mmHg at 25°C
Refractive Index	1.564
Additional Property	<0.1 g/100 mL at 21 ºC

Customs & Trade Information

HS Code	2908999090
Summary	2908999090 halogenated, sulphonated, nitrated or nitrosated derivatives of phenols or phenol-alcohols。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:5.5%。General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 4-Nitrosophenol?

The CAS number of 4-Nitrosophenol is 104-91-6.

What are the molecular formula and molecular weight of 4-Nitrosophenol?

4-Nitrosophenol has molecular formula C6H5NO2 and molecular weight 123.109 g/mol.

What are the upstream and downstream products of 4-Nitrosophenol?

For 4-Nitrosophenol, Upstream Products: Phenol, 4-Aminophenol, Ammonium nitrite; Downstream Products: 4-Bromophenol, 4-Chlorophenol, Hydroquinone.

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. "4-Nitrosophenol (CAS 104-91-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-44981-6 (accessed 2026-11-06).

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