P

Paracetamol

IUPAC: N-(4-hydroxyphenyl)acetamide

C8H9NO2 Organic Compounds CAS 103-90-2
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Quick Reference
Formula / NotationC8H9NO2
CAS Number103-90-2
Molecular Weight151.16
Melting Point336 to 342 °F (NTP, 1992)
Boiling Point>500
Density1.293 at 70 °F (NTP, 1992) - Denser than water; will sink
Solubility1 to 5 mg/mL at 72 °F (NTP, 1992)
Appearance4-hydroxyacetanilide is an odorless white crystalline solid. Bitter taste. pH (saturated aqueous solution) about 6. (NTP, 1992)
Also Known AsN-(4-hydroxyphenyl)acetamide; acetaminophen; 4-Acetamidophenol; 103-90-2; N-(4-Hydroxyphenyl)acetamide; Tylenol; APAP; 4'-Hydroxyacetanilide; Datril; Panadol
CategoryOrganic Compounds

What is Paracetamol?

Paracetamol is a member of the class of phenols that is 4-aminophenol in which one of the hydrogens attached to the amino group has been replaced by an acetyl group. It has a role as a ferroptosis inducer, a geroprotector, a non-steroidal anti-inflammatory drug, a non-narcotic analgesic, an antipyretic, a xenobiotic, a cyclooxygenase 2 inhibitor, a cyclooxygenase 1 inhibitor, a hepatotoxic agent, a cyclooxygenase 3 inhibitor, an environmental contaminant and a human blood serum metabolite. It is a member of acetamides and a member of phenols. It is functionally related to a 4-aminophenol.

Formula & Notation

C8H9NO2

IUPAC Name: N-(4-hydroxyphenyl)acetamide

Other Names / Synonyms: N-(4-hydroxyphenyl)acetamide; acetaminophen; 4-Acetamidophenol; 103-90-2; N-(4-Hydroxyphenyl)acetamide; Tylenol; APAP; 4'-Hydroxyacetanilide; Datril; Panadol

Properties & Characteristics

Appearance: 4-hydroxyacetanilide is an odorless white crystalline solid. Bitter taste. pH (saturated aqueous solution) about 6. (NTP, 1992). Molecular formula: C8H9NO2. Molecular weight: 151.16 g/mol. Boiling point: >500. Melting point: 336 to 342 °F (NTP, 1992). Density: 1.293 at 70 °F (NTP, 1992) - Denser than water; will sink. Solubility: 1 to 5 mg/mL at 72 °F (NTP, 1992). Vapor pressure: 0.000007 [mmHg]. LogP: 0.5.

Physical Data

PropertyValue
Melting Point336 to 342 °F (NTP, 1992)
Boiling Point>500
Density1.293 at 70 °F (NTP, 1992) - Denser than water; will sink
Molecular Weight151.16
Solubility1 to 5 mg/mL at 72 °F (NTP, 1992)
Appearance4-hydroxyacetanilide is an odorless white crystalline solid. Bitter taste. pH (saturated aqueous solution) about 6. (NTP, 1992)

Uses & Applications

Used as an industrial feedstock, solvent, pharmaceutical intermediate, flavoring agent, or chemical building block.

Safety Information

Flammable or irritant. Many organic compounds are flammable liquids or vapours. Keep away from ignition sources. Consult SDS for specific hazard data.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Paracetamol
Formula C8H9NO2
CAS Number 103-90-2
Molecular Weight 151.16
Synonyms N-(4-hydroxyphenyl)acetamide; acetaminophen; 4-Acetamidophenol; 103-90-2; N-(4-Hydroxyphenyl)acetamide; Tylenol; APAP; 4'-Hydroxyacetanilide; Datril; Panadol

Frequently Asked Questions

Paracetamol is a member of the class of phenols that is 4-aminophenol in which one of the hydrogens attached to the amino group has been replaced by an acetyl group. It has a role as a ferroptosis inducer, a geroprotector, a non-steroidal anti-inflammatory drug, a non-narcotic analgesic, an antipyretic, a xenobiotic, a cyclooxygenase 2 inhibitor, a cyclooxygenase 1 inhibitor, a hepatotoxic agent, a cyclooxygenase 3 inhibitor, an environmental contaminant and a human blood serum metabolite. It is a member of acetamides and a member of phenols. It is functionally related to a 4-aminophenol.

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Editorial standards: Chemical data is sourced from peer-reviewed literature, CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA, and IAEA. For educational purposes only — always consult official SDS documentation and qualified professionals before handling chemicals.