T

Thymine

IUPAC: 5-methyl-1H-pyrimidine-2,4-dione

C5H6N2O2 Organic Compounds CAS 65-71-4
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Quick Reference
Formula / NotationC5H6N2O2
CAS Number65-71-4
Molecular Weight126.11
Melting Point316 °C
Solubility3820 mg/L (at 25 °C)
AppearanceSolid; [Merck Index] White crystalline powder; [Alfa Aesar MSDS]
Also Known As5-methyl-1H-pyrimidine-2,4-dione; 65-71-4; 5-methyluracil; 2,4-Dihydroxy-5-methylpyrimidine; Thymin; 5-Methyl-1,2,3,4-tetrahydropyrimidine-2,4-dione; Thymine anhydrate; 2,4(1H,3H)-Pyrimidinedione, 5-methyl-; Thymin (purine base); 5-methyl-2,4(1H,3H)-pyrimidinedione
CategoryOrganic Compounds

What is Thymine?

Thymine is a pyrimidine nucleobase that is uracil in which the hydrogen at position 5 is replaced by a methyl group. It has a role as a mouse metabolite, an Escherichia coli metabolite and a human metabolite. It is a pyrimidine nucleobase and a pyrimidone.

Formula & Notation

C5H6N2O2

IUPAC Name: 5-methyl-1H-pyrimidine-2,4-dione

Other Names / Synonyms: 5-methyl-1H-pyrimidine-2,4-dione; 65-71-4; 5-methyluracil; 2,4-Dihydroxy-5-methylpyrimidine; Thymin; 5-Methyl-1,2,3,4-tetrahydropyrimidine-2,4-dione; Thymine anhydrate; 2,4(1H,3H)-Pyrimidinedione, 5-methyl-; Thymin (purine base); 5-methyl-2,4(1H,3H)-pyrimidinedione

Properties & Characteristics

Appearance: Solid; [Merck Index] White crystalline powder; [Alfa Aesar MSDS]. Molecular formula: C5H6N2O2. Molecular weight: 126.11 g/mol. Melting point: 316 °C. Solubility: 3820 mg/L (at 25 °C). Vapor pressure: 0.00000133 [mmHg]. LogP: -0.6.

Physical Data

PropertyValue
Melting Point316 °C
Molecular Weight126.11
Solubility3820 mg/L (at 25 °C)
AppearanceSolid; [Merck Index] White crystalline powder; [Alfa Aesar MSDS]

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 Thymine
Formula C5H6N2O2
CAS Number 65-71-4
Molecular Weight 126.11
Synonyms 5-methyl-1H-pyrimidine-2,4-dione; 65-71-4; 5-methyluracil; 2,4-Dihydroxy-5-methylpyrimidine; Thymin; 5-Methyl-1,2,3,4-tetrahydropyrimidine-2,4-dione; Thymine anhydrate; 2,4(1H,3H)-Pyrimidinedione, 5-methyl-; Thymin (purine base); 5-methyl-2,4(1H,3H)-pyrimidinedione

Frequently Asked Questions

Thymine is a pyrimidine nucleobase that is uracil in which the hydrogen at position 5 is replaced by a methyl group. It has a role as a mouse metabolite, an Escherichia coli metabolite and a human metabolite. It is a pyrimidine nucleobase and a pyrimidone.

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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.