L

L-Threonine

IUPAC: (2S,3R)-2-amino-3-hydroxybutanoic acid

C4H9NO3 Organic Compounds CAS 72-19-5
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Quick Reference
Formula / NotationC4H9NO3
CAS Number72-19-5
Molecular Weight119.12
Melting Point256 dec °C
Solubility97000 mg/L (at 25 °C)
AppearanceSolid; [Merck Index]
Also Known As(2S,3R)-2-amino-3-hydroxybutanoic acid; threonine; 72-19-5; L-(-)-Threonine; Threonin; (S)-Threonine; 2-amino-3-hydroxybutyric acid; Treonina; (2S,3R)-2-Amino-3-hydroxybutyric acid; Threoninum
CategoryOrganic Compounds

What is L-Threonine?

L-threonine is an optically active form of threonine having L-configuration. It has a role as a micronutrient, a nutraceutical, a mouse metabolite, a Saccharomyces cerevisiae metabolite, a plant metabolite, an Escherichia coli metabolite, a human metabolite and an algal metabolite. It is a L-alpha-amino acid, an aspartate family amino acid, a threonine and a proteinogenic amino acid. It is a conjugate base of a L-threoninium. It is a conjugate acid of a L-threoninate. It is an enantiomer of a D-threonine. It is a tautomer of a L-threonine zwitterion.

Formula & Notation

C4H9NO3

IUPAC Name: (2S,3R)-2-amino-3-hydroxybutanoic acid

Other Names / Synonyms: (2S,3R)-2-amino-3-hydroxybutanoic acid; threonine; 72-19-5; L-(-)-Threonine; Threonin; (S)-Threonine; 2-amino-3-hydroxybutyric acid; Treonina; (2S,3R)-2-Amino-3-hydroxybutyric acid; Threoninum

Properties & Characteristics

Appearance: Solid; [Merck Index]. Molecular formula: C4H9NO3. Molecular weight: 119.12 g/mol. Melting point: 256 dec °C. Solubility: 97000 mg/L (at 25 °C). Vapor pressure: 0.00000004 [mmHg]. LogP: -2.9.

Physical Data

PropertyValue
Melting Point256 dec °C
Molecular Weight119.12
Solubility97000 mg/L (at 25 °C)
AppearanceSolid; [Merck Index]

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 L-Threonine
Formula C4H9NO3
CAS Number 72-19-5
Molecular Weight 119.12
Synonyms (2S,3R)-2-amino-3-hydroxybutanoic acid; threonine; 72-19-5; L-(-)-Threonine; Threonin; (S)-Threonine; 2-amino-3-hydroxybutyric acid; Treonina; (2S,3R)-2-Amino-3-hydroxybutyric acid; Threoninum

Frequently Asked Questions

L-threonine is an optically active form of threonine having L-configuration. It has a role as a micronutrient, a nutraceutical, a mouse metabolite, a Saccharomyces cerevisiae metabolite, a plant metabolite, an Escherichia coli metabolite, a human metabolite and an algal metabolite. It is a L-alpha-amino acid, an aspartate family amino acid, a threonine and a proteinogenic amino acid. It is a conjugate base of a L-threoninium. It is a conjugate acid of a L-threoninate. It is an enantiomer of a D-threonine. It is a tautomer of a L-threonine zwitterion.

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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.