L

L-Isoleucine

IUPAC: (2S,3S)-2-amino-3-methylpentanoic acid

C6H13NO2 Organic Compounds CAS 73-32-5
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Quick Reference
Formula / NotationC6H13NO2
CAS Number73-32-5
Molecular Weight131.17
Melting Point285.5 dec °C
Boiling PointSublimes at 168-170 °C
Solubility34400 mg/L (at 25 °C)
AppearanceWaxy shiny solid; [Merck Index] White solid; [Sigma-Aldrich MSDS]
Also Known As(2S,3S)-2-amino-3-methylpentanoic acid; Isoleucine; 73-32-5; (2S,3S)-2-Amino-3-methylpentanoic acid; 2S,3S-Isoleucine; (S)-Isoleucine; (S,S)-Isoleucine; 2-Amino-3-methylvaleric acid; erythro-L-Isoleucine; L-Ile
CategoryOrganic Compounds

What is L-Isoleucine?

L-isoleucine is the L-enantiomer of isoleucine. It has a role as 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, an isoleucine and a proteinogenic amino acid. It is a conjugate base of a L-isoleucinium. It is a conjugate acid of a L-isoleucinate. It is an enantiomer of a D-isoleucine. It is a tautomer of a L-isoleucine zwitterion.

Formula & Notation

C6H13NO2

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

Other Names / Synonyms: (2S,3S)-2-amino-3-methylpentanoic acid; Isoleucine; 73-32-5; (2S,3S)-2-Amino-3-methylpentanoic acid; 2S,3S-Isoleucine; (S)-Isoleucine; (S,S)-Isoleucine; 2-Amino-3-methylvaleric acid; erythro-L-Isoleucine; L-Ile

Properties & Characteristics

Appearance: Waxy shiny solid; [Merck Index] White solid; [Sigma-Aldrich MSDS]. Molecular formula: C6H13NO2. Molecular weight: 131.17 g/mol. Boiling point: Sublimes at 168-170 °C. Melting point: 285.5 dec °C. Solubility: 34400 mg/L (at 25 °C). Vapor pressure: 0.00000001 [mmHg]. LogP: -1.7.

Physical Data

PropertyValue
Melting Point285.5 dec °C
Boiling PointSublimes at 168-170 °C
Molecular Weight131.17
Solubility34400 mg/L (at 25 °C)
AppearanceWaxy shiny solid; [Merck Index] White solid; [Sigma-Aldrich 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 L-Isoleucine
Formula C6H13NO2
CAS Number 73-32-5
Molecular Weight 131.17
Synonyms (2S,3S)-2-amino-3-methylpentanoic acid; Isoleucine; 73-32-5; (2S,3S)-2-Amino-3-methylpentanoic acid; 2S,3S-Isoleucine; (S)-Isoleucine; (S,S)-Isoleucine; 2-Amino-3-methylvaleric acid; erythro-L-Isoleucine; L-Ile

Frequently Asked Questions

L-isoleucine is the L-enantiomer of isoleucine. It has a role as 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, an isoleucine and a proteinogenic amino acid. It is a conjugate base of a L-isoleucinium. It is a conjugate acid of a L-isoleucinate. It is an enantiomer of a D-isoleucine. It is a tautomer of a L-isoleucine 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.