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Propyl (S)-(-)-Lactate
1. Basic Information
Name: Propyl (S)-(-)-Lactate
Alias: (S)-Propyl 2-hydroxypropanoate, L-Lactic acid propyl ester
CAS No.: 53651-69-7
Molecular Formula: C6H12O3
Molecular Weight: 132.16
Category: Chiral hydroxy ester, food flavor & chiral synthetic intermediate
2. Physical and Chemical Properties
Physical Properties
- Appearance: Colorless transparent oily liquid
- Odor: Mild sweet fruit, creamy lactone aroma
- Solubility: Miscible with ethanol, methanol, acetone, ethyl acetate; slightly soluble in water; insoluble in alkane solvents
- Boiling Range: 166–170 °C
- Refractive Index nD20: 1.415–1.419
- Hygroscopy: Slightly hygroscopic
- Aqueous Property: Weakly neutral, slowly hydrolyzed in long-term aqueous storage
Chemical Properties
- Molecular Structure: Propyl ester of L-lactic acid, single chiral center at C2 with S configuration, carries free hydroxyl group
- Hydroxyl reactivity: Capable of esterification, acylation, etherification protection for chiral building block synthesis
- Ester hydrolysis: Stable under neutral/weak acidic conditions; rapid hydrolysis under strong acid or strong alkali heating to generate L-lactic acid and n-propanol
- Thermal Stability: Stable below 140 °C; prolonged high temperature triggers dehydration to form acrylic ester derivatives
- Photostability: Moderately light-sensitive; long UV exposure causes slight yellow discoloration
- Compatibility: Compatible with most polar organic solvents, flavor raw materials; incompatible with concentrated strong alkali, strong oxidants
3. Main Application Fields
1. Food & Daily Flavor (Core Application)
Natural equivalent fruit flavor for beverage, candy, cream, bakery; solvent for food essence formulation
2. Chiral Synthetic Intermediate
Key chiral precursor for chiral pharmaceutical molecules, pesticide enantiomers and chiral separation reagents
3. Cosmetic Solvent
Low-irritant polar solvent for skin care essences, perfume carriers, mild solubilizer for plant extracts
4. GC Chiral Reference Standard
Chromatographic standard for lactic acid ester enantiomer purity detection
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 53651-69-7 |
| Molecular Formula | C6H12O3 |
| Appearance | Colorless clear liquid without suspended impurities |
| GC Purity | Flavor Grade ≥99.0%; Chiral Synthesis Grade ≥99.5% |
| Optical Rotation [α]D20 | -10.0 ~ -13.0 (neat) |
| Water Content (KF) | ≤0.10% |
| Acid Value | ≤0.5 mgKOH/g |
| Residue on Ignition | ≤0.05% |
| Single Unknown Impurity | ≤0.10% |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | Nitrogen-sealed amber plastic drum / coated iron drum |
| Storage Condition | Hermetically sealed cool dark warehouse below 25 °C; isolated from light, alkaline substances and oxidants |
| Transportation Requirement | Low-viscosity chiral ester liquid, light-proof sealed packaging, avoid high temperature |
| Shelf Life | 24 months under nitrogen-filled sealed storage |
| Test Item | Standard Specification |
| CAS Number | 53651-69-7 |
| Molecular Formula | C6H12O3 |
| Appearance | Colorless clear liquid without suspended impurities |
| GC Purity | Flavor Grade ≥99.0%; Chiral Synthesis Grade ≥99.5% |
| Optical Rotation [α]D20 | -10.0 ~ -13.0 (neat) |
| Water Content (KF) | ≤0.10% |
| Acid Value | ≤0.5 mgKOH/g |
| Residue on Ignition | ≤0.05% |
| Single Unknown Impurity | ≤0.10% |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | Nitrogen-sealed amber plastic drum / coated iron drum |
| Storage Condition | Hermetically sealed cool dark warehouse below 25 °C; isolated from light, alkaline substances and oxidants |
| Transportation Requirement | Low-viscosity chiral ester liquid, light-proof sealed packaging, avoid high temperature |
| Shelf Life | 24 months under nitrogen-filled sealed storage |
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