(S)-(+)-1,3-Butanediol
(S)-(+)-1,3-Butanediol (CAS 24621-61-2) is a chiral diol with the molecular formula CH3CH(OH)CH2CH2OH and a molecular weight of 90.12 g/mol. This optically active compound is a valuable building block in organic synthesis. It finds applications in asymmetric synthesis and the preparation of complex organic molecules, serving as a versatile reagent for chemists in various research and development settings.
- Synonyms
- CH3CH(OH)CH2CH2OH(S)-1,3-Butylene glycol

Chiral Building Block
Serves as a key chiral intermediate in the stereoselective synthesis of complex organic molecules, pharmaceuticals, and agrochemicals.
Asymmetric Synthesis
Utilised in reactions requiring stereochemical control to create enantiomerically pure or enriched products.
Organic Synthesis
A versatile diol used in various organic transformations and as a starting material for functionalised compounds.
Polyol Chemistry
Can be incorporated into polymer structures or modified to create specialised polyol derivatives.
| Molecular weight | 90.12 |
|---|---|
| Linear formula | CH3CH(OH)CH2CH2OH |
| Assay | ≥95% (sum of enantiomers, GC) |
| Boiling point | 109 °C/14 mmHg(lit.) |
| Density | 1.005 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.440(lit.)n20/D 1.440 |
| Optical activity | [α]20/D +30±2°, c = 1% in ethanol |
| Vapour pressure | 0.06 mmHg (20 °C) |
| Vapour density | 3.1 (vs air) |
| Autoignition temp | 741 °F |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | Eyeshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 121 °C / 249.8 °F |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26-36 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is (S)-(+)-1,3-Butanediol used for?
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(S)-(+)-1,3-Butanediol is primarily used as a chiral building block in asymmetric synthesis and general organic synthesis for creating stereochemically defined molecules.
What is the CAS number and formula for (S)-(+)-1,3-Butanediol?
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The CAS number is 24621-61-2, and its linear formula is CH3CH(OH)CH2CH2OH.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies (S)-(+)-1,3-Butanediol with an assay of ≥95% (sum of enantiomers, GC). We do not represent this product as USP, BP, EP or other pharmacopoeia grades unless explicitly stated.
How should (S)-(+)-1,3-Butanediol be handled safely?
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(S)-(+)-1,3-Butanediol is classified as a GHS07 irritant. Handle with appropriate personal protective equipment, including eyeshields and gloves. Avoid inhalation of vapours and ensure adequate ventilation. Refer to the Safety Data Sheet for detailed handling procedures.
Is (S)-(+)-1,3-Butanediol a controlled substance?
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Based on the provided data, (S)-(+)-1,3-Butanediol is not indicated as a controlled substance.
How is (S)-(+)-1,3-Butanediol packed and shipped?
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Tech Serve Solutions exports fine chemicals globally. Specific packaging and shipping details are confirmed upon order, adhering to all relevant transport regulations.
How can I request a quote or sample for (S)-(+)-1,3-Butanediol?
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Please contact our sales team via the website or email to request a quote or sample. Include the product name and CAS number (24621-61-2) in your inquiry.
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