4-Oxopentanal, CAS 626-96-0 and ECHA List no. 877-332-5, is a keto aldehyde also known as levulinaldehyde. Its molecular formula is C5H8O2 and molecular weight is 100.12 g/mol. The previously shown EC 210-957-8 does not match this substance and has been corrected. As a bifunctional carbonyl intermediate, 4-Oxopentanal can undergo condition-dependent oxidation, condensation and other side reactions. Buyers should qualify the actual form, assay, impurity profile and storage stability rather than rely on generic physical-property claims.
4-Oxopentanal CAS 626-96-0
- CAS: 626-96-0
- Synonyms: 4-Oxopentanal, Levulinaldehyde, 4-Ketopentanal, Pentanal-4-one
- Molecular Formula: C₅H₈O₂
- Grade: Confirm identity by an appropriate analytical method, assay basis, related substances, residual solvents and storage requirements against the current COA; buyer qualification is required.
- Package: State required quantity and destination; confirm the current container, light or moisture protection, net weight, storage conditions and transport requirements against the current COA and SDS.
Product Description
Identity and physicochemical profile
| Item | Technical guidance |
|---|---|
| Product identity | 4-Oxopentanal; levulinaldehyde; 4-ketopentanal |
| CAS / EC or List no. | 626-96-0 / 877-332-5 |
| Formula / molecular weight | C₅H₈O₂ / 100.12 g/mol |
| Functional groups | One terminal aldehyde and one ketone within a five-carbon chain |
| Key purchase controls | Identity, chromatographic assay, water, oxidation products, condensation products, color and physical form |
Applications and grade selection
4-Oxopentanal may be evaluated in controlled carbonyl chemistry, cyclization, reductive transformation and specialty-intermediate synthesis. Its aldehyde and ketone functions can support useful selectivity but also create storage and reaction complexity, so buyers should use project-specific analytical and process qualification.
- Agree the identity technique, assay method and limits for oxidation, condensation and route-derived impurities.
- Confirm the delivered physical form, sampling method, storage temperature and retest conditions.
- Run the intended reaction at small scale and compare conversion, selectivity and downstream impurity carryover.
Storage and handling
Keep the material tightly sealed under the temperature, light and atmosphere conditions stated in the current documentation. Minimize opening and promptly record any color, phase or chromatographic change during qualification.
Safety, documentation and procurement
Handle as a reactive carbonyl intermediate using suitable gloves, eye protection and ventilation under the current SDS and site assessment. Procurement should define test methods, stability needs, quantity, packaging, destination and documentation.
FAQ - Technical & Supply Chain
-
Q:
Is 4-Oxopentanal adequately identified by the formula C5H8O2?
A: No. The formula does not distinguish 4-Oxopentanal from other C5H8O2 structures. This material is the ketoaldehyde CH3COCH2CH2CHO, with aldehyde and ketone functions at defined positions. Confirm the name, CAS 626-96-0 and an agreed chromatographic or spectral identity method rather than matching formula alone.
Ordering & Documentation
Key information for document requests, quotations, and supply planning.
Documents
COA, TDS, SDS/MSDS and packing details are available on request.
Quotation
Send the CAS number, grade, quantity, packing preference and destination.
Sample & Supply
Support is available for samples, trial orders, bulk and repeat supply.
Storage & Shipping
Product-specific conditions are confirmed before order.



