4-Hydroxy-4-methyl-2-pentanone
4-Hydroxy-4-methyl-2-pentanone (CAS: 123-42-2), a valuable organic compound with the molecular formula (CH3)2C(OH)CH2COCH3 and a molecular weight of 116.16 g/mol, is a versatile ketone. Also known as diacetone alcohol, it serves as a key intermediate in chemical synthesis and finds applications as a solvent. Its chemical structure, featuring both a hydroxyl and a ketone group, allows for diverse reactions.
- IUPAC
- Diacetone alcohol

Chemical Synthesis Intermediate
4-Hydroxy-4-methyl-2-pentanone is utilised as a building block in the synthesis of various organic compounds. Its bifunctional nature enables it to participate in a range of chemical transformations, contributing to the production of more complex molecules.
Solvent Applications
This compound exhibits good solvency properties, making it suitable for use in certain industrial applications. It can dissolve a variety of organic materials, aiding in formulation and processing.
Precursor for MIBK
Diacetone alcohol can be readily dehydrated to produce methyl isobutyl ketone (MIBK), a widely used industrial solvent.
| Molecular weight | 116.16 |
|---|---|
| Linear formula | (CH3)2C(OH)CH2COCH3 |
| Assay | 99% |
| Boiling point | 166 °C(lit.) |
| Density | 0.931 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.423(lit.) |
| Vapour pressure | <1 mmHg (20 °C) |
| Vapour density | 4 (vs air) |


Hazard statements
- H226Flammable liquid and vapour
- H319Causes serious eye irritation
Precautionary statements
- P305IF IN EYES
| Protective equipment | Eyeshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 58 °C / 136.4 °F |
| Transport (UN / ADR) | UN 1148C 3 / PGIII |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36 |
| Safety statements (S) | 24/25 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Expl Lim | 6.9 % |
|---|
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 4-Hydroxy-4-methyl-2-pentanone used for?
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4-Hydroxy-4-methyl-2-pentanone is primarily used as an intermediate in chemical synthesis and as a solvent. It is also a precursor for the production of methyl isobutyl ketone (MIBK).
What is the CAS number and chemical formula for 4-Hydroxy-4-methyl-2-pentanone?
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The CAS number is 123-42-2, and the linear chemical formula is (CH3)2C(OH)CH2COCH3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Hydroxy-4-methyl-2-pentanone with an assay of 99%. This is a technical grade product and is not represented as USP, BP, EP, or any other pharmacopoeia standard.
How should 4-Hydroxy-4-methyl-2-pentanone be handled safely?
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4-Hydroxy-4-methyl-2-pentanone is a flammable liquid and vapour (H226) and can cause serious eye irritation (H319). Handling requires appropriate personal protective equipment, including eyeshields and gloves, and should be done in a well-ventilated area away from ignition sources.
Is 4-Hydroxy-4-methyl-2-pentanone a controlled substance?
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Based on the provided data, 4-Hydroxy-4-methyl-2-pentanone is not classified as a controlled substance.
How is 4-Hydroxy-4-methyl-2-pentanone packed and exported?
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4-Hydroxy-4-methyl-2-pentanone is packed according to relevant regulations for flammable liquids and is exported globally by Tech Serve Solutions.
How can I request a sample or quote for 4-Hydroxy-4-methyl-2-pentanone?
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To request a sample or a quote, please contact our sales team through the website or by phone.
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