2,4,7,9-Tetramethyl-5-decyne-4,7-diol, mixture of (±) and meso
2,4,7,9-Tetramethyl-5-decyne-4,7-diol (CAS: 126-86-3), a mixture of (±) and meso isomers, is a nonionic surfactant with a molecular weight of 226.36 g/mol. This acetylenic diol exhibits unique surface tension reduction properties, making it valuable in various industrial applications. It is primarily utilized as a wetting agent and defoamer, particularly in water-based formulations for coatings, inks, and adhesives.
- Synonyms
- 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, mixture of (±) and meso9-Tetramethyl-5-decyne-4,7-diol, mixture of (±) and meso126-86-3

Wetting Agent
As a nonionic surfactant, 2,4,7,9-Tetramethyl-5-decyne-4,7-diol effectively reduces surface tension, promoting superior wetting of low-energy substrates. This is crucial in applications like inks, coatings, and agricultural formulations.
Defoamer
This compound functions as a defoamer by disrupting foam lamellae, thereby controlling unwanted foam generation during manufacturing processes. It is commonly employed in paints, coatings, and adhesives.
Rheology Modifier
In certain formulations, this acetylenic diol can influence rheological properties, contributing to stable and desirable flow characteristics in water-based systems.
Materials Science
Its unique molecular structure lends itself to applications in materials science, including self-assembly processes and as a component in micro/nanoelectronics fabrication.
| Molecular weight | 226.36 |
|---|---|
| Linear formula | (CH3)2CHCH2C(CH3)(OH)C≡CC(CH3)(OH)CH2CH(CH3)2 |
| Assay | 98% |
| Boiling point | 255 °C(lit.) |
| Melting point | 42-44 °C(lit.) |

Hazard statements
- 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 | 113 °C / 235.4 °F |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36 |
| Safety statements (S) | 26-37/39 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Hlb | 4 |
|---|
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 2,4,7,9-Tetramethyl-5-decyne-4,7-diol used for?
+
2,4,7,9-Tetramethyl-5-decyne-4,7-diol is primarily used as a wetting agent and defoamer in various industrial applications, including coatings, inks, and adhesives. It also finds use in materials science and micro/nanoelectronics.
What are the CAS number and molecular formula?
+
The CAS number for 2,4,7,9-Tetramethyl-5-decyne-4,7-diol is 126-86-3. Its linear formula is (CH3)2CHCH2C(CH3)(OH)C≡CC(CH3)(OH)CH2CH(CH3)2.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies 2,4,7,9-Tetramethyl-5-decyne-4,7-diol with an assay of 98%. This product is not represented as USP, BP, EP, or other pharmacopoeia grades.
How should this chemical be handled safely?
+
This compound is an eye irritant (H319) and requires appropriate personal protective equipment, including eyeshields and gloves. In case of eye contact, rinse cautiously with water for several minutes and seek medical advice if irritation persists.
How is this product packed, shipped, and exported?
+
Tech Serve Solutions reliably packs, ships, and exports 2,4,7,9-Tetramethyl-5-decyne-4,7-diol globally to meet the demands of our diverse clientele.
How can I request a sample or quote?
+
To request a sample or a quote for 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, please contact our sales team through the website or by phone.
▶ Related products

(11-Mercaptoundecyl)-N,N,N-trimethylammonium bromide
Micro / NanoElectronics

(11-Mercaptoundecyl)hexa(ethylene glycol)
C23H48O7S
Micro / NanoElectronics
(12-Phosphonododecyl)phosphonic acid
C12H28O6P2
Micro / NanoElectronics
(2,2,3,3,4,4,5,5,6,6,7,7,7-Tridecafluoroheptyl)oxirane
C9H5F13O
Micro / NanoElectronics
(2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,9-Heptadecafluorononyl)oxirane
C11H5F17O
Micro / NanoElectronics
(3-Chloropropyl)dimethoxymethylsilane
Cl(CH2)3Si(OCH3)2CH3
Micro / NanoElectronics
(3-Chloropropyl)trimethoxysilane
Cl(CH2)3Si(OCH3)3
Micro / NanoElectronics
(4-Bromophenyl)diphenylsulfonium triflate
C19H14BrF3O3S2
Micro / NanoElectronics▶ Explore more

3-Methyl-1,5-di-p-tolyl-1,4-pentazadiene
Chemical Synthesis

3-Methyl-1,5-pentanediol
Chemical Synthesis

3-Methyl-1-(2-methylphenyl)-1H-pyrazol-5-amine
C11H13N3
Chemical Synthesis
3-Methyl-1-(3′-sulfoamidophenyl)-5-pyrazolone
C10H11N3O3S
Chemical Synthesis