18523-58-5

Basic information

• Product Name: 3,3,4-trimethyloxetan-2-one
• Synonyms: 2-Oxetanone, 3,3,4-trimethyl-; 3,3,4-Trimethyl-2-oxetanone
• CAS NO: 18523-58-5
• Molecular Formula: C₆H₁₀O₂
• Molecular Weight: 114.1424
• Mol File: 18523-58-5.mol
• Article Data: 1

Chemical Properties

• Boiling Point: 144.2°C at 760 mmHg
• Flash Point: 40.8°C
• Density: 0.976g/cm³
• Vapor Pressure: 5.16mmHg at 25°C
• Refractive Index: 1.42
• CAS DataBase Reference: 3,3,4-trimethyloxetan-2-one(CAS DataBase Reference)
• NIST Chemistry Reference: 3,3,4-trimethyloxetan-2-one(18523-58-5)
• EPA Substance Registry System: 3,3,4-trimethyloxetan-2-one(18523-58-5)

Safety Data

• Hazardous Substances Data: 18523-58-5(Hazardous Substances Data)

Upstream product

• 598-26-5 dimethylketene 
• 75-07-0 acetaldehyde 

Downstream Products

• 513-35-9 2-methyl-but-2-ene 
• 15719-64-9 methylammonium carbonate 

Relevant articles and documents

Polyester from dimethylketene and acetaldehyde: Direct copolymerization and β-lactone ring-opening polymerization

Two ways to obtain aliphatic polyesters (PEs) from dimethylketene and acetaldehyde were investigated. On the one hand, a direct anionic copolymerization was carried out in toluene at -60 °C. The resulting polymer was mainly composed of PE units. On the other hand, a two-step process involving the synthesis of 3,3,4-trimethyl-2-oxetanone by [2+2] cycloaddition, followed by its ring-opening polymerization, with various initiators and solvents, led to the expected PE. Molecular weights up to 9000 g mol -1 (measured by nuclear magnetic resonance (NMR)), with narrow polydispersity around 1.2, were obtained. These polymers were found stable up to 274 °C under nitrogen and a broad and complex endothermic peak attributed to crystallinity was observed near 139 °C by differential scanning calorimetry (DSC). The crystallinity, measured by X-ray diffraction, was close to 0.45.