Description

4,4,5,5-Tetramethyl-1,3-Dioxolan-2-One is a high-purity cyclic carbonate ester, also known as tetramethyl ethylene carbonate (TMEC). This specialty solvent and chemical intermediate is valued for its unique steric hindrance and solvating properties, offering distinct advantages over conventional carbonates. It is primarily sought after by research institutions and industrial manufacturers in the pharmaceutical, agrochemical, and advanced battery electrolyte sectors for applications requiring a non-nucleophilic, high-boiling polar aprotic solvent or a versatile building block for fine chemical synthesis.

Application

• Lithium-Ion Battery Electrolytes: Used as a high-voltage additive or co-solvent to enhance electrolyte stability, improve SEI film formation, and increase cycle life.
• Pharmaceutical Synthesis: Serves as a protected glycol unit or as a reactive intermediate in the synthesis of complex drug molecules and active pharmaceutical ingredients (APIs).
• Agrochemical Formulations: Employed as a solvent or co-solvent in the production of pesticides, herbicides, and other crop protection agents.
• Polymer Chemistry: Acts as a monomer or chain extender in the synthesis of polycarbonates, polyurethanes, and other specialty polymers.
• Chemical Intermediate: Utilized in organic synthesis for transesterification and carbonylation reactions, leveraging its sterically hindered structure.
• Specialty Solvent: Functions as a high-boiling, polar aprotic solvent for sensitive reactions where traditional solvents like DMF or NMP are unsuitable.

Basic Information

Product Name	4,4,5,5-Tetramethyl-1,3-Dioxolan-2-One
CAS No.	19424-29-4
Molecular Formula	C7H12O3
Molecular Weight	144.17 g/mol
Synonyms	Tetramethyl Ethylene Carbonate (TMEC); 2-Oxo-1,3-dioxolane-4,4,5,5-tetramethane; 4,4,5,5-Tetramethyl-2-oxo-1,3-dioxolane; 1,3-Dioxolan-2-one, 4,4,5,5-tetramethyl-; Tetramethylglycolide; NSC 163045
EINECS	243-086-3

Quality Control

Our 4,4,5,5-Tetramethyl-1,3-Dioxolan-2-One is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including chromatography and spectroscopy, to ensure it meets the highest standards of purity and consistency. Certificates of Analysis (COA) detailing specific batch results are available upon request to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from heat, sparks, and open flame. This material is moisture-sensitive; ensure containers are kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (GC)	≥ 98.0%
Water Content (KF)	≤ 0.5%
Refractive Index (n20D)	1.420 - 1.430
Density (20°C)	1.070 - 1.090 g/mL

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.