Description

Diethyl Sulfite is an organic sulfur compound with the molecular formula C₄H₁₀O₃S, widely recognized for its utility as a versatile chemical intermediate and solvent. Its primary commercial value lies in its ability to act as an ethylating agent and a protective group in complex organic syntheses, offering a balance of reactivity and selectivity. This makes it a critical raw material for manufacturers in the pharmaceutical, agrochemical, and specialty chemical industries seeking to develop advanced active ingredients and fine chemicals.

Application

• Pharmaceutical Synthesis: Employed as a key intermediate and ethylating agent in the production of various active pharmaceutical ingredients (APIs).
• Agrochemical Manufacturing: Used in the synthesis of pesticides, herbicides, and fungicides where ethyl sulfonate groups are required.
• Polymer & Resin Modification: Acts as a cross-linking agent or modifier in specialty polymer formulations to alter physical properties.
• Organic Synthesis: Serves as a solvent and reagent for sulfonation and transesterification reactions in laboratory and industrial-scale fine chemical production.
• Flavor & Fragrance Industry: Utilized in the controlled synthesis of specific sulfur-containing aroma compounds.
• Electrolyte Additive: Investigated for use as a stabilizing additive in advanced lithium-ion battery electrolyte systems.

Basic Information

Product Name	Diethyl Sulfite
CAS No.	623-81-4
Molecular Formula	C₄H₁₀O₃S
Molecular Weight	138.19 g/mol
Synonyms	Sulfurous Acid, Diethyl Ester; Ethyl Sulfite; Diethyl Sulphite; Ethyl Sulphite; Diethoxysulfoxide; DES; NSC 8856
EINECS	210-806-6

Quality Control

Our Diethyl Sulfite is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing, including assay, purity verification, and impurity profiling, to ensure it meets the high standards required for industrial and research applications. Certificates of Analysis (COA) documenting all critical parameters are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent degradation from atmospheric moisture. For long-term storage, consider using an inert atmosphere to minimize oxidation.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (GC)	≥ 98.0%
Water Content (KF)	≤ 0.5%
Specific Gravity (20°C)	1.090 - 1.110
Refractive Index (20°C)	1.410 - 1.420

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