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Atomfair Sulfurous acid, diethyl ester C4H10O3S CAS 623-81-4

Sulfurous acid, diethyl ester (CAS No. 623-81-4), also known as diethyl sulfite , is a high-purity organosulfur compound with the molecular formula C4H10O3S . This colorless to pale yellow liquid is widely utilized in organic synthesis, pharmaceutical intermediates, and specialty chemical applications. Its IUPAC name, diethyl sulfite , reflects its structure as the diethyl ester of sulfurous acid. With a boiling point of approximately 156°C and a density of 1.10 g/cm3, it offers excellent solubility in common organic solvents while being sparingly soluble in water. Our product is rigorously tested to ensure ≥98% purity (GC), making it ideal for sensitive…

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Description

Sulfurous acid, diethyl ester (CAS No. 623-81-4), also known as diethyl sulfite, is a high-purity organosulfur compound with the molecular formula C4H10O3S. This colorless to pale yellow liquid is widely utilized in organic synthesis, pharmaceutical intermediates, and specialty chemical applications. Its IUPAC name, diethyl sulfite, reflects its structure as the diethyl ester of sulfurous acid. With a boiling point of approximately 156°C and a density of 1.10 g/cm3, it offers excellent solubility in common organic solvents while being sparingly soluble in water. Our product is rigorously tested to ensure ≥98% purity (GC), making it ideal for sensitive research and industrial processes. Proper storage under inert atmosphere is recommended to prevent hydrolysis.

Properties

  • CAS Number: 623-81-4
  • Complexity: 65.7
  • IUPAC Name: diethyl sulfite
  • InChI: InChI=1S/C4H10O3S/c1-3-6-8(5)7-4-2/h3-4H2,1-2H3
  • InChI Key: NVJBFARDFTXOTO-UHFFFAOYSA-N
  • Exact Mass: 138.03506535
  • Molecular Formula: C4H10O3S
  • Molecular Weight: 138.19
  • SMILES: CCOS(=O)OCC
  • Topological: 54.7
  • Monoisotopic Mass: 138.03506535
  • Physical Description: Clear colorless liquid;
  • Synonyms: Diethyl sulfite, 623-81-4, Ethyl sulfite, Sulfurous acid, diethyl ester, Diethyl sulphite, Ethyl sulfite, (Et2SO3), NSC 8838, EINECS 210-815-5, TL 158, BRN 1701906, DTXSID0060777, 4-01-00-01324 (Beilstein Handbook Reference), DTXCID4043309, 210-815-5, inchi=1/c4h10o3s/c1-3-6-8(5)7-4-2/h3-4h2,1-2h, sulfurous acid diethyl ester, LF6566JT87, NSC-8838, MFCD00009098, (ethoxysulfinyl)ethoxy, DIETHYLSULFITE, Diethyl sulfite, 98%, Sulphurous acid diethyl ester, SCHEMBL276169, UNII-LF6566JT87, (C2H5O)2SO, Diethyl ester of sulfurous acid, NSC8838, AAA62381, SBB060108, AKOS015843675, LS-13014, SY053383, DB-054150, CS-0204569, D0528, NS00043277, ST51046349, D95289, A833750, Q1936824

Application

Diethyl sulfite serves as a versatile alkylating agent and sulfur source in organic synthesis, particularly for introducing sulfite groups into molecular frameworks. It finds application as a stabilizer in polymer chemistry and as an intermediate in pharmaceutical manufacturing. Researchers also employ it as a mild reducing agent in selective transformations where stronger reductants would cause side reactions.

Safety and Hazards

GHS Hazard Statements

  • H226 (100%): Flammable liquid and vapor [Warning Flammable liquids]
  • H315 (97.5%): Causes skin irritation [Warning Skin corrosion/irritation]
  • H319 (97.5%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
  • H335 (95%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]

Precautionary Statements

  • P210, P233, P240, P241, P242, P243, P261, P264, P264+P265, P271, P280, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P370+P378, P403+P233, P403+P235, P405, and P501

Hazard Classes and Categories

  • Flam. Liq. 3 (100%)
  • Skin Irrit. 2 (97.5%)
  • Eye Irrit. 2 (97.5%)
  • STOT SE 3 (95%)

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Disclaimer: Sold exclusively for laboratory research. Prohibited for commercial use, diagnostics, or human/animal applications. Buyers assume all compliance liability.

Disclaimer

Intended Use & Restrictions

This product is sold exclusively for laboratory research, analytical testing, or non-commercial purposes.

  • Strictly prohibited: Resale, repackaging, or formulation into commercial products.
  • Not approved for human/animal use, diagnostics, or manufacturing (including pharmaceuticals, agrochemicals, or consumer goods).

Patent & Regulatory Compliance

Certain molecules may be protected by active patents or regulatory restrictions.

  • Buyers must independently verify patent status (e.g., via USPTO/EPO/CNIPA) and comply with local laws.
  • Atomfair LLC does not provide legal assurances regarding patent non-infringement or jurisdictional compliance.

Liability Release

By purchasing, the buyer agrees to:

  • Use this product only as permitted by law.
  • Indemnify Atomfair LLC against all claims arising from misuse, patent infringement, or regulatory violations.

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