26412-87-3

Pyridine sulfur trioxide CASNO:26412-87-3

Physical properties:

Pyridine sulfur trioxide (CAS 26412-87-3) is a white to off-white crystalline powder used as a mild sulfating and oxidizing agent in organic synthesis, including the Parikh-Doering oxidation. It is a moisture-sensitive, crystalline complex with a molecular weight of 159.16 g/mol and a melting point of roughly 150 — 170∘C.

Key Properties and Specifications

  • Formula: 𝐶5𝐻5𝑁⋅𝑆𝑂3
  • Appearance: White to off-white crystal powder
  • Melting Point: 150–165∘C
  • Assay: ≥97%
  • Stability: Moisture sensitive. It is generally recommended to store it in a cool and dark place, ideally under an inert gas,
  • Solubility: Reacts with water

Applications

  • Oxidation: Frequently used for the oxidation of alcohols to carbonyl compounds (Parikh-Doering oxidation).
  • Sulfation: Acts as a reagent for the introduction of the −SO3𝐻 group in organic synthesis

Safety and Handling

  • Hazards: Causes eye and skin burns; material is moisture sensitive and corrosive
  • Storage Temperature: Room temperature (preferred 2–30∘C)
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What is Pyridine Sulfur Trioxide?

It is a complex of pyridine and sulfur trioxide used as a sulfonating agent in organic synthesis.

What is the CAS number of Pyridine Sulfur Trioxide?

The CAS number is 26412-87-3.

What are the main applications of Pyridine Sulfur Trioxide?

It is used in sulfonation reactions, preparation of sulfates, and pharmaceutical intermediates.

Why is Pyridine Sulfur Trioxide used instead of free sulfur trioxide?

It offers better control, stability, and safer handling compared to free sulfur trioxide.

What purity levels are typically available?

It is usually supplied in high purity grades such as ≥98% or ≥99%.

How should Pyridine Sulfur Trioxide be stored?

Store in a cool, dry, well-ventilated area in tightly closed containers away from moisture.

FAQs

What is Pyridine Sulfur Trioxide?

It is a complex of pyridine and sulfur trioxide used as a sulfonating agent in organic synthesis.

What is the CAS number of Pyridine Sulfur Trioxide?

The CAS number is 26412-87-3.

What are the main applications of Pyridine Sulfur Trioxide?

It is used in sulfonation reactions, preparation of sulfates, and pharmaceutical intermediates.

Why is Pyridine Sulfur Trioxide used instead of free sulfur trioxide?

It offers better control, stability, and safer handling compared to free sulfur trioxide.

What purity levels are typically available?

It is usually supplied in high purity grades such as ≥98% or ≥99%.

How should Pyridine Sulfur Trioxide be stored?

Store in a cool, dry, well-ventilated area in tightly closed containers away from moisture.

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