Molecular Formula: C₃H₉NO₃S
CAS No.: 3162-58-1
Molecular Weight: 139.17
Alias: Trimethylamine-sulfur trioxide complex, Sulfur trioxide-trimethylamine adduct

Appearance: White to off-white crystalline powder

Main Applications

Organic Synthesis Reagent

• Sulfonation/Sulfonylation Reactions:
  Acts as a mild sulfonating agent for synthesizing pharmaceutical intermediates (e.g., *m*-chlorobenzoyl chloride).

• Catalytic Additive:
  Enhances selectivity in acyl chlorination reactions (e.g., in iron powder catalytic systems).

Energy Materials

• Battery Cathode Catalyst:
  Derived materials (e.g., ZnS/N-C) improve oxygen reduction reaction (ORR) activity in zinc-air batteries.

• Ionic Conductor:
  Molecular chain-ion interactions enhance ionic conductivity in batteries.

Industrial Uses

Production of ion-exchange resins, pesticides, and dye intermediates.