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Glassware deactivation

Glassware deactivation with DMDCS

Dimethyldichlorsilane (DMDCS) reacts with active hydroxyl groups present on glass surface producing a deactivated layer. This ensures inert glassware used for sensitive compounds.


During the deactivation process, the reaction releases hydrogen chloride (HCl). So we strongly recommend to do this procedure in a fume hood.

  • Use 5% DMDCS solution in toluene. You can prepare this solution by diluting 20 ml of DMDCS with 400 ml toluene. Store the solution in an amber glass at room temperature.
  • Soak glassware in 5% DMDCS solution for 15 to 30 minutes.
  • Rinse glassware twice with toluene.
  • Soak glassware in methanol for 15 minutes.
  • Rinse glassware with methanol.
  • Dry glassware with high purity nitrogen (moisture and hydrocarbon free).