Diacetyl peroxide

Diacetyl peroxide is the organic peroxide with the formula (CH3CO2)2.  It is a white solid or oily liquid with a sharp odor.  Since the pure material poses an explosion hazard, it is often used as a solution, e.g., in dimethyl phthalate as a solvent. 

Preparation
Diacetyl peroxide forms upon combining hydrogen peroxide and excess acetic anhydride.  Peracetic acid is an intermediate. 

Safety 
Organic peroxides are typically explosive since they contain both the oxidizer, the O-O bond, and reducing agents, the C-C and C-H bonds. 

It is shock sensitive and explosive. 

The threshold quantity for Process Safety Management per Occupational Safety and Health Administration 1910.119 is  if the concentration of the diacetyl peroxide solution is greater than 70%. 

There have been reports of detonation of the pure material.  The 25% solution also has explosive potential.  The crystalline peroxide is especially shock sensitive and a high explosion risk. 

Health hazards
Contact with liquid causes irritation of eyes and skin.  If ingested, irritates mouth and stomach. 

References 

Category:Organic peroxides
Category:Explosive chemicals