Propionic anhydride

Propionyloxid

Colorless liquid with an unpleasant, pungent odor

Liquid

1.02 g · cm -3

-45 ° C

167 ° C.

1 hPa (20 ° C)

Decomposes in water

1.404 (20 ° C)

Risk

2360 mg · kg -1 ( LD50, rat, oral)

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Of propionic anhydride is a chemical compound from the group of carboxylic acid anhydrides.

Production and representation

Propionic anhydride can be obtained by dehydration of propionic acid with ketene:

Properties

Propionic anhydride having a pH of 2.5 and a viscosity of 1,144 mPa · s at 20 ° C. In water it decomposes to propionic acid.

Use

Of propionic anhydride is used as intermediate for the preparation of other chemical compounds (eg, propiophenone, fentanyl ) used.

Safety

The vapors of propionic anhydride can form (74 ° C, ignition temperature 315 ° C flash point) with air to form an explosive mixture. By exothermic hydrolysis to an acid ( propionic acid) also it is highly irritating to corrosive.