Isobutyric anhydride

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Structural formula
Structural formula of isobutyric anhydride
General
Surname Isobutyric anhydride
other names
  • 2-methylpropionic anhydride
  • Bis (2-methylpropionic acid) anhydride
Molecular formula C 8 H 14 O 3
Brief description

colorless liquid with a pungent odor

External identifiers / databases
CAS number 97-72-3
EC number 202-603-6
ECHA InfoCard 100.002.367
PubChem 7346
Wikidata Q26840869
properties
Molar mass 158.20 g mol −1
Physical state

liquid

density

0.95 g cm −3

Melting point

−56 to −53 ° C

boiling point

179-182 ° C

Vapor pressure

5 hPa (50 ° C)

solubility
  • hydrolyzed in water
  • miscible with ethanol
Refractive index

1.4060 (20 ° C)

safety instructions
GHS labeling of hazardous substances
05 - Corrosive 06 - Toxic or very toxic

danger

H and P phrases H: 301-311-314
P: 280-301 + 330 + 331-302 + 352-305 + 351 + 338-309 + 310
Toxicological data
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

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

Extraction and presentation

Isobutyric anhydride can be obtained by reacting acetic anhydride with isobutyric acid .

properties

Isobutyric anhydride is a flammable, hardly flammable, colorless liquid with a pungent odor that hydrolyzes in water.

use

Isobutyric anhydride is used as a starting material for esters such as sucrose acetate isobutyrate , dyes, and agricultural chemicals.

safety instructions

The vapors of isobutyric anhydride can form an explosive mixture with air ( flash point 67 ° C, ignition temperature 375 ° C).

Individual evidence

  1. ↑ a b c d e f g h i j k Entry on isobutyric anhydride in the GESTIS substance database of the IFA , accessed on October 18, 2018(JavaScript required) .
  2. ↑ David R. Lide: CRC Handbook of Chemistry and Physics A Ready-reference Book of Chemical and Physical Data . CRC Press, 1995, ISBN 978-0-8493-0595-5 , pp. 406 ( limited preview in Google Book search).
  3. ↑ Data sheet Isobutyric anhydride, 97% from AlfaAesar, accessed on October 18, 2018 ( PDF )(JavaScript required) .
  4. ↑ a b Data sheet isobutyric anhydride (PDF) from Merck , accessed on October 18, 2018.
  5. ↑ Google Patents: US20050014974A1 - Process for the manufacture of isobutyric anhydride - Google Patents , accessed October 18, 2018.
  6. ↑ RC Ramaswamy, Mills Bailey, Scott Barnicki: Hydrolysis of Isobutyric Anhydride: Effect of Partial Miscibility of Reactants on Kinetics. In: Industrial & Engineering Chemistry Research. 49, 2010, p. 10572, doi : 10.1021 / ie1004459 .