acid anhydride


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

acid anhydride

(ănhī`drīd, –drəd), chemical compound that reacts with water to form an acid (see acids and basesacids and bases,
two related classes of chemicals; the members of each class have a number of common properties when dissolved in a solvent, usually water. Properties
..... Click the link for more information.
). Anhydrides of inorganic acids are usually oxides of nonmetallic elements. Carbon dioxide, CO2, is the anhydride of carbonic acid, H2CO3 . Nitrogen pentoxide, N2O5, is the anhydride of nitric acid, HNO3 . Phosphorus pentoxide, P2O5, is the anhydride of phosphoric acid, H3PO4 . Sulfur dioxide, SO2, is the anhydride of sulfurous acid, H2SO3 . Sulfur trioxide, SO3, is the anhydride of sulfuric acid, H2SO4 . Anhydrides of organic acids, like the acids themselves, contain the carbonyl group, CO. Organic anhydrides include acetic anhydride or ethanoic anhydride, (CH3C=O)2O, and benzoic anhydride, (C6H5C=O)2O.

acid anhydride

[′as·əd ‚an′hīd‚rīd]
(chemistry)
An acid with one or more molecules of water removed; for example, SO3 is the acid anhydride of H2SO4, sulfuric acid.
References in periodicals archive ?
1996), and among the different reagent used; acid chloride and acid anhydride are the most applied (Samaranayake and Glasser 1993) in both heterogeneous and homogeneous media.
The patent describes the use of sorbitol (easily derived from starch) as the polyhydric alcohol and the use of succinic acid anhydride as the polycarboxylic acid.
The thermally and radiation curable powder coatings are comprised of at least one resin A having epoxy groups and at least one compound B having acid and/or acid anhydride groups, characterized in that the resin A has a specific content of epoxy groups of from 0.
Chlorendic anhydride is an acid anhydride with a chlorine content of 54.
Succinic anhydride (SAA) for applications where a dibasic acid anhydride is desired.
DDSA (dodecenyl succinic anhydride) is offered for producing tougher, more flexible cured polymers; Succinic anhydride (SAA) is recommended for applications where a dibasic acid anhydride is desired; and HHPA (hexahydrophthalic anhydride) hardener is also recommended for curing epoxies.
Sher, An efficient esterification of pullulan using activated carboxylic acid anhydrides with iodine, Collect.