anhydride

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anhydride

(ănhī`drīd, –drĭd) [Gr.,=without water], chemical compound formed by removing water, H2O, from another compound; the anhydride can also react with water to form the original compound. An acid anhydride reacts with water to form an acid; e.g., sulfur trioxide, SO3, reacts with water to form sulfuric acid, H2SO4. A basic anhydride reacts with water to form a base; e.g., calcium oxide, CaO, reacts with water to form calcium hydroxide, Ca(OH)2. Anhydrides of organic acids have many uses. They react with alcohols to form esters; e.g., acetic anhydride, (CH3CO)2O, reacts with ethanol, C2H5OH, to form ethyl acetate, CH3COOC2H5, a useful solvent. They also react with ammonia and primary or secondary amines to form amides. Other important acid anhydrides include maleic anhydride and phthalic anhydride.

anhydride

[an′hī‚drīd]
(chemistry)
A compound formed from an acid by removal of water.

anhydride

1. a compound that has been formed from another compound by dehydration
2. a compound that forms an acid or base when added to water
3. any organic compound containing the group -CO.O.CO- formed by removal of one water molecule from two carboxyl groups
References in periodicals archive ?
The anhydrides were predicted to react with the amino acid side chains of serine, threonine, arginine, asparagine, lysine, histidine, tyrosine, glutamine, and cysteine.
Primary amines react well with anhydrides through a nucleophilic acyl substitution reaction, forming an amide and carboxylic acid, both of which are unreactive with amino acid side chains.
Films of the epoxidized polymer were crosslinked using 1,5-diaminopentane (amine A), 1,9-diaminononane (amine B), pyromellitic anhydride (anhydride A), or trimellitic anhydride (anhydride B).
Table 2 -- Anhydride Cured Films Cure MEK (a) Forward Time Double Pencil Impact Reverse 60[degrees] Film Anhyride (min.
Alkenylsuccinic anhydride (ASA) is one of the alkaline sizing chemicals commonly used in papermaking.
The characteristic difference between AOSA and ASA is that for AOSA compounds the succinic anhydride groups are always linked to the center of the alkenyl chains.
Similarly, water will open the anhydride to a diacid, which can be used in polyesters or neutralized with base to give a disalt.
Chains extension by ester formation between anhydrides and free hydroxyl chain ends (Reaction II) is therefore suggested as a reaction scheme for this step.
Broad line of epoxy hardeners and catalysts offered, including aliphatic polyamines, aliphatic and aromatic polyamine adducts, anhydrides and polyamides.
An updated market report "Maleic Anhydride (MA): 2010 World Market Outlook And Forecast" has been recently issued by Market Publishers, Ltd.
Since EVA has no reactive "handles" for the hydrazide functionality, Elf Atochem reacted HA-R100 with an anhydride to raise the molecular weight, thus preventing migration and providing a resin-compatible "carrier.
A broad line of epoxy hardeners and catalysts is offered, including aliphatic polyamines, aliphatic and aromatic polyamine adducts, anhydrides and polyamides.