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 ?
In a way, a similar process occurs in the primordial soup experiment: Inside the oil droplet (garage) with the long-chain anhydride molecules there is no water, so its molecules survive longer.
Cyclic anhydride and protonated amide functional groups were identified as reaction intermediates, which resulted in carboxylic ester linkages between MSO and cellulose upon elevated temperature curing.
These eight amino acids were found to react with acetic anhydride providing significantly broader surface mapping potential than single amino acid modification methods.
Alcoholysis of anhydrides is catalyzed by tertiary amines.
Alkenylsuccinic anhydride (ASA) is one of the alkaline sizing chemicals commonly used in papermaking.
Similarly, water will open the anhydride to a diacid, which can be used in polyesters or neutralized with base to give a disalt.
There are a number of patents and published work related to melt grafting of maleic anhydride on olefinic polymers.
Broad line of epoxy hardeners and catalysts offered, including aliphatic polyamines, aliphatic and aromatic polyamine adducts, anhydrides and polyamides.
Keywords Isopropylthioxanthone, Maleic anhydride, Photoproduct, Kinetics, Photoinitiator
As the content of anhydrides increases, the peak systematically decreases, as shown in Fig.
As an alternative to HA-B18, Elf Atochem has Luchem HA-B-HMPA, a nonpolymeric reaction product of HA-R100 and an anhydride. This nonreactive stabilizer is planned for introduction in 1994.
It can be assumed that the terminal anhydrides groups on PET chain ends are thermally stable until 280 [degrees] C, even if this temperature is kept for 25 minutes.