![]() ![]() Maleic acid is also used in manufacturing synthetic resins in textile processing in preserving oils and fats to retard rancidity of fats and oils in 1:10,000 (these are said to keep 3 times longer than those without the acid) dyeing and finishing wool, cotton, and silk preparing the maleate salts of antihistamines and similar drugs. It may be used to form acid addition salts with drugs to make them more stable, such as indacaterol maleate. Maleic acid is an industrial raw material for the production of glyoxylic acid by ozonolysis. It is a conjugate acid of a maleate(1-) and a maleate. It has a role as a plant metabolite, an algal metabolite and a mouse metabolite. DefinitionĬhEBI: Maleic acid is a butenedioic acid in which the double bond has cis- (Z)-configuration. Oxidation of benzene or by the reaction of butane with oxygen in the Maleic anhydride is prepared commercially by the Maleic anhydride is the main source of maleic acid produced by Its maleate ion is useful in biochemistry as an inhibitor of transaminase reactions. It reacts with drugs to form more stable addition salts like indacaterol maleate, carfenazine, chlorpheniramine, pyrilamine, methylergonovine and thiethylperazine. It is an electrophile and acts as dienophine in Diels-Alder reactions. Maleic acid is used as a precursor to fumaric acid, dimethyl maleate and glyoxalic acid. Both properties of maleic acid can be explained on account of the intramolecular hydrogen bonding that takes place in maleic acid at the expense of intermolecular interactions, and that are not possible in fumaric acid for geometric reasons. The melting point of maleic acid (135 ☌) is also much lower than that of fumaric acid (287 ☌). Maleic acid is more soluble in water than fumaric acid. The heat of combustion is -1355 kJ / mole. The difference in heat of combustion is 22.7 kJ Maleic acid is a less stable molecule than fumaric acid. Maleic acid is used in the preparation of fumaric acid by catalytic isomerization. The physical properties of maleic acid and fumaric acid are very different. Fumaric acid is the trans and maleic acid the cis isomer. These acids experience two-step dissociation in aqueous solutions.They have the same structural formula but different spatial configurations. Maleic acid and fumaric acid are the simplest unsaturated carboxylic diacids. Maleic acid, also known as maleinic acid and toxilic acid, is a white crystalline (monoclinic) powder and possesses a faint acidulous odor and an astringent taste. ![]() It is mainly used as a precursor to fumaric acid, and relative to its parent maleic anhydride, maleic acid has few applications. Maleic acid is the cis-isomer of butenedioic acid, where as fumaric acid is the trans-isomer. Maleic acid is an organic compound that is a dicarboxylic acid, a molecule with two carboxyl groups. ![]()
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