Itaconic Acid | organic acid | organic salt
Site Map |   
  • 1

Product Catalogue

Supplier Details

Company Name: Qingdao Kehai Biochemistry Co., Ltd

Contact Person: Hu Wen Li

Tel:86-532-86150824
13606488500

Fax: 86-532-86151260

Email: betty@langyatai.com

Address:South shanghai RD,Coastal Industry Park, Jiaonan City,Qingdao China.

WebSite: http://www.yeskey.com/space/kehai3199/

    Home > News > Chemical properties of the organic acid
    Chemical properties of the organic acid - 2013-05-28 18:40:19
    Hydroxy acid molecule containing a hydroxyl group and a carboxyl group, a hydroxyl group and a carboxyl group having a general nature. Since mutual influence between hydroxyl and carboxyl groups, but also has some special properties. These properties because of the relative position of a hydroxyl group and a carboxyl group exhibit different differences.
    (A) Acid
    Since alkyd molecule electron-withdrawing inductive effect of hydroxyl, carboxyl degree of dissociation of the increased acidity, it is generally acidic alkyd stronger than the corresponding carboxylic acid. Effects due to induction of the growth with reduced transmission distance, the β-position hydroxyl group of the acid is smaller. For example:
    (B) the oxidation reaction
    Alkyd than the alcohol hydroxyl hydroxyl easily oxidized Torun reagent, dilute nitric acid oxidation of alcohols can, but can α-hydroxy acid is oxidized to α-keto acid. For example:
    (Three) dehydration reaction
    Hydroxy acid is unstable to heat, heating prone to dehydration. Between the hydroxyl and carboxyl groups of different relative positions, the dehydration reaction in different ways.
    ⒈ α-hydroxy acid, α-hydroxy acid dehydration when heated between the carboxyl and hydroxyl groups of molecules cross-dehydration reaction of lactide six-membered ring. For example:
    Lactide is a crystalline material, as with the ester solution, the acid and base hydrolysis reaction may be heated to produce the original α-hydroxy acids.
    ⒉ B-hydroxy acid, B-hydroxy acid dehydration of α-hydrogen of the carboxyl group and a hydroxyl group by both effects, more lively, so when heated, hydroxyl easily intramolecular dehydration, generating α, B-unsaturated carboxylic acids such as:
    ⒊ γ-, 8 - γ-hydroxy acid dehydration or 8 - hydroxy acid molecule at room temperature between the hydroxyl and carboxyl group by dehydration cyclic structure
    Structure of the ester, said lactone. Five-membered ring lactone, said γ-lactone, said six-membered ring lactone 8 - lactone.
    Lactones and esters as water-soluble small, easy-open ring in lye generate the corresponding water-soluble γ-, 8 - hydroxy acid. Then dilute acid, and automatic dehydration cyclization γ-or 8 - lactone, and precipitated from water.
    (Iv) the decarboxylation reaction
    α-hydroxy acid, hydroxyl and carboxyl groups in close proximity, due to induction effect, the α-carbon atom and the electron density between the carboxyl group reduced in favor of carbon - carbon bond breaking. When the α-hydroxy acid with dilute sulfuric acid when heated, decompose decarboxylation, formic acid and an aldehyde or ketone.
    If the reaction with acidic potassium permanganate, then a reduction of the oxidation of formic acid and aldehyde also.

    Contact us

    Minimize
    We are online!