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nature : molecules simultaneously hydroxy-3-OH and carboxyl - COOH compounds. According to its structure can be divided into ethnic and hydroxy fatty acids and aromatic hydroxy acid two. Aliphatic hydroxy acid, also known as alkyd, according to the hydroxy acid connecting the carbon atoms on the location, can be divided into : (1) α-hydroxy acids, such as alpha-hydroxy acid (PLA), two heating elements acid off two water molecules transactions ester (461). (2) β - hydroxy acid, heating member acid water from off part of unsaturated acids, such as β - hydroxy acid can be derived by dehydration crotonic (3) - γ and δ-hydroxy acid, such as gamma-hydroxybutyrate OH-CH2CH2CH2 COOH, heating when members of acid water from off part of lactone. Aliphatic hydroxy acid is usually soluble in water crystals, melting point and the solubility in water than the corresponding high-fatty acids. Both alcohol response and acid reaction. Aromatic hydroxy acid in the nuclear-fang (benzene ring or thick) containing hydroxy acid is called, for example, to participate in acid acid and phenol unique to the variety of responses, which can be used for halogenated, nitration, sulfonation reaction.
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