Apr. 07, 2022
Benzaldehyde (C6h5cho) is an organic compound that is formed when the hydrogen of benzene is replaced by an aldehyde group. Benzaldehyde is the simplest and most commonly used aromatic aldehyde in the industry. At room temperature, it is a colorless liquid with a peculiar almond odor. Benzaldehyde is the main component of bitter almond oil extract. It can also be extracted from apricots, cherries, bay leaves, and peach kernels. This compound is also present in nuts and kernels in the form of a combination with glycosides (Amygdalin, Amygdalin) . Nowadays, benzaldehyde is mainly prepared from toluene by different means.
Benzaldehyde can be prepared by many methods. Currently, the main methods of preparation are liquid chlorination and toluene oxidation. Methods that have been eliminated include incomplete oxidation of benzyl alcohol, alkaline hydrolysis of benzoyl chloride, and the addition of benzene with carbon monoxide.
Benzaldehyde can be oxidized to a white, unpleasant-smelling benzoic acid solid that crystallizes on the inner walls of the container. Benzyl alcohol can be prepared by hydrogenating benzaldehyde or by the oxidative reduction of benzaldehyde itself in an alcoholic solution of potassium hydroxide (the products are potassium benzoate and benzyl alcohol). Cinnamic acid is produced by the reaction of benzaldehyde with anhydrous sodium acetate and acetic anhydride. An alcoholic solution of potassium cyanide can be used to catalyze the condensation reaction of benzaldehyde to produce benzoin.
Disproportionation of benzaldehyde in concentrated alkali solutions (Cannizzaro reaction, Cannizarro reaction): one aldehyde is reduced to the corresponding alcohol, while the other aldehyde is oxidized to a carboxylate. The rate of the reaction depends on the substituents on the aromatic ring.
Although widely used as a commercial food flavoring agent and industrial solvent, benzaldehyde is primarily used in the synthesis of a variety of other compounds, from pharmaceuticals to plastic additives. Benzaldehyde is also an important intermediate in the production of perfumes, fragrances, and some aniline dyes.
1. Benzaldehyde is an important chemical raw material used in the manufacture of lauric aldehyde, lauric acid, phenylacetaldehyde and benzyl benzoate, also used as perfume.
2. Benzaldehyde can be used as a special fragrance head, trace amounts for floral formulations, such as lilac, white orchid, jasmine, violet, acacia, sunflower, sweet pea, plum blossom, orange blossom, etc.
3. Also used in soap, also as edible spices almond, berries, cream, cherry, coconut, apricot, peach, pecan, plum, vanilla bean, spice and other spices. Alcoholic flavors such as rum, brandy and other types are also used.
4. Benzaldehyde is an intermediate of the herbicide wild swallow blight and the plant growth regulator diamine.
5. GB 2760-1996 regulations temporarily allow the use of food flavors. Mainly used in the preparation of almonds, cherries, peaches, nuts, and other types of flavors, the amount of up to 40%. As a flavoring agent for canned sweet cherries, add 3ML of sugar water per kilogram.
6. Intermediates of medicine, dyes, and perfumes. Used in the production of M-oxobenzaldehyde, lauric acid, lauric aldehyde, magenta green, benzyl benzoate, benzylidene aniline, benzylidene acetone, etc. Used in mixing soap, food flavoring, etc. for flavoring.
7. It is organic synthesis, solvent, determination of ozone and methylene next to carbonyl, determination of phenol and alkaloids, preparation of perfume.
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