|---- |Other names || phenylmethanal
Benzenecarboxaldehyde
Benzene carbaldehyde |---- | Notation SPALLING HAMMERS ||c1ccccc1C=O |---- |----- |----- |----- | Not of boiling || 179 °C under 1 bar |----- |----- | Viscosity || 1,4 CP (25 °C) |-----

Two chemists, Friedrich Wöhler and Justus Liebig analyze, in 1832, the bitter almond gasoline in which they find benzaldéhyde C₇H₆O. While insulating the compound and while making it react, they realize that a grouping, that they name radical C₇H₅O benzoyl, remains unchanged.

The benzaldéhyde is a colorless liquid with bitter almond odor, it is the Aldéhyde simplest Aromatique. A molecule close to benzaldéhyde, the phényléthanal feels the hyacinth and one uses it in perfumery under the name of hyacinthine. One uses benzaldéhyde in the Kirsch imagination (note of core), the white Colle and the treatment of the Vin S. It is present in the fishing S, the Raisin, the strawberry S and the Framboise S and is responsible for the odor of the Airelle S.

Preparation

One prepares benzaldéhyde by the oxidation of the Toluène or by hydrolysis of dimethylchlorobenzene. It is also formed by hydrolysis of the Amygdaline present in almonds and the cores of certain fruits (Abricot S.)

Chemical properties

The complete Combustion of benzaldéhyde gives Carbon dioxide and water.

The benzaldéhyde can be oxidized in Benzoic acid C₆H₅-COOH with unpleasant odor. This reaction of self-oxidation occurs slowly with the air with room temperature what explains why one preserves it under an atmosphere of nitrogen.

In basic medium, it can give place to a Réaction of Cannizzaro.

To characterize benzaldéhyde (and aldehydes), one makes it act on the Hydrazine H₂N-NH₂) or his derivatives like phenylhydrazine. C₆H₅-NH-NH₂.

Uses

• Perfumery produced odoriferous.
• Food: preparation of the Cinnamaldéhyde and its derivatives.
• Flavor S artificial of Almond and Cherry.
• intermediate industrialist for the manufacture of Benzoic acid.
• Solvent: resins, acetate and Nitrate of cellulose.
• dye S
• Pesticide S: éphédrine.
• Repulsive of the bees during the harvest of honey.

External bonds

• ineris
• oxidation of the benzaldéhyde

• International Chemical Safety Card 0102

• European Chemicals Office
• Benzaldehyde description At ChemicalLand21.com

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