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Cas No: 100-52-7
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Good quality benzaldehyde CAS 100-52-7
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100-52-7 Usage


Benzaldehyde can be slowly oxidized to benzoic acid in air, so a small amount of hydroquinone is often added to prevent its oxidation.

There is no α-H atom in the benzaldehyde molecule. Disproportionation reaction(Cannizarro reaction) may occur under the action of concentrated alkali:

Heating benzaldehyde in the presence of catalyst of cyanide ion, it will occur bimolecular condensation:

Reactivity Profile

A nontoxic, combustible liquid, reacts with oxidizing reagents. Benzaldehyde must be blanketed with an inert gas at all times since Benzaldehyde is oxidized readily by air to benzoic acid [Kirk-Othmer, 3rd ed., Vol. 3, 1978, p. 736]. In contact with strong acids or bases Benzaldehyde will undergo an exothermic condensation reaction [Sax, 9th ed., 1996, p. 327]. A violent reaction was observed on contact with peroxyacids (peroxyformic acid) [DiAns, J. et al., Ber., 1915, 48, p. 1136]. An explosion occurred when pyrrolidine, Benzaldehyde, and propionic acid were heated to form porphyrins.

Air & Water Reactions

Oxidizes in air to form benzoic acid, which is moderately toxic by ingestion. Insoluble in water.


Manufacture of dyes, perfumery, cinnamic and mandelic acids, as solvent; in flavors.


1. Benzaldehyde is an important raw material for medicine, dyestuff, perfume and resin industry. It also can be used as solvent, plasticizer and low temperature lubricant. In essence, it is mainly used for the deployment of food flavor. A small amount of benzaldehyde is daily use in flavor and flavor of tobacco. In spite of being widely used as commercial food condiment and industrial solvents, the main use of benzyl alcohol is still used to synthesize a variety of other compounds from pharmaceuticals to plastic additives. Benzyl alcohol is an important intermediate product in the production of perfumes, spices, and some aniline dyes.
Mandelic acid was synthesized by benzaldehyde as the starting reagent: With the first hydrocyanic acid reacts with benzaldehyde, then mandelonitrile hydrolyzed to Racemic mandelic acid. Glacialist LaChepelle and Stillman reported Ice crystallization is inhibited by benzaldehyde and aldehydes ice in 1966, so as to prevent the thick frost formation (Depth Hoar). This process can prevent snowslide caused by the instability of the snow cover. However, this compound has not been used extensively, because of the destruction of vegetation and polluted water sources.
2.It is mainly used for the preparation of flavors, such as almond, cherry, peach, nuts, etc., the amount is up to 40%. As aromatizing agent canned cherry syrup, adding amount is sugar 3mL/kg.
3. Pharmaceutical, dyestuff, spice intermediates. For the production of oxygen based benzene formaldehyde, lauric acid, lauric aldehyde, malachite, benzyl benzoate, benzyl aniline and benzylidene acetone etc.. Used to tune the soap flavor, edible essence, etc.
4. As the head of the special aroma, it is used trace formula for fragrance, such as lilac, white, violet, jasmine, acacia, sunflower, sweet plum, orange flower, Tofu pudding etc.. Also it is used in soap. Also it can be used as edible spices for almond, coconut cream, berries, cherries, apricots, peaches, plums, walnuts, and vanilla bean, spicy flavor. Wine with flavors such as rum, brandy, etc.
5. Benzaldehyde is an intermediate of herbicide resistance, plant growth regulator, and anti-amine.
6. Used as a reagent for the determination of ozone, phenol, alkaloid and methylene. Used in the preparation of spices.

Purification Methods

To diminish its rate of oxidation, benzaldehyde usually contains additives such as hydroquinone or catechol. It can be purified via its bisulfite addition compound but usually distillation (under nitrogen at reduced pressure) is sufficient. Prior to distillation it is washed with NaOH or 10% Na2CO3 (until no more CO2 is evolved), then with saturated Na2SO3 and H2O, followed by drying with CaSO4, MgSO4 or CaCl2. [Beilstein 7 IV 505.]


Benzaldehyde is an organic compound, and is synthetized by the way that the hydrogen of benzene is substituted by aldehyde. It is the most simple, and also the most commonly used industrial aromatic aldehyde. It is a colorless liquid at room temperature and has a special almond odor. Benzaldehyde is a compound that aldehyde is directly linked to the phenyl group, because it has a similar bitter almond flavor. Benzaldehyde widely exists in plant, especially in the Rosaceae plants. It is mainly in the form of glycosides in plant stem bark, leaves or seeds, such as amygdalin, bitter almond, cherry, laurel, peach. Benzaldehyde is naturally in bitter almond oil, patchouli oil, hyacinth oil, cananga oil. The compound is also in the nutlets and nuts, and exists in the form of Amygdalin, which is combination of glycosides. The chemical properties of Benzaldehyde is similar to that of aliphatic aldehydes, but It is also different. Benzaldehyde cannot reduce fehling reagent. When the reducing fat is used to reduce the benzaldehyde, the main products are benzene methanol, four substituted for the ortho-glycol and two-phenyl ethylene glycol. In the presence of potassium cyanide, two molecules of benzaldehyde form benzoin by acceptance the hydrogen atom. The substitution reaction in aromatic nucleus of benzaldehyde is mainly the meta-position product. For example, the main product is the m-nitrobenzaldehyde , when benzaldehyde is nitrated.


Benzaldehyde(C6H5CHO) is an aromatic aldehyde bearing a single formyl group with an almond odor. Benzaldehyde occurs naturally in bitter almond oil, patchouli oil, hyacinth oil and other essential oils. It is widely used as a precursor to prepare various aniline dyes, perfumes, flavorings, and pharmaceuticals, and as a solvent, plasticizer and cryogenic lubricant used industrially.

Fire Hazard

HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.

Chemical Properties

Colorless to light yellow liquid


Benzaldehyde can be prepared by a variety of ways.
  • Obtained from natural essential oils by fractionation.
  • Ozone oxidation and thiourea reduction reaction of natural cinnamon oil (containing cinnamaldehyde constituent 80% or more)
  • Catalytic oxidation of Toluene
  • Hydrolyze dichloromethane under alkaline conditions.

General Description

A clear colorless to yellow liquid with a bitter almond odor. Flash point near 145°F. More denser than water and insoluble in water. Hence sinks in water. Vapors are heavier than air. The primary hazard is to the environment. Immediate steps should be taken to limit spread to the environment. Easily penetrates the soil to contaminate groundwater and nearby waterways. Used in flavoring and perfume making.

100-52-7 Well-known Company Product Price

Brand (Code)Product description CAS number Packaging Price Detail
USP (1050905)  Benzaldehyde  United States Pharmacopeia (USP) Reference Standard 100-52-7 1050905-3X1ML 4,647.24CNY Detail
Sigma-Aldrich (Y0001064)  Benzaldehyde  European Pharmacopoeia (EP) Reference Standard 100-52-7 Y0001064-150MG 1,936.35CNY Detail
Sigma-Aldrich (PHR1203)  Benzaldehyde  pharmaceutical secondary standard; traceable to USP 100-52-7 PHR1203-3X1ML 732.19CNY Detail
Alfa Aesar (A10348)  Benzaldehyde, 99+%    100-52-7 5000g 1084.0CNY Detail
Alfa Aesar (A10348)  Benzaldehyde, 99+%    100-52-7 1000g 282.0CNY Detail
Alfa Aesar (A10348)  Benzaldehyde, 99+%    100-52-7 250g 229.0CNY Detail
Alfa Aesar (30749)  Benzaldehyde, 98%    100-52-7 3kg 579.0CNY Detail
Alfa Aesar (30749)  Benzaldehyde, 98%    100-52-7 1kg 212.0CNY Detail
Alfa Aesar (30749)  Benzaldehyde, 98%    100-52-7 250g 158.0CNY Detail
TCI America (B2379)  Benzaldehyde  >98.0%(GC) 100-52-7 500g 225.00CNY Detail



According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 10, 2017

Revision Date: Aug 10, 2017


1.1 GHS Product identifier

Product name benzaldehyde

1.2 Other means of identification

Product number -
Other names Benzoylhydride

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only. Food additives -> Flavoring Agents
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

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