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Cinnamic Acid

Molecular Formula: C9H8O2
CAS: 140-10-3

Cinnamic acid (C9H8O2) is a white to almost white crystalline powder with a slight cinnamon aroma. It belongs to the class of aromatic unsaturated carboxylic acids. It occurs naturally in cinnamon oil, styrene resin, and various plants. It can also be synthesized through the cinnamaldehyde oxidation method or the styrene method. Due to its excellent chemical activity and mild aroma, cinnamic acid is widely used in various fields such as perfumery, medicine, and organic synthesis.
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Cinnamic Acid Basic Properties

  • Appearance: White to almost white crystalline powder

  • Molecular Weight: 148.16

  • Melting Point: 133 °C(lit.)

  • Boiling Point: 300 °C(lit.)

  • Density: 1.248

  • Vapour Pressure: 1.3 hPa (128 °C)

  • Refractive Index: 1.5049 (estimate)

  • Flash Point: >230 °F

  • Solubility: Soluble in ethanol, methanol, petroleum ether, chloroform, insoluble in water

  • Storage Conditions: Store at RT

  • Package Information: 100g,500g, 1kg or customized

Cinnamic Acid Key Features

Natural source

Cinnamic acid is naturally present in cinnamon oil and balsam of Peru. As a nature-identical compound, its use in food and cosmetics is more acceptable to consumers and safer.

Excellent stability

High-purity cinnamic acid is highly crystalline, white in color, and stable, resistant to oxidation or decomposition, making it suitable for long-term storage and transportation.

Multifunctional chemical intermediate

This compound can undergo a variety of reactions, including esterification, halogenation, and oxidation. It is an important raw material for the synthesis of various compounds, including ethyl cinnamate, styrene, and benzoic acid.

Antibacterial and antioxidant properties

Cinnamic acid itself exhibits excellent inhibitory effects against a variety of bacteria, yeasts, and molds, and also possesses some antioxidant properties.

Cinnamic Acid Main Applications

Flavorings and synthetic intermediates

Cinnamic acid is used as a key raw material for floral and fruity flavors and fragrances. It is also an important raw material for the synthesis of methyl and ethyl cinnamate, enhancing the depth and longevity of aroma.

Pharmaceuticals and health products

In pharmaceutical chemistry, this compound is an important intermediate in the synthesis of antimicrobial agents, anti-inflammatory drugs, and preservatives, such as cinnamates. It is also being studied as a functional ingredient in health products.

Food and preservation

Natural cinnamic acid (also known as Ferulic Acid) is used as a food flavoring agent in baked goods, beverages, and other foods. It also serves as a preservative, effectively inhibiting microbial growth and extending shelf life.

Plastics and coatings

This compound can be used as a raw material for thermosetting materials and UV absorbers, improving the light stability and durability of products.

Precautions

  1. It should be stored in a sealed container, away from moisture and direct sunlight to prevent it from absorbing moisture or coming into contact with dust in the air.

  2. Cinnamic acid can be decomposed by strong oxidants (such as nitric acid, potassium permanganate, etc.) and needs to be stored separately to prevent dangerous reactions.

  3. Wear personal protective equipment such as gloves and goggles during operation to avoid inhalation of dust or skin contact. If contact occurs, rinse immediately with plenty of water.

  4. If there is any solid leakage, it should be collected in a clean container to avoid dust; the environment should be kept ventilated and it should not be flushed into the sewer system.

  5. Waste must be handed over to qualified units for incineration or chemical treatment, and it is prohibited to discard or discharge it into the environment at will.

FAQ

1. Is cinnamic acid naturally derived or synthetically produced?

It can be derived from natural cinnamon oil, cinnamon bean extract, or synthesized through oxidation of styrene or cinnamaldehyde. Modern industry typically uses synthetic methods to ensure purity and stability.


2. Is there a difference between natural and synthetic cinnamic acid?

There's no difference in chemical structure (C6H2O2). The main difference lies in the source. Natural cinnamic acid is extracted from plant resources like cinnamon oil, while synthetic cinnamic acid is produced through chemical methods like the Perkin reaction (reaction of benzaldehyde with acetic anhydride). While both have essentially the same chemical properties and applications, naturally derived products are more attractive in certain high-end markets, such as natural cosmetics and health supplements.


3. What's the difference between cinnamic acid and cinnamaldehyde?

Cinnamic acid is an acidic compound, while cinnamaldehyde is an aldehyde. The former is primarily used in synthesis and perfumery, while the latter is primarily used as a fragrance and preservative. Their properties and uses differ.


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