Cinnamic Acid

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cinnamic acid

[sə′nam·ik ′as·əd]
(organic chemistry)
C6H5CHCHCOOH Colorless, monoclinic acid; forms scales, slightly soluble in water; found in natural balsams.

Cinnamic Acid

 

(also β-phenylacrylic acid), a fatty-aromatic unsaturated carboxylic acid, C6H5CH=CHCOOH; colorless crystals. Two geometric isomers of cinnamic acid are known—the trans-isomer and cis-isomer. The trans-isomer is more stable and has a melting point of 133°C, and a boiling point of 300°C. The cis-isomer forms three polymorphic forms with melting points of 68°, 58°, and 42°C, respectively; the first form, allocinnamic acid, exhibits the highest degree of stability.

Cinnamic acid is contained in Peru balsam and Tolu balsam (mainly in the form of esters), as well as in certain essential oils. In industry trans-cinnamic acid is usually prepared by condensation of acetone with benzaldehyde followed by oxidation of the product benzylidene acetone, C6H5CH = CHCOCH3, with hypochlorous acid. The cis-form is obtained from the byproducts of the cocaine industry. Esters of cinnamic acid serve as aromatic substances in perfumes and cosmetics.

References in periodicals archive ?
The strong hydrophobic interaction of the cinnamates side chains promotes the formation of spherical structure.
The colloidal spheres have cores formed from hydrophobic cinnamates segments and coronas formed from hydrophilic PVA backbone.
1]H NMR was used to calculate of the levels of the cinnamate in polymer chains.
10 mol% cinnamate groups were used to study the effect of water content on photosensitive properrties.
Photoreaction measurement was estimated by monitoring the intensity changes of the cinnamate absorption at maximal value.
70 ppm are due to aromatic protons of cinnamate units.
1]H results reveal that live functionalized polymers with different mol% of the cinnamate group (1.
In the current case, the prepared grafted polymer has PVA as backbone and cinnamate group as branches.
11:00 SYNTHESIS AND PHOTOPHYSICS OF MODEL COMPOUNDS CONTAINING ARYL CINNAMATE CHROMOPHORES
9:15 SOLVENT EFFECTS ON THE PHOTOPHYSICS OF MODEL ARYL CINNAMATE CHROMOPHORES
Again, the absorption, distribution and metabolism of cinnamate and cinnamyl derivatives, all compound structurally related to plicatin B, after oral administration (3-500 mg/body wt.
They show perturbed UV-Vis spectra but these spectra are unlike those seen in the LC polymers possibly reflecting significant perturbation of the cinnamate absorption spectrum by the polar effect of the OC[H.