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It is a phenylpropanoid that is naturally synthesized by the shikimate pathway. [2] This pale yellow, viscous liquid occurs in the bark of cinnamon trees and other species of the genus Cinnamomum. It is an essential oil. The bark of cinnamon tree contains high concentrations of cinnamaldehyde. [3]
It is obtained from oil of cinnamon, or from balsams such as storax. [4] It is also found in shea butter. [citation needed] Cinnamic acid has a honey-like odor; [2] and its more volatile ethyl ester, ethyl cinnamate, is a flavor component in the essential oil of cinnamon, in which related cinnamaldehyde is the major constituent.
Phenylpropenes broadly are compounds containing a phenyl ring bonded to propene, more specifically those with an allyl group bonded to a benzene ring, having the parent structure of allylbenzene.
Phenylpropiolic acid, C 6 H 5 CCCO 2 H, formed by the action of alcoholic potash on cinnamic acid dibromide, C 6 H 5 CHBrCHBrCO 2 H, crystallizes in long needles or prisms which melt at 136–137 °C. When heated with water to 120 °C, it yields phenylacetylene (C 6 H 5 CCH).
Benzyl (2E)-3-phenylprop-2-enoate. Other names Benzyl cinnamate Cinnamein Benzyl cinnamoate Benzyl 3-phenylpropenoate 3-Phenyl-2-propenoic acid phenylmethyl ester
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These groups are found in many compounds. Propenyl compounds are isomeric with allyl compounds, which have the formula CH 2-CH=CH 2. The three common precursors to lignin are derivatives of propenylbenzene: paracoumaryl alcohol (1), coniferyl alcohol (2) and sinapyl alcohol (3).