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(organic chemistry)
C9H6O2 The anhydride of o-coumaric acid; a toxic, white, crystalline lactone found in many plants and made synthetically; used in making perfume and soap. Also known as 1,2-benzopyrone.



a lactone of o-coumarinic acid; colorless crystals with an odor of new-mown hay. Melting point, 70°C; boiling point, 291°C. It has the following structural formula:

Coumarin is readily soluble in alcohol and ether and poorly soluble in water. It occurs in glucoside form in many plant species, for example, in sweet clover and sweet grass. Coumarin is industrially prepared from salicylic aldehyde and acetic anhydride. It serves as an odor-enhancing substance in the tobacco and perfume industries.

References in periodicals archive ?
Simultaneous determination of quercetin, rutin and coumaric acid in flowers of Rhododandrum arboreum by HPTLC.
Coumaric and caffeic acids are the starting substances
Quercetin, catechin, ferrulic acid, caffeic acid, gallic acid, coumaric acid, and rutin, are among the most common naturally occurred antioxidant phenolic compounds in foods.
They found that the activity of ferulic acid was greater than that of coumaric acid, which was greater than that of propyl gallate.
Although more than 300 constituents have been identified in propolis samples, biological activity is mainly due to a few substances, such as flavonoids, terpenes, caffeic, ferulic and coumaric acids and esters.
Methanol and ethyl acetate extracts of the yellow sweet cherry "Rainier" containing beta-carotene, ursolic, coumaric, ferulic and cafeic acids inhibited LPO by 78 and 79%, respectively, at 250 microg/mL.
The standard extract contains more than 17% coumarin and parts of coumaric acid and hydrocoumarin.