2,5-Dihydroxycinnamic acid

2,5-Dihydroxycinnamic acid
Names

IUPAC name 3-(2,5-dihydroxyphenyl)prop-2-enoic acid
Other names (2E)-3-(2,5-Dihydroxyphenyl)acrylic acid
Identifiers
CAS Number	636-01-1
3D model (Jmol)	Interactive image
ChemSpider	6442618
PubChem	181581
InChI InChI=1S/C9H8O4/c10-7-2-3-8(11)6(5-7)1-4-9(12)13/h1-5,10-11H,(H,12,13) Key: JXIPYOZBOMUUCA-UHFFFAOYSA-N
SMILES C1=CC(=C(C=C1O)C=CC(=O)O)O
Properties
Chemical formula	C₉H₈O₄
Molar mass	180.16 g·mol⁻¹
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

2,5-Dihydroxycinnamic acid is a hydroxycinnamic acid. It is an isomer of caffeic acid.

Preparation

2,5-Dihydroxycinnamic acid is produced by Elbs persulfate oxidation of o-Coumaric acid.^[1]^[2]

↑ Cain, J.C.; Greenaway, A.J. (1907). "Abstracts of Papers on Organic chemistry". Journal of the Chemical Society, abstracts. 92: A741–A812. doi:10.1039/CA9079200741.
↑ Otto, Neubauer; Flatow, L. (1907). "Synthesen von Alkaptonsäuren". Zeitschrift für Physiologische Chemie. 52: 375–398.

Aglycones

Precursor	Cinnamic acid

Monohydroxycinnamic acids (Coumaric acids)	p-Coumaric acid o-Coumaric acid m-Coumaric acid

Dihydroxycinnamic acids	Caffeic acid (3,4-dihydroxycinnamic acid) Umbellic acid (2,4-dihydroxycinnamic acid) 2,3-Dihydroxycinnamic acid 2,5-Dihydroxycinnamic acid 3,5-Dihydroxycinnamic acid

Trihydroxycinnamic acids	2,4,5-Trihydroxycinnamic acid 3,4,5-Trihydroxycinnamic acid

O-methylated forms	Ferulic acid 5-Hydroxyferulic acid Isoferulic acid Sinapinic acid

others	Plicatin A Plicatin B

Esters

glycoside-likes

Esters of
caffeic acid
with cyclitols

esters of quinic acid	Chlorogenic acid (3-caffeoylquinic acid) Cryptochlorogenic acid (4-O-caffeoylquinic acid) Neochlorogenic acid (5-O-Caffeoylquinic acid) Cynarine (1,5-dicaffeoylquinic acid) 3,4-dicaffeoylquinic acid 3,5-dicaffeoylquinic acid

esters of shikimic acid	Dactylifric acid (3-O-caffeoylshikimic acid)

Glycosides

Tartaric acid esters

Other esters
with caffeic acid

Caffeoyl phenylethanoid
glycoside (CPG)

Oligomeric forms

Dimers	Diferulic acids (DiFA) : 5,5'-Diferulic acid, 8-O-4'-Diferulic acid, 8,5'-Diferulic acid, 8,5'-DiFA (DC), 8,5'-DiFA (BF), 8,8'-Diferulic acid

Trimers	Triferulic acids : 5-5',8'-O-4"-Triferulic acid

Tetramers	Tetraferulic acids

Conjugates with
coenzyme A (CoA)

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