p-Coumaric Acid
Title: p-Coumaric Acid
CAS Registry Number: 7400-08-0
CAS Name: 3-(4-Hydroxyphenyl)-2-propenoic acid
Additional Names: p-hydroxycinnamic acid; b-[4-hydroxyphenyl]acrylic acid
Molecular Formula: C9H8O3
Molecular Weight: 164.16
Percent Composition: C 65.85%, H 4.91%, O 29.24%
Literature References: Isoln: Hlasiwetz, Ann. 136, 31 (1865); Bamberger, Monatsh. Chem. 12, 459 (1891). Prepn: Eigel, Ber. 20, 2528 (1887); Konek, Pacsu, Ber. 51, 856 (1918). uv data: Wheeler, Covarrubias, J. Org. Chem. 28, 2015 (1963).
Properties: Needles, mp 210-213° (reported in early lit as 206°). Crystallizes in anhydrous form from conc hot aq soln, but as monohydrate from dil aq soln on slow cooling. Slightly sol in cold water; sol in hot water and alc, ether. Practically insol in benzene and ligroin. uv max (95% ethanol): 223, 286 nm (e 14450, 19000).
Melting point: mp 210-213° (reported in early lit as 206°)
Absorption maximum: uv max (95% ethanol): 223, 286 nm (e 14450, 19000)

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