Plicatic Acid
Title: Plicatic Acid
CAS Registry Number: 16462-65-0
CAS Name: (1S,2S,3R)-1-(3,4-Dihydroxy-5-methoxyphenyl)-1,2,3,4-tetrahydro-2,3,7-trihydroxy-3-(hydroxymethyl)-6-methoxy-2-naphthalenecarboxylic acid
Molecular Formula: C20H22O10
Molecular Weight: 422.38
Percent Composition: C 56.87%, H 5.25%, O 37.88%
Literature References: Coloring constituent and agent associated with western red cedar asthma. Low-molecular weight lignan which occurs as the (-)-form. Isolation from the heartwood of western red cedar, Thuja plicata Donn: J. A. F. Gardner et al., Can. J. Chem. 37, 1703 (1959). Structure determn: idem et al., ibid. 44, 52 (1966). Absolute configuration: R. J. Swan et al., ibid. 45, 319 (1967). Chromatographic analysis: B. F. MacDonald, E. P. Swan, J. Chromatogr. 51, 553 (1970). Identification as coloring material: Y. Kai, E. P. Swan, Mokuzai Gakkaishi 36, 218 (1990). Role in asthma: M. Chan-Yeung et al., Am. Rev. Respir. Dis. 108, 1094 (1973); eidem, J. Allergy Clin. Immunol. 79, 792 (1987). Mechanism of action study: M. Chan-Yeung, Am. J. Ind. Med. 25, 13 (1994).
Properties: Light tan powder. [a]D21 -9.99° (water). uv max (water): 281 nm (log e 3.58). pKa: 3.0. Very sol in water; sol in absolute acetone and ethanol; very slightly sol in ethyl acetate and ether.
pKa: pKa: 3.0
Optical Rotation: [a]D21 -9.99° (water)
Absorption maximum: uv max (water): 281 nm (log e 3.58)

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