Title: Palustric Acid
CAS Registry Number: 1945-53-5
CAS Name: [1R-(1a,4ab,10aa)]-1,2,3,4,4a,5,6,9,10,10a-Decahydro-1,4a-dimethyl-7-(1-methylethyl)-1-phenanthrenecarboxylic acid
Additional Names: 13-isopropylpodocarpa-8,13-dien-15-oic acid
Molecular Formula: C20H30O2
Molecular Weight: 302.45
Percent Composition: C 79.42%, H 10.00%, O 10.58%
Literature References: Isoln from gum rosin: Loeblich et al., J. Am. Chem. Soc. 77, 2823 (1955); Joye et al., J. Org. Chem. 30, 654 (1965). Structure: Shuller et al., J. Am. Chem. Soc. 82, 1734 (1960). Prepn of the 4-epi-form: Tabacik, Poisson, Bull. Soc. Chim. Fr. 1969, 3264.
Properties: Crystals from methanol, mp 162-167°. [a]D +71.6°. uv max (0.01N NaOH): 265-266 nm.
Melting point: mp 162-167°
Optical Rotation: [a]D +71.6°
Absorption maximum: uv max (0.01N NaOH): 265-266 nm
Derivative Type: Methyl ester
Molecular Formula: C21H32O2
Molecular Weight: 316.48
Percent Composition: C 79.70%, H 10.19%, O 10.11%
Properties: Crystals from methanol, mp 25-27°. [a]D +67.7°. uv max: 265-266 nm.
Melting point: mp 25-27°
Optical Rotation: [a]D +67.7°
Absorption maximum: uv max: 265-266 nm
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