Arachidic Acid
Title: Arachidic Acid
CAS Registry Number: 506-30-9
CAS Name: Eicosanoic acid
Additional Names: arachic acid
Molecular Formula: C20H40O2
Molecular Weight: 312.53
Percent Composition: C 76.86%, H 12.90%, O 10.24%
Literature References: Fatty acid found in peanut oil, vegetable and fish oils, etc. Also obtained by hydrogenation of arachidonic acid: Ege et al., J. Am. Chem. Soc. 83, 3080 (1961). Synthesis: Linstead et al., J. Chem. Soc. 1955, 1097. Reviews: A. W. Ralston, Fatty Acids and Their Derivatives (Wiley & Sons, New York, 1948) pp 43-46; K. S. Markley, Fatty Acids Part I (Interscience, New York, 2nd ed., 1960) pp 164-167, 398-400.
Properties: Crystals from alc, mp 75.5°. bp760 ~328° with some decompn; bp1.0 205°. d4100 0.8240. nD100 1.4250. Practically insoluble in water; sparingly sol in cold water; freely in hot abs alcohol, benzene, chloroform, ether, petr ether.
Melting point: mp 75.5°
Boiling point: bp760 ~328° with some decompn; bp1.0 205°
Index of refraction: nD100 1.4250
Density: d4100 0.8240
Derivative Type: Methyl ester
Molecular Formula: C21H42O2
Molecular Weight: 326.56
Percent Composition: C 77.24%, H 12.96%, O 9.80%
Properties: mp 47°; bp1.0 180°.
Melting point: mp 47°
Boiling point: bp1.0 180°
Derivative Type: Ethyl ester
Molecular Formula: C22H44O2
Molecular Weight: 340.58
Percent Composition: C 77.58%, H 13.02%, O 9.40%
Properties: mp 41°; bp0.3 177°.
Melting point: mp 41°
Boiling point: bp0.3 177°

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