Description and references
Oil extracted from the nuts of the tree Ongokea gore (Hua) Pierre, Olacaceae, growing in
equatorial Africa. Contains fatty acids (as glycerides): isanic
acid 46%, isanolic acid 44%. Refs: Scher, Arch. Pharm. 287, 548 (1954);
Dupont et al., Bull. Soc. Chim.
Fr. 1957, 1495; De Vries, Oleagineux 12, 427 (1957); Kneeland et
al., J. Am. Oil Chem. Soc. 35, 361 (1958). Extraction procedure: Lambert, US 2800492 (1957 to UCB). Structure of acids: Gunstone, Sealy, J. Chem. Soc. 1963, 5772; Morris, ibid. 5779.
Properties
Typical characteristics: Acid no. 1-10; ester
no. 183.5; sapon no. 185-200; iodine no. 254-259; d420 0.973-0.983; nD20 1.505-1.509; viscosity (25°): 7-10 P.
Soluble in acetone, benzene, ethyl ether, carbon tetrachloride, chloroform.
Slightly sol in petr ether, ethanol, hexane. The viscosity increases
upon heating and the oil is transformed into a rubber-like mass.
Does not polymerize when heated to a moderate temp; when heated rapidly
to temp above 200° polymerization becomes so rapid as to become explosive.
Polymerization is explained by the acetylenic structure of isanic
acid.Use
In fire retardant paints.