Hexabromostearic acid

B) Hexabromostearic Acid.—In a 4-1. beaker equipped with a mechanical stirrer (Note 1), 90 to 95 g. of the fatty acids is dissolved in 2.5 1. of ethyl ether, and the solution is chilled to 0-10°. Then, with stirring, 35 cc. of bromine (Notes 2 and 3) is introduced slowly, from a dropping funnel (Note 4), at such a rate that the temperature does not exceed 20° about fifty minutes is usually required. The solution, which must contain an excess of bromine (deep red color), is allowed to stand in an ice bath at 0-10° overnight. The excess bromine is removed by addition of a small amount of amylene, and then the white precipitate is collected with suction on a 12.5-cm. Buchner funnel and is washed with 200 cc. of ethyl ether. The hexabromide is... 

In a 1-1. beaker 100 g. of crude hexabromostearic acid is heated to 70-80° with 600 cc. of dioxane (Note 7). The mixture is filtered, and the filtrate is set aside at 15-20° for several hours or preferably overnight. The precipitate is collected on a Buchner funnel with gentle suction and is washed thoroughly on the funnel with several 300-cc. portions of ethyl ether. The hexabromide is then transferred to a glass plate and spread out with a glass spatula to dry in the air. The fine snow-white crystals weigh 80 g. and melt at 181.5-181.9° (Note 8). 

Herring oil, 130,131,132,136, 557 Herring gull depot fat, 127 Heterobasidiomycetes, 154 Heterorhabdidae, 147 Hexabromostearic acids, 465 Hexachlorostearic acids, 465 Hexacosanoic acid, 1, 350 Hexadecanoic acid and esters, 1, 51,164, 179, 350-57... 

Hexabromostearic acid, see H-OOl26 Hexacontane, H-OOl27 Hexacosane, H-OOl28 Hexacosanedioic acid, H-OOl29... 

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