The dibromide, WBr 2, is a non-volatile bluishblack powder obtained by reducing the pentabromide with hydrogen.
Succinonitrile, C2H4(CN)2r is obtained by the action of potassium cyanide on ethylene dibromide or by the electrolysis of a solution of potassium cyanacetate.
Fischer has used it as a condensing agent in the preparation of aand 0-acrose from acrolein dibromide.
The '1.1' dicarboxylic acid is prepared from ethylene dibromide and sodio-malonic ester.
These acids are obtained by the reduction of the hydrobromides of the diand tetra-hydroterephthalic acids or by the action of ethylene dibromide on disodio-butane tetracarboxylic acid.