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The capability of cesium for adding ethylene, first described by Hackspill and Rohmer, is investigated in more detail. The reaction product Cs sub 2 C sub 2 H sub 4 possesses hydrogenating properties and, in association with metallic cesium, pronounced polymerization properties: (a) At normal pressure and room temperature, ethylene in contact with cesium is converted to a mixture of ethane and butane. (b) At pressures of 50 atm and temperatures of 40 to 100 exp 0 C, ethylene is polymerized to a mixture of higher olefins, in which isooctene and decene predominate. In this case 1 g-atom of cesium can convert 50 mole ethylene without any perceptible loss of catalytic capability. (c) Methyl iodide alters the addition product in the sense that it releases considerable quantities of acetylene on reaction with water. (d) The attack of propylene on cesium at room temperature occurs far more slowly than that of ethylene. At higher temperatures, slow polymerization under pressure also occurs in this case. Cesium reacts immediately with pure carbon dioxide, with strong heating and production of blue-black products, which form a clear alkaline solution of glycolic acid when dissolved in water. When cesium is dissolved in ammonia, it reacts with carbon dioxide at -78 exp 0 C in a few hours to form cesium formate and cesium carbaminate. Benzene yields cesium phenyl, togehter with free hydrogen, which indicates a substitution reaction. When reacted with water, the product yields diphenyl and phenol among other substances. An apparatus for preparing metallic cesium by thermal decomposition of cesium azide, as well as its preparation from cesium alum, is described. (ERA citation 02:001151)