| 摘要 |
Ethylated olefines are prepared by reacting ethylene with an acyclic olefine containing an a -allylic hydrogen atom at a temperature of 50-250 DEG C. and a pressure of 10 to 200 atmospheres in the presence of an organo-alkali metal catalyst. The expression "a -allylic hydrogen atom" denotes a hydrogen atom directly attached to a carbon atom bonded to other atoms by single bonds only and which is alpha to a carbon-to-carbon double bond. Specified acyclic olefines include propylene and various butenes, pentenes, hexenes, heptenes, octenes, nonenes, decenes, undecenes and dodecenes or mixtures thereof. Isomerization of the acyclic olefines may occur during the reaction. The proportion of ethylene is normally such as yields mono-ethylated olefines. The process is preferably carried out under substantially oxygen-free conditions and may be operated batchwise or continuously and in liquid or vapour phase: inert solvents or gases may be present. Specified catalysts include aryl-, alkyl- and alkenyl-sodium, potassium, lithium, rubidium and cesium compounds. In an example hexene-1 is heated in an autoclave with ethylene in the presence of sodiohexene-1 and hexane diluent yielding a mixture of octenes. |
