Ethylene is trimerized to form 1-hexene, at a selectivity of up to about 99 mole percent, by contacting ethylene, at an ethylene pressure of from about 200-1500 psig and at a reaction temperature of from about 0.degree. C. to about 100.degree. C., with a catalyst comprising a tantalum compound (e.g., TaCl.sub.5) and a alkylating component comprising a metal hydrocarbyl compound or a metal hydrocarbyl halide compound (e.g., Sn(CH.sub.3).sub.4).

El etileno es trimerized para formar 1-hexene, en una selectividad hasta de cerca de 99 por ciento del topo, entrando en contacto con el etileno, en una presión del etileno de cerca de 200-1500 psig y en una temperatura de la reacción alrededor de 0.degree. C. alrededor a 100.degree. C., con un catalizador abarcando un compuesto del tantalio (e.g., TaCl.sub.5) y un componente alkylating que abarca un compuesto del hydrocarbyl del metal o un compuesto halide del hydrocarbyl del metal (e.g., Sn(CH.sub.3).sub.4).

 
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