Method for preparation of boratabenzene derivatives

C - Chemistry – Metallurgy – 07 – F

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C07F 17/00 (2006.01) C07F 5/02 (2006.01)

Patent

CA 2431962

A process for preparing boratabenzene derivatives is provided. The process includes the hydrogenation of a compound containing a boranaphthalene functional group to form a boratabenzene-containing compound. Depending on the compound containing a boranaphthalene functional group, the resulting boratabenzene compound may be converted into a catalyst suitable for olefin polymerization. A process for forming a boratabenzene derivative from a halo- dioxaborolane is also provided. In this process, a halo-dioxaborolane is reacted with a piperylide salt for form a pentadienyl dioxaborolane. The pentadienyl-dioxaborolane is reacted with a strong base to form an intermediate boratacyclohexanediene salt. The intermediate boratacyclohexanediene salt is then reacted with a trialkylaluminum compound to form an alkylboratabenzene salt.

La présente invention concerne un processus de préparation de dérivés de boratabenzène. Ce processus comprend l'hydrogénation d'un composé contenant un groupe fonctionnel boranaphtalène de façon à former un composé contenant du boratabenzène. En fonction de ce composé contenant un groupe fonctionnel boranaphtalène, le composé boratabenzène qui en résulte peut être transformé dans un catalyseur adapté pour une polymérisation d'oléfine. Cette invention concerne aussi un processus de formation de dérivé de boratabenzène à partir d'un halo-dioxaborolane. Dans ce processus, on fait réagir un halo-dioxaborolane avec un sel de piperlide de façon à former un dioxaborolane pentadiènyle. On fait réagir ce dioxaborolane pentadiènyle avec un composé de forte basicité de façon à former un sel boratacyclohexanediène intermédiaire. On fait ensuite réagir ce sel boratacyclohexanediène intermédiaire avec un composé trialkylaluminium de façon à former un sel alkylboratabenzène.

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