Preparation and Reactions of Cationic Zirconacycles

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In order to develop novel type of reactions using zirconium cation species, we synthesized novel zirconium complexes which were used for the project as a target. Dienes which have a chloride at C2 carbon cyclized, when they were treated with dibutylzirconocene. In this reaction, the diene moiety cyclized to form a zirconacyclopentane as the cyclized product. The chloride at C2 carbon of dienes came to β-position of zirconacyclopentanes. And then further reaction proceeded because of the chloride at β-position. Elimination of the chloride occurred and this moiety was converted into a carbon-carbon double bond and the eliminated chloride was trapped by zirconium metal center. By this reaction alkylzirconocene chlorides were obtained. When the compounds were treated with MAO (methylalumoxane) and the phenylacetylene, novel type of insertion reaction was observed.