| Abstract
| - Reaction between bis(cyclopentadienyl)dimethylzirconium, ZrCp2(CH3)2, and phenylboronic anhydride, (PhBO)3,resulted in the formation of the heterocyclic dimer [ZrCp2{μ-O2BPh}]2 (1); no reaction was observed with themesityl derivative, (mesBO)3. Compound 1 was also synthesized from the protonolysis reaction between ZrCp2(CH3)2 and in situ generated phenylboronic acid, PhB(OH)2. This approach was extended to afford the analogouscomplexes [ZrCp2{μ-O2BAr}]2 (2, Ar = mes; 3, Ar = C6F5) from the corresponding isolable arylboronic acids,ArB(OH)2. The molecular structures of 1−3, determined by X-ray diffraction techniques, revealed a common, dimericmotif consisting of a central “Zr2B2O4” metallacycle. Variations in the bond parameters within the heterocycle areattributed to the differing steric and electronic properties of the aryl substituents at boron.
- The compounds [ZrCp2{μ-O2BAr}]2 (1, Ar = Ph; 2, Ar = mes; 3, Ar = C6F6) have been prepared from the protonolysis of dimethylzirconocene by the corresponding arylboronic acids, ArB(OH)2. Structural characterization of 1−3 revealed a common, dimeric motif consisting of a central “Zr2B2O4” heterocycle.
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