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Read the following paper and answer the associated questions. Synthesis and Reactivity of Bis(eta 5:eta 1 -pentafulvene)zirconium Complexes Ebert, H.; Timmermann, V.; Oswald, T.; Saak, W.; Schmidtmann, M.; Friedemann, M.; Haase, D.; Beekhaus, R. Organometallics 2014, 140312151524004. (DOI: 10.1021/om500031s) Why did the authors decide to undertake this study? What was their goal? How was compound 2a made? Propose a mechanism and classify cach step in the reaction. Describe the two resonance structures of the bis(pentafulvene)zirconium complex and assign formal oxidation states to the metal center. What physical measurements did the authors use to support this resonance assignment? What is an ansa-zirconoccnc and why do they form from bis(pentafulvene)zirconium complexes? What is the symmetry of compound 2 a and how is it reflected in the NMR data? Draw a plausible arrow-pushing mechanism the reaction of 2 a with molecular hydrogen and rationalize why this compound reacts with only 1 equivalent of hydrogen.
