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Georg Thieme Verlag, Synlett: Accounts and Rapid Communications in Synthetic Organic Chemistry, 09(23), p. 1271-1282
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Alkynedicobalt Complexes in γ-Carbonyl Cations and Cycloheptynedicobalt Complexes
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Abstract
This Account describes our work on highly electrophilic γ-carbonyl cations featuring propargyldicobalt cations, cycloheptynedicobalt complexes, and the interconnection between the two systems.1 Introduction2 γ-Carbonyl Cations via Iron Allyl Cations3 γ-Carbonyl Cations via Propargyldicobalt Cations3.1 Synthesis of Velloziolide3.2 Synthesis of Microstegiol4 Synthesis of Cycloheptynedicobalt Complexes4.1 Synthesis via γ-Carbonyl Cations4.2 Cycloheptynedicobalt Complexes via [4+3] Cycloaddition Reactions4.3 Cycloheptynedicobalt Complexes via Ring-Closing Metathesis4.4 Cycloaddition Reactions on Cycloheptynedicobalt Complexes4.5 Cycloheptynedicobalt Complexes via Intramolecular Nicholas Reactions5 Dehydrotropylium Ion Co2(CO)6 Complex6 Final Comments