A Novel One-Step Nickel-Mediated Synthesis of C6Ar6 Conjugated Hydrocarbons, Highly Substituted and Overcrowded Fulvenes and 3,4-Dimethylenecyclobutenes

Abstract
Nickel-catalyzed cyclo-oligomerization of aryl-substituted 1,1-dibromoethylenes in the presence or absence of diarylacety-lenes produces 1,2,3,4,6,6-hexaarylfulvenes and/or 1,2-diaryl-3,4-bis(diarylmethylene)cyclobutenes in moderate yields, providing a new and simple method for C6Ar6 conjugated hydrocarbons, highly overcrowded systems.

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