“…[6][7][8] In contrast, as far as we are aware, ring-forming reactions of bromoallenes have scarcely been studied. [9] This Communication is based on a new finding that the bromoallene 1 can act as allyl dication equivalent 4 when treated with palladium(0) in an alcohol solvent, presumably by the mechanism shown in Scheme 1. [10] Although similar types of reaction are often observed with propargylic carbonates in the presence of a palladium catalyst and a soft nucleophile such as active methylene, aryl alcohols, or amides, [10,11] the reaction of allenic substrates and the synthesis of eight-membered rings are unprecedented.…”