Evidence for the formation of a new five-membered ring cyclic allene: Generation of 1-cyclopenta-1,2-dien-1-ylbenzene

Treatment of 1-(2-iodocyclopent-1-en-1-yl)benzene (13), dissolved in benzene, with potassium t-butoxide resulted in the formation of 1-(2-phenylcyclopent-1-en-1-yl) benzene (15) and 1-cyclopent-l-en-1-ylbenzene (5) in a ratio of 1:1