Benzoyl substituted allenes in Brønsted superacid TfOH at room temperature afford Nazarov cyclization products, E-/Z-alkylidene indanones. In TfOH at a higher temperature of 70 °C, allenes bearing geminal benzoyl and phenyl substituents undergo further transformations, yielding fused indano–indanones. The latter have been used as precursors in the stereoselective synthesis of the structural analogue of the natural compound, Pallidol.