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the four H's at 2.8 δ, which appear as a triplet because they are split by two H's. Therefore, the fragment can be identified. Attaching this fragment to two positions of a benzene ring indicates that compound B is indan. The reaction that produces B from A is an intramolecular Friedel-Crafts alkylation reaction. + + Cl: A + H B indan H 17.67 The product, which results from three Friedel- C Crafts alkylation reactions, is triphenylmethane. 17.68 Br Br Br Br FeBr₃ Br + Br₂ + + Br Br A B C 17.69 As the steric bulk of the alkyl group increases, less ortho product will be formed. The order is toluene > ethylbenzene > isopropylbenzene > 282