and a 93% isolated yield of 3aa (entry 7 and Scheme 1). We presumed that the elevated temperature promoted the bimolecular Friedel-Crafts reaction above a unimolecular elimination pathway. a Reactions on a 0.20 mmol scale. b Yields calculated by analysis of the 1 H NMR spectrum of the crude reaction mixture using 1,3,5-trimethoxybenzene as internal standard. c Reaction run at 60 °C. d Reaction run at 110 °C.