Following a modified version of a reported procedure, 5 to a solution of cyclopropylamine (0.70 mL, 10 mmol, 1.1 equiv.) and triethylamine (1.40 mL, 10.0 mmol, 1.1 equiv.) in dichloromethane (10 mL) was slowly added a solution of 4-methylbenzoyl chloride ( ) 09 mmol) in dichloromethane (10 mL) at 0 o C. The reaction mixture was stirred at room temperature for 16 hours. Upon completion, the mixture was quenched by the addition of 1 N HCl (10 mL). The aqueous layer was then extracted with dichloromethane. The organic extract was washed with 1 M NaOH (10 mL) and brine (10 mL), dried over Na2SO4, filtered and concentrated in vacuo. The crude product 5a was pure enough to be used as such, without further purification. 1 H NMR (400 MHz, CDCl3): δ = 7.72 -7.55 ). 1 H NMR data correspond to the reported values. 6 Synthesis of hypervalent iodine reagents . Consistent with reported data 7