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Effect of temperature and residence time in Br-Li exchange reaction of 4,4′-dibromobiphenyl (17) using the microflow system; (a) Plots of recovery of 17 against residence time, (b) Plots of yields of 18 and 3 against residence time. Flow rate of a solution of 4,4′-dibromobiphenyl (17): 6.00 mL·min−1, flow rate of n-BuLi/hexane: 1.20 mL·min−1, flow rate of methanol: 3.00 mL·min−1. Yields of 3, 17 and 18 were determined by GC.
