1: 2.) NaBr, polyethylene glycol-400 / 2.) CH3CN, 80 deg C, 6 h 2: 1.) piperidine, acetic acid, HCl, H2O, tricresyl phosphate, 2.) P2O5, 2,6-di-(tert-butyl)p-cresol / 1.) cyclohexane, reflux, 1 h, 2.) 170-211 deg C, 0.5-1.0 mm Hg View Scheme

(i) piperidine, aq. NaOH, benzene, (ii) P2O5, SnCl2, benzene-1,4-diol; Multistep reaction;