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Reagents and conditions: (a)373n-BuLi, Et2O; (b) UV irradiation (Hg medium pressure lamp), I2, propylene oxide, cyclohexane; (c) (1) excess neat BBr3, (2) MesMgBr, toluene/THF; (d) (1) [n-Bu4N]F, THF, (2) (PPh3)Ru(cymene)Cl2, NH4PF6, (CH2Cl)2.
