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Reagents and conditions: (a)527 Cp2ZrCl2, THF, −78 °C, then n-BuLi, overnight; (b) (1) CuI, 0 °C, 20 min, (2) PhPCl2, −78 °C, 15 h; (c) S8, DCM, rt, 5 h; (d) I2, propylene oxide, toluene, hν (mercury vapor lamp), 20 h; (e) FeCl3, DCM.
