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Synthesis of phenol precursors 13a – 13c for radiolabeling. Reagents and conditions: (a) Cu, K2CO3, 1-pentanol, reflux; (b) Zn, NH4Cl, MeOH, rt; (c) EDCHCl, CH2Cl2, room temperature; (d) TiCl4, 1,4-dioxane, 1-ethylpiperazine, reflux; (e) BBr3, CH2Cl2, 0°C to room temperature.
