). Desolvated Mn(OAc)-MFU-4l (0.060 g, 0.046 mmol, 1.0 equiv.) was suspended in a solution of calcium chloride (0.10 g, 0.92 mmol, 20 equiv.) in 15 mL of methanol at room temperature for 1 day. The supernatant was decanted, and the residual solid was suspended in a fresh second solution of calcium chloride (0.10 g, 0.92 mmol, washed with ~15 mL of methanol at room temperature for 3 h four times. The resultant beige powder was activated under dynamic vacuum at 180 °C for 24 h to afford 0.053 g (95%) of product as a microcrystalline beige solid or used directly in the subsequent metal exchange reaction.