To evaluate the recyclability of MgCrO, two reactivation processes were applied to the material. In the first one, after separating the material from the reaction mixture, the material was dried at 100 °C for 24 h. The second process included calcination at 500 °C for 5 h in an O2 atmosphere. After the first reuse, we observed that the catalyst that was reactivated at a high temperature (500 °C) retained its activity, so the reactions still proceeded in high yield (90%). MgCrO can be recycled at least three times without significant losses in catalytic activity (Fig. ). This result contrasts with that observed when the MMO was only dry at 100 °C, where the yield decreased significantly as a consequence of the loss of catalytic activity of MgCrO. This significant difference is probably due to the presence of organic material at the catalytic sites, which is eliminated after calcination at 500 °C to recover the catalytic properties of the MMO (Fig. , red column, yield 87%).