“…Because Al(OTf)3 can act as a strong L acid site during GLY conversion, it was assumed that the aluminum cation preferentially coordinated with the hydroxyl group. 1 H NMR examinations can detect complex formation and have been used to investigate the complexation between metal sites and inactivated alcohols [44,45]. Thus, we carried out 1 H NMR studies on the complexation of Al(OTf)3 to GLY to determine whether the aluminum cation coordinated with both the hydroxyl oxygen atoms.…”