Base Solvent Conversion (%) 38 Ph [a] Conditions: benzyl alcohol (1.0 mmol), aniline (1.2 mmol), KO t Bu (1.3 mmol), solvent (6 mL), molecular sieves (4 Å), 25°C, open reaction vessel, 3 h, conversion determined by GC-MS, isolated yield given in parenthesis. 24h. Furthermore, we examined whether catalytic amounts of KO t Bu are sufficient for this transformation as described by several researchers under more forcing conditions. If 30 mol% of KO t Bu are used in the model reaction under O2-atmosphere, a turnover number of approx. 2.2 was observed, which proves that the reaction can in general be operated in a catalytic fashion. Scheme 2. O-Labeling experiment for the base/oxygen promoted synthesis of imines.