Table 1. Catalyst Screening for CO Oxidation by N₂O^a–^d.

^aAll reactions were conducted in a 90 mL Fisher-Porter tube using the catalyst (0.01 mmol), t-BuOK (0.01 mmol), 3.7 mmol of CO, and 7.4 mmol of N₂O in 4 mL toluene.

^bThe catalyst and t-BuOK were premixed in the solvent for 20 min and used directly for the reactions.

^cThe TONs are based on the generated CO₂ as measured by GC of the gas phase calibrated by a standard curve.

^dThe amount of CO₂ dissolved in toluene was not determined.^13,14

^eThe reaction was conducted in THF at 70 °C.

^fThe amount of CO₂ dissolved in THF was determined as ca. 0.4 mmol (40 TON).¹³