2: KOH / ethanol View Scheme

potassium hydroxide in ethanol

in benzene

in benzene mixt. of In(III) isopropoxide and thio-Schiff base (molar ratio 1:2) in dry benzene refluxed under fractionating column for 5 h in oil bath at 110°C; benzene removed under reduced pressure, recrystd. from hexane and benzene (1:1), elem. anal.;

1: KOH / ethanol 2: 75 percent / t-BuOK / benzene / 1 h / Heating 3: 68 percent / m-CPBA / CH2Cl2 / 1 h / -78 °C 4: 60 percent / (CF3CO)2O / CH2Cl2 / 1 h / -78 °C View Scheme