acetyl chloride in acetone 1 h; Heating / reflux;

air; 18-crown-6 ether; potassium tert-butylate 1.) THF, -68 deg C, 2.) overnight; Yield given. Multistep reaction. Further byproducts given. Yields of byproduct given;

18-crown-6 ether in tetrahydrofuran 1 h; Ambient temperaturemultistep reaction; other times; also with KOH or t-BuOK; in the presence of air; Product distributionMechanism;

oxygen 4 h; Irradiationvar.: solvent (CH2Cl2); Product distribution;