diazomethane; formic acid; dihydrogen peroxide; ozone 1.) ozone, -70 deg C, 2.) hidrogen peroxide, formic acid, 3.) diazomethane, methanol, 0 deg C; Yield given. Multistep reaction;

potassium tert-butylate in tetrahydrofuran T=20°C; Yield given. Yields of byproduct given;