potassium tert-butylate in cyclohexane T=-10°C; 1 h;

sodium hydroxide in diethyl ether T=40°C; 28 h;

sodium hydroxide; N-benzyl-N,N,N-triethylammonium chloride in ethanol; dichloromethane T=30°C; 0.416667 h; ultrasound cleaner; Yield given. Yields of byproduct given. Title compound not separated from byproducts;