methanol; hydrogen fluoride; boron trichloride; trifluoroacetic acid 1.) CH2Cl2, 2.) room temperature, 1 h, 3.) 24 h; Yield given. Multistep reaction;

boron trifluoride diethyl etherate 1.) CH2Cl2, rt, 24 h, 2.) H2O, CH2Cl2; Yield given. Multistep reaction. Yields of byproduct given;