cesium fluoride; methyl trifluoromethanesulfonate 1) CH2Cl2, 25 degC, 1 h, 2) dimethoxyethane, overnight; Yield given. Multistep reaction. Yields of byproduct given;

cesium fluoride; methyl trifluoromethanesulfonate 1) CH2Cl2, 25 degC, 1 h, 2) dimethoxyethane, overnight; Yield given. Multistep reaction. Yields of byproduct given;