1: 88 percent / anhydrous hydrogen chloride 2: 1,2-dimethoxy-ethane / Ambient temperature 3: 1) CH3SO3H, 2) 25percent NaOH / 1) acetic acid, rt, 2) TFA, 48percent H2SO4 View Scheme

1: 1,2-dimethoxy-ethane / Ambient temperature 2: 1) CH3SO3H, 2) 25percent NaOH / 1) acetic acid, rt, 2) TFA, 48percent H2SO4 View Scheme

sodium hydroxide; methanesulfonic acid 1) acetic acid, rt, 2) TFA, 48percent H2SO4; Yield given. Multistep reaction;