1: 92 percent / gaseous HCl / Ambient temperature 2: tetrahydrofuran / Ambient temperature 3: 1) CH3SO3H, 2) 25percent NaOH / 1) acetic acid, rt View Scheme

1: tetrahydrofuran / Ambient temperature 2: 1) CH3SO3H, 2) 25percent NaOH / 1) acetic acid, rt View Scheme