HCl in methanol
MeOH soln. of thioacetic acid added to MeOH suspn. of (CH3)2SnO, stirredfor 30 min at 18°C, MeOH soln. of HCl added, stirred for 4 h; solvent evapd. under reduced pressure, residue extd. with CHCl3, filtered, solvent evapd. under reduced pressure, dried under vac. for 2 h, recrystd. from CHCl3; elem. anal.;