in further solvent(s) addn. of Sn compd. to iso-butanol, reflux, acid or base catalysis;

in further solvent(s) addn. of C6H8O4Sn to iso-butanol, suspn. mixed thoroughly, dropwise addn. of concd. HCl until C6H8O4Sn was consumed, water and alcohol removed by heating; purifn. by vac. distn.; elem. anal., mass spectroscopy;