potassium hydroxide in ethanol (under Ar); mixt. of Sn-compounds diluted in EtOH added dropwise to soln. of KOH in EtOH at room temp. for 2 h; poured into H2O, extd. with CH2Cl2, extract washed with H2O, dried, concd., chromd. on Al2O3 with 1:6 CH2Cl2:C6H14;

potassium hydroxide in ethanol Sn-compound reacted with CH2I2 and KOH in EtOH at room temp.;