NaOH in water addn. of solution of benzene-1,2-dithiol and sodium hydroxide in nitrogen-purged water to a solution of methyltin trichloride in water (using trichloride : benzenedithiol = 7.0mmol : 4.6mmol; same product was obtained on using 1:1 ratio);; recrystn. from dichloromethyn/n-hexane mixture;;