[OH-].[Na+].[CH3:3][Sn:4](Cl)(Cl)[CH3:5].C[Sn](Cl)(Cl)Cl.[CH2:13]([CH:21]([SH:25])[C:22]([O-:24])=[O:23])[CH2:14][CH2:15][CH2:16][CH2:17][CH:18]([CH3:20])[CH3:19]>O>[CH2:13]([CH:21]([SH:25])[C:22]([O-:24])=[O:23])[CH2:14][CH2:15][CH2:16][CH2:17][CH:18]([CH3:19])[CH3:20].[CH2:13]([CH:21]([SH:25])[C:22]([O-:24])=[O:23])[CH2:14][CH2:15][CH2:16][CH2:17][CH:18]([CH3:19])[CH3:20].[CH3:3][Sn+2:4][CH3:5]A suitable reaction vessel was charged with 14.48 grams (0.362 mole) of sodium hydroxide dissolved in 80 ml water. A solution of 28.77 grams (0.131 mole) of dimethyltin dichloride and 7.92 grams (0.033 mole) of monomethyltin trichloride was added at a rate sufficient to maintain the exothermic reaction mixture at or below 75° C. Then, 75.1 grams (0.362 mole) isooctylthioglycolate was added and reacted. After separating off the aqueous phase, the oily product phase was vacuum stripped and filtered to yield 100 grams of a 75% dimethyltin bis(isooctylthioglycolate)/25% monomethyltin tris(isooctylthioglycolate) mixture.
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