[SH:1][CH2:2][CH2:3][CH:4]([CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][CH3:13])[C:5]([O-:7])=[O:6].C(=O)(O)[O-].[Na+].CCCCCCC.[CH3:26][Sn:27](Cl)(Cl)[CH3:28]>O>[SH:1][CH2:2][CH2:3][CH:4]([CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][CH3:13])[C:5]([O-:7])=[O:6].[SH:1][CH2:2][CH2:3][CH:4]([CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][CH3:13])[C:5]([O-:7])=[O:6].[CH3:26][Sn+2:27][CH3:28]Into a 2 liter flask is placed 204 gm (1.0 mole) 2-mercapto-ethylcaprylate, 200 ml water, 84 gm (1.0 mole) sodium bicarbonate and 300 ml heptane. To the above stirred mixture is added dropwise, at 30°-40° C., 110 gms (0.5 mole) dimethyltin dichloride dissolved in 200 ml water. Stir for 1 hour at 30°-40° C. and allow the layers to separate. The organic layer is washed with 200 ml water and then stripped under vacuum at about 100° C. A yield of 273 gm of dimethyltin bis(2-mercaptoethyl caprylate) is obtained. nD25 1.5060.
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