Methanol → Triphenyl tin methoxide

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115.5 g of triphenyl tin chloride are dissolved in a mixture of 450 g of absolute methanol and 300 g of absolute tetrahydrofuran and mixed with a solution of 7.02 g of sodium in 150 ml of absolute methanol. After stirring for 2 hours at room temperature the resulting precipitate of sodium chloride is filtered off. The solution of triphenyl tin methoxide obtained is combined, accompanied by stirring, with a solution of 600 g of the epoxy resin modified with diketene described in Example 2 dissolved in 300 g of absolute tetrahydrofuran. After stirring for a further 2 hours at room temperature and after distilling off the solvent 696 g of a reddish brown glassy solid product of formula VI above are obtained. Tin content: calculated 5.51%; found 5.45%.

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