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A solution of 5.4 g (44 mmol) of thioanisole and 4.89 g (43.6 mmol) of 1,4-diazabicyclo[2,2,2]octane in 44 ml of tetrahydrofuran was placed in an oven-dried flask and cooled to 0° C. A 2.5 M solution of butyl lithium in hexane (17.4 ml, 43.6 mmol) was added with stirring and the mixture allowed to warm to room temperature and react for about 1 hour to form phenylthiomethyl lithium. A solution of 3.14 g (8.71 mmol) of 1-(2-methoxymethoxyphenyl)-1-(3,4-dimethoxy-2-methoxymethoxyphenyl)ethene in tetrahydrofuran was added and the mixture heated to reflux with stirring under an argon atmosphere After 10 hours another 21 8 mmol of phenylthiomethyl lithium was prepared and added to the mixture and refluxing was continued overnight. The mixture was then cooled and poured into 200 ml of 5 percent aqueous sodium hypochlorite solution and 200 g of ice and 150 ml of ether added. The organic phase was separated, dried over magnesium sulfate and concentrated by evaporation under reduced pressure to obtain 6.61 g of an oil. This was purified by silica gel chromatography (80 mm×3" filter funnel), eluting with hexane containing ever increasing amounts of ether to obtain 1.16 g of the title compound as an oil. The proton and carbon NMR and infrared spectra were consistent with the assigned structure.

1. temperatureto warm to room temperature
2. customreact for about 1 hour