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Magnesium (0.84 g, 34.6 millimol) was suspended in tetrahydrofuran (30 ml), and thereto was added a small amount of iodine. Under nitrognen atomosphere, a solution of 2-bromo-5-t-butyldimethylsilyloxymethyltoluene (10 g, 31.6 millimol) in tetrahydrofuran (10 ml) was added. When the mixture was heated for some time, the reaction was started, and heat genetated. After stirring for 2 hours as it was, m-methylbenzaldehyde (3.16 g, 26.3 millimol) was added. After stirring for 2 hours, to the mixture was added saturated aqueous ammonium chloride solution, and the mixture was extracted with ethyl acetate. The organic layer was washed with water, dried over anhydrous sodium sulfate, and the solvent was distilled away under reduced pressure. The residue was separated and purified by using a silica-gel column chromatography (ethyl acetate:n-hexane=1:6) to give the title compound (6 g, 16.8 millimol, 64%).

1. temperatureWhen the mixture was heated for some time
2. temperatureheat
3. stirringAfter stirring for 2 hours, to the mixture
4. extractionthe mixture was extracted with ethyl acetate
5. washThe organic layer was washed with water
6. dry with materialdried over anhydrous sodium sulfate
7. distillationthe solvent was distilled away under reduced pressure
8. customThe residue was separated
9. custompurified