Tellurium 40 mesh

Example 2

3.19 g (25 mmol) of metal tellurium (trade name: Tellurium (−40 mesh), manufactured by Aldrich Corporation) was suspended in 25 ml of THF. 17.2 mL (27.5 mmol) of n-butyllithium (manufactured by Aldrich Corporation, 1.6 M hexane solution) were gradually added dropwise to the obtained suspension at 0° C. (for 10 minutes). The obtained reaction solution was stirred until the metal tellurium was completely dissolved (for 10 minutes). Next, 20 mL of ammonium chloride solution were added at room temperature and stirred for 1 hour. After completion of the reaction, the organic layer was separated and the water layer was extracted 3 times with diethyl ether. The collected organic layer was dried with anhydrous sodium sulfate and then concentrated under reduced pressure, thereby obtaining 4.41 g (11.93 mmol; yield: 95%) of a grape oily substance of DBDT.

Example 1

6.38 g (50 mmol) of metal tellurium (trade name: Tellurium (−40 mesh), manufactured by Aldrich Corporation) was suspended in 50 ml of THF. 34.4 mL (55 mmol) of n-butyllithium (manufactured by Aldrich Corporation, 1.6 M hexane solution) were gradually added dropwise to the obtained suspension at room temperature (for 10 minutes). The obtained reaction solution was stirred until the metal tellurium was completely dissolved (for 20 minutes). Next, 10.7 g (55 mmol) of ethyl-2-bromo-isobutyrate were added at room temperature and stirred for 2 hours. After completion of the reaction, the solvent was concentrated under reduced pressure, and subsequently, was distilled under reduced pressure, thereby obtaining 8.98 g (yield: 59.5%) of a yellow oily substance of BTEE.