[C:1]([OH:5])([CH3:4])([CH3:3])C.[C:6]([CH2:9][C:10](=[O:12])[CH3:11])(=[O:8])[CH3:7].Br[CH2:14][C:15]1[CH:20]=[C:19]([C:21]([CH3:24])([CH3:23])[CH3:22])[CH:18]=[C:17]([CH2:25]Br)[CH:16]=1.[I-].[K+].[CH2:29]([O:31]CC)[CH3:30]>O>[C:21]([C:19]1[CH:18]=[C:17]([CH2:25][CH:3]([C:29](=[O:31])[CH3:30])[C:1](=[O:5])[CH3:4])[CH:16]=[C:15]([CH2:14][CH:9]([C:10](=[O:12])[CH3:11])[C:6](=[O:8])[CH3:7])[CH:20]=1)([CH3:24])([CH3:23])[CH3:22]
In a four-neck flask having a capacity of 500 mL, 19.6 g (175 mmol) of t-butokypotassium and 300 mL of t-butylalcohol were put in, agitated at a temperature of 82° C. for 30 minutes, dropped with 26.5 g (262 mmol) of acetylacetone at the temperature for 12 minutes, and then agitated for 2 hours. Thereafter, at 81 to 83° C., 25.0 g (87.3 mmol) of 1,3-bis(bromomethyl)-5-t-butylbenzene was added for 30 minutes, and then agitated for 1 hour. Thereafter, 3.49 g (21.0 mmol) of potassium iodide was added at 82° C., and then agitated for 3.5 hours. After the solution was cooled down to a room temperature, it was added with 100 mL of diethylether, and 115 mL of water to be subjected to an extraction operation, and then an organic layer was separated from a water layer. The organic layer obtained was added with 30 mL of saturated aqueous salt solution and agitated, and then an organic layer was separated from a water layer, dried with anhydrous sodium sulfate, and then concentrated by distilling off the solvent to obtain a crude product. The crude product obtained was purified with a silica gel column chromatography to obtain 21.9 g (yield 69%) of 3,3′-[5-t-butyl-1,3-phenylenebis(methylene)]bis(2,4-pentanedione)
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