Water → 1,5-Diphenylpentane-1,5-diol

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While cooled by an ice-bath and stirred intensely, 0.0 mol 1,5-diphenyl-1,5-pentandione was added dropwise slowly to a mixture of 3 g LiAlH4 and 100 ml anhydrous tetrahydrofuran. The mixture was heated refluxing for 5 hours, then cooled. Excess LiAlH4 was decomposed with water. After mixing completely the reaction mixture with ethyl acetate, the mixture was filtered, and the filtrate was dried over anhydrous sodium sulfate. The solvent was removed. Column chromatography gave 1,5-diphenyl-1,5-pentanediol as a white solid, and the yield was 85%. mp: 64-67° C. IR spectrum had a strong —OH absorption peak at 3400 cm−1, and had no —CO— absorption peak at about 1700 cm−1. This demonstrated that the reduction reaction was carried out completely.

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