Kenso Soai, Hiroshi Hayashi, and Hitoshi Hasegawa. Synthesis of (2S,5S)-2,5-Bis(phenylmethyl)piperazine by the Reduction with Sodium Borohydride Using Titanium Tetrachloride. Heterocycles Volume 24, Issue 5 ( May, 1, 1986 ), Pages 1287-1289
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