Robert E. Lylea; Brian P. Coppolab; Jose E. Saavedrab; Gloria G. Lylec. SELECTIVE REACTIVITY OF THE BISENAMINE OF PIPERAZINE-CYCLOHEXANONE WITH BENZOYL CHLORIDE // Organic Preparations and Procedures International, Volume 10, Issue 6 December 1978 , pages 304 - 306
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http://dx.doi.org/10.1080/00304947809355058