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Synthesis of tricyclic ring systems: [2+2] ketene addition reaction for preparation of tricyclic ketone, alcohol, and lactone derivatives

Özgür Yılmaz, Esen Yıldız Bekfelavi, Nermin Şimşek Kuş, Tuncay Tunç, and Ertan Şahin

Department of Chemistry, Faculty of Arts and Sciences Mersin University, Mersin, Turkey



Abstract: The addition of dichloroketene to 1,4-cyclohexadiene was examined. Dichloroketene, which was easily prepared from trichloroacetyl chloride and Zn–Cu, reacted with 1,4-cyclohexadiene in the presence of POCl3 to afford novel racemic products of single addition (5) and double addition (6). The adducts 6 and 7 were reacted separately with MCPBA (meta-chloroperbenzoic acid), H2O2, LiAlH4, and cis-diol 10 was reacted with PCC (pyridinium chlorochromate) to afford lactone, alcohol, and ketone derivatives likely to exhibit biological activity. The structures of all the racemic molecules mentioned in the article were determined from 1H NMR, 13C NMR, MS, and IR data.

Keywords: Ketene addition; Tricyclic molecules; Lactone; Ketone

Full paper is available at

DOI: 10.1007/s11696-016-0013-7


Chemical Papers 71 (5) 929–938 (2017)

Wednesday, March 29, 2023

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