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Synthesis 2001; 2001(1): 0052-0054
DOI: 10.1055/s-2001-9762
short paper
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Cyclization of Citronellal to Menthone and Isomenthone Catalyzed by Al/Fe-Pillared Clays

Maria Rita Cramarossa* , Luca Forti, Ugo Maria Pagnoni, Maurizio Vidali
  • *Dipartimento di Chimica, Università di Modena e Reggio Emilia, Via Campi 183, 41100 Modena, Italy; Fax +39(59)37 35 63; E-mail: forti.luca@mail.unimo.it
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Publication Date:
31 December 2001 (online)

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The cyclization of citronellal to a mixture of menthone and isomenthone (2:1) is catalyzed by Al/Fe-Pillared Clay (Al/Fe-PILC) at 80°C in 1,2-dichloroethane in good yield. At room temperature the products are isopulegol and neo-isopulegol, the isomer ratio depending on the reaction conditions.

catalysis - terpenoids - cyclizations - natural products - Lewis acids

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