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Issue 7, 1990
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Citronellal cyclisation in superacids


The cyclisation of citronellal in superacids parallels closely the reaction in ‘normal’ acids, yielding iso-pulegol and neoisopulegol. Each alcohol then undergoes protonation at the double bond; neoiso-pulegol loses water to give 2-(4-methylcyclohex-1-en-1-yl)prop-2-yl cation, but in isopulegol this process is stereochemically unfavourable, and competes with a 1,5-hydride shift to yield the 1-methyl-4-isopropyl cyclohexenyl cation. Hydroxycitronellal yields only the 2-(4-methylcyclohex-1-en-1-yl)prop-2-yl cation by an unknown route.

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Article information

J. Chem. Soc., Perkin Trans. 2, 1990, 1275-1277
Article type

Citronellal cyclisation in superacids

C. Dean and D. Whittaker, J. Chem. Soc., Perkin Trans. 2, 1990, 1275
DOI: 10.1039/P29900001275

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