The tricarbonyl(2-menthoxy-5-methylcyclohexadienylium)iron hexafluorophosphate (4) prepared from p-menthoxytoluene can be obtained as a single diastereoisomer and displays excellent regioselectivity with a model nucleophile providing a route to homochiral 4-substituted 4-methylcyclohex-2-enones; other related homochiral synthons are also prepared.
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Potter et al. (1990) studied this question.
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