12. Natural (2)-menthol, the essential oil primarily responsible for the flavor and aroma of peppermint, is the 1R,2S,5R-stereoisomer. (a) Identify (2)-menthol from the structures you drew for Problem 50, part (b). (b) Another of the naturally occurring diastereomers of menthol is (1)-isomenthol, the 1S,2R,5R- stereoisomer. Identify (1)-isomenthol among your structures. (c) A third is (1)-neomenthol, the 15,2S,5R-compound. Find (1)-neomenthol among your structures. (d) Based on your understanding of the conformations of substituted cyclohexanes (Section 4-4), what is the stability order (from most stable to least) for the three diastereomers, menthol, isomenthol, and neomenthol?

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