Ene reactions hydrogen

Asymmetric Oiels-Alder reaction, ene reaction, hydrogenation, halogenatlon by means of chiral olelln, such as camphor derivative 1 or 2. 

Citronellal can be cyclized to /io-pulegol by means of the ene reaction. Hydrogenation of the /io-pulegol thus formed then gives menthol. Using J-citroneUal (171) with appropriate reagents and conditions leads to /-menthol (42) as shown in Fig. 8.36. Originally, the J-citroneUol was extracted from Citronella oil, but material produced from myrcene... 

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See also in sourсe #XX -- [ ]

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