摘要：

The reductive coupling of (R)-(+)-carvone by TiCl4-Mg-tBuOH leads to (+)-(1S, 5R, 1′S, 5′R)-carvone pinacol 3 (70 %). In presence of pentane, (−)-(1R, 5R 1′R 5′R)-carvone pinacol 4 (50 %) and ketol 5 (15 %) are isolated. Isoborneol (58 %) and borneol (32 %) result of the reduction of (+)-camphor with the same reagent.

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