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Acknowledgements
We thank the National Science Council of the Republic of China for ®nancial support.
References
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16. The acid-catalyzed esteri®cations of (2S,3S)- and (2R,3R)-tartaric acids with (^)-8-phenylmenthol were conducted
in re¯uxing benzene with azeotropic removal of water to give, respectively, the authentic samples of 8 and its
(2R,3R)-diastereomer.
17. All the new compounds are characterized by spectral methods (IR, MS, HRMS, 1H and 13C NMR). Compound 9:
26
D
26
D
ꢀ ^2.5 (CHCl3, c=1.2). Compound 10: ꢀ +7.0 (CHCl3, c=1.0).
18. The crossed pinacolic coupling reaction of (^)-8-phenylmenthyl pyruvate and acetone was also carried out by
treatment with acidic TiCl3 aqueous solution. Chen, M.-Y., Ph.D. Thesis, National Taiwan University, 1991.