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0000247369
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For a similar inducing effect of the 2-hydroxy group in the oxidation, please see: Yang, T.-K.; Chen, R.-Y.; Lee. D.-S.; Perng. W.-S.; Jiang. Y.-Z.; Mi, A.-Q.; Jong, T.-T. J. Org. Chem., 1994, 59, 914.
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note
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The X-ray crystallographic studies of the cycloadducts of endo-(Re)-6a and exo-(Si)-9a supported the stereochemistry that we proposed. Based on the precedent and our hypothesis, exo-(Re)-8a was the least possible product which could easily be differentiated from the highly predominated cycloadduct 7a.
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note
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Crystal data of endo-(Re)-6a and exo-(Si)-9a are supplied as supplementary material. The atomic coordinates have been deposited in Cambridge Cristallographic Data Centre.
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85030004947
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note
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3) δ 11.31, 21.14, 22.31, 28.95, 32.99, 33.76, 43.99, 46.32. 47.27, 47.65. 48.41. 49.72, 52.47, 72.03, 72.99, 81.00, 133,40, 141.20, 170.28.
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