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NOE analysis of the product provided no evidence for the interaction of the hydrogens of the phenyl ring with those of the mesityl group; see the Supporting Information
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NOE analysis of the product provided no evidence for the interaction of the hydrogens of the phenyl ring with those of the mesityl group; see the Supporting Information.
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26
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0025802764
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We were aware that lithiation of a 5-iodoisoxazole isomer may well result in ring decomposition.;;;, However, given the yield and purity of crude products 4 and 22, we believe that this implies excellent regioselectivity in the preceeding cycloaddition
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We were aware that lithiation of a 5-iodoisoxazole isomer may well result in ring decomposition. Sakamoto, T.; Kondo, Y.; Uchiyama, D.; Yamanaka, H. Tetrahedron 1991, 47, 5111 However, given the yield and purity of crude products 4 and 22, we believe that this implies excellent regioselectivity in the preceeding cycloaddition.
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77955140173
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1H NMR spectra of some of the products contain a <5% impurity, which could not be separated and characterized but may be a minor regioisomer
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1H NMR spectra of some of the products contain a <5% impurity, which could not be separated and characterized but may be a minor regioisomer.
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28
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We believe that the regioselectivity is determined by steric effects. For a list of appropriate "A-Values", see:;;;, Eds.; Wiley-Interscience: New York,; pp - 697
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We believe that the regioselectivity is determined by steric effects. For a list of appropriate "A-Values", see: Stereochemistry of Organic Compounds; Eliel, E. L.; Wilen, S. H.; Mander, L. N., Eds.; Wiley-Interscience: New York, 1994; pp 696 - 697.
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