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This behavior clearly contrasts with that described for 1,3-oxazolidines. See for example: Higashiyama, H.; Inoue, H.; Yamauchi, T.; Takahashi, H. J. Chem. Soc., Perkin Trans. 1 1995, 111.
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0345657449
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note
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*) in our benzoxazine radicals.
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35
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0000580536
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Crich, D.; Jiao, X.-Y.; Harwood, J. S. J. Org. Chem. 1996, 61, 2368, and references therein.
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36
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0344794651
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note
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Cyclization products 9d and 10d could not be separated by chromatography. The other diastereomers were isolated by flash chromatography, although many attempts to remove the residual organotins were not successful in some cases.
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