Communications
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[7] The isomers were assigned unambiguously by NMR spectros-
copy after desilylation (see the Supporting Information).
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[9] The ee was determined by chiral HPLC (see the Supporting
Information).
[10] a) T. Takahashi, H. Kotsubo, A. Iyobe, T. Namiki, T. Koizumi, J.
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