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15044338525
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note
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1H NMR), which is consistent with the [1,3]-chirality transfer of the allyl cyanate-to-isocyanate rearrangement.
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Although allyl cyanates such as A (Figure 7) have been considered to be possible intermediates in the reaction, there is also some experimental evidence of their involvement. See: a) K. Banert, Angew. Chem. 1992, 104, 865; Angew. Chem. Int. Ed. Engl. 1992, 31, 866;
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Although allyl cyanates such as A (Figure 7) have been considered to be possible intermediates in the reaction, there is also some experimental evidence of their involvement. See: a) K. Banert, Angew. Chem. 1992, 104, 865; Angew. Chem. Int. Ed. Engl. 1992, 31, 866;
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note
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For the inherent ring strain imposed by the trans-acetonide group, only the substitution product i was isolated by deprotection of the o-nosyl amide in 25. diagram presented
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