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(32) This is indeed what was found experimentally. When S1 was
mixed with IM1 for 40 min at room temperature, 70% conversion was
obtained with 80% P-BF2, 20% P-BFR, and only traces of P-BR2.
When instead 1 was mixed with IM1 under the same conditions, 92%
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(34) The low yields observed in this case can be attributed to the fact
that several purifications by column chromatography were required to
obtain 8b and 8c as clean products.
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dx.doi.org/10.1021/ja501805r | J. Am. Chem. Soc. XXXX, XXX, XXX−XXX