Provide the reagent(s) necessary to carry out the following conversion.
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Mechanisms: (25 pts) Provide a mechanism for one of the following reactions. Use the curved arrow formalism. Be as explicit as possible. If the mechanism of some particular step is not known, just write the reagent. Briefly address issues of stereospecificity, regiochemistry, stereochemistry and stoichiometry as they may apply.
Cite each figure, table and movie in the text in numerical order. Figure or table parts should be labelled with uppercase letters (A, B, C, etc.). Use the following format for citations: Fig. 1A,B or Figs 1, 2 or Table 1 or Movie 1. If necessary, display equations should be cited using the following format: Eqn 1.