One formidable challenge in sp C-H activation is how to achieve high para selectivity on electron-deficient arenes because such site selectivity is disfavored by the electronic bias induced by the electron-withdrawing groups. The first highly selective para-C-H acetoxylation of various benzoic acids using a nitrile-based template was realized. Removal of the template leads to para-hydroxylated benzoic acids, which are versatile intermediates for a wide range of synthetically useful transformations.
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| http://dx.doi.org/10.1021/acs.orglett.8b03871 | DOI Listing |
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