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The stereochemistry-determining step and origin of selectivity in EAS with allenyl–B(pin) (see Schemes 13 and 19 for methodology). Reactions performed under N2 atm.; conv. (±2%) determined by analysis of the 1H NMR spectra of the unpurified product mixtures; yields (±5%) are for purified products. Previously unpublished KIE data and DFT analysis; see the Supporting Information for details.
