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Experiments were conducted using commercial di-n-butylboron triflate (1.0 M solution in dichloromethane). Each bottle of reagent was assayed (1.5 mmol scale) employing our standard reaction conditions using 4b and 5 to ensure consistency. Preparation of boron triflate in situ was not examined.
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This result contrasts with earlier observations on the regiochemistry of lithium hydroxide hydrolysis. See Evans, D. A.; Britton, T. C.; Ellman, J. A. Tetrahedron Lett. 1987, 28, 6141.
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