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. Author manuscript; available in PMC: 2018 Mar 15.
Published in final edited form as: J Am Chem Soc. 2017 Mar 1;139(10):3868–3875. doi: 10.1021/jacs.7b00445

Scheme 4. Scope of the 1,1-Diboration of Terminal Alkynes with B2Pin2 and (CyAPDI)CoCH3 (1)a.

Scheme 4

aReaction conditions: alkyne 2 (0.50 mmol), B2Pin2 (0.50 mmol, 1.0 equiv), 1 (0.025 mmol, 5 mol %), toluene (0.5 mL), 23 °C. Numbers in parentheses are yields of isolated products obtained after purification by flash chromatography on silica gel. b0.25 mmol 2, 0.25 mmol 3, 10 mol % 1. c2.0 equiv 3. d4.0 equiv 3. e1.5 equiv 3. fThermal ellipsoids at 50% probability.