Table 2. Titanium-Catalyzed Hydroboration of Alkynes with HBpin^d.

^aIsolated yield.

^bRatio of regioisomers was determined by ¹H NMR spectroscopy.

^cThe yield was calculated by ¹H NMR (400 MHz) integration of characteristic product signal present in the reaction mixture.

^dReaction conditions: catalyst 1 (1 mol %), alkynes (1 equiv), HBpin (1.1 equiv), in toluene at rt.