Table 2. Optimization of Hydroboration Catalysis^a.

entry	catalyst loading (mol %)	T (°C)	borane source (equiv)	yieldb	time (h)
1	0	25	HBpin (1.2)	<5%	24
2	5	25	HBpin (1.2)	<5%	24
3	10	25	HBpin (1.2)	<5%	24
4	0	70	HBpin (1.2)	<5%	24
5	5	70	HBpin (1.2)	68%	24
6	10	70	HBpin (1.2)	>95%	6
7c	10	70	HBpin (1.2)	>95%	6
8	10	70	HBpin (1.0)	85%	24
9	10	70	HBcat (1.2)	<5%	24
10	10	70	9-BBN (1.2)	<5%	24

^aAcetophenone (0.2 mmol, 24 mg).

^bConversion determined by ¹H NMR spectroscopy with internal mesitylene standard (0.1 mmol, 14 mL).

^cBenzene-d⁶ solvent instead of CDCl₃.