Table 2.

Hydrosilylation of Ketones Catalyzed by Various Boron Reagents.^a

entry	1 (equiv)	Lewis base (equiv)	Et3SiH (equiv)	time	yieldb 6a (%)	yieldb 7a (%)
1	0	–	1.5	6 h	0	0
2	0.1	–	1.5	10 min	69	0
3	0.1	DABCO (0.1)	1.0	12 h	0	0
4	0.1	2,6-lutidine (0.1)	1.5	30 min	<5	95
5	0.05	2,6-lutidine (0.05)	1.5	20 h	<5	69

^aReactions were performed at room temperature in an NMR tube (see Supporting Information for details).

^bYields determined by integration of product signals versus Cl₃CCH₂Cl as an internal standard.