Table 2. Scope of Alkynes in Hydrosilylation with Phenylsilanea.
| entry | R | yield [%] (isolated) | selectivity α:β | selectivity α:α,α |
|---|---|---|---|---|
| 1 | Ph (3a) | 99 (98) | >99:1 | 79:21 |
| 2 | 4-t-BuC6H4 | 99 | >99:1 | 100:0 |
| 3 | 4-BrC6H4 | 38 | >99:1 | 97:3 |
| 4 | 4-MeOC6H4 | 99 | >99:1 | >99:1 |
| 5 | 4-NH2C6H4 | 99 | >99:1 | >99:1 |
| 6 | 4-MeC6H4 | 99 | >99:1 | 97:3 |
| 7 | 3-MeC6H4 (3g) | 99 (94) | >99:1 | 91:9 |
| 8 | 2-MeC6H4 (3h) | 99 (99) | >99:1 | 91:9 |
| 9 | Cyclopropyl | 99 | >99:1 | 91:9 |
| 10 | PhCH2 | 93 | >99:1 | 97:3 |
a
Conditions: alkyne (1 mmol), phenylsilane (1 mmol), 1 (0.05 mol %), LiHBEt3 (0.15 mol %), 40 °C, 20 h. Product ratio and reaction yield determined by GC.