Scheme 3. Application of tetrafluoroborate activation to other ligand classes for alkene hydrosilylation (top). Reaction conditions: (a) xantphos or dppf (1 mol%), Co(BF4)2·6H2O (1 mol%), 1-octene (1 mmol), phenylsilane (1.1 mmol), THF (2 M), r.t., 4 h. (b) Adamantyl isocyanide (9 mol% [Co] or 6 mol% [Fe]), metal tetrafluoroborate (3 mol%), α-methylstyrene ([Co], 1 mmol) or styrene ([Fe], 1 mmol), phenyldimethylsilane (1.3 mmol), THF (2 M), 80 °C, 3 h. (c) iPrIP (5 mol%), Fe(BF4)2·6H2O (5 mol%), myrcene (1 mmol), triethoxysilane (1.2 mmol), THF (2 M), r.t., 16 h. (d) Alkene (1 equiv.), Co(BF4)2·6H2O (0.5 mol%), MesBIP (1 mol%), PhSiH3 (5 mol%), H2 (20 bar), r.t., 7 h. ‡Alkene (1 equiv.), Fe(BF4)2·6H2O (2 mol%), MesBIP (2 mol%), PhSiH3 (5 mol%), H2 (20 bar), r.t., 7 h. §Co(BF4)2·6H2O (1 mol%) and MesBIP (1 mol%). (e) 1,6-Diene (1 equiv.), EtBIPCo(BF4)2·6H2O (10 mol%), PhSiH3 (20 mol%), 80 °C, 24 h. (f) Arene (15 equiv.), (4-NMe2-Ph-terpy)Co(BF4)2 (5 mol%), PhSiH3 (20 mol%), LiOMe (1 equiv.), B2pin2 (1 equiv.), 80 °C, 24 h.
