6 a Reaction conditions: an alkyl acetate or a lactone (10 mmol), HSiEt, Me (30 mmol), CO (50 atm at 25" C), Co,(CO),(0.4 mmol), C, H,(20 mL), 200" C, 6 h, unless otherwise noted. Characterization of the products are given in the supplementary material. GLC yields. Isolated yields are in parentheses.'HSiMe,(30 mmol) was used as a hydrosilane. HSiEt,(30 mmol) was used as a hydrosilane. e HSiEt, Me (50 mmol) was used. f Pyridine (2" 01) was ...