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Compound 9s was synthesized by a procedure similar to that described for 9a using 3-chlorobutyrophenone (8j, 3.1 g, 0.0169 mol), TBDMSOTf (4.3 mL, 18.6 mmol), and Et3N (3.8 mL) in CH2Cl2 (30 mL). After purification, 3.7 g (74%) of the title product was isolated as colorless oil: 1H NMR (CDCl3) δ 7.48-7.44 (m, 1H), 7.38-7.32 (m, 1H), 7.31-7.29 (m, 2H), 5.16 (t, 1H, J=7.1 Hz), 2.30-2.19 (m, 2H), 1.09-1.03 (m, 3H), 1.01 (s, 9H), −0.04 (s, 6H); 13C NMR (CDCl3) δ 147.5, 141.7, 133.9, 129.2, 127.3, 125.9, 123.8, 114.9, 25.8, 19.5, 14.1, 0.0, −4.1. C16H25ClOSi.

1. customCompound 9s was synthesized by a procedure similar to
2. customAfter purification