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22 Selected characterization data. Compound 4a (silylated): mp. 110-111 °C (EtOH). 1H NMR (200 MHz, CDCl3): δ = 0.08 (s, 9 H), 0.33 (s, 9 H), 1.35 (s, 9 H), 7.20-7.25 (m, 1 H), 7.30 (d, J = 2.2 Hz, 1 H), 7.34 (s, 1 H), 7.36 (s, 1 H), 7.56 (d, J = 2.2 Hz, 1 H), 7.68 (d, J = 7.6 Hz, 1 H) ppm. 13C NMR (50 MHz, CDCl3): δ = -0.34, -0.04, 30.97, 34.75, 97.52, 101.64, 101.98, 104.04, 122.75, 123.29, 125.27, 126.58, 127.18, 128.29, 128.84, 131.43, 132.41, 141.58, 144.20, 150.68 ppm. FTIR (KBr): 3052.63, 2955.33, 2893.88, 2151.35, 1244.95, 871.12, 840.40 cm-1. HRMS: m/z (%) calcd for C22H33BrSi2: 480/482. Found: 482.1284(20) [M + 2], 480.1304(25) [M+], 467(80) [M+ - CH3]. Compound 5a: 1H NMR (200 MHz, CDCl3): δ = 1.43 (s, 9 H), 7.34-7.45 (m, 4 H), 7.55-7.63 (m, 1 H), 7.77-7.81 (m, 1 H), 7.85-7.95 (m, 2 H), 8.06 (d, J = 2 Hz, 1 H) ppm. 13C NMR (100 MHz, CDCl3): δ = 29.69, 31.65, 119.03, 119.32, 121.37, 121.54, 121.81, 123.05, 125.47, 125.79, 126.51, 127.06, 127.37, 127.95, 128.96, 132.12, 132.81, 151.38 ppm. HRMS: m/z (%) calcd for C20H18: 258.1409. Found: 258.1403(65) [M+], 243(100) [M+ - CH3]. Anal. Calcd for C20H18: C, 92.97%; H, 7.02%. Found: C, 92.74%; H, 7.03%. Compound 6c: Yellow oil. 1H NMR (200 MHz, CDCl3): δ = 1.75 (s, 9 H), 7.22 (m, 7 H), 7.31 (d, J = 7 Hz, 1 H), 7.33 (m, 5 H), 7.35 (d, J = 8 Hz, 1 H), 7.55 (d, J = .5 Hz, 1 H), 7.67 (d, J = 7 Hz, 1 H) ppm. 13C NMR (50 MHz, CDCl3): δ = 30.96, 34.76, 87.51, 89.06, 93.11, 96.38, 115.16, 120.18, 121.90, 122.81, 123.33, 123.42, 125.49, 125.55, 126.74, 126.81, 127.24, 127.87, 127.91, 128.10, 128.32, 129.04, 131.26, 131.55, 131.59, 131.77, 132.57, 141.60, 143.44, 150.67 ppm. MS (EI, 70 eV): m/z (%) = 488(10) [M+], 473(80) [M+ - CH3]. Anal. Calcd for C32H25Br: C, 78.52%; H, 5.14%. Found: C, 78.33%; H, 4.90%. Compound 7: mp 170-171 °C (MeOH). 1H NMR (200 MHz, CDCl3): δ = 1.82 (s, 9 H), 7.25 (m, 6 H), 7.37 (m, 5 H), 7.51 (s, 1 H), 7.73 (t, J = 8 Hz, 1 H), 7.95 (t, J = 8 Hz, 1 H), 8.11 (d, J = 7 Hz, 1 H), 8.71 (s, 1 H), 9.03 (d, J = 8 Hz, 1 H) ppm. 13C NMR (50 MHz, CDCl3): δ = 31.81, 35.65, 116.57, 120.74, 122.85, 125.20. 125.98, 126.20, 127.02, 127.19, 127.27, 127.38, 128.34, 128.93, 131.21, 131.49, 131.56, 134.25, 136.93, 137.19, 138.50, 138.92, 145.23, 151.51 ppm. MS: m/z (%) calcd for C32H26: 410.2035. Found: 410.2035(20) [M+], 395(100) [M+ - CH3].
