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1 General methods Unless otherwise noted, all reactions and manipulations involving air- or moisture-sensitive compounds were performed using standard Schlenk techniques or in a glovebox. All solvents were purified and dried using standard procedures. Melting points were measured on a RY-I apparatus and uncorrected. 1H, 13 C, 31 P and 19 F NMR spectra were recorded on Varian Mercury 300 or 400 MHz spectrometers. Chemical shifts(δ values) were reported in ppm downfield from internal TMS(1H NMR), CDCl3(13C NMR), external 85% H3PO4(31P NMR), and external CF3CO2H(19F NMR), respectively. Optical rotations were determined using a Perkin Elmer 341 MC polarimeter. The IR spectra were measured on a BRUKER TENSOR 27
1 General methods Unless otherwise noted, all reactions and manipulations involving air- or moisture-sensitive compounds were performed using standard Schlenk techniques or in a glove box. All solvents were purified and dried using standard procedures. Melting points were measured on a RY-I apparatus NMR spectra were recorded on a Varian Mercury 300 or 400 MHz spectrometers. Chemical shifts (δ values) were reported in ppm downfield from internal TMS (1H NMR), CDCl 3 (13C NMR) , external 85% H3PO4 (31P NMR), and external CF3CO2H (19F NMR), respectively. Optical rotations were determined using a Perkin Elmer 341 MC polarimeter. The IR spectra were measured on a BRUKER TENSOR 27