2.1 Materials and instruments
The specifications and sources of the chemicals used in this work are
summarized in Table S1 . All reagents were used without further
purification. NMR spectra was obtained on a Bruker DPX 400 MHz
spectrometer with CDCl3 as internal standard solvent at
ambient temperature. FT-IR spectra was carried out on Nicolet iS50
infrared spectrometer, with the spectral resolution and the number of
scans of 4 cm-1 and 32, respectively. Conversion and
selectivity of epoxides were determined by HPLC analysis. ESI-MS was
used to characterize the molecular weight of the product at m/z.