V. Mirkhani et al. / Tetrahedron 59 (2003) 8213–8218
8217
4. Experimental
The progress of the reaction was monitored by GLC. After
completion of the reaction, the mixture was filtered and
washed with ether. The eluate was concentrated under
reduced pressure and chromatographed on a silica-gel
column to give a pure product in 80–97% yields.
4.1. General
Products were characterized by comparison of their physical
data with those of known samples. All yields refer to
isolated products. The ammonium decatungstocerate(IV)
icosohydrate was prepared according to the literature.31,32
All catalysts were characterized by UV–Vis and IR
spectroscopy and elemental analysis. Infrared spectra were
recorded on a Philips PU-9716 or Shimadzu IR-435
Acknowledgements
The authors are grateful to the Isfahan University Research
Council for partial support of this work.
1
spectrophotometer. H NMR spectra were recorded on a
Bruker AW 80 (80 MHz) spectrometer. All analyses were
performed on a Shimadzu GC-16A instrument with a flame-
ionization detector using silicon D.C.-200 or carbowax 20-
M columns. Mass spectra were recorded on a Shimadzu
GCMS-QP 1000 EX. A microanalysis was carried out by the
Research Institute of Petroleum Industry. Chemicals were
purchased from Fluka and Merck chemical companies. The
chemical purities of all epoxides were checked by gas
chromatography and confirmed to be higher than 98%.
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