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Experimental
All the reagents and solvents employed were of the best
grade available and used without further purification. The
elemental analyses were carried out with a YANACO CHN
CORDER MT-3 analyzer. Melting points were determined
using an electrothermal apparatus and are uncorrected.
Mass spectra were obtained using a ThermoFinnigan
TRACE-DSQ electrospray ionization (ESI) mass spectrometer. IR spectra were recorded as KBr disks on a
Nicolet 560 ESP FTIR spectrometer, while
1
H-NMR and
13
C-NMR spectra were recorded on a Bruker AC-P300
instrument in CDCl3.

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