References
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- Proton , N. M. R. spectra were recorded on a Varian EM-360 (60 MHz) instrument and proton chemical shifts are reported in parts per million (ppm) downfield from TMS as internal reference. Infrared spectra were recorded on a Perkin-Elmer 257 spectrophotometer., Melting points were determined on a Büchi 510 apparatus. Melting and boiling points are uncorrected