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- The protons on the asymmetric carbons of 4, 5, and 6 appear at considerably low fields, 6.09, 6.70, and 6.41ppm, respectively, in their 1H NMR spectra. Also the central carbon signals for those compounds appear at much lower fields(94.2, 95.3, and 81.1ppm, respectively) than that of chloroform in their 13C NMR spectra