Add time:08/25/2019         Source:sciencedirect.com

The 13C NMR spectra of several 1,3-pyridylmethyl ureas and their corresponding thioureas have been obtained. The 13C chemical shifts, and the direct and long range 13C1H coupling constants have been deduced. The results indicate an E, Z molecular conformation for 1,3-pyridylmethyl ureas and thioureas which is stabilized by internal NH⋯N (pyridine) hydrogen bonding.

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