Nitrogen-15 NMR Evidence for the Structures of N-9 H-Xanthen-9-yl- and N,N'-Di-9H-xanthen-9-yl-Ureas

Article abstract of DOI:10.1002/mrc.1270130307

A new monoxanthen-9-yl derivative of urea has been synthesized and the structure of this product (N-9H-xanthen-9-ylurea) and that of the previously known N,N'-di-9H-xanthen-9-ylurea have been proved by 15N NMR and other spectroscopic techniques.A series of 13C and 15N labeled urea derivatives has been prepared and the utility of their 13C and 15N chemical shifts and coupling constants in the structural analysis of urea derivatives has been investigated.