The relation between solvent polarity and the chemical shifts of two diastereoisomeric N-cyclopropylcarbonylureas 1 and 2 was examined to elucidate their conformations in solution. In non-polar solvents, where intramolecular hydrogen bonding was playing an important role, their conformations were estimated to be similar to that of 1 in its crystalline state.
S. Kohmoto, H. Kasimura, T. Nishio, I. Iida, K. Kishikawa, M. Yamamoto and K. Yamada, J. Chem. Soc., Perkin Trans. 2, 1994, 1565 DOI: 10.1039/P29940001565
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