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Conformations of selected 3-substituted 4-hydroxycoumarins in solution by nuclear magnetic resonance. Warfarin and phenprocoumon
Valente,Porter,Trager
, p. 231 - 234 (1978)
The chemical shift position of the benzylic proton, H(x), has been found to be diagnostic in indicating the preferred conformations of selected 3-substituted 4-hydroxycoumarins. In general, the nonrigid open-chain compounds, e.g., the open-chain tautomer
