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- W1974559303 abstract "Abstract In order to analyze completely the ring conformation of [S]-Proline ( l -thiazolidine-4-carboxylic acid) this compound has been synthesized with its Cδ atom enriched at 90% in 13C. The 1H-1H, 13C-1H, 13C-13C vicinal coupling constants measured at several pH values describe well the geometry of the thiazolidine ring. The results suggest that the ring has an average planar conformation only in a narrow range of pH close to the pK of the amine group. Above and below this pH the ring tends to adopt preferentially the Sγ endo and Sγ exo puckered conformations respectively. It is concluded that a good correlation exists between the value of the dihedral angle o and the character Sγ endo or Sγ exo of the ring." @default.
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- W1974559303 date "1978-01-01" @default.
- W1974559303 modified "2023-10-04" @default.
- W1974559303 title "Synthesis of 13c-labelled [s]-proline and its conformational analysis by nuclear magnetic resonance" @default.
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- W1974559303 doi "https://doi.org/10.1016/0040-4020(78)80051-9" @default.
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