The conformational preferences of β-sulfonamidopeptides (for example 1) in chloroform solution were investigated by variable-temperature 1H NMR spectroscopy and FT-IR spectroscopy. The following hydrogen-bonding acceptor scale was derived from the experiments: RCON≈tBuOCON>COOMe≥RSO2N.
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Gennari et al. (1998) studied this question.