Stereochemistry of a series of diastereomeric esters obtained from chiral alcohols 1a-21a by derivatization with (S)- or (R)-chlorofluoroacetic acid was correlated with their LC and GC separation (∆tr) and NMR resolution (∆δ). Both the chromatographic and NMR spectral behavior of respective diastereomers was found to follow systematic rules reflecting their steric arrangement. Moreover, identical conformations of the esters seem to be preferred in solution as well as in the chromatographic processes. Reasons underlying this behavior are discussed.
一系列由手性醇1a-21a经过与(S)-或(R)-氯氟乙酸衍生而得到的对映异构酯的立体化学与它们的LC和GC分离(Δtr)以及NMR分辨率(Δδ)相关联。发现各对映异构体的色谱和NMR光谱行为均遵循反映它们空间排列的系统规律。此外,酯的相同构象似乎在溶液中以及色谱过程中更受青睐。讨论了导致这种行为的原因。