取代基的影响较小，主链共轭结构对吸收光谱的影响明显。
In short, the influence of the substituents is insignificant. However, the remarkable effect was induced by the conjugated structure in the main chain.
芳基上取代基的位置和性质以及使用的溶剂都能够影响非对映体2r, 4r和2s, 4r在溶液中的相对含量。
The relative contents of diastereomers, 2r 4r and 2s 4r, in solution are influenced by both the solvents used and the characteristics and locations of substituents on 2-aryl.
根据取代基对各类质子化学位移变化的影响。
On basis of the effect of substituents on the variation of the chem.
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