侧链基团相对于主链，R基是烷链基。
反应机理推测为丝、苏氨酸的侧链基团羟基在咪唑的存在下亲核进攻磷原子形成五配位中间体。
Only N-phosphoryl serine and threonine methyl esters were catalyzed by imidazole, A new type of pentacoordinate phosphorus intermediate was proposed.
于聚噻吩衍生物的主链上引进柔软的侧链基团可以助其稳定性及改善其加工性质，以利进行更完整的分析。
The introduction of flexible pendants chains onto the backbone improves the stability and processability allowing a more complete characterization of the materials.
许多文献报道证实，庞大的侧基或具有形成氢键能力的基团有利于聚合物主链形成稳定的螺旋构象，从而赋予材料高度的旋光活性和某些特殊功能。
In general, bulky side-chain and hydrogen bonding are in favor of the formation of stable helical conformation for polymers, which endows them with high optical property and some special performance.
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