The ortho-compound formed penta cyclic compound was more stable that the meta-compound formed hexa cyclic compound, so the reaction rate of the ortho-compound is larger.
由邻位化合物生成的五元环络合物比由间位化合物形成的六元环络合物稳定性高，反应速度快。
2
Higher PSSS concentration and reaction temperature favored the formation of the meta-stable calcium oxalate dihydrate (COD) crystals and stable calcium oxalate monohydrate (COM), respectively.