PPA polyphosphoric acid聚磷酸
polyphosphoric acid ppa多聚磷酸中将
polyphosphoric acid chelate多磷酸钳合物
cyclic polyphosphoric acid环状聚磷酸
PPSE polyphosphoric acid trimethylsilyl ester多聚磷酸三甲硅酯
The experimental results showed that nitration of o-xylene has good para-position selectivity in the presence of polyphosphoric acid.
实验结果显示，在多聚磷酸存在的情况下硝化邻二甲苯有较佳的对位选择性。
参考来源 - 微波辐射下酰基化反应的研究N（名词） any one of a series of oxyacids of phosphorus with the general formula HPO3. The first member is pyrophosphoric acid (n = 2) and the series includes the highly polymeric metaphosphoric acid. The higher acids exist in an equilibrium mixture 多聚磷酸