ring-opening reaction meaning in Chinese

开环反应

Using sodium dicyandiamide and saccharin as raw materials , tribenuron - methyl is synthesized via ring - opening reaction , phosgenation and condensation with total yield of 57 . 0 % and product purity of 95 . 6 %
以双氰胺钠和糖精为起始原料，经过开环、光气化、缩合等一系列反应制备了苯磺隆，合成反应的总收率可达57 . 0 %以上，纯度可达95 . 6 %以上。
Mirtazapine was prepared by a seven - step reaction , namely nucleophilic ring - opening reaction , chlorination , cyclization , uncleophilic substitution , hydrolysis , reduction and cyclization from styrene oxide and n - methylethanolamine as the starting materials , with overall yield of 22 . 6 %
摘要以环氧苯乙烯和n -甲基乙醇胺为起始原料，经亲核开环、氯代和环合反应得到中间体1 -甲基3 -苯基哌嗪。