1203A通过改变反应时间，反应温度，溶剂等反应条件进行控制变量反应，将反应后的混合物纯化后，进行环氧当两滴定。原理是通过高氯酸（HCIO4)与溴化四乙基铵(NEt4Br )反应生成的溴化氢与1，2-环氧基的定量反应。该程序包括用高氯酸-冰醋酸标准溶液滴定溶解在含溴化四乙基铵的环氧树脂的二氯甲烷溶液，以结晶紫为指标剂，当环氧基被消耗完，过量的溴化氢会引起过量的结晶紫指标剂变色。

1203A is reacted with control variables by changing reaction time, reaction temperature, solvent and other reaction conditions, and after purifying the reacted mixture, epoxy is performed as two titrations. The principle is the quantitative reaction of hydrogen bromide and 1,2-epoxy group by reacting perchloric acid (HCIO4) with tetraethylammonium bromide (NEt4Br). The procedure consists of titrating a dichloromethane solution dissolved in an epoxy resin containing tetraethylammonium bromide with a perchloric acid-glacial acetic acid standard solution, with crystal violet as an indicator, when the epoxy group is consumed, excess hydrogen bromide will cause excessive crystal violet indicator discoloration.