英语语法分析

Dibromo neopentyl glycol was prepared from pentaerythritol and hydrobromic acid.

由季戊醇、氢溴酸制备了二溴新戊二醇。

The synthetic method of taurine was improved by shortening the reaction time and decreasing the amount of hydrobromic acid.

对牛磺酸的合成方法进行了改进。缩短了反应时间，减少了氢溴酸的用量。

And in the lappaconitine hydrobromide preparation, the outgrowth and long reaction time were overcome by dibromine alkyl instead of hydrobromic acid.

同时在氢溴酸盐制备上，用二溴代烷烃代替氢溴酸克服了反应副产物和反应时间长等问题。