英语语法分析

OBJECTIVE To synthesize 4-chlorobutanal acetal by improved method.

目的改进4-氯丁醛缩醛的合成方法。

Under these conditions, the yield of butyraldehyde glycol acetal is 71.1%.

在此反应条件下，丁醛乙二醇缩醛的收率可达71.1%。

The reaction of phenol, xylene—formaldehyde resin with boric acid gets an acetal resin.

苯酚、二甲苯缩甲醛树脂及硼酸反应生成缩醛树脂。