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α、α′-对苯二甲二氯(ClH_2C-(?)CH_2Cl),是水解制对苯二甲醇的原料,对苯二甲醇则是合成树脂的重要原料。目前国内外多采用对二甲苯直接光氯化法制备对苯二甲二氯。此法所得氯化产物组成比较复杂。西铁之辅等人曾用乙酸醋衍生物的气相色谱法分析苯二甲二氯三种异构体的含量。但该法一般适用于将苄氯氯甲基化制α、α′-对苯二甲二氯的产物分析。若将此法用于上述对二甲苯直接光氯化产物的分析就不合宜。
α, α’-p-xylylene dichloride (ClH_2C - (?) CH_2Cl) is the raw material for the hydrolysis of para-xylene glycol, while terephthalic acid is an important raw material for synthetic resins. At home and abroad more use of p-xylene direct photo-chlorination of p-xylylene. The chlorinated products obtained by this method are complicated in composition. Fujiwara of West Rail et al. Used gas chromatography of acetate derivatives to analyze the contents of three isomers of xylene dichloride. However, this method is generally applicable to the analysis of the product of benzyl chloromethylation α, α’-p-xylylene dichloride. If this method is used for the above analysis of p-xylene direct photochlorination product is not appropriate.