强酸位是对二乙苯和乙苯裂化的活性中心，而对歧化和异构化反应生成对位异构体的选择性影响不大。

The strong acid is the active site for creaking para-diethylbenzene and ethylbenzene and it has little effect on p-isomer selectivity of disproportionation and isomerization.

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分子筛择形催化作为选择生成对位异构体的有效途径，一直以来都备受化工行业的重视，迄今已有很多科研人员投身这方面的研究。

As an efficient way to produce p-isomers, shape-selective catalysts have been paid more and more attention by the chemical industry. Till now, lots of researchers dedicate to this field.

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对于双取代络合物ma4b2，其平面排列有三个异构体，常见的为有机化学中的邻位、间位和对位排列。

FOR a disubstituted complex, MA4B2, the planar arrangement gives three isomers, the familiar ortho, meta, and para arrangements of organic chemistry.

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