Citation:
DENG Yun-Quan, FANG Yan-Xiong, REN Qing-Gang, ZHANG Jin-Ling, XU Xue-Tao. Chloromethylation Reaction of o-Xylene Catalyzed by Ionic Liquids[J]. Chinese Journal of Applied Chemistry,
;2008, 25(10): 1138-1141.
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1-Butyl-3-methyl imidazolium salts with hexafluorophosphate,tetrafluoroborate,perfluorobutyl sulphonate,and chloride anions and eight kinds of alkylimidazolium bromide salts with different alkyl chain length were prepared.The Blanc chloromethylation of o-xylene with hydrogen chloride and paraformaldehyde was investigated in the presence of the above ionic liquids as catalysts.The influence of the type and the amount of the ionic liquid,reaction temperature,and reaction time on the chloromethylation was investigated.The products were analyzed by GC-MS.The results showed that 1-dodecyl-3-methylimidazolium bromide([C12mim]Br) was the best one among the catalysts for the reaction.The optimum reaction conditions were 4%(the molar ratio of ionic liquid to o-xylene) ionic liquid,70℃ reaction temperature and 10 h reaction time.Under the above reaction conditions,the yield was 89.8%,and the turnover number was 22.4.
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Keywords:
- Ionic liquid,
- o-xylene,
- chloromethylation
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