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The alkylation of toluene with 1,3-pentadiene to produce pentyltoluene was carried out to obtain 2,6-dimethylnaphalene,which is an important intermediate during the production of 2,6-naphthalene dicarboxylic acid.Based on our previous work using anhydrous AlCl3 as catalyst,[bupy]BF4-AlCl3 ionic liquids were employed to catalyze the reaction of 1,3-pentadiene with toluene.The experimental results show that[bupy]BF4-AlCl3 ionic liquids are suitable for the reaction especially when the molar ratio of AlCl3 to[bupy]BF4 is 1.75︰1,and the reaction could proceed at the temperature as low as 0℃.It could be as active as pure AlCl3,but much more environmentally friendly.
The alkylation of toluene with 1,3-pentadiene to produce pentyltoluene was carried out to obtain 2,6-dimethylnaphalene, which is an important intermediate during the production of 2,6-naphthalene dicarboxylic acid. Based on our previous work using anhydrous AlCl3 as catalyst, [bupy] BF4-AlCl3 ionic liquids were employed to catalyze the reaction of 1,3-pentadiene with toluene. The experimental results show that [bupy] BF4-AlCl3 ionic liquids are suitable for the reaction especially when the molar ratio of AlCl3 to [buffered] BF4 is 1.75: 1, and the reaction could proceed at the temperature as low as 0 ° C.It could be as active as pure AlCl3, but much more environmentally friendly.