烷基咪唑催化合成磷酸叔丁基苯二苯酯

Catalytic synthesis of tert-butylphenyl diphenyl phosphate with alkyl imidazole

关键词:  离子液体催化剂  烷基咪唑  磷酸叔丁基苯二苯酯  空间结构  电子基团 

Key words:  ionic liquid catalyst  alkyl imidazole  tert-butylphenyl diphenyl phosphate  spatial structure  electronic group

摘要:

目的 为了提高一锅法合成磷酸叔丁基苯二苯酯(BPDP)的产率,以不同空间结构和电子基团的烷基咪唑硫酸氢根离子液体为催化剂进行研究。方法 比较了不同碳链的N-烷基咪唑硫酸氢根离子液体和带有不同电子基团的烷基咪唑硫酸氢根离子液体对BPDP产率的影响,并研究了催化剂用量和催化剂循环对产率的影响。结果 当催化剂的侧链结构为乙基时,BPDP的产率最高；吸电子基团可以提高BPDP产率,给电子基团则会使BPDP产率降低；催化剂用量为4-叔丁基苯酚质量的1.5%时,BPDP的产率最高；催化剂在循环使用6次后仍具有较高的催化活性。结论 离子液体催化剂的空间结构和电子基团均对BPDP产率有明显影响,使用1-乙基-2-氟-咪唑硫酸氢根离子液体为催化剂时可以将BPDP产率提升至85.3%,从而提高经济效益。 

Abstract:

Objective In order to improve the yield of tert-butylphenyl diphenyl phosphate(BPDP) synthesized by one-pot method, alkyl imidazole hydrogen sulfate ionic liquids with different spatial structures and electronic groups were used as catalysts. Methods This study compared the effects of N-alkyl imidazole hydrogen sulfate ionic liquids with different carbon chains and alkyl imidazole hydrogen sulfate ionic liquids with different electronic groups on the yield of BPDP synthesis, and further investigated the effects of catalyst dosage and catalyst circulation on the yield. Results When the side chain structure of the catalyst is ethyl, the yield of BPDP is the highest. Electron-absorbing groups can increase the yield of BPDP, while electron-donating groups can reduce the yield of BPDP. The yield of BPDP is the highest when the catalyst dosage is 1.5 w% of 4-tert butylphenol. The catalyst still has high catalytic activity after 6 cycles of useage. Conclusion sThe spatial structure and electronic groups of ionic liquid catalysts have a significant effect on the yield of BPDP. When 1-ethyl-2-fluoro-imidazole hydrogen sulfate ionic liquid is used as the catalyst, the yield of BPDP can increase to 85.3 w%, thereby economic benefits can be improved.