tailieunhanh - Study of using [bmim][pf6] ionic liquid as a green solvent and catalyst for the schiff base synthesis

The [BMIM][PF6] ionic liquid that derived from dialkylimidazolium cations was synthesized using MW-assisted method under solvent-free condition. The synthesis of paraanisidineacetylacetone was then conducted in [BMIM][PF6] ionic liquid as solvent with good conversion after 6 hours under ambient condition without added catalyst. Interestingly, the recycle of [BMIM][PF6] ionic liquid was performed. The results showed that [BMIM][PF6] ionic liquid can be recovered and successfully recycled into subsequent reactions without significant loss of activity. | Tạp chí Khoa học công nghệ và Thực phẩm 13 (1) (2017) 39-47 STUDY OF USING [BMIM][PF6] IONIC LIQUID AS A GREEN SOLVENT AND CATALYST FOR THE SCHIFF BASE SYNTHESIS Nguyen Thi Hong Anh1,*, Nguyen Xuan Thao2, Phan Thanh Son Nam2 1 Ho Chi Minh City University of Food Industry 2 Ho Chi Minh City University of Technology *Email: anhnth@ Received: 29 June 2017; Accepted for publication: 28 November 2017 ABSTRACT The [BMIM][PF6] ionic liquid that derived from dialkylimidazolium cations was synthesized using MW-assisted method under solvent-free condition. The synthesis of paraanisidineacetylacetone was then conducted in [BMIM][PF6] ionic liquid as solvent with good conversion after 6 hours under ambient condition without added catalyst. Interestingly, the recycle of [BMIM][PF6] ionic liquid was performed. The results showed that [BMIM][PF6] ionic liquid can be recovered and successfully recycled into subsequent reactions without significant loss of activity. Keywords: Ionic liquids, dialkylimidazolium, [BMIM][PF6], p-anisidineacetylacetone, Schiff Base. 1. INTRODUCTION Due to the environmental concerns, there has been an increasing interest in exploiting the application of ionic liquids as the green reaction medium alternatives to hazardous organic solvents. This claim rests on the fact that ionic liquids offer a great number of unique properties not achievable with any other organic solvent such as low volatility, negligible vapor pressure, high thermal stability, outstanding reusability and ease of separation of products from reactants. Room temperature ionic liquids, especially those containing the 1-alkyl-3-methylimidazolium cation, have been considered as a promising solvents due to their unique properties including non-volatility, non-flammability, high conductivity, high chemical and thermal stability, etc [1-3]. 1-alkyl-3-methylimidazoliumbased ionic liquids have been widely applied as greener solvents for a range of organic conversions, providing not