Phosphorus-containing dication ionic liquid as well as preparation method and application thereof

Abstract

The invention discloses a phosphorus-containing dication ionic liquid as well as a preparation method and application thereof. The phosphorus-containing dication ionic liquid has the structural general formula shown in the figure (I), wherein n is an integer within the range of 2-8; R1, R2 and R3 are respectively selected from saturated or unsaturated alkyl with 1-20 carbon atoms, aryl group or heterocyclic ring group; cation A is one selected from imidazoles, quaternary ammoniums, quaternary phosphorus, pyridines, pyrroles, thiazoles, 3-nitrogen imidazole, pyrrolines, thiazolines, amino acids, guanidines and benzotriazole imidazoles; and X<-> and Y<-> are organic or inorganic negative ions. The phosphorus-containing dication ionic liquid can be used for catalyzing cycloaddition of carbon dioxide and epoxy compound for synthesizing cyclic carbonate, and has the characteristics of being high in activity, good in selectively and good in stability, needing no solvent and cocatalyst, and the like.

Description

technical field [0001] The invention relates to a dication ionic liquid, in particular to a dication ionic liquid containing phosphonium ions, a preparation method and application thereof. technical background [0002] Ionic liquids refer to salts composed of organic cations and inorganic / organic anions that are liquid at or near room temperature. In recent years, due to the advantages of low melting point, low volatility, good thermal stability, high electrical conductivity, wide electrochemical window, adjustable structure and physical and chemical properties, ionic liquids have been widely used in organic synthesis, electrochemical research, extraction and separation, and materials It has been widely used in the fields of synthesis and catalysis. [0003] The widely studied ionic liquids are mainly monocationic ionic liquids [Green Chem, 2002, 4, 407-413], such as imidazolium salts, pyridinium salts, quaternary ammonium salts, and quaternary phosphonium salts. However, ...

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Problems solved by technology

Although these ionic liquids have certain catalytic activity to the cycloaddition reaction, they all have one or several problems as follows: their own activity is not high or they show better catalytic activity in the presence of co-catalysts such as metal halides. Poor stability, active components are sensitive to water, harsh reaction conditions, etc.

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