98997-63-8

Upstream product

• 16450-38-7 5-azoniaspiro<4.4>nonane bromide 
• 123-75-1 pyrrolidine 
• 110-56-5 1,4-dichlorobutane 

Relevant academic research and scientific papers

Sustainable Carboxylation of Diamines with Hydrogen Carbonate

A protocol for the carboxylation of diamines employing quaternary ammonium hydrogen carbonates as C1 source is presented. The approach is used to obtain industrially relevant bis-O-alkyl carbamates with diverse structural features in very high yield, even on gram scale. The quaternary ammonium salts, formally acting as "transporters" of the carboxylating agent, can be recovered after the reaction, and recycled with high efficiency. Regeneration of the hydrogen carbonates on ion-exchange resin grants excellent atom economy in the process.

SUSTAINABLE SYNTHESIS OF CARBAMATE COMPOUNDS

A method for the production of carbamate compounds comprises the steps of: A) reacting an organic primary amine with an organic halogen compound in the presence of a quaternary organic ammonium carbonate and/or bicarbonate, thereby obtaining a reaction mixture comprising a carbamate compound and a quaternary organic ammonium salt; B) separating the quaternary organic ammonium salt from the reaction mixture obtained after step A); C) contacting the quaternary organic ammonium salt obtained after step B) with a carbonate and/or bicarbonate anion-exchange resin, thereby obtaining a quaternary organic ammonium carbonate and/or bicarbonate; D) repeating step A) at least once, wherein the quaternary organic ammonium carbonate and/or bicarbonate employed in this next step A) is at least partially sourced from the quaternary organic ammonium carbonate and/or bicarbonate obtained from the preceding step C).

Preparation method of spiro quaternary ammonium tetrafluoroborate

The invention discloses a preparation method of spiro quaternary ammonium tetrafluoroborate. The method comprises steps as follows: (1) an acetonitrile solvent, carbonate, a bromine catalyst, pyrrolidine and 1,4-dichlorobutane are added to a reaction kettle to have a reaction, and a chlorinated spiro quaternary ammonium salt solution is obtained; potassium tetrafluoroborate is added to an acetonitrile solution of chlorinated spiro quaternary ammonium salt, the mixture has a reaction and then is subjected to ion exchange and filtration, carbonate is added to a filtrate, the mixture is stirred, filtered and subjected to reduced-pressure distillation, and a crude spiro quaternary ammonium tetrafluoroborate product is obtained; (2) high-purity spiro quaternary ammonium tetrafluoroborate is obtained with a series of purification methods such as extraction, reduced-pressure distillation, recrystallization, drying and the like. The yield and the purity of spiro quaternary ammonium tetrafluoroborate prepared with the method are relatively high, the content of halide ions and water is low, and spiro quaternary ammonium tetrafluoroborate has the remarkable performance advantage when used as a supercapacitor electrolyte.

Preparation method of spiro cyclic quaternary ammonium salt

The invention discloses a preparation method of a spiro cyclic quaternary ammonium salt, which comprises the following steps of: in the water, a nucleophilic substitution reaction is carried out on a compound 3 and ammonia to generate the spiro cyclic quaternary ammonium 2. The reaction temperature is between 40 DEG C and 200 DEG C. The preparation method of the invention has the advantages that raw materials are cheap and low toxic, the metal ion content in products is low and the purity is high, and the operation is simple. The preparation method of the spiro cyclic quaternary ammonium salt is suitable for industrial production.

Synthesis of oxygen-containing spirobipyrrolidinium salts for high conductivity room temperature ionic liquids

Synthesis of ionic liquids (IL) based on oxygen-containing spirobipyrrolidinium salts with BF4 , BF3C 2F5 , and NTf2 as counterions was undertaken. Their physical and electrochemical properties were evaluated for suitability for Room Temperature Ionic Liquids (RTIL) application. Reduction in melting point occurred upon exchange of C(2) by an O-atom of spirobipyrrolidinium, without sacrificing the electrochemical stability; while introduction of alkyl groups between the N- and O-atoms led to incorporation of asymmetry, and hence reduced the melting points, and viscosity.