4 results about "Insertion reaction" patented technology

The application discloses a dicarboxylic acid-quaternary ammonium salt synergistic catalytic system and application thereof in carbon dioxide and epoxide reaction. The catalytic system comprises a dicarboxylic acid compound and a quaternary ammonium salt, wherein the dicarboxylic acid serves as a hydrogen bond donor, the quaternary ammonium salt provides a nucleophilic anion, and both of them synergistically promote epoxide activation and carbon dioxide insertion reaction. The dicarboxylic acid preferably has a first dissociation constant pKa1 of 4.0-7.0, and the quaternary ammonium salt is preferably a bromide or iodide tetraalkylammonium salt. In the presence of the catalytic system, carbon dioxide can be efficiently reacted with various epoxides under relatively mild conditions to generate corresponding cyclic carbonates. The catalytic system has the advantages of simple structure, no metal, high catalytic efficiency, wide substrate application range and the like, and has a good industrial application prospect.

The utility model discloses a kind of reaction systems for organic peroxidation, belong to chemical experiment equipment technical field.It includes reaction unit and stirring unit, reaction unit includes reaction cavity, it is used to accommodate reactant in it, stirring unit inserts reaction cavity, the reactant in reaction cavity is stirred, further include foam collecting unit, the foam collecting unit includes foam collection chamber, foam drainage pipe and foam trapping tank, the foam collection chamber is fixed in reaction cavity inner wall, foam drainage pipe one end communicates foam collection chamber inside, foam drainage pipe other end connects foam trapping tank, wherein, the nozzle of foam drainage pipe is towards the notch of foam trapping tank, reaction end line is set on foam collection chamber.The utility model aims at accurate judgment reaction end.

This invention provides a method for the rearrangement nitrogen insertion reaction of indole phosphonium salts and tert-butyl (p-toluenesulfonyloxy) carbamate under potassium carbonate-promoted conditions, synthesizing a series of 3-aminoindole compounds. The technical solution of this invention has the following significant advantages: it eliminates the need for expensive metal catalysts, significantly reducing production costs; the reaction conditions are mild and simple, and the reaction can be carried out efficiently at room temperature with only the addition of a base and an amine source, achieving excellent chemoselectivity, regioselectivity, broad functional group compatibility, and excellent atom economy.

The invention relates to a degradable copolyester, a monomer used by the degradable copolyester and a preparation method of the monomer, and the preparation method of the monomer comprises the following steps: adding protonic acid, halide and a compound as shown in a formula (1) into an organic solvent, carrying out heating reaction under a protective atmosphere, and after the reaction is finished, separating to obtain an intermediate product as shown in a formula (2); and adding the intermediate product, an alkaline compound, a transition metal catalyst and a phosphine ligand into a solvent, introducing CO, carrying out a heating reaction, and after the reaction is finished, carrying out separation to obtain the monomer as shown in a formula (3). According to the method, the monomer based on the terephthalic acid and propyl alcohol ester and shown in the formula (3) can be obtained through the halogenation reaction and the carbonyl insertion reaction, the raw materials used in the reaction are low in cost and safe, the reaction conversion rate, selectivity and stability are high, and the product is easy to purify and separate.