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The application provides application of phosphorus ylide organophosphine as Lewis base in catalysis of polar vinyl monomer polymerization, and belongs to the technical field of polymer synthesis. The application utilizes phosphorus ylide organophosphine as Lewis base, and through Lewis base and Lewis acid synergistic catalysis of polar vinyl monomer polymerization under the cooperation of Lewis acid, realizes active controllable polymerization of polar vinyl monomer by changing steric hindrance and electronic effect of Lewis acid and Lewis base, and can realize active controllable homopolymerization and copolymerization (random copolymerization and block copolymerization) of different polar vinyl monomers. The molecular weight of the obtained polymer increases with the increase of the monomer to catalyst ratio, so that the system can realize the molecular weight of the polymer reaching more than 10 6 g / mol, the measured value of the molecular weight of the obtained polymer is basically consistent with the theoretical value, the monomer conversion rate is 100%, and the initiation efficiency is close to 100%.

The application relates to the technical field of wire rod production, in particular to a production method of high-efficiency and energy-saving alloy tool steel wire rod, and production steps of the method comprise the following steps: (1) cogging; (2) heating; (3) rolling: adopting a finishing rolling unit to roll, the temperature of an intermediate blank entering the finishing rolling unit is 900-910 DEG C, the temperature of the intermediate blank leaving the finishing rolling unit is 900-920 DEG C, so that the difference between the temperature of the intermediate blank leaving the finishing rolling unit and the temperature of the intermediate blank entering the finishing rolling unit is less than or equal to 20 DEG C; (4) cooling; (5) packing, the temperature of entering and leaving the finishing rolling unit is controlled by the cooling water pressure between the finishing rolling unit racks, high-strain-rate large deformation rolling in a non-recrystallization zone increases the dislocation and substructure density in supercooled austenite, and the produced deformation storage energy.

The application discloses a preparation method of chiral sulfonamide synthesized by nickel-catalyzed asymmetric reduction and a chiral sulfonamide compound. The preparation method comprises the following steps: using a proton as a hydrogen source, and under the action of a chiral nickel catalyst and a boron reagent, chiral sulfonamides with various substituents can be obtained, and the enantiomeric excess can reach 98%. The application has the advantages of simple and practical operation, high yield, high enantioselectivity, environmental friendliness, greenness, mild reaction conditions and potential practical application value.

The application discloses a method for synthesizing chiral N-(1,2-diphenylethyl)-4-methylbenzenesulfonamide by using palladium and a chiral biphosphine ligand as a catalytic system, borohydride as a hydrogen source, and cis-2,3-diphenyl-1-toluenesulfonyl aziridine derivatives as a substrate, and assembles chiral N-(1,2-diphenylethyl)-4-methylbenzenesulfonamide derivatives by asymmetric hydrogenolysis. The method is simple and practical, raw materials are easy to obtain, has high enantioselectivity, good yield, simple operation, and the like, and has the advantages of commercially available catalysts.