4 results about "Hexamethylphosphoramide" patented technology

The solvated metal particle-coating system includes a metal additive and a polar outer-sphere electron transferring solvent. The metal additive is solvated in the polar outer-sphere electron transferring solvent. The polar outer-sphere electron transferring solvent may include liquid ammonia, methylamine, and / or hexamethylphosphoramide. The metal additive may include an alkali metal and / or an alkaline earth metal. The solvated metal additive within the polar outer-sphere electron transferring solvent may be used to coat a metal particle and / or a metalloid particle as a layer. As the polar outer-sphere electron transferring solvent evaporates, the solvated metal additive is coupled to the metal particle and / or the metalloid particle.

This invention relates to a coating solution for composite lithium-ion battery separators, a composite lithium-ion battery separator, and a method for preparing the same. The coating solution for composite lithium-ion battery separators comprises: (A) poly(p-phenylene terephthalamide); (B) an organic solvent, which is at least one selected from hexamethylphosphoramide and tetramethylurea; (C) a co-solubilizing salt, which is at least one selected from lithium chloride and calcium chloride; and (D) an additive, which is at least one selected from ceramic powder and polymer binder. The coating solution for composite lithium-ion battery separators exhibits good stability. The composite lithium-ion battery separator possesses good air permeability, heat resistance, and good compatibility with the electrolyte, making it suitable for lithium-ion batteries. The preparation methods for both the coating solution and the composite lithium-ion battery separator are simple, convenient, and have low production costs.

The invention discloses a controllable free radical polymerization method for regulation and control of solvated electron initiation by a cosolvent, the polymerization method adopts a high polymerization temperature and simultaneously adds a cosolvent tetrahydrofuran for regulation and control, and solvated electron initiation polymerization still can maintain the property of controllable free radical polymerization. The method can be used for preparing polymers with accurate and controllable molecular weight and narrow molecular weight distribution as well as polymers with various topological structures such as blocks and stars with accurate structures. The cosolvent-regulated solvated electron-initiated controllable free radical polymerization method comprises the following steps: adding a cosolvent into a polymerization system of alkali metal lithium / hexamethylphosphoric triamide solvated electron-initiated allyl monomers, carrying out controllable free radical polymerization, improving the polymerization rate and obtaining a polymer with narrow molecular weight distribution, wherein the cosolvent is tetrahydrofuran, the dosage of the tetrahydrofuran is 3-6 mL and the polymerization temperature is 50-60 DEG C on the basis that the dosage of the hexamethylphosphoramide is 20 mL.

A method for preparing lignan-derived schisandrol A, belonging to the field of medicinal chemistry. The method comprises: 1. Preparing intermediate 1 using 3,4,5-trimethoxybenzaldehyde and N-bromosuccinimide; 2. Preparing intermediate 2 using intermediate 1, a nickel catalyst, a ligand, tetrabutylammonium iodide, and zinc powder; 3. Preparing intermediate 3 using intermediate 2, methyl chloropropionate, and an organic base; 4. Preparing intermediate 4 using intermediate 3, ethyltriphenylphosphine bromide, and potassium tert-butoxide; 5. Preparing intermediate 5 using intermediate 4, an alkaline solution, and hydrochloric acid; 6. Preparing lignan-derived schisandrol A using intermediate 5, a samarium catalyst, hexamethylphosphoramide, and tert-butanol. This invention optimizes the reaction pathway, requiring only 6 steps to efficiently synthesize schisandrol A, significantly shortening the traditional synthetic route, improving overall reaction efficiency and the total yield of the target product. Tests show that schisandrol A has good antibacterial activity against *Escherichia coli* and *Staphylococcus aureus*.