41results about How to "Green and mild reaction conditions" patented technology

The invention relates to chemical synthesis methods and aims to provide a method for synthesizing N-substituted carbazole. The method comprises the following steps: adding halogenated N-substituted diphenylamine and a ligand into the same solvent for dissolving, dripping the obtained solution into potassium tert-butoxide, and stirring and reacting at the temperature of 30-160 DEG C for 6-12 hours; adding saturated sodium chloride to carry out a quenched reaction, extracting for three times by using ethyl acetate, and merging the organic phase; drying anhydrous sodium sulfate, filtering, performing reduced pressure distillation, removing the ethyl acetate, and performing thin-layer chromatography separation, thereby obtaining the N-substituted carbazole. According to the method disclosed by the invention, the defect in the prior art that transition metals are used is overcome, the reaction conditions are green and mild, and the method is suitable for industrial production.

The invention relates to a synthesis method for a polybrominated benzene [1.3] oxazine derivative, comprising the following steps of: carrying out reaction of compounds shown in formula (I) and N-bromo-succinimide (NBS) in a solvent at 25-100 DEG C to obtain the polybrominated benzene [1.3] oxazine derivative shown in formula (II) after the reaction is completed. The compounds shown in the formula(I) and the formula (II) are as shown in the description, wherein R is chosen from phenyl, substituted phenyl, C1-C5 alkyl (preferably isopropyl) or thiophene. The synthesis method has the advantagesof being mild in reaction conditions, environment-friendly, simple in operation and capable to obtain polybrominated benzene oxazine compounds which cannot be obtained by conventional methods throughone pot multi-step reaction.

The invention belongs to preparation of nano composite materials, and the field of environmental governance, and discloses a preparation method of a carbon quantum dot CQDs hybridized CdIn2S4 composite material and a catalysis property of the carbon quantum dot CQDs hybridized CdIn2S4 composite material. The preparation method comprises the following steps: by taking carbon quantum dot CQDs and CdIn2S4 nanoparticles as raw materials, mixing the raw materials according to a certain ratio, and preparing a CdIn2S4 composite material nanoparticle composite photocatalyst which is hybridized with CQDs in different ratios by using a backflow method. The composite photocatalyst prepared by using the method can be used for degrading rhodamine B and an antibiotic levofloxacin in the presence of visible light. The material has the advantages that n the preparation method is simple, the cost is low, the energy consumption is small, the raw material is rich and clean, the reaction condition is gentle and the like; the carbon quantum dot CQDs hybridized CdIn2S4 composite photocatalyst is a good visible light response type composite photocatalyst, shows excellent photoproduction electron separation efficiency and excellent visible light catalysis activity, and has important application prospects in organic wastewater treatment.