Aryl-containing polymer oxidative degradation method and application thereof

Abstract

The invention discloses an aryl-containing polymer oxidative degradation method and application thereof. According to the method, under the condition of heat energy and / or light energy and / or microwaves, in the absence of a solvent or in a solvent, in the presence of an oxidizing agent and / or an additive and under the catalysis of an iron compound, the benzyl position of the aryl-containing polymer is subjected to C-C bond breakage and selective oxidation, and the corresponding oxidized compound is obtained. The method disclosed by the invention can be directly used for selectively breaking and oxidizing a C-C bond at a benzyl position of an aromatic polymer, so that the degradation and recycling of aryl-containing polymer plastics and the design and application of novel degradable plastics are realized, and the method has important significance for solving the problem of plastic pollution; the method has the advantages of high efficiency, rapidness, mild oxidation conditions, direct use of air as an oxidant, safety, greenness, simple operation, no need of inert gas protection and no need of a large amount of high-valence metal salts; the substrate applicability is wide; and cheap metal is used for reaction, and the method has great application potential in the fields of metal catalysis, chemical synthesis and the like.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to an oxidative degradation method of an aromatic group-containing polymer and its application. Background technique [0002] C-C bond cleavage is an important means in chemical synthesis. The cleavage of C-C bonds usually requires noble metal catalysis, such as ruthenium, rhodium, palladium, etc., or use rigid rings as reactants, such as three-membered rings, four-membered rings, polycyclic compounds, or use carboxylic acid compounds for decarboxylation, alcohols Cleavage of the β bond of the compound achieves the cleavage of the C-C-bond. These methods all require the existence of some specific functional groups, and directly use hydrocarbon compounds to break the C-C bond. Since C(sp 3 )-C bonds have higher bond energy, are relatively stable, have poor reactivity, and are difficult to break C-C bonds. For the oxidation reaction of the benzylic C-C bond breaking of a...

AI Technical Summary

Problems solved by technology

The traditional method of synthesizing organic acids is through the oxidation of alcohols or aldehydes, but usually requires the use of some measured amounts of strong oxidants such as potassium permanganate and sodium hypochlorite, and will produce a large amount of inorganic salts and some other oxides after oxidation, which cannot be well Realize selective oxidation, and the pollution is serious

[0004] Plastics are widely used in daily life because their properties are easy to be regulated by structure. However, due to their high molecular structure, low solubility and slow natural degradation rate, the environmental pollution caused by plastics is becoming more and more serious.

As one of the most common plastics, polystyrene can be used to make various materials such as foam and rigid cups, but because the chemical bonds it contains are relatively inert, polystyrene is difficult to degrade

As a common method for the degradation of organic pollutants, the Fenton reaction can only degrade polystyrene after sulfonation treatment, and cannot effectively recycle the degradation products (Environ.Sci.Technol.2011, 45, 744–750)

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