Chiral pyridinone scaffolds widely exist in natural products and biologically active small molecules. Therefore, asymmetric catalytic synthesis with higher efficiency of these chiral compounds is of great importance, which has got significant improvement in this field recently.We reviewed the recent progress of asymmetric synthesis of dihydropyridinones through asymmetric cycloaddition reactions, compared the common points and differences between Aza⁃Diels⁃Alder reactions and [3 + 3] cycloadditions. The detailed catalytic mechanisms and advantages of these reactions were discussed, and the tendency of future development was also prospected.

In the grim situation of global water shortages and environmental pollution, it is necessary to find a clean way to obtain clean water. Solar energy is an inexhaustible, clean and pollution⁃free energy source. Its applications include photothermal, photovoltaic, photocatalytic oxidation, etc. Among them, photothermal is the most efficient way of energy conversion. Carbon material, as a material which has been paid attention to in recent years, has many advantages, such as convenient approach, low price and environmental friendliness.The carbon materials and composites with good photothermal effect which have been studied at home and abroad in recent years are reported, and some new research ideas and materials which can be used for photothermal conversion are also reported.

Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (ESIFTICRMS) coupled with Gas Chromatography Mass Spectrometry (GCMS) were used to analysize the composition of organic pollutants. Based on this, the comprehensive analysis method for heavy oil processing wastewater was established. The comprehensive analysis of biochemical process effluent demonstrated that refractory macromolecular polar organic pollutants and nonpolar alkanes were main components of organic load. The total number of polar organic pollutants was 376, and Ox, NxOx and SxOx were main classes which were presumed to be organic acids, esters and heterocyclic compounds. Most polar organic pollutants were unsaturated molecules with the structure of aromatic ring, polycyclic and heterocyclic. Ncontained heterocyclic compounds and nitrate contributed to highconcentration total nitrogen. COD degradation and nitrogen removal of biochemical process were improved, and advanced treatment of catalytic ozonation was also used which will benefit the heavy oil processing wastewater in order to meet discharge standards.

The copolymer of PAANa －co－PVP was prepared by copolymerization of acrylate and N －vinyl pyrrolidone，intiated with the NH_３· H_２ O／H_２O_２redoxy intiator．The structure of the copolymer was characterized via FTIR method．It is educed that the reactivity ratio of AANa（r_１） and NVP（r_２） is 3.296 and 0.808 respectively，by analyzing the reactivity ratio results calculated by mathematical methods of FR，KT and YBR， via the aid of the test results of element analysis．The extrinsic cytotoxicity of the copolymer was evaluated through the 3-4,5－dimethylthiazol －2－yl －2,5－diphenyltetrazolium bromide （MTT） reduction assay．It is found that the copolymer is biocompatible．

Two kinds of polymerizable vinyl quaternary ammonium salt, namely dimethyldiallyl ammonium chloride and trimethyldiallyl ammonium chloride respectively, were prepared via the SN ₂ nucleophilic substitution of the allyl chloride with the tertiary amine. The structure of the prepared quaternary ammonium salts were characterized through the methods of element analysis, FTIR, H ¹－NMR and C ¹³－NMR. Two kinds of polyampholytic superabsorbent polymer, which include CMCTS-g-(PAA-co-PDMDAAC) and CMCTS-g-(PAA-co-TMAAC) respectively, were prepared through graft copolymerization of prepared vinyl quaternary ammonium salt and acrylic acid onto the chain of carboxymethyl chitosan, initiated with persulfate and crosslinked properly. The structure of the superbasorbent polymer was characterized by FTIR. Influence of the pH value of the solution on the swelling ratio of the polyampholytic superabsorbent polymer was studied.