The construction of C-N bond is an important research field in modern organic synthesis. For C-N bond construction methods, the amination of olefins is the most efficient way which can synthesize multi⁃site products in one⁃step. With the development of photocatalytic redox reactions, some important breakthroughs have been made in the field of amination of alkenes. Using the photocatalytic redox reaction with visible light as a green energy source, the cheap olefin compounds can be catalyzed into biologically active amine compound intermediates. This type of reaction can be widely used in synthetic chemistry, material chemistry, medicine and other fields. Therefore, it is necessary to develop photocatalytic amination of olefins. The research progress over 5 years in five areas, including olefin amidation hydrogenation reaction, olefin amination hydrogenation reaction, olefin halogenation amination reaction, olefin amination alkoxylation reaction, and olefin amination alkylation reaction, is briefly summarized.

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.

Mannich inhibitor was synthesized using cinnamaldehyde, acetophenone and aniline as raw materials, Cyclodextrins as phase transfer catalyst, through condensation of aldehydes and ketones amine generate in the aqueousphase. Under corrosive conditions of refinerycrude oil distillationunit, the optimum polarization extrin amount 0.3% was determined by taking weight loss method and curve scyclod. Effect of the corrosion inhibition of the mannich alkali was investigated using the weight loss method, potentiodynamic polarization and electrochemical impedance spectroscopy .The results showed that the Mannich base was a mixed corrosion inhibitor mainly by restraining the anodic process, and the inhibition rate increased with increasing of Mannich base concentration. When the amount of inhibitor concentration was 0.2%, the inhibition rate reached 94.37%,and Mannich base can effectively inhibit corrosion of 20# steel in the HClH ₂SH ₂O system.

Simulated oilfield wastewater and seawater were used as corrosive mediums, corrosion tests of 20# carbon steel, aluminizing carbon steel and sherardized carbon steel were evaluated via static corrosion weight loss method. The impact factors containing concentration of Cl-,Ca2+，HCO-3 and temperature were investigated. The research results show that the corrosion resistance performance of sherardized carbon steel is superior to 20# carbon steel and aluminizing carbon steel in the corrosion mediums. 

The potential energy surface of the promising interstellar molecule PSiCP was calculated at the density functional theory and ab initio level. At the B3LYP/6-311G(d) level, eight isomers connected by ten transition states were located on the potential energy surface. At the QCISD level, three isomers cSiPCP 1，PSiCP 7 and SiCPP 8 possess considerable kinetic stability. The bonding nature and spectroscopic parameters were analyzed, which will be helpful for the future astrophysical detection and the synthesis in the laboratory.