A novel ruthenium(Ⅱ)?catalyzed C-H/C-N annulation of 1?phenyl?2?pyrazolin?5?one with ethylene carbonate was designed. In this transformation, the vinylene carbonate acts as an ethynol or alkyne surrogate without any external oxidant as well as bases involved. The reaction exhibits a broad substrate scope with excellent functional group compatibility, affording a series of 1H?pyrazolo[1,2?a]cinnolin?1?ones in 42%~87% yields. A possible mechanism involving a sequential C-H activation/intramolecular C-N bond formation/ CO₂ or CO {}_{\mathrm{3}}^{\mathrm{2}-} elimination is proposed. In addition, the reaction can also be carried out on a gram scale with satisfactory yield.

In order to explore the microscopic mechanism of wax deposition on the pipe wall of high temperature and high?pressure condensate gas wells, this paper uses molecular dynamics simulation technology by the Materials Studio to build condensate oil system with methane, pentane, nonane,n?dodecane, cyclobutane, cyclopentane, benzene and toluene,and the wax component model was built with n?octadecane, and simulate with wax content, asphaltene and scale as variables. The results show that with the increase of wax and asphaltene mass fraction, the wall wax deposition behavior can be intensified, but when the asphalt mass fraction reaches 2.0%,the wall wax deposition behavior can be inhibited.The more kinds of heteroatoms in asphaltene,the more obvious the promotion effect.When there is scale on the pipe wall, sulfate scale has a great influence on wax deposition.The understanding of microscopic mechanism provides a scientific basis for the treatment of wax deposition on the pipe wall.

Mergers and acquisitions is an effective way to rapidly expand the scale of enterprises and achieve profit growth. This article selected the M&A events of China's media industry listed companies from 2016 to 2017 as a sample, and conducted an empirical analysis on the relationship between CEO tenure, internal control, and media industry M&A performance. The results show that the M&A performance of the media industry has a tendency to rise first and then decline after the M&A; CEO tenure is negatively correlated with the M&A performance of the media industry; under the premise that other conditions remain unchanged, the effectiveness of media industry corporate internal control will promote the improvement of M&A performance; perfect internal control can weaken the negative correlation between CEO tenure and M&A performance in media industry. Based on the above research conclusions, some suggestions were put forward to improve the M&A performance of enterprises in the media industry.