![]() The effects of EEFs were studied using the “Field = M ± N” keyword with F values (F=☐,125 au and ☐,080 au) along the preferred axis. All calculations were performed with Gaussian09 software, the compounds were fully optimized using the restricted Hartree-Fock method with the basis set 6-31G, single-point energies determined with MP3 method and basis set 6-31G. So, the goal of this study was to compare the activation energies of the Diels-Alder reaction between ethylene and nitrosoethylene, using an electric field, Lewis acid (BH 3 ) as catalysts and the influence of substituents. The existence of an external electric field (EEF), properly oriented, has the potential to further stabilize or destabilize these charge transfer contributors and thus influence the energy. However, there are other artifices to catalyze chemical reactions, in particular the Diels-Alder reactions, such as, for example, the application of an electric field on the reaction axis. Its PDF creator would be the main reason to use it.The substituents on the diene and/or dienophile can contribute to the decrease or increase of this energy. If you don't mind how slow it is when viewing large images then you should try it. If they improve the speed I'll definitely use it again. Nitro 3 was a great improvement in the past, but it hasn't had any upgrades while the pro version is at version 9. ![]() Other PDF viewers have improved and there are PDF tools available to edit PDFs, so Nitro hasn't become a real necessity. I really like Nitro, but the sluggish behavior has made me change to a new PDF viewer. But, recently I work with PDFs with large images and Nitro seems rather slow when opening them and turning to each page. It also can extract content, snapshot, notes & commenting, form filler, Quicksign, web restriction and java script disablement. It's strong point is that it has a great PDF creator in which you can customize the PDF the way you want to. I've used Nitro Reader for Years and was always the best one to me compared to others. ![]()
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