{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T00:53:07Z","timestamp":1760143987705,"version":"build-2065373602"},"reference-count":104,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2022,6,11]],"date-time":"2022-06-11T00:00:00Z","timestamp":1654905600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Junta de Extremadura","award":["GR18010","IB16013","GR21032"],"award-info":[{"award-number":["GR18010","IB16013","GR21032"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>This paper is a detailed review of the chemistry of medium-size reactive systems using the following hydrogen abstraction reactions with ethane, X + C2H6 \u2192 HX + C2H5; X \u2261 H, F(2P), Cl(2P), O(3P) and OH, and focusing attention mainly on the theoretical developments. These bimolecular reactions range from exothermic to endothermic systems and from barrierless to high classical barriers of activation. Thus, the topography of the reactive systems changes from reaction to reaction with the presence or not of stabilized intermediate complexes in the entrance and exit channels. The review begins with some reflections on the inherent problems in the theory\/experiment comparison. When one compares kinetics or dynamics theoretical results with experimental measures, one is testing both the potential energy surface describing the nuclei motion and the kinetics or dynamics method used. Discrepancies in the comparison may be due to inaccuracies of the surface, limitations of the kinetics or dynamics methods, and experimental uncertainties that also cannot be ruled out. The paper continues with a detailed review of some bimolecular reactions with ethane, beginning with the reactions with hydrogen atoms. The reactions with halogens present a challenge owing to the presence of stabilized intermediate complexes in the entrance and exit channels and the influence of the spin-orbit states on reactivity. Reactions with O(3P) atoms lead to three surfaces, which is an additional difficulty in the theoretical study. Finally, the reactions with the hydroxyl radical correspond to a reactive system with ten atoms and twenty-four degrees of freedom. Throughout this review, different strategies in the development of analytical potential energy surfaces describing these bimolecular reactions have been critically analyzed, showing their advantages and limitations. These surfaces are fitted to a large number of ab initio calculations, and we found that a huge number of calculations leads to accurate surfaces, but this information does not guarantee that the kinetics and dynamics results match the experimental measurements.<\/jats:p>","DOI":"10.3390\/molecules27123773","type":"journal-article","created":{"date-parts":[[2022,6,12]],"date-time":"2022-06-12T22:37:20Z","timestamp":1655073440000},"page":"3773","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Current Status of the X + C2H6 [X \u2261 H, F(2P), Cl(2P), O(3P), OH] Hydrogen Abstraction Reactions: A Theoretical Review"],"prefix":"10.3390","volume":"27","author":[{"given":"Joaquin","family":"Espinosa-Garcia","sequence":"first","affiliation":[{"name":"Departamento de Qu\u00edmica F\u00edsica and Instituto de Computaci\u00f3n Cient\u00edfica Avanzada, Universidad de Extremadura, 06071 Badajoz, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0181-0622","authenticated-orcid":false,"given":"Cipriano","family":"Rangel","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica F\u00edsica and Instituto de Computaci\u00f3n Cient\u00edfica Avanzada, Universidad de Extremadura, 06071 Badajoz, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8463-3168","authenticated-orcid":false,"given":"Jose C.","family":"Corchado","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica F\u00edsica and Instituto de Computaci\u00f3n Cient\u00edfica Avanzada, Universidad de Extremadura, 06071 Badajoz, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,6,11]]},"reference":[{"key":"ref_1","first-page":"279","article-title":"On Simple Gas Reactions","volume":"B12","author":"Eyring","year":"1931","journal-title":"Z. 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